RKI INSTRUMENTS GX-3R Pro Five Gas Monitor Confined Space Detector Instruction Manual

June 6, 2024
RKI INSTRUMENTS

RKI INSTRUMENTS GX-3R Pro Five Gas Monitor Confined Space Detector

Specifications

  • Model: GX-3R Pro (TIIS Version)
  • Part Number: PT0-165
  • Manufacturer: RKI Instruments, Inc.
  • Released: 10/16/23
  • Website: www.rkiinstruments.com

Product Description

Overview

The GX-3R Pro (TIIS Version) is a portable gas detector designed for detecting specific gases in the environment. It features various modes and functions to ensure accurate gas detection.

Instrument Description

The GX-3R Pro comes equipped with sensors, alarm LED, audible alarm port, Bluetooth connectivity, and a display for gas name reading, time, and buzzer volume. It is designed for ease of use\ and reliability in gas detection applications.

Product Usage Instructions

Chapter 1: Introduction

This chapter provides an introduction to the product and its applications. Familiarize yourself with the basic functions and features of the GX-3R Pro.

Chapter 2: Description

Learn about the components of the GX-3R Pro, including RP-3R, aspirator adapter, and IrDA cable. Understand how each part contributes to the overall functionality of the device.

Chapter 3: Measuring Mode

Start up the device and switch to measuring mode to detect specific gases in the environment. Follow the guidelines provided to ensure accurate readings and proper operation of the instrument.

Chapter 4: Display Mode

Explore the display mode to view gas readings, time, and other essential information. Familiarize yourself with the display layout and understand how to interpret the data displayed on the screen.

Chapter 5: User Mode and Calibration

Learn how to customize user settings and calibrate the device for optimal performance. Follow the calibration procedures outlined in this chapter to maintain accuracy in gas detection.

Chapter 6: Maintenance

Understand the maintenance requirements of the GX-3R Pro to ensure longevity and reliability. Regular maintenance tasks are essential for keeping the device in good working condition.

Chapter 7: Storage and Disposal

Properly store the GX-3R Pro when not in use to prevent damage and maintain its functionality. Follow the disposal guidelines provided to safely dispose of the device when necessary.

Chapter 8: General Parts List

Refer to the general parts list for information on available replacement parts and accessories for the GX-3R Pro. Ensure compatibility when replacing parts to maintain the device’s performance.

Frequently Asked Questions

  • Q: How do I register my GX-3R Pro?
  • Q: What should I do if the device shows an alarm?
    • A: If the device triggers an alarm, follow the safety instructions provided in the user manual, evacuate the area if necessary, and contact a qualified technician for assistance.

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PT0-165
GX-3R Pro (TIIS Version)
Operator’s Manual
Part Number: 71-0642 Revision: P1
Released: 10/16/23 RKI Instruments, Inc. www.rkiinstruments.com

WARNING
Read and understand this instruction manual before operating instrument. Improper use of the gas monitor could result in bodily harm or death. Maintenance of the gas monitor is essential for proper operation and correct readings. Bump test the instrument before each day’s use with a known concentration of each target gas. A bump test can be done in User Mode’s BUMP TEST item or by applying gas in Measuring Mode. The instrument does not need to be calibrated unless it does not pass the User Mode bump test or does not respond appropriately, as defined by the user, in Measuring Mode.
2 · GX-3R Pro (TIIS Version) Operator’s Manual

GX-3R Pro Quick Reference Guide GX-3R Pro Quick Reference Guide

Turn On
Press & Hold

Past Due Bump/CAL

To Bump / CAL

POWER MODE

&RQ¿UP 8VH AIR

Normal Operation
After brief warm-up period
Fresh Air
Press & Hold
Turn Off
Press & Hold

POWER MODE
AIR
POWER MODE

%803 &RQ¿UPDWLRQ +HDOWK&KHFN ,QGLFDWRU

Gas name reading

Time

Buzzer Volume
Bluetooth Battery ,QGLFDWRU

Audible Alarm Port

AIR

GX-3R Pro

POWER MODE

CCOO/H/H22SS LEELL OO2 2TOCXOIC2

Sensors

Alarm LED

Scan QR code for GX-3R Pro Manual
RKI Instruments, Inc. 33248 Central Ave, Union City, CA 94587 3KRQHZZZUNLLQVWUXPHQWVFRP
190523/1000

Statement of Quality and Conformance
RKI Instruments, Inc. certifies that this instrument has been tested, inspected, and calibrated by a qualified technician and was found to meet or exceed the manufacturer’s specifications per ISO 9001 Quality System.
Register your Product here: www.rkiinstruments.com/registration
RKI Instruments, Inc. · 33248 Central Avenue, Union City, CA 94587 Phone: 510-441-5656 · 800-754-5165 · Fax: 510-441-5650 www.rkiinstruments.com
GX-3R Pro (TIIS Version) Operator’s Manual · 3

WARNING: Understand manual before operating. Substitution of components may impair intrinsic safety. To prevent ignition of a hazardous atmosphere, batteries must only be changed or charged in an area known to be nonhazardous.
GX-3R Pro (TIIS Version) Operator’s Manual · 9

Chapter 1:

Introduction

Overview
This chapter briefly describes the GX-3R Pro gas monitor. This chapter also describes the GX-3R Pro Operator’s Manual (this document). Table 1 at the end of this chapter lists the specifications for the GX-3R Pro.
About the GX-3R Pro
Using an advanced detection system consisting of up to four gas sensors, the GX-3R Pro personal five-gas monitor detects the presence of combustible gas, oxygen (O2), carbon monoxide (CO), hydrogen sulfide (H2S), and CO2 or a super toxic gas simultaneously. This model displays measurement results on an LCD and issue gas alarms (via LED and buzzer) as needed. This model also wirelessly transmits measurement results to a host using Bluetooth. The GX-3R Pro’s compact size and easy-to-use design make it ideally suited for a wide range of applications, including sewage treatment plants, utility manholes, tunnels, hazardous waste sites, power stations, petrochemical refineries, mines, paper mills, drilling rigs, and fire fighting stations. The GX-3R Pro offers a full range of features, including:
· Simultaneous monitoring of one to five gases · Liquid crystal display (LCD) for complete and understandable information at a glance · Ultrabright alarm LEDs · Distinctive audible/vibrating alarms for dangerous gas conditions and audible alarms for
unit malfunction · Microprocessor control for reliability, ease of use, and advanced capabilities · Data logging functions · Alarm trend data · STEL, TWA, and over range alarms · Peak readings · Built-in time function · Lunch break feature · TIIS classified as intrinsically safe (see Table 1 on page 11)
WARNING: The Model GX-3R Pro detects oxygen deficiency, elevated levels of oxygen, combustible gases, carbon monoxide, and hydrogen sulfide, all of which can be dangerous or life threatening. When using the GX-3R Pro, you must follow the instructions and warnings in this manual to assure proper and safe operation of the unit and to minimize the risk of personal injury. Be sure to maintain and periodically calibrate the GX-3R Pro as described in this manual.

10 · Chapter 1: Introduction

GX-3R Pro (TIIS Version) Operator’s Manual

Specifications

Table 1: Standard Sensor Specifications

Combustible Gas,
Methane (CH4) Calibration Standard*

Oxygen (O2)

Hydrogen Sulfide (H2S)

Carbon Monoxide (CO)

Detection Range

0 – 100% LEL

0 – 40.0% volume 0 – 200.0 ppm

0 – 2000 ppm

Lower Detectable Limit (LDL)
Reading Increment

n/a 1% LEL

n/a 0.1% volume

0.5 ppm 0.1 ppm

3 ppm 1 ppm

Warning Setpoint

10% LEL

19.5% volume, decreasing

5.0 ppm

25 ppm

Alarm Setpoint

25% LEL

18.0% volume, decreasing

30.0 ppm

50 ppm

Alarm H Setpoint

50% LEL

23.5% volume, increasing

100.0 ppm

1200 ppm

STEL Setpoint

n/a

n/a

5.0 ppm

200 ppm

TWA Setpoint

n/a

n/a

1.0 ppm

25 ppm

  • The GX-3R Pro is also available set up for general hydrocarbons and calibrated to a combustible gas other than methane, such as isobutane. Consult RKI Instruments, Inc. for further information.

Table 2: IR Sensor Specifications

Detection Range
Lower Detectable Limit (LDL)
Reading Increment
Warning Setpoint
Alarm Setpoint
Alarm H Setpoint
STEL Setpoint
TWA Setpoint

Carbon Dioxide (CO2)

0 – 10.00% volume

0 – 10,000 ppm

0.05% volume

300 ppm

0.01% volume

20 ppm

0.50% volume

5,000 ppm

3.00% volume

5,000 ppm

3.00% volume

5,000 ppm

3.00% volume 0.50% volume

n/a 5,000 ppm

GX-3R Pro (TIIS Version) Operator’s Manual

Chapter 1: Introduction · 11

Detection Range and Service Range
Lower Detectable Limit (LDL)
Reading Increment
Warning Setpoint
Alarm Setpoint
Alarm H Setpoint
STEL Setpoint
TWA Setpoint

Table 3: EC Sensor Specifications

Ammonia (NH3)
0 – 400.0 ppm (parts per million)

Hydrogen Cyanide (HCN)
0 – 30.0 ppm (parts per million)

Nitrogen Dioxide (NO2)
0 – 20.00 ppm (parts per million)

4 ppm

1.0 ppm

0.30 ppm

0.5 ppm

0.1 ppm

0.05 ppm

25 ppm

5.0 ppm

2.00 ppm

35 ppm

10.0 ppm

4.00 ppm

300 ppm

30.0 ppm

20.00 ppm

35 ppm 25 ppm

10.0 ppm 4.7 ppm

1.00 ppm 0.50 ppm

Phosphine (PH3)
0 – 20.00 ppm (parts per million)
0.02 ppm

Sulfur Dioxide (SO2)
0 – 100.00 ppm (parts per million)
0.20 ppm

0.01 ppm

0.05 ppm

0.30 ppm

2.00 ppm

0.60 ppm

5.00 ppm

0.60 ppm

100.00 ppm

1.00 ppm 0.30 ppm

5.00 ppm 2.00 ppm

Table 4: GX-3R Pro Specifications

Sampling Method

Diffusion (the model does not have internal suction pumps)

Response Time T90 within 30 seconds

Display

Graphics LCD Display

Max. Distance for Bluetooth Connection

30 feet, unobstructed

Environmental Conditions

· 3000 meter maximum altitude · Operating pressure: 70 – 120 kPa (70 – 110 kPa for explosion proof) · Pollution degree 2 · IP 66/68

12 · Chapter 1: Introduction

GX-3R Pro (TIIS Version) Operator’s Manual

Operating Temperature & Humidity
Safety/ Regulatory List of Standards
Power Supply
Continuous Operating Hours @ 25 °C in Measuring Mode (Non-Alarm Operation)
Battery Charger Ratings
Case
Included Accessories

Table 4: GX-3R Pro Specifications
Continuous environment: -20°C to 50°C/Below 90% RH Temporary environment (up to 15 minutes): -40°C to 60°C/Below 95% RH Ambient temperature range (for charging): 0°C to 40°C
NOTE: The H2-compensated CO sensor may not effectively compensate for high levels of H2 if exposed to temperatures above 40°C for longer than 15 minutes. Under these conditions, it can appear to the instrument that the H2 concentration has exceeded 2000 ppm, the max concentration that can be compensated for, resulting in a CO reading higher than the actual CO level.
· TIIS: IIC T4 Ga

· JNIOSH-TR-46-1: 2015 · JNIOSH-TR-46-6: 2015

Alkaline battery pack with 2 AAA batteries (3.0 VDC, 250 mA) OR Lithium ion battery pack (3.7 VDC, 200 mA) · Maxell rechargeable battery model no. ICP463048XS
NOTE: The GX-3R Pro draws power from an integrated rechargeable Li-ion battery that is not user-replaceable.

Lithium Ion Battery Pack

· Standard 4 gas + super-toxic EC: 25 hours (23 hours with Bluetooth on) · Super-toxic EC only: 50 hours · Standard 4 gas + IR: 16 hours (15 hours with Bluetooth on) · IR only: 24 hours

Alkaline Battery Pack

· Standard 4 gas + super-toxic EC: 16 hours (14 hours with Bluetooth on) · Super-toxic EC only: 32 hours · Standard 4 gas + IR: 7 hours (6 hours with Bluetooth on) · IR only: 12 hours

Input: 100 – 240 VAC, 47 – 63 Hz, 2.4 A Output: 5.99 VDC, 2A max
WARNING: Do not charge the unit with a non-genuine charger.

High-impact Plastic, RF Shielded, Dust and Weather Proof (IP66/68)
WARNING: The enclosures shall be protected against exposure to hydraulic liquids, oil or grease.

· Belt clip · Alligator clip · Rubber boot · Wrist strap · Calibration cup · Single-unit charger (included with Li-ion versions only)

GX-3R Pro (TIIS Version) Operator’s Manual

Chapter 1: Introduction · 13

Table 4: GX-3R Pro Specifications

Other Accessories

· 12 VDC charger · Multi-unit charger · SDM-3R · RP-3R · Aspirator adapter · IrDA/USB Cable for connecting to a computer when using the Data Logger Management
Program (not needed if computer has an infrared port)

Dimensions and Weight

Lithium Ion Battery Pack Version Approximately 65(H) x 73(W) x 26(D) mm (2.6″H x 2.9″W x 1.0″D) Approximately 120 g (4.2 oz.)
Alkaline Battery Pack Version Approximately 65(H) x 73(W) x 34(D) mm (2.6″H x 2.9″W x 1.3″D) Approximately 140 g (4.9 oz.)

Instrument

00

No. A

0

000

0000

00

B

C

D

E

Serial Number Key

· A: Year of manufacture (0 to 9) · B: Month of manufacture (1 to 9 for Jan.-Sep.; XYZ for Oct., Nov., Dec.) · C: Manufacturing lot · D: Serial number · E: Factory codes

About this Manual
The GX-3R Pro Operator’s Manual uses the following conventions for notes, cautions, and warnings.
NOTE: Describes additional or critical information.

