TROLEX TX6353.03 Infrared Gas Sensor Detector User Manual

TROLEX TX6353.03 Infrared Gas Sensor Detector

Product Overview

TX6353.03
Sentra P Open Protocol gas detector 12 V dc – intrinsically safe Mining and Tunnelling

TX6353.04
Sentra P Open Protocol gas detector 24 V dc – General Purpose

Operating Features

• High-accuracy gas detector with serial data output configured for open network integration, on newly installed or existing data networks
• Pre-calibrated plug-in gas sensing module can be replaced in seconds for ease of calibration and maintenance
• The large backlit LCD screen provides a concise menu-driven calibration guide and sensor diagnostics
• Two inbuilt LED alarm indicators for General and High alarms with programmable setpoints
• Auxiliary analogue output signal to drive a local audio-visual alarm unit when required
• Power supply voltage level data is transmitted over the RS485 Modbus for constant monitoring
• Certified intrinsically safe for 12 V dc operating areas

Application
Fixed point gas detection for safety monitoring in hazardous areas and general-purpose applications; for applications on data communication networks.

• Intrinsically Safe: TX6353.03
• Supply Voltage: 12 V dc from an approved intrinsically safe power source
• General Purpose: TX6353.04
• Supply Voltage: 24 V dc

Product Options

• TX6353 SentrO P
  • 12 V dc
  • 24 V dc
• Intrinsically Safe Mining and Tunnelling Ex
  • TX6353.03
  • –
• General Purpose
  • –
  • TX6353.04

Dimensions

Technical Information

TX6353.03 TX6353.04

Intrinsically Safe Mining     General Purpose and Tunnelling Ex

Supply voltage| 12 V dc                              24 V dc
Supply voltage range| 7.5 to 14.4 V dc                   7.5 to 28 V dc
Current consumption| electrochemical cell 20 mA electrochemical cell 15 mA pellistor cell 55 mA            pellistor cell 30 mA
Current consumption with backlight| electrochemical cell 25 mA electrochemical cell 20 mA pellistor cell 60 mA            pellistor cell 35 mA
Output signal| RS485 Modbus
Auxiliary alarm output signal| 0.4 to 2.0 V analogue output signal proportional to the measured gas concentration value, for powering

a suitable local audio-visual alarm unit

Gases detected| Carbon monoxide at 0 to 50 ppm Hydrogen sulphide at 0 to 50 ppm Methane at 0 to 4% v/v

Nitric oxide at 0 to 50 ppm Nitrogen dioxide at 0 to 20 ppm

Oxygen at 0 to 25% v/v

eModule working life| Minimum 2 years, dependent upon module type and monitoring conditions
Operating temperature range| -10 to +40°C
---|---
Storage temperature| -20 to +60°C
Humidity| 90% non-condensing
Housing materials| Reinforced polymer. EMC protected and proof against surface electrostatic charge
Protection classification| Housing dust and waterproof to IP65 Gas port protected to IP54
Weight| 550 g
Mounting| Two 6.5 mm diameter fixing holes with Unistrut 6946 indents
Cable entries| 2 x M20
Electrical connections| 4 mm barrier/clamp terminals with circuit segregation barriers
Conductors| A maximum of two per terminal
Conductor size| A maximum of 2 x 2.5 mm²
Terminal torque| 2.4 Nm maximum
Information display| 128 x 65 dot graphic LCD screen (Backlit)
Vibration limits (EN 61779)| 10 to 200 Hz, 7g peak
Impact limits| 20 joules (housing)
Calibration and setup| Digitally controlled Zero and Span pushbutton setting
Signal fix| The transmitted output signal of the sensor is Fixed during calibration to prevent false alarms from being initiated
Fault indication| The under-range signal transmitted and Fault display for:

•     Loss of communication between sensing eModule and transmitter

•     Critical reduction in sensor sensitivity

•     Sensor over-range protection

Alarms| Inbuilt adjustable visual alarm LEDs for General and High alarms. Programmable setpoints and options selectable from the setup menus

Electrical Details

TX6353.03 TX6353.04

Output signal| RS485
Supply voltage| 7.5 to 14.4 V dc                7.5 to 28 V dc
Supply current no backlight: electrochemical sensor pellistor sensor|

20 mA                            15 mA

55 mA                            30 mA

RS485 protocol| Modbus to system requirements

Auxiliary Output for Powering a Local Audio Visual Alarm

• Output signal 0.4 to 2 V for the measured gas concentration
• Minimum line load 10 Kohm
• Power for the audio-visual alarm can be supplied from the sensor

Checkpoint
The TX6353 12 V dc version of the sensor is certified intrinsically safe and may be located in the hazardous area when used in conjunction with approved intrinsically safe apparatus.

