RKI INSTRUMENTS GX-3R Pro Five Gas Monitor Confined Space Detector Instruction Manual
- June 6, 2024
- RKI INSTRUMENTS
Table of Contents
- RKI INSTRUMENTS GX-3R Pro Five Gas Monitor Confined Space Detector
- Specifications
- Product Description
- Product Usage Instructions
- Frequently Asked Questions
- Introduction
- Description
- Operation
- Display Mode
- User Mode and Calibration
- References
- Read User Manual Online (PDF format)
- Download This Manual (PDF format)
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?
- A: You can register your product by visiting the manufacturer’s website at www.rkiinstruments.com/registration and following the provided instructions.
- 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.
16 · Chapter 2: Description
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.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 3: Operation · 25
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
GX-3R Pro (TIIS Version) Operator’s Manual
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.
GX-3R Pro (TIIS Version) Operator’s Manual
Chapter 3: Operation · 29
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.
GX-3R Pro (TIIS Version) Operator’s Manual
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
GX-3R Pro (TIIS Version) Operator’s Manual
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.
GX-3R Pro (TIIS Version) Operator’s Manual
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.
36 · Chapter 3: Operation
GX-3R Pro (TIIS Version) Operator’s Manual
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.
GX-3R Pro (TIIS Version) Operator’s Manual
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
38 · Chapter 3: Operation
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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
GX-3R Pro (TIIS Version) Operator’s Manual
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.
40 · Chapter 3: Operation
GX-3R Pro (TIIS Version) Operator’s Manual
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.
GX-3R Pro (TIIS Version) Operator’s Manual
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.
42 · Chapter 3: Operation
GX-3R Pro (TIIS Version) Operator’s Manual
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.
GX-3R Pro (TIIS Version) Operator’s Manual
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
44 · Chapter 3: Operation
GX-3R Pro (TIIS Version) Operator’s Manual
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.
GX-3R Pro (TIIS Version) Operator’s Manual
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.
46 · Chapter 3: Operation
GX-3R Pro (TIIS Version) Operator’s Manual
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.
GX-3R Pro (TIIS Version) Operator’s Manual
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.
48 · Chapter 4: Display Mode
GX-3R Pro (TIIS Version) Operator’s Manual
· 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.
GX-3R Pro (TIIS Version) Operator’s Manual
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.
50 · Chapter 4: Display Mode
GX-3R Pro (TIIS Version) Operator’s Manual
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
GX-3R Pro (TIIS Version) Operator’s Manual
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
52 · Chapter 4: Display Mode
GX-3R Pro (TIIS Version) Operator’s Manual
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.
GX-3R Pro (TIIS Version) Operator’s Manual
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
54 · Chapter 4: Display Mode
GX-3R Pro (TIIS Version) Operator’s Manual
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
GX-3R Pro (TIIS Version) Operator’s Manual
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
56 · Chapter 4: Display Mode
GX-3R Pro (TIIS Version) Operator’s Manual
Alarm Points Screen (ALARM POINTS)
The Alarm Points Screen shows the gas alarm settings for all active channels.
- 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.
GX-3R Pro (TIIS Version) Operator’s Manual
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.
58 · Chapter 4: Display Mode
GX-3R Pro (TIIS Version) Operator’s Manual
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.
GX-3R Pro (TIIS Version) Operator’s Manual
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.
60 · Chapter 4: Display Mode
GX-3R Pro (TIIS Version) Operator’s Manual
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.
GX-3R Pro (TIIS Version) Operator’s Manual
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.
62 · Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
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
GX-3R Pro (TIIS Version) Operator’s Manual
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.
64 · Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
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.
GX-3R Pro (TIIS Version) Operator’s Manual
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.
66 · Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
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.
GX-3R Pro (TIIS Version) Operator’s Manual
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.
68 · Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
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.
GX-3R Pro (TIIS Version) Operator’s Manual
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.
70 · Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
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
GX-3R Pro (TIIS Version) Operator’s Manual
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.
72 · Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
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.
GX-3R Pro (TIIS Version) Operator’s Manual
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.
74 · Chapter 5: User Mode and Calibration
GX-3R Pro (TIIS Version) Operator’s Manual
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
- RKI Gas Detectors - Portable Gas Monitors - LEL, PID, H2S, CO, O2 Sensors
- Product Registration | RKI
- RKI Gas Detectors - Portable Gas Monitors - LEL, PID, H2S, CO, O2 Sensors
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