CAUTION: Describes potential damage to equipment.

WARNING: Describes potential danger that can result in injury or death.

14 · Chapter 1: Introduction

GX-3R Pro (TIIS Version) Operator’s Manual

Chapter 2:

Description

Overview
This chapter describes the GX-3R Pro instrument and its accessories.

Instrument Description

Alarm LEDs

LCD

Threaded Inserts

AIR

POWER MODE
GX-3R Pro

CO/H2S LEL O2 TOXIC

Charging Socket

Buzzer Opening

Front

Sensor Retainer

Back

Figure 1: Component Location

Bottom Cover

Case
The GX-3R Pro’s sturdy, high-impact plastic case is radio frequency (RF) resistant and is suitable for use in many environmental conditions, indoors and out. The case is dust proof and water resistant. A clear plastic window on the front of the case allows for LCD viewing. The black bottom cover, located on the bottom of the case, allows access to the filters and sensors. A sensor retainer and filter gasket help orient and retain the sensor and filters. Three threaded inserts on the back of the case allow for installation of an alligator clip or belt clip.
LCD
A digital LCD (liquid crystal display) is visible through a clear plastic window in the top case. The LCD simultaneously shows the gas reading for all installed sensors. The LCD also shows information for each of the GX-3R Pro’s operating modes.
WARNING: A thin protective film covers the display to prevent scratches during shipping. Remove this film before use. Leaving the film installed voids the intrinsically safe certification.

GX-3R Pro (TIIS Version) Operator’s Manual

Chapter 2: Description · 15

Control Buttons
Two control buttons, AIR and POWER MODE are located below the LCD.

Button

Function(s)

AIR POWER MODE

· turns on LCD backlight · resets alarm condition if LATCHING is set to ON in Maintenance
Mode · enters User Mode, Maintenance Mode, and Gas Select Mode when
used with POWER MODE button · activates the demand zero function (adjusts the GX-3R Pro’s fresh air
reading) · changes the value of a parameter available for adjustment · scrolls through parameter options
· turns the GX-3R Pro on and off · turns on LCD backlight · enters and scrolls through Display Mode · enters instructions into the GX-3R Pro’s microprocessor · resets alarm condition if LATCHING is set to ON in Maintenance
Mode · enters User Mode, Maintenance Mode, and Gas Select Mode when
used with AIR button

Alarm LEDs
Five sets of red alarm LEDs (light emitting diodes) around the edge of the case alert you to gas, low battery, and failure alarms.
Buzzer
One solid-state electronic buzzer is located inside the case. Sound exits the case through a hole in the middle front of the case. The buzzer sounds for gas alarms, malfunctions, low battery voltage, and as an indicator during use of the GX-3R Pro’s many display and adjustment options.
Vibrator
A vibrating motor inside the GX-3R Pro case vibrates for gas alarms, unit malfunctions, and as an indicator during normal use of the various modes of the GX-3R Pro.
NOTE: If STEALTH is set to ON, the vibrator only functions when VIBRATION in the STEALTH Gas Select Mode item is set to ON. See “Stealth and Vibrator Settings (STEALTH)” on page 193.

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GX-3R Pro (TIIS Version) Operator’s Manual

Sensors
The GX-3R Pro uses four sensors to monitor up to 5 gases simultaneously. The sensor retainer and bottom cover hold the sensors in place. The sensors use different detection methods, as described below.
Combustible Gas Sensor
The combustible gas sensor (NCR-6309) detects combustible gas in the % LEL range using 2 catalytic elements: a standard element and a poison-resistant element that is resistant to sensor poisons like silicone. The element’s resistance changes based on the reaction of gas with oxygen. The change in resistance affects the current flowing through the element. The GX-3R Pro’s circuitry amplifies the current, converts the current to a gas concentration, and displays the concentration on the LCD.
The standard calibration for the combustible gas sensor is to methane but the sensor will still detect and respond to a variety of combustible gases.
O2/CO/H2S/Super Toxic Sensors
The O2, CO, H2S, and super toxic sensors are electrochemical cells that consist of two precious metal electrodes in a dilute acid electrolyte. A gas permeable membrane covers the sensor face and allows gas to diffuse into the electrolyte. The gas reacts in the sensor and produces a current proportional to the concentration of the target gas. The GX-3R Pro’s circuitry amplifies the current, converts the current to a gas concentration, and displays the concentration on the LCD.
There are 4 different types of CO and H2S sensors available: · CO only (ESR- A13P-CO): A single electrochemical cell that detects CO.
· H2 compensated CO (ESR-A1CP-CO-H): A single electrochemical cell that detects CO. This sensor does not respond to or responds minimally to hydrogen (displays H2 RICH once H2 concentration reaches 2000 ppm).
NOTE: The H2-compensated CO sensor may not effectively compensate for high levels of H2 if exposed to temperatures above 40°C for longer than 15 minutes. Under these conditions, it can appear to the instrument that the H2 concentration has exceeded 2000 ppm, the max concentration that can be compensated for, resulting in a CO reading higher than the actual CO level.
· H2S only (ESR-A13i-H2S): A single electrochemical cell that detects H2S. · CO/H2S (ESR-A1DR-COHS): A combination electrochemical cell that detects both CO
and H2S.
IR Sensors
The infrared sensors detect CO2 in the ppm and % volume ranges. Gas enters the sensor through an opening on its face. Infrared light shines through the gas and into an infrared detector. The intensity of the infrared light changes with the gas concentration and this change is converted to an electrical signal. The GX-3R Pro’s circuitry converts the signal into a gas concentration and displays the gas concentration on the LCD.

GX-3R Pro (TIIS Version) Operator’s Manual

Chapter 2: Description · 17

Dummy Sensors
A dummy sensor is installed in any units that have less than 4 sensors. Dummy sensors are factory installed. The flat side of the dummy sensor faces away from the GX-3R Pro and the hollow side faces toward the GX-3R Pro.
Filters
Combustible Gas Sensor H2S Removal Filter Disk (Dark Red)
An H2S removal filter disk is placed into a recess in the filter gasket over the combustible gas sensor. The filter disk prolongs the life of the combustible gas sensor by preventing H2S in the ambient air from reaching the sensor. The H2S filter disk is dark red in color and although it may darken over time, its color is not indicative of remaining filter life.
The H2S filter disk needs replacing once it’s been exposed to 33 ppm hours of H2S. This means the filter needs replacing after 80 minutes of exposure to 25 ppm H2S which equates to 40 2minute calibrations with a cylinder containing 25 ppm H2S. If H2S exists in the monitoring environment, the H2S filter disk will have to be replaced more frequently.
CO/H2S Sensor Dual Filter (Black and White)
A dual filter is placed into a recess in the filter gasket over the dual CO/H2S sensor. The black half is a charcoal filter for the CO sensor. The white half is a humidity filter for the H2S sensor. Replace the filter if you notice:
· Unexplained CO readings.
· For users with a 1 ppm H2S alarm setpoint: A drift on the H2S zero reading, unexplained H2S readings, the filter appears dirty, or every 6 months (whichever is sooner).
CO Sensor Charcoal Filter (Black)
A black charcoal filter is placed into a recess in the filter gasket over the CO sensor. The charcoal filter disk scrubs H2S and certain hydrocarbons out of the sample to avoid false CO readings. If false or elevated CO readings are noticed, especially in the presence of H2S, change the charcoal filter.
H2S and PH3 Sensors’ Humidity Filter (White)
A white humidity filter is placed into a recess in the filter gasket over the H2S or PH3 sensor (if an H2S or PH3 sensor is installed). The filter absorbs humidity in the sampling environment to prevent unstable readings around 0 ppm. “H2S” and “PH3” are printed on the side of the filter.
· H2S: For users with a 1 ppm H2S alarm setpoint, the filter should be replaced every 6 months, if you notice a drift on the zero reading, or if the filter appears dirty (whichever is sooner). For users with a 2 ppm or higher H2S alarm setpoint, the filter does not necessarily ever need to be replaced.
· PH3: The filter should be replaced every 6 months.

18 · Chapter 2: Description

GX-3R Pro (TIIS Version) Operator’s Manual

NO2 and SO2 Sensors’ H2S Removal Filter Disk (Tan)
An H2S removal filter disk is placed into a recess in the filter gasket over the NO2 or SO2 sensor (if an NO2 or SO2 sensor is installed). The filter disk prolongs the life of the sensors by preventing H2S in the ambient air from reaching the sensor. The filter should be replaced every 6 months. “NO2” is printed on the side of the filter intended for use with NO2 sensors. “SO2” is printed on the side of the filter intended for use with SO2 sensors.
HCN Sensor’s H2S Removal Filter Disk (Dark Gray)
An H2S removal filter disk is placed into a recess in the filter gasket over the HCN sensor (if an HCN sensor is installed). The filter disk prolongs the life of the sensors by preventing H2S in the ambient air from reaching the sensor. The filter should be replaced every 6 months.
NH3 Sensor’s Humidity Filter (White)
A white humidity filter is placed into a recess in the filter gasket over the NH3 sensor (if an NH3 sensor is installed). The filter absorbs humidity in the sampling environment to prevent unstable readings around 0 ppm. The filter should be replaced every 6 months. “NH3” is printed on the side of the filter.
Hydrophobic Dust Filter
The oval-shaped hydrophobic dust filter is attached to the top of the filter gasket, covering the sensor ports and the filters. The filter gasket and hydrophobic dust filter get replaced as a set.
NOTE: Some GX-3R Pros have a hydrophobic dust filter that is not attached to the filter gasket. When replacing the hydrophobic dust filter on one of these GX-3R Pros, remove the filter and the gasket and replace it with a filter gasket/hydrophobic dust filter assembly.
Infrared Communications Port
An infrared (IR) communications port is located on the top of the case, near the top LEDs. Logged data transmits through the port in standard IrDA protocol. A computer’s infrared port or an IrDA/USB cable connected to a USB port can be used to download data to the GX-3R Data Logger Management Program. See the GX-3R Data Logger Management Program operator’s manual for data logging and downloading instructions.

GX-3R Pro (TIIS Version) Operator’s Manual

Chapter 2: Description · 19

Battery Pack
The GX-3R Pro is either powered by a rechargeable lithium-ion (Li-ion) battery pack or an alkaline battery pack with 2 AAA batteries (Toshiba LR03), both of which have integral components for maintaining intrinsic safety. Instruments with a Li-ion battery pack have a charging socket on the back of the instrument. Instruments with an alkaline battery pack have a cover that allows for battery replacement. The battery icon in the upper right of the LCD shows remaining battery life. A low battery warning activates when the GX-3R Pro detects a low battery voltage. The GX-3R Pro sounds a dead battery alarm when battery voltage is too low for Measuring Mode.
NOTE: Use of batteries or battery chargers not specified by RKI Instruments, Inc. will compromise the TIIS classification and may void the warranty. See page 118 and page 120 for more information.
WARNING: Do not charge batteries in a hazardous location. Do not charge the unit with a non-genuine charger.
Included Accessories
Belt Clip
A belt clip is already installed on the back of the GX-3R Pro to easily attach the instrument to a utility belt.
Belt Clip

Figure 2: Belt Clip

20 · Chapter 2: Description

GX-3R Pro (TIIS Version) Operator’s Manual

Alligator Clip
An alligator clip and three installation screws are included but not pre- installed on the GX-3R Pro. The alligator clip can be used to attach the GX-3R Pro to clothing or a belt. Teeth in the alligator clip’s jaws prevent the unit from slipping off. The alligator clip can be rotated to change the instrument’s orientation.

Figure 3: Alligator Clip
Rubber Boot
A black rubber boot is installed on the GX-3R Pro.
Wrist Strap
A wrist strap is included with the GX-3R Pro and can be attached to the wrist strap installation feature on the left side of the GX-3R Pro’s case.
Single-Unit AC Charger
The charging cable is a 4 foot cable with an AC adapter on one end and a charging plug that connects to the GX-3R Pro on the other end.

AC Adapter
Figure 4: Charging Cable

Charging Plug

GX-3R Pro (TIIS Version) Operator’s Manual

Chapter 2: Description · 21

Calibration Cup
Use the calibration cup to apply gas during a bump test, calibration, or gas test. The calibration cup has an installation orientation to observe. “Front” and “rear” imprinting on the bottom of the cup correspond to the front and rear of the GX-3R Pro when the calibration cup is installed. In addition, a “front” label on the front of the calibration cup should be visible when viewing the LCD with the calibration cup installed.
FRONT
Figure 5: Calibration Cup
Other Accessories
12 VDC Charger
The 12 VDC charger is a 4 foot cable with a vehicle plug on one end and a plug that connects to the GX-3R’s power jack on the other end.
Multi-Unit Charger
The multi-unit charger is a 4 foot wall plug style adapter that plugs into a bar. The bar has five 2foot cables coming out one side. The end of each of the five cables has a plug that connects to the GX-3R Pro’s power jack. The AC adapter is rated 100 – 240 VAC input, 5.99 VDC output.
SDM-3R
The SDM-3R is a calibration station for the GX-3R and GX-3R Pro. The station’s buttons can be used for operations (Standalone Mode) or a computer can be used to control the docking station (PC Controlled Mode). See the appropriate SDM- 3R manual for more information.

22 · Chapter 2: Description

GX-3R Pro (TIIS Version) Operator’s Manual

RP-3R
The RP-3R is a pump that draws sample to the GX-3R Pro. See the RP-3R manual for more information.
Aspirator Adapter
The aspirator adapter is a squeeze-bulb assembly that draws sample to the GX- 3R Pro.
IrDA Cable
Unless your computer has a built-in IrDA port, an IrDA cable is needed to establish communication between the GX-3R Pro and the Datalogging Program.