Sentro modules
Plug-in pre-calibrated eModules with standardised output data.

• Each eModule stores all the necessary data about its type identification, sensing range and specific calibration. This data is automatically recognised by SentrO P when the module is loaded into the module bay.
• The eModules are pre-calibrated so can be substituted at any time by a replacement eModule – usually of the same type, but an alternative may be inserted if required.
• The sensing eModule will identify itself when plugged into the sensor housing and auto-configuration will take place.
• All Sentro eModules have two output alarm signals for the General alarm and the High alarm. Default values are entered during manufacture and these can be changed to preferred values.
• The General and High alarm signals illuminate built-in flashing LED indicators located at the right-hand side of the LCD screen window.

Sentro eModules
For the full range of Sentro eModules contact the Trolex Sales Team: sales@trolex.com

Flammable Gases • Poison Resistant Catalytic Sensor
The sensor will respond to most flammable gases and vapours to varying degrees; it is calibrated to methane in terms of %volume.

TX6350|  | .01.246.DP

Methane CH4

---|---|---
Sensing element| Poison| resistant pellistor with active temperature/humidity compensation
Sensing range| 0 to 4% v/v
Linearity| Linear to 3% v/v, 3% to 4% ±0.25% v/v
Max. Drift @ 25°C| ±0.25% CH4 v/v per month
Response time (T63)| <15 secs
Response time (T90)| <20 secs
Sensing element life| >5 years in clean atmosphere
Warm up time| <5 mins in air or 1% v/v CH4 (to 95% of stated accuracy)
GENERAL alarm| 10% LEL (0.44% v/v)
HIGH alarm| 20% LEL (0.88% v/v)

Checkpoint
The pellistor is automatically protected against exposure to excessively high concentrations of gas.

Toxic Gases • Electrochemical Cells

TX6350| .01.250.50.

DP

Carbon Monoxide CO

| .01.251.DP

Hydrogen Sulphide

H2S

| .01.257

Oxygen O2

| .01.254.DP .01.259.DP

Nitrogen              Nitric

Dioxide              Oxide

NO2                              NO

---|---|---|---|---
Sensing element|  |  |  | Ele| electrochemical| cell
Sensing range| 0| to 50 ppm| 0| to 50 ppm| 0 to 25% v/v| 0| to 20 ppm| 0| to 50 ppm
Linearity| ±2% FS| ±2% FS| ±5% FS| ±2% FS| ±5% FS
Drift| 2% per month| 2% per month| 10% per year| 2% per month| 2% per month
Repeatability|  | ±2%|
Response time T63%| ****

<20 secs

| ****

<30 secs

| ****

N/A

| ****

<20 secs

| ****

<20 secs

Operating life| 2 years| 2 years| 2 years| 2 years| 2 years
Relative humidity|  | 15 to 90% non-condensing|
Operating temperature|  | -10 to +40°C|
GENERAL

alarm

| 15 ppm| 5 ppm| 19% (under)| 5 ppm| 5 ppm
HIGH alarm| 30 ppm| 10 ppm| 23% (over)| 10 ppm| 20 ppm

Checkpoint
All values listed are nominal and slight variations may occur depending upon operating conditions.

• The natural level of oxygen available in the atmosphere is influenced by relative humidity and temperature. The oxygen sensor will react to these changes.
• Sudden changes in atmospheric pressure will also cause temporary instability in electrochemical sensors.
• Long periods of use in extremely high or low humidity may affect the response of the sensor and shorten the life of electrochemical sensors.
• Gas sensing eModule type TX6351.259.DP (nitric oxide) must be constantly powered-up to maintain calibration stability. If the eModule is powered-down for more than 10 minutes, it could take 24-48 hours before stability is restored. Do not calibrate until the output signal is steady.

Certification

Pennsylvania State

Pennsylvania:
Pennsylvania Department of Environmental Protection – Bureau of Mine Safety approved. Approval number: BOTE 63-13 24 V variant only

MSHA

Approved eModules:
The TX6353 SentrO P can only be used with the following eModules:

Electrochemical cells
TX6350.01.250.50.DP – Carbon Monoxide CO – 0 to 50 ppm TX6350.01.251.DP – Hydrogen Sulphide H2S – 0 to 50 ppm TX6350.01.257 – Oxygen O2 – 0 to 25% v/v TX6350.01.259.DP – Nitric Oxide NO – 0 to 50 ppm TX6350.01.254.DP – Nitrogen Dioxide NO2 – 0 to 20 ppm Poison resistant pellistor: TX6350.01.246.DP – Methane CH4 – 0 to 4% v/v

Conditions of Use

1. Power for the TX6353 SentrO-P must be derived from a supply previously evaluated by MSHA, a maximum output of 14.4 Vdc open-circuit voltage and 3.3 A short circuit current.
2. Do not disassemble the TX6353 SentrO P in an area where permissibility is required, except to change the eModule.
3. The TX6353 SentrO-P must not be used as an air quality detector.
4. Until such time it is tested for performance and listed by a Nationally Recognized Test Laboratory, the TX6353 SentrO P is not accepted by MSHA for compliance with 30 CFR 75.351 or 75.1103.

Installing

Safety Precautions

Hazardous Areas
Do not disassemble the sensor whilst in the hazardous area or use a sensor that has damaged housing in the hazardous area.

Evacuation
If a dangerous level of gas concentration is detected by the instrument, leave the area immediately.

Operating Life of Gas Sensors
Electrochemical cells contain an electrolyte that is gradually consumed during use. The average life is about two years, depending upon the duty cycle. The response should be checked at regular intervals. Refer to Section 5 for details of Maintenance to be carried out on the SentrO P.

Sensitivity
Electrochemical cells for toxic gases can be affected by other interfering gases which may displace the subject gas being monitored. Steam-laden atmospheres and condensation can also reduce the sensitivity.

Flammable
Be aware that some toxic gases are also ‘flammable’ at high percentage concentrations.

Operating Limits of Catalytic Combustion Sensors
Catalytic combustion gas sensors positively detect the presence of flammable gas. They rely upon the presence of oxygen in the atmosphere and should only be used for gas concentrations up to the Lower Explosive Limit (LEL). After this point, the output becomes non-linear and may erroneously indicate that the gas concentration is below the LEL. They should not be used in oxygen- enriched or deficient atmospheres.

Discrimination
Catalytic combustion sensors can detect a wide range of flammable gases but they cannot discriminate between individual gases. They will respond to most, or all, of the flammable components present in the atmosphere without distinguishing between them. Infrared sensors are highly specific to the defined gas type and may NOT respond to other similar gases.

Contamination
The response of catalytic combustion gas sensors can be affected by airborne contaminants which will reduce the sensitivity. Substances such as silicones, tetraethyl lead, sulphur compounds and phosphate esters can cause permanent degradation
(poisoning). Hydrocarbons may also cause temporary inhibition.

Interference
If the atmosphere to be monitored contains a gas that dilutes or displaces the air, this may reduce the response of catalytic sensors. Similarly, steam-laden atmospheres and condensation can reduce the stability.

High Concentrations of Flammable Gas
Exposure of low-concentration catalytic combustion sensors to concentrations of flammable gas greater than the LEL can affect the sensitivity and zero stability of catalytic elements and the calibration should be checked after such an exposure.

Toxicity
Be aware that most flammable gases and vapours are also toxic at low concentrations of LEL.

Tools and Test Equipment Required
No special tools are needed.

Siting Recommendations

Location of Gas Detectors
Each installation needs to be considered in its own right, regarding safety authorities and in compliance with mandatory local safety regulations. The sensor must be operated under the User Manual to maintain safety, and reliability and to preserve safety integrity where applicable. Sensors must be located in positions determined in consultation with those who have specialised knowledge of the plant or installation and of the principles of gas dispersion. Reference should also be made to those responsible for the engineering layout and topology of the plant as they will be most familiar with the nature of the potential dangers and the most likely sources of gas release. It is also important to recognise that the characteristics of the gas source can be influenced by many factors; including the relative density or buoyancy of the gas, the pressure at the point of release, the ambient temperature and the ventilation of the site. Sensor coverage cannot be simply expressed in terms of ‘number per unit area’. Sensors need to be sited where they are capable of monitoring those parts of a plant where gas may accumulate or where a source of gas release is expected to occur. This way, the earliest possible warning of a gas release can be given to initiate shutdown functions, alarm functions or safe evacuation of the premises.