GX-3R Pro (TIIS Version) Operator’s Manual

Chapter 2: Description · 23

Chapter 3:

Operation

Overview
This chapter explains how to perform confined space entry monitoring or general area monitoring in the GX-3R Pro’s Measuring Mode.

Start Up
This section explains how to start up the GX-3R Pro, get it ready for operation, and turn it off.
WARNING: A thin protective film covers the display to prevent scratches during shipping. Remove this film before use. Leaving the film installed voids the intrinsically safe certification.

NOTE: The screens illustrated in this section are for a 4-gas + 0 – 10.00% volume CO2 unit. The screens displayed by your GX-3R Pro may be slightly different.

Turning On the GX-3R Pro
To illustrate certain functions, the following description of the GX-3R Pro start up sequence assumes that the following menu items are turned on: LUNCH BREAK, CAL REMINDER, and BUMP REMINDER in User Mode, and ID DISPLAY and AUTO ZERO in Maintenance Mode. If any of these items are turned off, then the corresponding screens will not appear.

1. Press and briefly hold down POWER MODE. Confirm that the LCD turns on, the LEDs flash, the buzzer sounds, and the motor vibrates before continuing with operation. Release the POWER MODE button when you hear a beep.

2. If LUNCH BREAK is set to ON (factory setting is OFF, see page 105), the Lunch Break Screen appears. The unit counts down from 5 seconds.

7:49

7:49

5 SEC NO :AIR LUNCH BREAK

5 SEC YES :MODE LUNCH BREAK

a. Continue Accumulating: To continue accumulating peak and time-weighted average (TWA) readings from the last time the GX-3R Pro was used, press and release POWER MODE or allow the countdown to reach 0. The short-term exposure limit (STEL) reading is reset each time the GX-3R Pro is turned on.
b. Reset Accumulation: To reset the accumulation of peak and time-weighted average (TWA) readings, press and release AIR before the countdown reaches 0.

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3. If CAL REMINDER is set to ON (factory setting) and a calibration is due, the screen that appears next depends on how CAL EXPIRED is set in User Mode (see page 91). The three possible screens are described below. If a calibration is not due, the instrument displays the number of days left until a calibration is due.

CAL EXPIRED set to CONFIRM TO USE (factory setting)

CAL EXPIRED set to CANNOT USE

CAL EXPIRED set to NO EFFECT

LCD
7:49
CONFIRM TO USE USER MODE:MODE
NO :AIR CAL DATE PAST

7:49
CANNOT USE USER MODE:MODE
CAL DATE PAST

7:49
NO EFFECT USER MODE:MODE
CAL DATE PAST

Sound Buzzer sounds double pulsing tone Buzzer sounds double pulsing tone None

Action

· Option A, Perform calibration: Press and release POWER MODE to perform a calibration. The instrument takes you straight to the AUTO CAL CYLINDER A screen in User Mode’s GAS CALAUTO CAL item. If Password Protection is set to On using the SDM-3R PC program, you must enter a password. See page 75 for calibration instructions.
If the calibration is successful, the screen above will not appear again until the unit is due for calibration. If the calibration is not successful, the screen above will again appear in the startup sequence.
· Option B, Bypass message: To continue without performing a calibration, press and release AIR.

The GX-3R Pro cannot be used until a successful calibration is performed. Press and release POWER MODE to perform a calibration. The instrument takes you straight to the AUTO CAL CYLINDER A screen in User Mode’s GAS CALAUTO CAL item. If Password Protection is set to On using the SDM-3R PC program, you must enter a password. If you don’t press POWER MODE, the instrument automatically goes to the AUTO CAL CYLINDER A screen after 6 seconds. If Password Protection is set to On using the SDM-3R PC program, you must enter a password. See page 75 for calibration instructions.
If the calibration is successful, the screen above will not appear again until the unit is due for calibration. If the calibration is not successful, the screen above will again appear in the startup sequence.

· Option A, Perform calibration: To perform a calibration, press and release POWER MODE. The instrument takes you straight to the AUTO CAL CYLINDER A screen in User Mode’s GAS CALAUTO CAL item. If Password Protection is set to On using the SDM-3R PC program, you must enter a password.
· Option B, Bypass message: To continue without performing a calibration, wait a few seconds for the instrument to continue with its startup sequence.

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4. If BUMP REMINDER is set to ON (factory setting is OFF) and a bump test is due, the screen that appears next depends on how BUMP EXPIRED is set in User Mode (see page 97). The three possible screens are described below. If a bump test is not due, the instrument displays the number of days left until a bump test is due.

BUMP EXPIRED set to CONFIRM TO USE (factory setting)

BUMP EXPIRED set to CANNOT USE

BUMP EXPIRED set to NO EFFECT

LCD
7:49
CONFIRM TO USE USER MODE:MODE
NO :AIR BUMP DATE PAST

7:49
CANNOT USE USER MODE:MODE
BUMP DATE PAST

7:49
NO EFFECT USER MODE:MODE
BUMP DATE PAST

Sound Buzzer sounds double pulsing tone Buzzer sounds double pulsing tone None

Action

· Option A, Perform bump test: Press and release POWER MODE to perform a bump test. The instrument takes you straight to the BUMP TEST CYLINDER A screen in the BUMP TEST User Mode item. If Password Protection is set to On using the SDM-3R PC program, you must enter a password. See page 68 for bump test instructions.
If the bump test is successful, the screen above will not appear again until the unit is due for bump testing. If the bump test is not successful, the screen above will again appear in the startup sequence.
· Option B, Bypass message: To continue without performing a bump test, press and release AIR.

The GX-3R Pro cannot be used until a successful bump test is performed. Press and release POWER MODE to perform a bump test. The instrument takes you straight to the BUMP TEST CYLINDER A screen in the BUMP TEST User Mode item. If Password Protection is set to On using the SDM-3R PC program, you must enter a password. If you don’t press POWER MODE, the instrument automatically goes to the BUMP TEST CYLINDER A screen after 6 seconds. If Password Protection is set to On using the SDM-3R PC program, you must enter a password. See page 68 for bump test instructions.
If the bump test is successful, the screen above will not appear again until the unit is due for bump testing. If the bump test is not successful, the screen above will again appear in the startup sequence.

· Option A, Perform bump test: To perform a bump test, press and release POWER MODE. The instrument takes you straight to the BUMP TEST CYLINDER A screen in the BUMP TEST User Mode item. If Password Protection is set to On using the SDM-3R PC program, you must enter a password.
· Option B, Bypass message: To continue without performing a bump test, wait a few seconds for the instrument to continue with its startup sequence.

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5. The Date/Time Screen appears for a few seconds.
7:49
MM/DD/YYYY 1/14/2019 7:49
DATE
6. The Battery Voltage Screen appears for a few seconds. The battery voltage is on the top line. The alarm latching/self-resetting setting is on the second line (see page 178 for a description of how to change this setting). The battery pack type is on the bottom line.
7:49
3.7V LATCHING
Li-ion
7. The combustible gas sensor actually contains 2 separate sensors: a standard catalytic sensor and a backup, poison-resistant sensor that is resistant to sensor poisons like silicone. An HC Gas List alarm indicates that the standard sensor has a reduced output, possibly due to one or more sensor poisons in the environment, and that the poison-resistant sensor is being used to provide gas readings. The poison-resistant sensor has a limited list of detectable gases. The table shown on page 48 shows which gases can and cannot be detected after receiving an HC Gas List alarm. If your application requires detection of a gas still detectable after an HC Gas List condition (like methane or isobutane), there is no need to replace the combustible gas sensor. However, if your application requires detection of a gas not detectable after an HC Gas List condition (like methanol or ethanol), you must replace the combustible gas sensor as soon as possible. Press and release POWER MODE to confirm the limited gas list and continue to Measuring Mode.
7:49
READ GAS LIST IN MANUAL

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Chapter 3: Operation · 27

8. The following screens display for 3 seconds each: the Gas Name Screen, the Full Scale Screen, the Warning Setpoint Screen, the Alarm Setpoint Screen, the Alarm H Setpoint Screen, the STEL Alarm Screen, and the TWA Alarm Screen.
NOTE: If the combustible gas is set to something other than CH4 or H2 in Gas Select Mode, the combustible channel is displayed as “HC” and the gas formula for the combustible gas sensor’s target gas appears during startup.

CH4 %LEL CO
CH4

7:49
ppm H2S ppm
CO H2S

O2

%

O2

CO2

vol%

CO2

GAS NAME

7:49

CH4 %LEL CO

ppm H2S ppm

100 2000 200.0

O2

%

40.0

CO2

vol%

10.00

FULL SCALE

7:49

CH4 %LEL CO

ppm H2S ppm

10 25 5.0

O2

%

19.5

CO2

vol%

0.50

WARNING

7:49

CH4 %LEL CO

ppm H2S ppm

25 50 30.0

O2

%

18.0

CO2

vol%

3.00

ALARM

7:49

CH4 %LEL CO

ppm H2S ppm

50 1200 100.0

O2

%

23.5

CO2

vol%

3.00

ALARM H

7:49

CO

ppm H2S ppm

200 5.0

CO2

vol%

3.00

STEL

7:49

CO

ppm H2S ppm

25 1.0

CO2

vol%

0.50

TWA

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9. If ID DISPLAY is set to ON (factory setting is OFF, see page 179), the User ID Screen appears for a few seconds, followed by the Station ID Screen.

7:49
USERID 001

7:49
STATION_ ID_001

USER ID

STATION ID

10. If the GX-3R Pro experiences a sensor failure during start up, the display shows which sensor failed and the buzzer sounds a double pulsing tone once per second. In the example below, the combustible gas sensor failed.
7:49
CH4 %LEL
FAIL

FAIL SENSOR
Press and release POWER MODE to acknowledge the failure and continue. “- – – -” replaces the failed sensor’s gas reading. Replace the failed sensor as soon as possible.
11. If AUTOZERO is set to ON (factory setting is OFF, see page 179), the instrument prompts you to do an auto zero.
7:49
YES : MODE NO : AIR AUTO ZERO
WARNING: Make sure that the instrument is in a known fresh air environment (an environment free of combustible or toxic gases and of normal oxygen content, 20.9%) before performing an auto zero operation. If you perform an auto zero operation in an area with gases present, the adjustment will not be accurate.
a. An auto zero operation sets the combustible gas, H2S, CO, and super toxic channels to 0 and the OXY channel to 20.9%.
b. If the instrument has a CO2 sensor installed and if CO2AIR SETTING is set to ON in User Mode, the CO2 channel gets set to 400 ppm (0.04% volume) during an auto zero. If CO2AIR SETTING is set to OFF in User Mode, the CO2 channel is not adjusted during the auto zero.
c. You must press and release POWER MODE to perform an auto zero function. If you do not press any key, after 15 seconds, the instrument enters Measuring Mode without performing an auto zero.

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d. If Password Protection is turned On (factory setting is Off) using the SDM- 3R PC program, a user-set password is required to perform an auto zero. When the password screen appears, adjust each digit with the AIR button and press and release the POWER MODE button to move on to the next digit. Once the password is entered, the instrument performs the auto zero.
7:49

0000

PASSWORD

12. At the end of the 45 second warmup, the GX-3R Pro begins monitoring for gas in Measuring Mode. The Measuring Mode Screen displays the current gas reading for each target gas.

CH4 %LEL CO
0

O2

%

20.9

7:49
ppm H2S ppm
0 0.0

CO2

vol%

0.00

Performing a Demand Zero
Perform a demand zero before using the GX-3R Pro. A demand zero operation sets the combustible gas, H2S, CO, and super toxic channels to zero and the OXY channel to 20.9%. If the instrument has a CO2 sensor installed and if CO2AIR SETTING is set to ON in User Mode, the CO2 channel gets set to 400 ppm (0.04% volume). If CO2AIR SETTING is set to OFF in User Mode, the CO2 channel is not adjusted during the demand zero. 1. Find a fresh-air environment. This is an environment free of toxic or combustible gases and of
normal oxygen content (20.9%).
2. Turn on the unit as described above in Turning On the GX-3R Pro.
3. Press and hold AIR. The LCD prompts you to continue holding AIR and the buzzer pulses while you hold the button (if KEY TONE is set to ON in User Mode).
4. Continue to hold AIR until the LCD prompts you to release it. The GX-3R Pro sets the fresh air readings for all channels. Start up is complete and the unit is now ready for monitoring.

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5. If Password Protection is turned On (factory setting is Off) using the SDM-3R PC program, a user-set password is required to perform a demand zero. When the password screen appears, adjust each digit with the AIR button and press and release the POWER MODE button to move on to the next digit. Once the password is entered, the instrument performs the demand zero.
7:49
0000
PASSWORD
Turning Off the GX-3R Pro
1. Press and hold POWER MODE. 2. TURN OFF appears on the display and the buzzer pulses for about five seconds (if KEY
TONE is set to ON in User Mode). 3. Release the button when TURN OFF disappears from the display. 4. If Password Protection is turned On (factory setting is Off) using the SDM-3R PC program,
a user-set password is required to turn off the GX-3R Pro. When the password screen appears, adjust each digit with the AIR button and press and release the POWER MODE button to move on to the next digit. Once the password is entered, the instrument shuts off.
7:49
0000
PASSWORD
5. If you plan to leave the instrument off for an extended period of time, see page 134.

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Chapter 3: Operation · 31

Measuring Mode Operation

When the GX-3R Pro completes its startup sequence, it is in Measuring Mode. In Measuring Mode the GX-3R Pro continuously monitors the sampled atmosphere and displays the target gas concentrations. The GX-3R Pro is considered to be in Normal Operation if there are no alarm indications.