Sensor Management
A very important part of an efficient gas monitoring system is the training of plant personnel in operation and maintenance of the sensors and the complete monitoring system. Training can be provided by qualified Trolex application engineers. Once a sensor installation is complete, the sensor locations and types should be formally recorded and a planned test and maintenance procedure instituted.

Connections

RS485 Data Output Signal
Use in conjunction with a PC for data display and setpoint alarm warnings. Up to 32 sensors acting as slaves can communicate with the master unit on a single data cable.

Recommended cable for locally powered sensors:

• 1 twisted pair
• 0.5 mm2
• Overall screen

Recommended cable for sensors that are powered through the data cable:

• 2 twisted pair
• 0.5 mm2
• Individual/overall screen

Auxiliary Output Signal
The 0.4 to 2 V output can be used to trigger an external audio/visual alarm. The output is proportional to the gas level detected.

Setup and Calibration

Controls and Indicators

Main Display

Checkpoint
To use the SentrO P software and navigate between Function menus you must press the setup keys: Next is the Left key – L Select/Change is the Right key – R. The use of these keys is abbreviated to L and R throughout this User Manual. To access the L (Next) and R (Select/Change) buttons you need to remove the front cover. Use a cross-head screwdriver to remove the four screws securing the front cover and hinge it out of the way.

Function Menus

Setup and Calibrate

Start-up Screen
When the SentrO P is initially powered up, the Start Screen will be displayed for a few seconds. The Start Screen displays basic information about the SentrO P including the main software version, system date, system time, driver versions and output formats.
During the initial power-up, the SentrO P will gather system readings and interrogate the Sentro eModule to identify the type of gas and the calibrated measuring range.

Main Display
Once the initial power-up is complete, the screen will show the Main Display. The Main Display shows the gas type, level and measuring range of gas being detected.

Main Menu
From the Main Display press and hold L, this will display the Main Menu. From the Main Menu, the operating parameters of the sensor may be set up according to preference. The available menus are as follows:

• Calibrate
• TX6353 Setup
• Output Setup
• Module Setup
• Exit

Checkpoint
You can safely remove the front cover of the SentrO P for setup in a hazardous area, even with the power applied.

Checkpoint
The SentrO P will automatically return to the Main Display if no keys are pressed within 30 seconds. The time limit is extended to 8 minutes during Calibrate to allow the gas value displayed on the LCD screen time to stabilise.

Calibrate

Calibrate
Calibrate the Zero and Span values of the SentrO P using clean air and a test gas of a known concentration.

Checkpoint
Ensure the area where the equipment is being calibrated is well ventilated. Observe appropriate Health and Safety legislation and applicable local procedures when handling test gases.

• From the Main Menu press L to navigate to Calibrate. Press R to enter the Calibrate Menu.
• The screen will show an arbitrary reading.

Using the appropriate Trolex test gases, connect the application tube from the clean air to the gas entry port. Open the valve and apply clean air at a rate of 0.5 litre/min. Wait for the reading to settle at a stable value. Press R to Zero the displayed value. Wait for the reading to stabilise at zero. Shut the valve and stop the supply of clean air. Disconnect the application tube from the gas entry port. Press R to go to Calibrate Span.

Checkpoint
Press L at any time to Quit and return to the Main Display.

Calibrate Span – Using Test Gas of Current Value
The screen will show the concentration of Span Gas that is expected to be used. Check the value of Span Gas displayed and compare it against the value shown on the test gas cylinder. If the values match press R. Using the appropriate test gas, connect the application tube from the test gas to the gas entry port.

Open the valve and apply Span Gas at a rate of 0.5 litre/min. Wait for the reading to settle at the stable value (Not necessarily the Span Gas value). Press L and Span the displayed value. If the displayed value continues to shift press L again. Shut the valve and stop the supply of test gas. Disconnect the application tube from the gas entry port.

Checkpoint
Press L and R together at any time to Quit and return to the Main Menu.

Calibrate Span – Using Test Gas of a Different Value

• The screen will show the concentration of Span Gas that is expected to be used.
• Check the value of Span Gas displayed and compare it against the value shown on the test gas cylinder. If the values do not match press L.
• Press L to increment each digit.
• Press R to navigate to the next digit.
• When the last digit is set, press R to select Done and return to the Calibrate Menu.
• Continue with Calibrate Span as described in the previous section.

Checkpoint
The indication will be given if a gas-sensing eModule reaches the limit of available adjustment.

TX6353 Setup
Setup the basic operating functions of the SentrO P sensor. From the Main Menu press L to navigate to TX6353 Setup. Press R to enter the TX6353 Setup Menu.

The available menus are as follows:

• System Information
• Display Setup
• Alert Setup
• Set Security Code
• Simulate Gas Concentrations
• Read/Write Registers
• 12 V/24 V Setup
• Exit

System Information
This displays basic information about the system including the main software version, system date, system time, driver versions and output formats.

Display Setup Menu Set Backlight

• The screen backlight illumination may be set to On or Off, to reduce power consumption.
• From the Display Setup Menu press L to navigate to Set Backlight. Press R to enter the Set Backlight Menu.
• From the Set Backlight Menu press R to set the Backlight Illumination to On or Off as required.
• Press L to navigate to Save or Cancel as required. Press R to confirm the selection and return to the Display Setup Menu.

Adjust Contrast

• The contrast of the screen may be set for best visual appearance.
• From the Display Setup Menu press L to navigate to Adjust Contrast. Press R to enter the Set Display Contrast Menu.
• Press L to navigate to Increase or Decrease as required. Press R to Increase or Decrease the contrast as required. Press L to navigate to Save or Cancel as required. Press R  to confirm the selection and return to the Display Setup Menu.

Alert Setup Menu Visual Alert

• The integral General and High visual alarms can be set to On or Off.
• From the Alert Setup Menu press L to navigate to Visual Alert. Press R to enter the Visual Alert Menu.
• From the Visual Alert Menu press R to set the Visual Alert to On or Off as required.
• Press L to navigate to Save or Cancel as required. Press R to confirm the selection and return to the Alert Setup Menu.

Confidence Alarm

• If the Confidence Alarm has been enabled it will flash every 15 seconds to indicate that the SentrO P is working normally. The Confidence Alarm flash can be set to On or Off.
• From the Alert Setup Menu press L to navigate to Confidence Alarm. Press R to enter the Confidence Alarm Menu.
• From the Confidence Alarm Menu press
• R to set the Visual Alert to On or Off as required.
• Press L to navigate to Save or Cancel as required. Press R to confirm the selection and return to the Alert Setup Menu.

Set Security Code

• A four digit security code can be entered to prevent unauthorised access to the Main Menu.
• From the TX6353 Setup Menu press L to navigate to Set Security Code. Press R to enter the Set Security Code Menu.
• From the Set Security Code Menu press R to increment the first digit. Press L to confirm the selection and navigate to the next digit.
• Repeat for all four digits. Press L to navigate to Enter or Cancel as required. Press R  to confirm the selection and return to the TX6353 Setup Menu.

Simulate Gas Concentration
For the purposes of system testing a simulated gas concentration value can be manually entered. From the TX6353 Setup Menu press L to navigate to Simulate Gas Conc. Press R to enter the Simulate Gas Concentration Menu. Press L to select the first digit. Press L to increment the first digit. Press R to confirm the selection and navigate to the next digit. Repeat for all three digits and press R to confirm. Press R to save the entered values.

Read/Write Registers
Read/Write Registers describe the content of the RS485 Modbus communication. They are available to view. Some of the Read/Write Registers can also be adjusted to suit preference.

Checkpoint
Refer to the SentrO P Configuration Guide TX6353-CG-EN for full details of RS485 Modbus configuration From the TX6353 Setup Menu press L to navigate to Read/Write Registers. Press R to enter the Read/Write Registers Menu. The list of Read/Write Registers is as follows:

• 40001: Raw Gas Reading
• 40002: Status 1
• 40003: Voltage
• 40004: Status 2
• 40005: Control – adjustable
• 40006: Range
• 40007: Units
• 40008: Gas Type
• 40009: Serial Number 1
• 40010: Serial Number 2
• 40011: User Data 1 – adjustable
• 40012: User Data 2 – adjustable
• 40013: Address
• 40014: User Data 3 – adjustable
• 40015: User Data 4 – adjustable
• 40016: User Data 5 – adjustable
• 40017: Low Volt Thresh – adjustable
• Exit

Press L to navigate through the Read/Write Registers. Press R to select the Read/Write Register and enter it for viewing.

Raw Gas Reading
Displays the system Raw Gas Reading.