S
CH4 %LEL CO
0

O2

%

20.9

7:49
ppm H2S ppm
0 0.0

CO2

vol%

0.00

Heart Symbol: The heart symbol in the upper left corner of the LCD indicates the operation status and blinks when normal. A microprocessor error causes the heart symbol to stop flashing or to disappear.
Check Mark: If BUMP REMINDER is set to ON and if a bump test is not due, a check mark appears in the upper left corner of the LCD.
“S”: If the instrument is operating in Stealth Mode, an “S” appears at the top of the LCD.
Buzzer Icon: The buzzer icon indicates the buzzer volume. Lines in front of the icon indicate a high buzzer volume. No lines in front of the icon indicates a low buzzer volume.
Bluetooth Icon: The Bluetooth icon flashes when the instrument is trying to pair to a phone. The Bluetooth icon is steadily on when the instrument is paired to a phone. The Bluetooth icon is off when the instrument is not paired and is not trying to pair to a phone.
Backlight: In a low-light environment, press and release either button to turn on the display backlight. See page 108 to set the backlight time.
Confirmation/Non-Compliance Indicator: If the BEEP menu item in User Mode is set to anything other than OFF, the GX-3R Pro gives periodic indications to confirm that it’s operating or to indicate a non-compliance (see page 106 for instructions).

Monitoring an Area

1. Start up the GX-3R Pro as described above in “Start Up” on page 24. It is now in Measuring Mode.

CH4 %LEL CO
0

O2

%

20.9

7:49
ppm H2S ppm
0 0.0

CO2

vol%

0.00

2. Take the GX-3R Pro to the monitoring area.
3. Wait at least 15 seconds and observe the display for gas readings. If a reading is observed, allow the reading to stabilize to determine the gas concentration(s) present. If you are sampling with an aspirator adapter, see page 36.

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4. If a gas alarm occurs, take appropriate action. See page 40.
5. Do not expose the GX-3R Pro to rain.
6. The GX-3R Pro’s IP 66/68 ratings do not imply that the GX-3R Pro will detect gas during and after exposure to those conditions. If exposure occurs, dry the instrument with a cloth and perform a bump test as described on page 68.
7. If the GX-3R Pro gets exposed to flammable liquids: a. Wipe the instrument off with a cloth dampened with water. b. Replace the filters as described on page 122 and page 125 if they became saturated c. Perform a bump test as described on page 68.
8. If you suspect that the GX-3R Pro is not operating correctly: a. Take the GX-3R Pro to a fresh air environment and perform a demand zero as described on page 29. b. Perform a bump test as described on page 68.

Combustible Gas Detection
There are three issues to keep in mind when monitoring for combustible gas.
Response
The combustible gas sensor responds to any combustible gas. The standard calibrated target gas for the combustible gas channel is methane (CH4). If the instrument is setup for and calibrated to a different combustible gas, such as hexane or propane, the gas name right above the readings displays as “HC”.

· Automatic Conversion
The GX-3R Pro can automatically display converted target gas readings if the instrument’s calibrated target gas is methane or isobutane. See “Combustible Sensor Target Gas Conversion (HC GAS LIST)” on page 48.

· Manual Conversion
You can manually calculate a converted target gas reading using table below if the instrument’s calibrated target gas is methane. The table below lists the conversion factors for several hydrocarbon gases if the GX-3R Pro is calibrated to methane.
To use this table, multiply the display reading on the combustible gas channel by the factor in the appropriate row to obtain the actual gas concentration. For example, if you are detecting ethylene and the display reads 10% LEL for the combustible gas channel, you actually have 10% LEL x 0.83 = 8.3% LEL ethylene present.
Table 5: LEL Hydrocarbon Conversion Factors

LEL Conversion Factor

LEL Conversion Factor

Gas

(from CH4 Cal.)

Gas

(from CH4 Cal.)

Acetone

2.22

IPA

1.64

Acetylene

1.43

Isobutane

1.10

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Chapter 3: Operation · 33

Table 5: LEL Hydrocarbon Conversion Factors

Gas Benzene

LEL Conversion Factor (from CH4 Cal.)
2.50

Gas MEK

LEL Conversion Factor (from CH4 Cal.)
2.63

Butadiene

1.52

Methane

1.00

Cyclopentane 1.45

Methanol

1.82

DME

1.16

MIBK

4.00

Ethane

0.94

MMA

3.33

Ethanol

1.96

Nonane

9.09

Ethyl Acetate 2.86

Propane

1.12

Ethylene

0.83

Propylene

0.97

Heptane

3.13

THF

2.33

Hexane

1.89

Toluene

4.55

Hydrogen

0.95

Xylene

7.69

Overscale Protection
The GX-3R Pro protects the combustible gas sensor by temporarily turning off the sensor power if levels exceeding 100% LEL are detected. Nevertheless, combustible gas concentrations above 100% LEL can still affect the zero level or calibration of the combustible gas sensor.

CAUTION: Do not expose the combustible gas sensor to high concentrations of combustible gas such as that from a butane lighter. Exposure to high concentrations of combustible gas may adversely affect the performance of the sensor.

CAUTION: Any rapid increase in the combustible gas reading on the combustible gas channel followed by a declining or erratic reading may indicate a gas concentration above the LEL which may be hazardous.
Damaging Gases
Some gases such as silicone vapors, chlorinated hydrocarbons, and sulphur compounds can contaminate the sensor’s detection elements. This causes sensor damage and/or a reduced response to combustible gas. Make every effort to avoid these gases. The H2S scrubber disks protect the combustible sensor from H2S, but you should avoid other sulphur compounds.

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HC Gas List Alarm
An HC Gas List alarm can occur at startup or after a calibration. The combustible gas sensor actually contains 2 separate sensors: a standard catalytic sensor and a backup, poison-resistant sensor that is resistant to sensor poisons like silicone. An HC Gas List alarm indicates that the standard sensor has a reduced output, possibly due to one or more sensor poisons in the environment, and that the poison-resistant sensor is being used to provide gas readings. The poison-resistant sensor has a limited list of detectable gases. The table shown on page 48 shows which gases can and cannot be detected after receiving an HC Gas List alarm. If your application requires detection of a gas still detectable after an HC Gas List condition (like methane or isobutane), there is no need to replace the combustible gas sensor. However, if your application requires detection of a gas not detectable after an HC Gas List condition (like methanol or ethanol), you must replace the combustible gas sensor as soon as possible.
Oxygen-Enriched Atmospheres
The GX-3R Pro is not intended for use in oxygen-enriched atmospheres.
WARNING: Do not use the GX-3R Pro in an environment whose oxygen concentration is above 21% .
H2-Compensated CO Detection
· GX-3R displays CO readings. · H2 reading is not displayed but “H2 RICH” appears once the H2 concentration rises above
2000 ppm.
NOTE: The H2-compensated CO sensor may not effectively compensate for high levels of H2 if exposed to temperatures above 40°C for longer than 15 minutes. Under these conditions, it can appear to the instrument that the H2 concentration has exceeded 2000 ppm, the max concentration that can be compensated for, resulting in a CO reading higher than the actual CO level.
Interference Information
Some gases interfere with CO, H2S, and super toxic sensors. For a complete list of these gases, see page 200.

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Chapter 3: Operation · 35

CO2 Detection
· A background level of CO2 exists in fresh air. table 6 below indicates a typical gas reading in fresh air.

Table 6: Carbon Dioxide Fresh Air Readings

Sensor Range

Approximate Fresh Air Reading

0 – 10.00% volume 0.04% volume

0 – 10,000 ppm

400 ppm

· Performing a demand zero, an auto zero, or an AIR CAL will either set to CO2 channel to 400 ppm (0.04% volume) or exclude the CO2 channel based on the setting of the CO2AIR SETTING User Mode parameter. See page 112 for more information.

Aspirator Adapter Sampling
The aspirator adapter accessory is used when it is necessary to draw sample from an area that cannot be entered or that must be checked for safety before entry, such as a tank or confined space.

CO/H2S LEL O2 TOXIC
FRONT

POWER MODE GX-3R Pro

AIR

Sample Cup

Aspirator Bulb Hose
Probe

Figure 6: GX-3R Pro Aspirator Adapter 1. Turn on the GX-3R Pro as described on page 24.

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2. Attach the sample cup to the GX-3R Pro. Use the label and imprinting to make sure that the sample cup gets installed in the correct orientation relative to the GX-3R Pro. Be sure the sample cup is pushed on all the way.
3. Screw the probe onto the threaded end of the hose. 4. Attached the hose and probe to the aspirator bulb. 5. Insert the end of the probe into the area to be sampled. 6. Squeeze and release the aspirator bulb 15 times. 7. Monitor the readings and note if any alarms occur. The readings will peak shortly after the last
squeeze and may decrease before all the channels can be checked. Use the Peak screen in Display Mode to see the maximum readings for each channel (see page 49).
NOTE: The peak readings for each channel are saved until a higher peak is recorded, the peak readings are reset, or the instrument is turned off. If a gas is present but the level does not exceed the previous peak level, the previous peak will be displayed on the Peak Screen.
Alarms
This section covers alarm indications in Measuring Mode. It also describes responding to and resetting an alarm condition.
NOTE: False alarms may be caused by radio frequency (RF) or electromagnetic (EMI) interference. Keep the GX-3R Pro away from RF and EMI sources such as radio transmitters or large motors.
Alarm Indications
The GX-3R Pro buzzer sounds an alarm, the LEDs flash, and the vibrator pulses when any sort of alarm condition or failure occurs. If the GX-3R Pro is operating in Stealth Mode, the buzzer does not sound and the vibrator’s operation depends on the VIBRATION setting in Gas Select Mode’s STEALTH menu item. See page 193 for more information.
NOTE: If an alarm condition occurs while you are in Display Mode, the GX-3R Pro automatically returns to the Measuring Mode screen.
The table below summarizes the GX-3R Pro’s alarm types and indications.

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Chapter 3: Operation · 37

None of the Man Down alarm indications occur if MAN DOWN is set to OFF (factory setting) in User Mode. The Panic alarm does not occur if PANIC is set to OFF (factory setting) in User Mode.

Alarm Type

Visual Indications

Other Indications

Warning
Concentration of gas rises above the Warning setting or falls below the Warning setting for O2.

· Affected channel’s gas reading flashes and the units field alternates between the units and AL1
· Alarm LEDs flash in circle sequence once per second
· Backlight turns on

Alarm
Concentration of gas rises above the Alarm setting or falls below the Alarm setting for O2.

· Affected channel’s gas reading flashes and the units field alternates between the units and AL2
· Alarm LEDs flash in circle sequence twice per second
· Backlight turns on

Alarm H Concentration of gas rises above the Alarm H setting.

· Affected channel’s gas reading flashes and the units field alternates between the units and AL3
· Alarm LEDs flash in circle sequence twice per second
· Backlight turns on

TWA or STEL
Concentration of CO, H2S, CO2, or super toxic gas rises above the TWA or STEL alarm setting.

· Affected channel’s gas reading flashes and the units field alternates between the units and TWA or STEL.
· Alarm LEDs flash in circle sequence once per second
· Backlight turns on

H2 RICH (for GX-3R Pros with H2compensated CO sensor)
Concentration of hydrogen rises above 2000 ppm (parts per million).

· H2 and RICH alternate in the lower right corner
· Alarm LEDs flash twice per second
· Backlight turns on

· High-low tone sounding once per second
· Vibrator pulses once per second
· High-low tone sounding twice per second
· Vibrator pulses twice per second
· High-low tone sounding twice per second
· Vibrator pulses twice per second
· High-low tone sounding once per second
· Vibrator pulses once per second
· High-low tone sounding twice per second
· Vibrator pulses twice per second

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Alarm Type
Over Range
Minus Over Range
Low Battery Warning Dead Battery Alarm Sensor Failure
HC Gas List Clock Failure System Failure

Visual Indications

Other Indications

· Affected channel’s gas reading is replaced by flashing OVER and the units field alternates between the units and OVER.
· Alarm LEDs flash in circle sequence twice per second
· Backlight turns on

· High-low tone sounding twice per second
· Vibrator pulses twice per second

· Affected channel’s gas reading is replaced by flashing -OVER and the units field alternates between the units and MOVER.
· Alarm LEDs flash in circle sequence twice per second
· Backlight turns on

· High-low tone sounding twice per second
· Vibrator pulses twice per second

· The last bar in the battery icon starts flashing

None

· Gas readings disappear and FAIL BATTERY appears at the bottom of the LCD
· Alarm LEDs flash once per second

Double pulsing tone once per second

· FAIL SENSOR appears at the bottom of the LCD and the failed sensor(s) are indicated with FAIL under the gas name.
· Alarm LEDs flash once per second

Double pulsing tone once per second

· READ GAS LIST IN MANUAL appears on the screen.
· Alarm LEDs flash once per second

Double pulsing tone once per second

· FAIL CLOCK appears at the bottom of the LCD
· Alarm LEDs flash once per second

Double pulsing tone once per second

· FAIL SYSTEM appears at the bottom of the LCD and an error code displays in the middle of the LCD
· Alarm LEDs flash once per second

Double pulsing tone once per second

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Chapter 3: Operation · 39

Alarm Type

Visual Indications

Man Down Warning 1
The WARNING 1 TIME defined in User Mode has passed since the instrument detected movement.

· Alarm LEDs flash once per second

Man Down Warning 2
The WARNING 2 TIME defined in User Mode has passed since the instrument detected movement.

· Alarm LEDs flash twice per second

Man Down Alarm
The ALARM TIME defined in User Mode has passed since the instrument detected movement.

· MAN DOWN appears at the bottom of the LCD and the gas readings disappear
· Alarm LEDs flash in circle sequence twice per second
· Backlight turns on

Panic
User double taps the instrument.

Pre Alarm

· Screen unaffected for 5 seconds
· Alarm LEDs flash twice per second

Main Alarm

· PANIC appears at the bottom of the LCD and the gas readings disappear
· Alarm LEDs flash in circle sequence twice per second
· Backlight turns on

Other Indications
Single pulsing tone once per second
Single pulsing tone twice per second
· High-low tone sounding twice per second
· Vibrator pulses twice per second
· Single pulsing tone twice per second for 5 seconds
· High-low tone sounding twice per second
· Vibrator pulses twice per second

Responding to Alarms
This section describes response to gas, over range, battery, sensor failure, HC Gas List, clock failure, system failure, man down, and panic alarms.
Responding to Gas Alarms
1. Determine which gas alarm has been activated.
2. Follow your established procedure for an increasing gas condition or a decreasing oxygen condition.
3. Reset the alarm as necessary or allowed.