Status 1
Displays Status 1. This is the setup of the functional characteristics of the sensor.

Voltage
Displays the system measured Voltage in numerical form with a value between 0 and 32767 displayed. The value is proportional corresponding to the supply voltage between 0 and 30 V. A value of 0 = 0 V and a value of 32767 = 30 V dc

Status 2
Displays Status 2. This is the setup of the basic configuration of the sensor.

Control
Displays the current system Control. User adjustable between -32768 and +32767.

Control – continued
Press L to navigate to Adjust. Press R to select Adjust. Press L to navigate the digits and press R to increment the digits. Press L to navigate to Enter or Cancel as required. Press R to confirm the selection.

Range
Displays the eModule gas measuring Range.

Units
Displays the eModule Units of gas measurement.

Gas Type
Displays the eModule Gas Type – 0 denotes carbon monoxide.

Serial Number 1
Displays the eModule Serial Number 1.

Serial Number 2
Displays the eModule Serial Number 2.

User Data 1
Displays eModule User Data 1. User adjustable between -32768 and +32767.

Checkpoint
User Data 1 to 5 are memory locations for entry of user defined data.

Press L to navigate to Adjust and press R to select Adjust. Press L to navigate the digits and press R to increment the digits. Press L to navigate to Enter or Cancel as required. Press R to confirm the selection.

User Data 2
Displays eModule User Data 2. User adjustable between -32768 and +32767. Press L to navigate to Adjust and press R to select Adjust. Press L to navigate the digits and press R to increment the digits. Press L to navigate to Enter or Cancel as required. Press R to confirm the selection.

Address
Displays the current Address of this sensor.

User Data 3
Displays system User Data 3. User adjustable between -32768 and +32767. Press L to navigate to Adjust and press R to select Adjust. Press L to navigate the digits and press R to increment the digits. Press L to navigate to Enter or Cancel as required. Press R to confirm the selection.

User Data 4
Displays User Data 4. User adjustable between -32768 and +32767. Press L to navigate to Adjust and press R to select Adjust. Press L to navigate the digits and press R to increment the digits. Press L to navigate to Enter or Cancel as required. Press R to confirm the selection.

User Data 5
Displays User Data 5. User adjustable between -32768 and +32767. Press L to navigate to Adjust and press R to select Adjust. Press L to navigate the digits and press R to increment the digits. Press L to navigate to Enter or Cancel as required. Press R to confirm the selection.

Low Voltage Threshold
This sets the supply under-voltage threshold. By default this value is +32767 which disables this feature.3

Checkpoint
The value is ranged from 0 to +32767 corresponding to 0 to 30 V. Press L to navigate to Adjust and press R to select Adjust. Press L to navigate the digits and press R to increment the digits. Press L to navigate to Enter or Cancel as required. Press R to confirm the selection.

12V / 24V Setup
This indicates over the Modbus and on the LCD screen if the unit is a 12 V or 24 V supply version. From the TX6353 Setup Menu press L to navigate to 12V / 24 V Setup. Press R to enter the 12V / 24V Setup Menu. The LCD screen will display if the unit is a 12 V or 24 V supply version. Press R to return to the TX6353 Setup Menu.

Exit
From the TX6353 Setup Menu press L to navigate to Exit. Press R to confirm the selection and return to the Main Menu.

Output Setup
View information on and setup characteristics of the SentrO P output signal. From the Main Menu press L to navigate to Output Setup. Press R to enter the Output Setup Menu.

The available menus are as follows:

• Modbus Address
• Baud Rate
• TxOn Delay
• TxOff Delay
• Parity
• Comms Indicator
• Exit

Modbus Address
The Modbus Address can be set between 1 and 255 as required.  From the Output Setup Menu press L to navigate to Modbus Address. Press R to enter the Set Modbus Address Menu. Press L to navigate to Increase or Decrease as required. Press R to Increase or Decrease the Modbus Address as required. Press L to navigate to Save or Cancel as required. Press R to confirm the selection and return to the Output Setup Menu.

Baud Rate
The Baud Rate can be set to 300/600/1200/2 400/4800/9600/14400/19200/28800/38400/ 57600/115200 as required. From the Output Setup Menu press L to navigate to Baud Rate. Press R to enter the Set Baud Rate Menu.

Press R to navigate to the required Baud Rate. Press L and select Save or Cancel as required. Press R to confirm the selection and return to the Output Setup Menu.