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Buzzer Silence
Buzzer silence can be turned on or off using the SDM-3R PC Controller program or the GX-3R Datalogging Program.
Table 7 summarizes resetting and silencing alarms for all LATCHING and SILENCE setting combinations.
Table 7: Resetting and Silencing Alarms

LATCHING: ON (factory setting) LATCHING: OFF

BUZZER SILENCE: ON

· Press and release the POWER MODE or AIR buttons to silence the buzzer.
· If the gas concentration was still above the alarm level when the button was pressed, the LED arrays continue to flash, the vibrator continues to pulse, and the GX-3R continues to display the current alarm level.
· The gas reading must fall below (or rise above for an oxygen low alarm) an alarm setting before you can reset the alarm, the LEDs, and the vibrator using the POWER MODE or AIR buttons.
NOTE: If Password Protection is ON (factory setting: OFF) using the SDM-3R PC program, you must press POWER MODE and AIR simultaneously and then enter the user-set password to reset an alarm condition.

· Press and release the POWER MODE or AIR buttons to silence the buzzer.
· The POWER MODE or AIR buttons will not reset the alarm.
· The alarm, LEDs, and vibrator will automatically reset when gas reading falls below (or rises above for an oxygen low alarm) an alarm setpoint.

BUZZER SILENCE: OFF (factory setting)

· Pressing POWER MODE or AIR will not silence buzzer.
· The gas reading must fall below (or rise above for an oxygen low alarm) an alarm setting before you can reset the alarm condition using the POWER MODE or AIR buttons.

· Pressing POWER MODE or AIR will not silence buzzer.
· The alarm condition will automatically reset when the gas reading falls below (or rises above for an oxygen low alarm) an alarm setpoint.

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Chapter 3: Operation · 41

Responding to an H2 RICH Alarm (H2-Compensated CO Sensor Only)
The H2 RICH alarm automatically clears once the hydrogen level decreases below 2000 ppm (parts per million).
Responding to Over Range Alarms
WARNING: An over range condition may indicate an extreme combustible gas, toxic gas, or oxygen concentration. Confirm the gas concentration with a different GX-3R Pro or with another gas detecting device.
CAUTION: High off-scale readings may indicate an explosive concentration.
1. Determine which channel is in alarm. 2. Follow your established procedure for an extreme gas condition. 3. If LATCHING is set to ON (factory setting) in Maintenance Mode, reset the alarm using
POWER MODE or AIR once the alarm condition clears. If Password Protection is turned On (factory setting is Off) using the SDM-3R PC program, you must press POWER MODE and AIR at the same time and then enter a userset password to reset an alarm condition. When the password screen appears, adjust each digit with the AIR button and press and release the POWER MODE button to move on to the next digit. Once the password is entered, the alarm condition resets.
7:49
0000
PASSWORD
4. Calibrate the GX-3R Pro as described on page 75. 5. If the over range condition continues or if you are not able to successfully calibrate the unit,
you may need to replace the sensor that has triggered the over range alarm. 6. If the over range condition continues after you have replaced the sensor, contact RKI
Instruments, Inc. for further instructions.

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Responding to Battery Alarms
WARNING: The GX-3R Pro is not operational as a gas monitoring device during a dead battery alarm. Take the Model GX-3R Pro to a non-hazardous area and replace or recharge the batteries as described on page 118 and page 120.
The GX-3R Pro is fully functional during a low battery warning. Proper instrument operation is only guaranteed for 10 minutes but the instrument will operate for 1-2 hours after the start of the alarm. However, only 1-2 hours of operating time remains. The amount of operating time left depends on LCD backlight use and the alarm frequency. Recharge the Li-ion battery pack (page 120) or replace the alkaline batteries (page 118) as soon as possible.
NOTE: Alarms and the LCD backlight consume battery power and reduce the amount of operating time remaining.
Responding to Sensor Failure Alarms
1. Determine which sensor triggered the sensor failure alarm.
2. Calibrate the failed sensor, as described on page 75.
3. If the sensor failure continues or if the sensor could not be calibrated, replace the sensor as described on page 127.
4. If the sensor failure condition continues, contact RKI Instruments, Inc. for further instructions.
Responding to an HC Gas List Alarm
An HC Gas List alarm can occur at startup or after a calibration.
1. Press and release POWER MODE to acknowledge the alarm. The combustible gas sensor actually contains 2 separate sensors: a standard catalytic sensor and a backup, poison-resistant sensor that is resistant to sensor poisons like silicone. An HC Gas List alarm indicates that the standard sensor has a reduced output, possibly due to one or more sensor poisons in the environment, and that the poison-resistant sensor is being used to provide gas readings. The poison-resistant sensor has a limited list of detectable gases. Table 10 on page 51 shows which gases can and cannot be detected after receiving an HC Gas List alarm. If your application requires detection of a gas still detectable after an HC Gas List condition (like methane or isobutane), there is no need to replace the combustible gas sensor. However, if your application requires detection of a gas not detectable after an HC Gas List condition (like methanol or ethanol), you must replace the combustible gas sensor as soon as possible.

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Chapter 3: Operation · 43

Responding to Clock Failure Alarms
A clock failure alarm occurs if the unit’s internal clock malfunctions. A clock failure alarm might also occur if the battery becomes too drained during storage. See page 134 for storage information.
7:49

FAIL CLOCK
1. Press and release POWER MODE to continue into Measuring Mode.
CAUTION: If you operate the instrument after a clock failure, data will still be logged but the date/time will be incorrect. Set the date/time as described on page 112 as soon as possible to ensure logged data uses the correct date/time.

2. Attempt to set the date using the DATE User Mode menu item as described on page 112. 3. If the date cannot be set correctly, contact RKI Instruments, Inc. as soon as possible.
Responding to System Failure Alarms
1. If a system failure occurs, an error code displays as shown below:
7:49

031

FAIL SYSTEM

2. The error code meanings are shown in the table below:

Error Code Explanation

000

ROM failure

010

RAM failure

021

FRAM failure

031

FLASH memory failure

080

Acceleration sensor failure

081

PCB failure

082

Temperature sensor failure

083

Bluetooth failure

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3. If the error code is anything but 031, the instrument cannot be used. Contact RKI Instruments, Inc. as soon as possible. If the error code is 031, you may press and release POWER MODE to continue into Measuring Mode if the instrument must be used temporarily.
CAUTION: There will be no datalogging function if you operate the instrument after a 031 system failure. Contact RKI Instruments, Inc. as soon as possible.
Responding to a Man Down Warning 1 and Warning 2
The Man Down Warning 1 and Warning 2 alarms occur after the WARNING 1 TIME and WARNING 2 TIME, respectively, has passed since the last movement of the instrument. See page 100 for instructions to change these values.
1. Follow your established procedure for a man down warning.
2. To silence the alarm and reset the Man Down clock, move the instrument or press and release POWER MODE.
Responding to a Man Down Alarm
The Man Down Alarm alarms occur after the ALARM TIME has passed since the last movement of the instrument. See page 100 for instructions to change this value.
1. Follow your established procedure for a man down alarm.
2. To silence the alarm and reset the Man Down clock, press and release POWER MODE or AIR. Moving the instrument will not reset the alarm or Man Down clock.
Responding to a Panic Alarm
If the user is in a dangerous situation or feels that others must be alerted to any sort of problem, forcefully tapping the instrument twice will initiate a panic alarm.
1. Press and release POWER MODE or AIR to silence and reset the alarm.

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Chapter 3: Operation · 45

Data Logging

The GX-3R Pro logs Measuring Mode gas readings, alarm data, and calibration data to its internal memory. Logged data can be download it to a computer via the infrared communications port on the front of the unit.
To utilize the GX-3R Pro’s downloading capability, you will need the GX-3R Data Logger Management Program and a computer with an infrared port or a USB port that runs one of the following operating systems: Windows 7, Windows 8, Windows 10, or Windows 11. If your computer has an infrared port, then no additional accessories are needed to download data from the GX-3R Pro. If your computer does not have an infrared port but does have a USB port, a USB/ IrDA adapter cable can be used to download data from the GX-3R Pro. The GX-3R Data Logger Management Program is available at www.rkiinstruments.com/gx3rpro. The USB/IrDA adapter cable is available from RKI Instruments, Inc.
The data logging capacity depends on how often the GX-3R Pro stores data, how many channels are active, and how often the GX-3R Pro is turned on and off. The table below illustrates how much data logging time is available for the various interval times. It assumes that the unit has four sensors, is only turned on once, and there are no alarm occurrences. The data logging interval time must be set using the GX-3R Data Logger Management Program.

Table 8: Data Logging Capacity

Interval Time

Data Logging Time

10 seconds

10 hours

20 seconds

20 hours

30 seconds

30 hours

1 minute

60 hours

3 minutes

180 hours

5 minutes (factory setting) 10 minutes

300 hours 600 hours

For a complete description of the Data Logger Management Program and procedures for downloading data to a computer, see the GX-3R Data Logger Management Program Operator’s Manual.

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Chapter 4:

Display Mode

This section describes Display Mode which is accessible from Measuring Mode. See the table 8 below for a list of Display Mode’s menu items, a short description of each item, and the page number for further description.
Table 9: Display Mode Items

Display Mode Menu Item

Description

PEAK (page 49)

Displays each sensor’s Peak reading.

STEL (page 50) TWA (page 50) HC GAS LIST (page 50)A
USER ID (page 53)C

Displays the STEL readings (CO, H2S, and CO2/super toxic only). Displays the TWA readings (CO, H2S, and CO2/super toxic only). Change the target gas for the catalytic sensor.

· CH4 (methane) · i-C4H10 (isobutane) · H2 (hydrogen) · CH3OH (methanol) · C2H2 (acetylene) · C2H4 (ethylene) · C2H6 (ethane) · C2H5OH (ethanol) · C3H6 (propylene) · C3H6O (acetone) · C3H8 (propane) · C4H6 (butyne) · C5H10 (cyclopentane) · C6H6 (benzene)

· n-C6H14 (hexane) · C7H8 (toluene) · n-C7H16 (heptane) · C8H10 (xylene) · n-C9H20 (nonane) · EtAc (ethyl acetate) · IPA (isopropyl alcohol) · MEK (methyl ethyl ketone) · MMA (methyl methacrylate) · DME (dimethyl ether) · MIBK (methyl isobutyl ketone) · THF (tetrahydrofuran) · n-C5H12 (n-pentane)

View and/or change the User ID.

STATION ID (page 54)C

View and/or change the Station ID.

CAL DATA (page 54)D

Displays the last calibration date for each sensor.

BUMP DATA (page 55)E

Displays the last bump test date for each sensor.

DATE (page 56)

Displays the current date, time, and temperature.

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Chapter 4: Display Mode · 47

Table 9: Display Mode Items

Display Mode Menu Item

Description

ALARM POINTS View alarm points (page 57)

INVERT SELECT (page 58)B

ON: The LCD stays upside down relative to the instrument. AUTO: The LCD automatically flips as the instrument is rotated to remain readable whether the instrument is right side up or upside down. OFF (factory setting): The LCD stays right side up relative to the instrument.

LCD BACKGROUND (page 58)B

ON: LCD has black background with white characters. OFF (factory setting): LCD has white background with black characters.

BLUETOOTH (page 59)B

ON: Turns Bluetooth functionality on. OFF (factory setting): Turns Bluetooth functionality off.

BUZZER VOLUME (page 59)B

HIGH (factory setting): Buzzer volume is high. LOW: Buzzer volume is low.

LANGUAGE (page 60)F

Change the language of the instrument back to English if something other than English was selected in User Mode.

A Only appears if D MODE SETTING is set to ON in User Mode (factory setting) and if CH4 or i-
C4H10 is selected for the combustible gas in Gas Select Mode. BOnly appears if D MODE SETTING is set to ON in User Mode (factory setting). C Only appears if D MODE SETTING is set to ON in User Mode (factory setting) and if ID DISPLAY is set to ON in Maintenance Mode (factory setting is OFF). D Only appears if CAL REMINDER is set to ON in User Mode (factory setting). E Only appears if BUMP REMINDER is set to ON in User Mode (factory setting is OFF). F Only appears if LANGUAGE is set to something other than ENGLISH in Maintenance Mode.

Tips for Using Display Mode
· To enter Display Mode and scroll from one menu item to the next or skip an item when a question is asked, press and release POWER MODE.
· To enter an item, press and release AIR. · To change a flashing parameter, use AIR. To reverse the direction of movement in a list (ie.
from down to up or vice versa): a. Press and hold AIR. b. Immediately press POWER MODE and then release both buttons.

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· To exit from an entered-information screen and go back to the main menu, press and release POWER MODE.
NOTE: Each screen displays for 20 seconds. If you do not press a button for 20 seconds, the GX-3R Pro automatically returns to Measuring Mode.

Peak Screen (PEAK)
The peak screen displays the highest (lowest for oxygen) concentrations detected since the GX3R Pro was turned on. Peak readings are stored in the GX- 3R Pro’s memory until a higher level is detected (lower for oxygen), the peak reading is cleared, or the GX-3R Pro is turned off. The lunch break feature enables the GX-3R Pro to save peak readings when it is turned off so it can continue with the same peaks when it is turned on again. See page 105 for instructions to turn the lunch break feature on (default is off). To clear the peak readings, do the following:
NOTE: If Password Protection is set to On using the SDM-3R PC program, the peak reading cannot be cleared.

1. While in Display Mode, press and release POWER MODE until PEAK appears.

CH4 %LEL CO
12

O2

%

18.7

7:49
ppm H2S ppm
7 23.0

CO2

vol%

5.50

PEAK

2. Press and hold AIR until the screen prompts you to release it.

7:49

7:49

HOLD AIR KEY

RELEASE

PEAK CLEAR

PEAK CLEAR

3. The peak readings are reset and the unit returns to the Peak Screen.
If you do not want to clear the peak readings, release AIR before the above screen sequence occurs. The unit returns to the Peak Screen.

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Chapter 4: Display Mode · 49

STEL Screen (STEL)

The STEL Screen displays the short term exposure limit (STEL) readings for H2S, CO, CO2, and super toxic only. The STEL reading is the average reading over the last 15 minutes.

7:49

CO

ppm H2S ppm

2 3.0

CO2

vol%

1.50

STEL

TWA Screen (TWA)

The TWA Screen displays the time weighted average (TWA) readings for H2S, CO, CO2, and super toxic only.

7:49

CO

ppm H2S ppm

6 5.5

CO2

vol%

0.75

TWA

The TWA reading is the average reading over the last 8 hours. If 8 hours have not elapsed since the last time the TWA reading was cleared, the average is still calculated over 8 hours. The missing readings are assigned a 0 value. If LUNCH BREAK is set to OFF (factory setting), the TWA is cleared when the GX-3R Pro is turned off.
If LUNCH BREAK is set to ON, the GX-3R Pro will remember TWA readings when it is turned off so it can continue them when it is turned on again. See page 105 for instructions to turn the lunch break feature on (default is off).

Combustible Sensor Target Gas Conversion (HC GAS LIST)
This screen only appears if D MODE SETTING in User Mode is set to ON (factory setting) and if the instrument’s calibrated target gas is CH4 or iC4H10 (select target gas in Gas Select Mode’s GAS COMBO item, calibrate with target gas in User Mode’s GAS CAL item).
The HC GAS LIST screen allows you to select a converted target gas based on a CH4 or iC4H10 calibration. It does not change the calibrated target gas. You must go to Gas Select Mode’s GAS COMB item to change the calibrated target gas.
Selecting a converted target gas in HC GAS LIST (based on a CH4 or iC4H10 calibration) does not provide the same reading accuracy as selecting a calibrated target gas in Gas Select Mode’s GAS COMBO item and calibrating with that target gas in User Mode.

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Selecting a converted target gas in HC GAS LIST does not mean that the combustible gas sensor will respond only to that gas. The combustible gas sensor responds to a number of gases regardless of the target gas selection.

NOTE: If H2 is selected as the target gas in HC GAS LIST, the sensor will only respond to H2 and will not respond to any other gas, regardless of the gas listings in Table 10.

If you select a new converted target gas, the change is saved if you turn the instrument off and on.
Table 10: Available HC Gas Conversions

Available Converted

Target Gases Based on

Calibrated Target Gas Available

Gas

(Selected in Gas Select Mode)

Converted Target Gases During HC

Gas List Condition

CH4

i-C4H10

(methane) (isobutane)

CH4 (methane)

x

O

i-C4H10 (isobutane)

O

O

H2 (hydrogen)

O

O

O

CH3OH (methanol)

O

O

x

C2H2 (acetylene)

O

O

O

C2H4 (ethylene)

O

O

O

C2H6 (ethane)

O

x

O

C2H5OH (ethanol)

O

O

x

C3H6 (propylene)

O

O

O

C3H6O (acetone)

O

O

x

C3H8 (propane)

O

x

O

C4H6 (butyne)

O

O

O

C5H10 (cyclopentane)

O

O

O

C6H6 (benzene)

O

O

x

n-C6H14 (hexane)

O

O

O

C7H8 (toluene)

O

O

x

n-C7H16 (heptane)

O

O

O

C8H10 (xylene)

O

O

x

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Chapter 4: Display Mode · 51

Table 10: Available HC Gas Conversions

Available Converted

Target Gases Based on

Calibrated Target Gas Available

Gas

(Selected in Gas Select Mode)

Converted Target Gases During HC

Gas List Condition

CH4

i-C4H10

(methane) (isobutane)

n-C9H20 (nonane)

O

O

x

EtAc (ethyl acetate)

O

O

x

IPA (isopropyl alcohol)

O

O

x

MEK (methyl ethyl ketone) O

O

x

MMA (methyl methacrylate) O

O

x

DME (dimethyl ether)

O

O

x

MIBK (methyl isobutyl

O

O

x

ketone)

THF (tetrahydrofuran)

O

O

x

n-C5H12 (n-pentane)

O

O

O

x = not available O = available

1. While in Display Mode, press and release POWER MODE until HC GAS LIST appears. The current setting displays on the top line.

7:49

7:49

CH4 CHANGE : AIR HC GAS LIST

CH4 NO : MODE
HC GAS LIST

2. Press and release AIR to enter the screen. A cursor appears to the left of the current gas selection.
7:49
CH4 i-C4H10 H2 HC GAS LIST

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3. Use AIR to scroll through the list of gases.
4. With the cursor next to the desired gas, press and release POWER MODE. The instrument saves the changes and returns to the HC GAS LIST screen.
5. The gas formula displays at the bottom of the Measuring Mode screen. The gas selection remains in effect if you turn the instrument off and on again.

User ID Screen (USER ID)

This screen only appears if D MODE SETTING in User Mode is set to ON (factory setting) and if ID DISPLAY in Maintenance Mode is set to ON (factory setting is OFF).
Use this screen to select a user ID from the 128 user IDs stored in the GX-3R Pro’s memory. Before a user ID is selected on a brand new instrument, the user ID is “———-“. The factoryinstalled user IDs have a “U_ID_XXX” format.
The user ID provides a way to identify the GX-3R Pro user during a data logging session.
User IDs can only be selected in this menu item. You must use the GX-3R Datalogging Program to edit the 128 user IDs.

1. After entering Display Mode, press and release POWER MODE until USER ID appears.

7:49
U_ID_002

7:49
U_ID_002

CHANGE : AIR USER ID

NO : MODE USER ID

2. To change the User ID, press and release AIR. The current User ID flashes.
7:49
U_ID_002

USER ID
3. Use AIR to scroll to the desired User ID. 4. Press and release POWER MODE to save the User ID and return to the USER ID screen in
Display Mode.

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Chapter 4: Display Mode · 53

Station ID Screen (STATION ID)

This screen only appears if D MODE SETTING in User Mode is set to ON (factory setting) and if ID DISPLAY in Maintenance Mode is set to ON (factory setting is OFF).

Use this screen to select a station ID from the 128 station IDs stored in the GX-3R Pro’s memory. Before a station ID is selected on a brand new instrument, the station ID is “———-“. The factory-installed station IDs have a “S_ID_XXX” format.

The station ID provides a way to identify the GX-3R Pro location during a data logging session.

Station IDs can only be selected in this menu item. You must use the GX-3R Datalogging Program to edit the 128 station IDs.

1. After entering Display Mode, press and release POWER MODE until STATION ID appears.

7:49
S_ID_002

7:49
S_ID_002

CHANGE : AIR STATION ID

NO : MODE STATION ID

2. To change the station ID, press and release AIR. The current station ID flashes.
7:49
S_ID_002

STATION ID
3. Use AIR to scroll to the desired station ID. 4. Press and release POWER MODE to save the station ID and return to the STATION ID
screen in Display Mode.
Last Successful Calibration Date (CAL DATA)
The CAL DATA screen shows the date of each installed sensors’ last successful calibration. This screen only appears if CAL REMINDER is set to ON in User Mode. 1. While in Display Mode, press and release POWER MODE until CAL DATA appears.
7:49
YES : AIR NO : MODE CAL DATA

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2. Press AIR to enter the CAL DATA screen and to scroll through the installed sensors.

7:49
MM/DD/YYYY 10/16/2018
CH4 CAL DATA
AIR
7:49
MM/DD/YYYY 10/16/2018
O2 CAL DATA

7:49

AIR

MM/DD/YYYY

10/16/2018

H2S

CAL DATA

AIR
7:49
MM/DD/YYYY 10/16/2018
CO CAL DATA

AIR
7:49
MM/DD/YYYY 10/16/2018
AIR CO2 CAL DATA

3. When you are done viewing the last calibration date for the sensors, press and release POWER MODE to return to the CAL DATA screen in Display Mode.
Last Successful Bump Test Date (BUMP DATA)
The BUMP DATA screen shows the date of each installed sensors’ last successful bump test. This screen only appears if BUMP REMINDER is set to ON in User Mode. 1. While in Display Mode, press and release POWER MODE until BUMP DATA appears.
7:49
YES : AIR NO : MODE BUMP DATA

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Chapter 4: Display Mode · 55

2. Press AIR to enter the BUMP DATA screen and to scroll through the installed sensors.

7:49
MM/DD/YYYY 10/16/2018
CH4 BUMP DATA
AIR
7:49
MM/DD/YYYY 10/16/2018
O2 BUMP DATA

7:49

AIR

MM/DD/YYYY

10/16/2018

H2S

BUMP DATA

AIR

7:49
MM/DD/YYYY 10/16/2018
CO BUMP DATA

AIR

7:49
MM/DD/YYYY 10/16/2018
AIR CO2 BUMP DATA

3. When you are done viewing the last bump test date for the sensors, press and release POWER MODE to return to the BUMP DATA screen in Display Mode.

Date, Time, Temperature Screen (DATE)

The DATE screen shows the date and time of the instrument and the temperature of the surrounding area.

1. While in Display Mode, press and release POWER MODE until DATE appears.

7:49

MM/DD/YYYY

1/14/2019

7:49

DATE

24°C

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Alarm Points Screen (ALARM POINTS)
The Alarm Points Screen shows the gas alarm settings for all active channels.

  1. While in Display Mode, press and release POWER MODE until ALARM POINTS appears.
    7:49

YES : AIR NO : MODE ALARM POINTS
2. Press and release AIR to enter the Alarm Points screen. The Full Scale Settings screen appears and shows full scale settings for each channel.
3. Use AIR to scroll through the Warning, Alarm, Alarm H, STEL, and TWA settings.

7:49

CH4 %LEL CO

ppm H2S ppm

100 2000 200.0

O2

%

40.0

CO2

vol%

10.00

FULL SCALE

AIR

7:49

CH4 %LEL CO

ppm H2S ppm

10 25 5.0

O2

%

19.5

CO2

vol%

0.50

WARNING

AIR

7:49

CH4 %LEL CO

ppm H2S ppm

25 50 30.0

O2

%

18.0

CO2

vol%

3.00

ALARM

7:49

AIR

CH4 %LEL CO

ppm H2S ppm

50 1200 100.0

O2

%

23.5

CO2

vol%

3.00

ALARM H

AIR

7:49

CO

ppm H2S ppm

200 5.0

CO2

vol%

3.00

STEL

AIR

7:49

CO

ppm H2S ppm

25 1.0

CO2

vol%

0.50

TWA

AIR

4. While viewing the alarm settings for a particular alarm point, press and release AIR and POWER MODE at the same time to simulate the alarm conditions. The buzzer will sound, the LEDs will flash, and the instrument will vibrate just as it would if the displayed condition was actually happening.

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Chapter 4: Display Mode · 57

5. Press and release POWER MODE to return to the ALARM POINTS item in Display Mode.

Screen Inversion On/Off (INVERT SELECT)

The INVERT SELECT screen allows you to turn the screen inversion function on or off. This screen only appears if D MODE SETTING in User Mode is set to ON (factory setting).
ON: The LCD stays upside down relative to instrument.
AUTO: The LCD automatically flips to remain readable whether the instrument is right side up or upside down.
OFF (factory setting): The LCD stays right side up relative to the instrument.

1. While in Display Mode, press and release POWER MODE until INVERT SELECT appears. The current setting displays on the top line.

7:49

7:49

OFF CHANGE : AIR INVERT SELECT

OFF NO : MODE INVERT SELECT

2. Press and release AIR. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to the INVERT SELECT screen.

LCD Color Scheme (LCD BACKGROUND)

The LCD BACKGROUND screen allows you to change the appearance of the LCD. This screen only appears if D MODE SETTING in User Mode is set to ON (factory setting). ON: LCD has black background with white characters. OFF (factory setting): LCD has white background with black characters.

1. While in Display Mode, press and release POWER MODE until LCD BACKGROUND appears. The current setting displays on the top line.

7:49

7:49

OFF CHANGE : AIR LCD BACKGROUND

OFF NO : MODE LCD BACKGROUND

2. Press and release AIR. The current setting flashes. 3. Use AIR to display the desired setting.

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4. Press and release POWER MODE to save the setting and return to the LCD BACKGROUND screen.

Turning Bluetooth On/Off (BLUETOOTH)

The BLUETOOTH screen allows you to turn the GX-3R Pro’s Bluetooth functionality on and off. This screen only appears if D MODE SETTING in User Mode is set to ON (factory setting).

ON: Turns Bluetooth functionality on, allowing for connection to the RK Link app on your phone.

If BLE Auto Shut Off When Idle, accessible in the Datalogging or SDM-3R Program, is selected (factory setting) and if the GX-3R Pro does not pair to a phone in the first 5 minutes after startup, the GX-3R Pro’s Bluetooth gets shut off to conserve battery life.

If BLE Auto Shut Off When Idle, accessible in the Datalogging or SDM-3R Program, is deselected and if the GX-3R Pro does not pair to a phone, the GX- 3R Pro’s Bluetooth stays on indefinitely.

OFF (factory setting): Turns Bluetooth functionality off.

1. While in Display Mode, press and release POWER MODE until BLUETOOTH appears. The current setting displays on the top line.

7:49

7:49

OFF CHANGE : AIR
BLUETOOTH

OFF NO : MODE BLUETOOTH

2. Press and release AIR. The current setting flashes. 3. Use AIR to display the desired setting. 4. Press and release POWER MODE to save the setting and return to the BLUETOOTH screen.

Adjusting the Buzzer Volume (BUZZER VOLUME)
The BUZZER VOLUME screen allows you to adjust the volume of the instrument’s buzzer. This screen only appears if D MODE SETTING in User Mode is set to ON (factory setting). HIGH (factory setting): Buzzer volume is high. LOW: Buzzer volume is low.

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Chapter 4: Display Mode · 59

1. While in Display Mode, press and release POWER MODE until BUZZER VOLUME appears. The current setting displays on the top line.

7:49

7:49

HIGH CHANGE : AIR BUZZER VOLUME

HIGH NO : MODE BUZZER VOLUME

2. Press and release AIR. The current setting flashes.
3. Use AIR to display the desired setting.
4. Press and release POWER MODE to save the setting and return to the BUZZER VOLUME screen.

Changing Instrument Language Back to English (LANGUAGE)

This screen only appears if the LANGUAGE item in Maintenance Mode is set to something other than ENGLISH.

1. While in Display Mode, press and release POWER MODE until the LANGUAGE screen appears.

7:49
LANGUAGE CHANGE TO ENGLISH
YES : AIR

7:49
LANGUAGE CHANGE TO ENGLISH
NO : MODE

2. Press and release AIR.
7:49
CHANGE TO ENGLISH

7:49
CHANGE TO ENGLISH

YES : AIR

NO : MODE

3. Press and release POWER MODE to confirm that you want to change the language back to English.

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Chapter 5:

User Mode and Calibration

Overview

This section describes the GX-3R Pro in User Mode. See Table 11 for a list of the items found in User Mode, the page that the menu item’s instructions can be found on, and a short description of the menu item.
Table 11: User Mode Items

User Mode Menu Item
BUMP TEST (page 68)

Description

Perform a bump test.

BUMP TEST CYL X

Perform a bump test on the gases selected for Cylinder X (A-E cylinders available).

START MEASURE

Begin the warmup sequence and enter Measuring Mode.

ESCAPE

Return to BUMP TEST menu item.

GAS CAL (page 75) Perform a fresh air adjustment, perform a span adjustment, change the calibration gas concentration, set the cylinder group.

AIR CAL (page 75)

Perform a fresh air adjustment.

CO2 ZERO CAL (page 76)
AUTO CAL (page 79)

Perform a zero adjustment on the CO2 channel using 100% nitrogen.

NOTE: Only appears in units with a CO2 sensor installed.

AUTO CAL CYL X

Perform an automatic span adjustment on the gases selected for Cylinder X (A-E cylinders available).

START MEASURE

Begin the warmup sequence and enter Measuring Mode.

SETTING CAL-P

Set the calibration gas concentration for each gas.

CYL SETTING

Assign a cylinder (A-E) to each gas. Multiple gases can be assigned to the same cylinder.

ESCAPE

Return to the AUTO CAL menu item.

ESCAPE

Return to the GAS CAL menu item.

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Chapter 5: User Mode and Calibration · 61

User Mode Menu Item CAL SETTING (page 90)
BUMP SETTING (page 93)

Table 11: User Mode Items

Description

Change calibration parameters.

CAL REMINDER (page 90)

ON (factory setting): The instrument notifies the user upon startup when a calibration is due. Notification type depends on CAL EXPD setting below.
OFF: No notification upon startup when a calibration is due.

CAL

How often the instrument needs to be calibrated.

INTERVAL (page Options: 1 – 1000 days (factory setting is 90 days) 91)

CAL EXPIRED (page 91)

Defines what action must be taken if a calibration is due upon startup.
CONFIRM TO USE (factory setting): Press and release AIR to acknowledge that calibration is due and continue to Measuring Mode.
CANNOT USE: Cannot enter Measuring Mode until a successful calibration is performed.
NO EFFECT: A screen indicates that calibration is due but warmup sequence continues.

CAL CHECK GAS (page 92)
ESCAPE

ALL GAS (factory setting): Calibration dates for all gases are used to determine if calibration is due. 4 GAS: Calibration dates for only the standard 4 gases (combustible gas/O2/H2S/CO) are used to determine if calibration is due.
Return to the CAL SETTING menu item in User Mode.

Change bump test parameters.

BUMP PARAMETER (page 93)

GAS TIME
TOLERANCE

How long gas is applied during a bump test. Choices: 30 (factory setting), 45, 60, 90 seconds
Percentage of calibration gas concentration that the bump test reading must be within in order to pass bump. Options: 10%, 20%, 30%, 40%, 50% (factory setting)

CAL TIME

How long gas is applied during a calibration. GAS TIME is deducted from this time. Options: 90 (factory setting) or 120 seconds

AUTO CAL

ON (factory setting): If a bump test fails, a calibration automatically starts.
OFF: If a bump test fails, a calibration does not automatically start.

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Table 11: User Mode Items

User Mode Menu Item

Description

BUMP SETTING (page 93) cont.

BUMP PARAMETER (page 93)
cont.

ESCAPE

Return to the BUMP PARAMETER menu item in BUMP SETTINGS.

BUMP REMINDER (page 96)

ON: The instrument notifies the user upon startup when a bump test is due. Notification type depends on BUMP EXPIRED setting below.
OFF (factory setting): No notification upon startup when a bump test is due.

BUMP

How often the instrument needs to be bump tested.

INTERVAL (page Options: 0 – 30 days (factory setting is 30 days) 97)

BUMP EXPIRED (page 97)

Defines what action must be taken if a bump test is due upon startup.
CONFIRM TO USE (factory setting): Press and release AIR to acknowledge that bump test is due and continue to Measuring Mode.
CANNOT USE: Cannot enter Measuring Mode until a successful bump test is performed.
NO EFFECT: A screen indicates that bump test is due but warmup sequence continues.

BUMP CHECK GAS (page 98)
ESCAPE

ALL GAS (factory setting): Bump test dates for all gases are used to determine if bump test is due. 4 GAS: Bump test dates for only the standard 4 gases (combustible gas/O2/H2S/CO) are used to determine if bump test is due.
Return to the BUMP SETTING menu item in User Mode.

MAN DOWN (page 99)

Turn the man down and panic alarms on and off. Set the intervals for man down alarms.

MAN DOWN (page 99)

ON: Man down alarm is triggered if the instrument does not detect motion during time period defined in WARNING 1 TIME, WARNING 2 TIME, and ALARM TIME below.
OFF (factory setting): No man down alarm triggered.

PANIC (page 100)

ON: Panic alarm can be triggered. OFF (factory setting): Panic alarm cannot be triggered.

MAN DOWN TIME (page 100)

ALARM TIME WARNING 2 TIME TIME The settings range is 10 – 240 seconds.

WARNING 1

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Chapter 5: User Mode and Calibration · 63

Table 11: User Mode Items

User Mode Menu Item

Description

MAN DOWN (page 99) cont.

MAN DOWN TIME (page 100) cont.

WARNING 1 TIME
WARNING 2 TIME

The amount of time that passes between a man down detection and the first warning alarm. Factory setting is 60 seconds.
The amount of time that passes between a man down detection and the second warning alarm. Factory setting is 75 seconds.

ALARM TIME

The amount of time that passes between a man down detection and a man down alarm. Factory setting is 90 seconds.

ESCAPE

Return to the MAN DOWN menu item.

ALARM SETTING Set alarm points for all channels (WARNING, ALARM, ALARM H, STEL, TWA) or

(page 101)

reset all alarms to their default settings.

LUNCH BREAK (page 105)

ON: Lunch break feature is on. At startup, instrument asks if you want to resume TWA and PEAK readings.
OFF (factory setting): Lunch break feature is off. Instrument resets TWA and PEAK readings every time it’s turned on.

CONFIRMATION (page 105)

Set confirmation beep parameters.

BEEP SELECT (page 106)

LED: LEDs flash and instrument vibrates based on interval defined in BEEP INTERVAL to confirm instrument is still operating.
BUZZER: Buzzer sounds and instrument vibrates based on interval defined in BEEP INTERVAL to confirm instrument is still operating.
LED+BUZZER: LEDs flash, buzzer sounds, and instrument vibrates based on interval defined in BEEP INTERVAL to confirm instrument is still operating.
BUMP/CAL: LEDs flash based on interval defined in BEEP INTERVAL if bump test or calibration is due.
ALARM ALERT: LEDs flash based on interval defined in BEEP INTERVAL if instrument goes into a gas alarm.
BUMP/CAL/ALARM: LEDs flash based on interval defined in BEEP INTERVAL if a) bump test is due, b) calibration is due, or c) instrument goes into a gas alarm.
OFF (factory setting): No alerts to confirm instrument is still operating or that a bump test or calibration are due.

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Table 11: User Mode Items

User Mode Menu Item

Description

CONFIRMATION (page 105) cont.

BEEP INTERVAL (page 107)

Confirmation alert interval. Confirmation type defined in BEEP SELECT.
Options: 0.5 minute and 1 to 99 minutes in 1 minute increments. Factory setting is 5 minutes.

ESCAPE

Return to the CONFIRMATION menu item in User Mode.

AUTO BACKLIGHT (page 108)

ON (factory setting): The instrument’s backlight automatically turns on in a low light environment.
OFF: The instrument’s backlight does not automatically turn on in a low light environment.

BACKLIGHT TIME How long the back light stays on after the last button press.

(page 108)

Options: 0 – 255 seconds or OFF. The factory setting is 30 seconds.

KEY TONE (page 109)

ON (factory setting): Buzzer sounds when a button is pressed. OFF: Buzzer does not sound when a button is pressed.

D MODE SETTING (page 109)

OFF: LIST, USER ID, STATION ID, INVERT SELECT, LCD BACKGROUND, BLUETOOTH, BUZZER VOLUME, and LANGUAGE items do not appear in Display Mode.
ON (factory setting): LIST, INVERT SELECT, LCD BACKGROUND, BLUETOOTH, BUZZER VOLUME, and LANGUAGE items appear in Display Mode. USER ID and STATION ID screens appear if ID DISPLAY in Maintenance Mode is also set to ON.

ZERO SUPPRESS (page 110)

ON (factory setting): Not intended for field adjustment. The suppression values are:
Combustible Gas: 2% LEL
O2: 0.5% volume H2S: 0.3 ppm CO: 2 ppm
CO2: 0 ppm HCN: 0.5 ppm
NH3: 4 ppm NO2: 0.30 ppm PH3: 0.02 ppm SO2: 0.20 ppm
NOTE: Only appears if DISP ZERO SUP is set to ON in Maintenance Mode.

ZERO FOLLOWER (page 110)

Not intended for field adjustment. The default setting is ON for every channel except oxygen. Oxygen channel does not support zero follower functionality.
NOTE: Only appears if DISP ZERO FLWR is set to ON in Maintenance Mode.

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Chapter 5: User Mode and Calibration · 65

Table 11: User Mode Items

User Mode Menu Item

Description

IR UNIT SELECT (page 111) cont.
CO2AIR SETTING (page 111)
DATE (page 112)

Select the units for the IR CO2 sensor. Options: vol% or ppm
NOTE: Only appears in units with a CO2 sensor installed.
ON: CO2 channel is set to 400 ppm (0.04% volume) during a demand zero, auto zero, or AIR CAL. OFF (factory setting): CO2 channel is not adjusted during a demand zero, auto zero, or AIR CAL.
NOTE: Only appears in units with a CO2 sensor installed.
Set the current date and time.

DATE FORMAT (page 112)

MM/DD/YYYY (factory setting): month/day/year YYYY/MM/DD: year/month/day DD/MM/YYYY: day/month/year

LANGUAGE (page 113)

Set the instrument language.
Options: English (factory setting), Japanese, Italian, Spanish, German, French, Portuguese, Russian, Korean, Chinese (TC)

USER PASSWORD ON: User Mode access is password-protected. Factory-set password is 0405.

(page 113)

OFF (factory setting): User Mode access is not password-protected.

ROM/SUM (page 114)

View the firmware information for the GX-3R Pro’s sensor board and main board.

RADIO STANDARD (page 115)

Approval numbers for radio agencies.

START MEASURE Press and release POWER MODE to begin the warmup sequence and enter Measuring

(page 116)

Mode.

Entering User Mode
WARNING: The GX-3R Pro is not in operation as a gas detector while in User Mode.
1. Take the GX-3R Pro to a non-hazardous location and turn it off if it is on. 2. Press and hold AIR, then press and hold POWER MODE. Release the buttons when you hear
a beep.

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3. The screen that appears depends on the setting of User Mode’s USER PASSWORD item. If USER PASSWORD is set to OFF (factory setting), continue with Step 6. If USER PASSWORD is set to ON, continue with Step 4.

MAINTE 7:49
BUMP TEST GAS CAL CAL SETTING USER MODE
USER PASSWORD set to OFF

MAINTE 7:49
0000 PASSWORD
USER PASSWORD set to ON

4. If USER PASSWORD in User Mode is set to ON, a password screen appears and the first digit flashes.
5. Use AIR to select each password number then press POWER MODE to save it and move on to the next number. To go back a number, press and hold AIR and POWER MODE for a few seconds. To reverse the direction of change (ie. from increasing to decreasing or vice versa): a. Press and hold AIR. b. Immediately press POWER MODE and then release both buttons.
6. The User Mode menu displays.
MAINTE 7:49
BUMP TEST GAS CAL CAL SETTING USER MODE
7. MAINTE at the top of the screen indicates that the GX-3R is in User Mode.
8. Use AIR to move through the User Mode menu items.

Tips for Using User Mode
· To scroll from one menu item to the next, press and release AIR. To reverse the scrolling direction: a. Press and hold AIR. b. Immediately press POWER/MODE and then release both buttons. c. The scrolling direction returns to the original direction when you exit and reenter a menu.
· To skip an item when a question is asked, press and release AIR. · To enter an item and to save any changes, press and release POWER MODE.

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Chapter 5: User Mode and Calibration · 67

· To change a flashing parameter, press and release AIR. To reverse the direction of change (ie. from increasing to decreasing or vice versa):
a. Press and hold AIR. b. Immediately press POWER MODE and then release both buttons. · To exit an entered menu item without saving a change, press and hold AIR and POWER MODE for a few seconds.

Performing a Bump Test (BUMP TEST)

Bump test the instrument before each day’s use with a known concentration of each target gas. The instrument does not need to be calibrated unless it does not pass the bump test. To bump test the GX-3R Pro, you will need:
· Known calibrating samples of the gases being detected

Channel Combustible Gas

Min. Cal. Gas Concentration
5% LEL

Max. Cal. Gas Concentration
75% LEL

Oxygen

0.0%

17.0%

Hydrogen Sulfide

1.0 ppm

200.0 ppm

Carbon Monoxide

15 ppm

2,000 ppm

Ammonia

8 ppm

400 ppm

Carbon Dioxide (0 – 10,000 ppm) 3,000 ppm

9,000 ppm

Carbon Dioxide (0 – 10.00% vol) 1.00% vol

4.00% vol

Hydrogen Cyanide

0.9 ppm

30.0 ppm

Nitrogen Dioxide

0.50 ppm

20.00 ppm

Phosphine

0.05 ppm

20.00 ppm

Sulfur Dioxide

0.50 ppm

100.00 ppm

· A 0.25 LPM fixed flow regulator · Non-absorbent tubing · Calibration cup 1. Confirm that the GX-3R Pro’s calibration gas values match the concentrations listed on the calibration gas cylinder(s) as described on page 85.
2. Confirm that your cylinder selections are appropriate as described on page 87.

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3. Install the calibration cup onto the GX-3R Pro. Use the label and imprinting to make sure that the calibration cup gets installed in the correct orientation relative to the GX-3R Pro. Be sure the calibration cup is pushed on all the way.

AIR

GX-3R Pro

POWER MODE

CO/H2S LEL O2 TOXIC

FRONT

Inlet
Figure 7: Calibration Cup Installation
4. Use the tubing to connect the regulator to the inlet of the calibration cup.
5. While in User Mode, use AIR to place the cursor next to BUMP TEST.
MAINTE 7:49
BUMP TEST GAS CAL CAL SETTING USER MODE

6. Press and release POWER MODE. The display shows the gases assigned to Cylinder A and their assigned calibration values (see page 85 if the calibration values do not match the calibration gas cylinder’s concentrations).

MAINTE 7:49

CH4 %LEL CO

ppm H2S ppm

50 50 25.0

O2

%

12.0

BUMP TEST CYLINDER A

7. If necessary, use AIR to scroll to the Bump screen for the gas(es) you want to bump test. As shipped from the factory, the standard 4 gases (combustible gas, O2, CO, and H2S) are assigned to Cylinder A. If a H2-compensated CO sensor is installed, H2 is assigned to Cylinder D but there is no reason to bump test the H2 response. Toxic sensors are assigned to Cylinder D or Cylinder E.
8. Make sure the GX-3R Pro has been turned on for at least 45 seconds before continuing.

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Chapter 5: User Mode and Calibration · 69

9. For toxic gas cylinders (like cylinders containing H2S), it is important to vent the regulator while installing it onto the cylinder. Venting the regulator during installation helps prevent air
from getting into the cylinder and degrading the gas. Open the regulator by turning the knob
counterclockwise and install it onto the cylinder.

10. With the appropriate Bump screen displayed, press and release POWER MODE.

11. The gas readings flash, the bottom of the screen indicates “BUMP TEST” and “APPLY GAS”, and the top of the screen counts down from the time defined in BUMP SETTINGBUMP PARAMETERGAS TIME.

MAINTE 30

CH4 %LEL CO

ppm H2S ppm

0 0 0.0

O2

%

20.9

BUMP TEST APPLY GAS

NOTE: To back out of the gas application screen without performing the bump test, press and release AIR and POWER MODE together.

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12. At the end of the countdown, the instrument analyzes the results. Follow the flow chart to determine the bump test outcome.

Y

Multiple Cylinders Assigned?

Y

N

Bump test passed?

N

AUTO CAL On? (default is on)

Y

N

A

Auto start after successful bump set to on? (default is on)

Y

N

D

Calibration passed?

Y

N

B

C

E

Multiple Cylinders Assigned?

Y

N

F

Auto start after successful cal set to on? (default is on)

Y

N

G

H

*NOTE: Auto start after successful bump/cal parameters set using Datalogging or SDM-3R PC Programs.

Figure 8: Bump Test Flow Chart

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Chapter 5: User Mode and Calibration · 71

Option A from Flow Chart

Option B from Flow Chart

Option C from Flow Chart

· Bump test passed · Multiple cylinders assigned

· Bump test passed · One cylinder assigned · Auto Start After Successful Bump set
to ON (factory setting)

· Bump test passed · One cylinder assigned · Auto Start After Successful Bump set
to OFF (factory setting is ON)

1. The instrument indicates that all channels passed the bump test. Use AIR to scroll between the bump test results and the bump test gas readings.

1. The instrument indicates that all channels passed the bump test. Use AIR to scroll between the bump test results and the bump test gas readings.

1. The instrument indicates that all channels passed the bump test. Use AIR to scroll between the bump test results and the bump test gas readings.

MAINTE 7:49

CH4 %LEL CO

ppm H2S ppm

P P P

O2

%

P

RESULT

MAINTE 7:49

CH4 %LEL CO

ppm H2S ppm

P P P

O2

%

P

RESULT

MAINTE 7:49

CH4 %LEL CO

ppm H2S ppm

P P P

O2

%

P

RESULT

AIR

AIR

AIR

MAINTE 7:49

CH4 %LEL CO

ppm H2S ppm

47 47 23.3

O2

%

11.9

BUMP TEST

MAINTE 7:49

CH4 %LEL CO

ppm H2S ppm

47 47 23.3

O2

%

11.9

BUMP TEST

MAINTE 7:49

CH4 %LEL CO

ppm H2S ppm

47 47 23.3

O2

%

11.9

BUMP TEST

2. Close the regulator. 3. Press and release POWER MODE
to move to the BUMP CYL X screen for the next cylinder. 4. Unscrew the regulator from the first cylinder and screw it into the next cylinder. 5. Repeat Step 9 through Step 12. 6. After the last cylinder is bump tested, press and release POWER MODE to go to the START item in the BUMP menu. 7. Press and release POWER MODE to enter Measuring Mode.

2. Close the regulator. 3. Unscrew the regulator. 4. Remove the calibration cup. 5. Press and release POWER MODE
to enter Measuring Mode.

2. Close the regulator. 3. Unscrew the regulator. 4. Remove the calibration cup. 5. Press and release POWER MODE
to return to the START item in the BUMP menu. 6. Press and release POWER MODE to enter Measuring Mode.

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Option D from Flow Chart

Option E from Flow Chart

Option F from Flow Chart

· Bump test failed · A-CAL set to OFF (factory setting is ON)

· Bump test failed · A-CAL set to ON (factory setting) · Calibration failed

1. The instrument shows which channels passed or failed the bump test. The LEDs flash and the buzzer sounds. Use AIR to scroll between the results and the readings.

MAINTE 7:49

CH4 %LEL CO

ppm H2S ppm

P P F

O2

%

P

RESULT

1. A calibration immediately and automatically starts. Continue to apply the calibration gas.
2. The calibration time is the difference between the GAS TIME and the CAL TIME values defined in the BUMP SETSETTINGS item in User Mode.

MAINTE
CH4 %LEL
30

60
H2S ppm
2.0

· Bump test failed · A-CAL set to ON (factory setting) · Calibration passed · Multiple cylinders assigned

1. A calibration immediately and automatically starts. Continue to apply the calibration gas.
2. The calibration time is the difference between the GAS TIME and the CAL TIME values defined in the BUMP SETSETTINGS item in User Mode.

MAINTE
CH4 %LEL
30

60
H2S ppm
2.0

AIR

MAINTE 7:49

CH4 %LEL CO

ppm H2S ppm

47 47 2.0

O2

%

11.9

BUMP TEST

2. Close the regulator. 3. Unscrew the regulator. 4. Remove the calibration cup. 5. Press and release POWER MODE to return
to the BUMP CYL A item in the BUMP menu. 6. Use AIR to scroll to START and press and release POWER MODE to enter Measuring Mode. 7. Calibrate the GX-3R Pro as soon as possible.

AUTO CAL APPLY GAS

3. The instrument shows which channels passed or failed the bump test/calibration. The LEDs flash and the buzzer sounds. Use AIR to scroll between the results and the readings.

MAINTE 7:49

CH4 %LEL CO

ppm H2S ppm

FP P FF

O2

%

P

RESULT

AIR

MAINTE 7:49

CH4 %LEL CO

ppm H2S ppm

30 47 2.0

O2

%

11.9

BUMP TEST

AIR

MAINTE 7:49

CH4 %LEL

H2S ppm

47

2.5

AUTO CAL APPLY GAS

3. The instrument shows which channels passed or failed the bump test/calibration. Use AIR to scroll between the results and the readings.

MAINTE 7:49

CH4 %LEL CO

ppm H2S ppm

FP P FP

O2

%

P

RESULT

AIR

MAINTE 7:49

CH4 %LEL CO

ppm H2S ppm

30 47 12.0

O2

%

11.9

BUMP TEST

AIR

MAINTE 7:49

CH4 %LEL

H2S ppm

47

20.5

AUTO CAL
4. Close the regulator. 5. Unscrew the regulator. 6. Remove the calibration cup. 7. Press and release POWER MODE to return
to the BUMP CYL A item in the BUMP menu. 8. Use AIR to scroll to START and press and release POWER MODE to enter Measuring Mode.

AUTO CAL
4. Close the regulator. 5. Press and release POWER MODE to move
to the BUMP CYL X screen for the next cylinder. 6. Unscrew the regulator from the first cylinder and screw it into the next cylinder. 7. Repeat Step 9 through Step 12. 8. After the last cylinder is bump tested, press and release POWER MODE to go to the START item in the BUMP menu. 9. Press and release POWER MODE to enter Measuring Mode.

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Chapter 5: User Mode and Calibration · 73

Option G from Flow Chart

Option H from Flow Chart

· Bump test failed · A-CAL set to ON (factory setting) · Calibration passed · One cylinder assigned · Auto Start After Successful Cal set to ON
(factory setting)

· Bump test failed · A-CAL set to ON (factory setting) · Calibration passed · One cylinder assigned · Auto Start After Successful Cal set to
OFF (factory setting is ON)

1. A calibration immediately and automatically starts. Continue to apply the calibration gas.
2. The calibration time is the difference between the GAS TIME and the CAL TIME values defined in the BUMP SETSETTINGS item in User Mode.

MAINTE
CH4 %LEL
30

60
H2S ppm
2.0

1. A calibration immediately and automatically starts. Continue to apply the calibration gas.
2. The calibration time is the difference between the GAS TIME and the CAL TIME values defined in the BUMP SETSETTINGS item in User Mode.

MAINTE
CH4 %LEL
30

60
H2S ppm
2.0

AUTO CAL APPLY GAS

3. The instrument shows which channels passed or failed the bump test/ calibration. Use AIR to scroll between the results and the readings.

MAINTE 7:49

CH4 %LEL CO

ppm H2S ppm

FP P FP

O2

%

P

RESULT

AIR

MAINTE 7:49

CH4 %LEL CO

ppm H2S ppm

30 47 12.0

O2

%

11.9

BUMP TEST

AIR

MAINTE 7:49

CH4 %LEL

H2S ppm

47

20.5

AUTO CAL APPLY GAS

3. The instrument shows which channels passed or failed the bump test/ calibration. Use AIR to scroll between the results and the readings.

MAINTE 7:49

CH4 %LEL CO

ppm H2S ppm

FP P FP

O2

%

P

RESULT

AIR

MAINTE 7:49

CH4 %LEL CO

ppm H2S ppm

30 47 12.0

O2

%

11.9

BUMP TEST

AIR

MAINTE 7:49

CH4 %LEL

H2S ppm

47

20.5

AUTO CAL
4. Close the regulator. 5. Unscrew the regulator. 6. Remove the calibration cup. 7. Press and release POWER MODE to
enter Measuring Mode.

AUTO CAL
4. Close the regulator. 5. Unscrew the regulator. 6. Remove the calibration cup. 7. Press and release POWER MODE to
return to the START item in the BUMP menu. 8. Press and release POWER MODE to enter Measuring Mode.

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Performing a Calibration (GAS CAL)
Calibration Notes
· To fully calibrate the standard 4 (combustible gas, O2, CO, H2S) and super toxic sensors, you must do a fresh air adjustment (AIR CAL) and a span adjustment (AUTO CAL).
· To fully calibrate the IR CO2 sensor, you must do either a) a fresh air adjustment (AIR CAL) and a span adjustment (AUTO CAL) or b) a zero adjustment (CO2 ZERO CAL) and a span adjustment (AUTO CAL).
· Bump test the instrument before each day’s use with a known concentration of each target gas. A bump test can be done in User Mode’s BUMP TEST item or by applying gas in Measuring Mode. The instrument does not need to be calibrated unless it does not pass the User Mode bump test or does not respond appropriately, as defined by the user, in Measuring Mode.
· The hydrogen response for the H2-compensated CO sensor needs to be calibrated monthly and when the sensor is replaced.
Performing a Fresh Air Adjustment (AIR CAL)
1. Find a fresh air environment, an environment of normal oxygen content (20.9%) that is free of toxic and combustible gases.
2. While in User Mode, use AIR to place the cursor next to GAS CAL.
MAINTE 7:49
BUMP TEST GAS CAL CAL SETTING USER MODE
3. Press and release POWER MODE. The Gas Cal menu appears.
4. Use AIR to place the cursor next to AIR CAL.
MAINTE 7:49
AIR CAL CO2 ZERO CAL AUTO CAL GAS CAL

GX-3R Pro (TIIS Version) Operator’s Manual

Chapter 5: User Mode an

References

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