TxOn Delay and TxOff Delay

• The TxOn Delay and TxOff Delay can be set between 0 and 99 ms.
• From the Output Setup Menu press L to navigate to TxOn Delay or TxOff Delay as required. Press R to enter the TxOn Delay or TxOff Delay Menu as required.
• Press L to navigate to Increase or Decrease as required. Press R to Increase or Decrease as required. Press L to select Save or Cancel as required. Press R to confirm the selection and return to the Output Setup Menu.

Parity
The Parity can be set to None (0), Odd (1) or Even (2). From the Output Setup Menu press L to navigate to Parity. Press R to enter the Set Parity Menu. Press R to set the Parity to None (0), Odd (1) or Even (2) as required. Press L to select Save or Cancel as required. Press R to confirm the selection and return to the Output Setup Menu.

Comms Indicator
The Comms Indicator can be set to On or Off as required.

Checkpoint
The Comms Indicator shows on the LCD screen if the SentrO P is transmitting (T) or receiving (R) information from the Modbus.

• From the Output Setup Menu press L to navigate to Comms Indicator. Press R to enter the Set Comms Indicator Menu.
• Press R to set the Comms Indicator On or Off as required. Press L to select Save or Cancel as required. Press R to confirm the selection and return to the Output Setup Menu.

Exit
From the Output Setup Menu press L to navigate to Exit. Press R to confirm the selection and return to the Main Menu.

Module Setup
Setup the functional values of the Sentro eModule. From the Main Menu press L to navigate to Module Setup press R to enter the Module Setup Menu.

The available menus are as follows:

• Setpoint 1
• Setpoint 2
• Exit

Setpoint 1 and Setpoint 2
From the Module Setup Menu press L to navigate to Setpoint 1. Press R to enter the Change Setpoint 1 Menu.

Activation
Setpoint 1 and Setpoint 2 can be configured to be activated by a gas concentration value going Over or falling Under a user-defined level.

Checkpoint
Setpoint 2 activation is configured in exactly the same way as Setpoint 1 activation.From the Change Setpoint 1 Menu press L to navigate to Activation. Press R to enter the Activation Menu.

• Press R to select Under or Over as required.
• Press L to select Save or Cancel as required.
• Press R to confirm the selection and return to the Change Setpoint 1 Menu.

Level

• The level at which Setpoint 1 and
• Setpoint 2 are activated can be configured.

Checkpoint

• Setpoint 2 activation level is configured in exactly the same way as Setpoint 1.
• From the Change Setpoint 1 Menu press L to navigate to Level. Press R to enter the same way as Setpoint 1.

Level Menu.

• Press R to increment the digits as required.
• Press L to navigate to the next digit. Repeat for all three digits and press L.
• Press L to select Save or Cancel as required.
• Press R to confirm the selection and return to the Change Setpoint 1 Menu.

Exit
From the Change Setpoint 1 Menu press L to navigate to Exit. Press R to confirm the selection and return to the Module Setup Menu.

Exit
From the Module Setup Menu press L to navigate to Exit. Press R to confirm the selection and return to the Main Menu.

Exit
From the Main Menu press L to navigate to Exit. Press R to confirm the selection and return to the Main Display.

Support
If you need technical support to operate this product or would like details of our after-sales technical support packages, please contact your local Trolex service agent or service@trolex.com.

Diagnostics and Maintenance

Diagnostic Messages

Sensor Over-range
If the SentrO P detects gas levels above its prescribed range an error message will be shown.

Loss of Signal From the Sensor
If there is a loss of signal from the eModule to the SentrO P an error message will be shown.

Module Not Fitted
If the eModule has been removed from the SentrO P and is out for more than 10 seconds an error message will be shown.

Maintenance

Introduction
To keep your SentrO P in the best possible condition and minimise downtime, Trolex strongly recommends that you carry out regular planned preventative maintenance and keep records of the maintenance carried out. The planned preventative maintenance for SentrO P consists of a number of tasks carried out at regular intervals on a cumulative basis, ie at 12 months do the 1 month jobs AND the 12 month jobs. These tasks are listed in the maintenance schedule below:

Equipment Name| Task Type| Task Number|

Interval

---|---|---|---
SentrO P gas inlet port| Check and Clean| 5.2.2| 1 month
SentrO P| Bump Test| 5.2.3| 1 month
Sentro eModules| Calibrate| 5.2.4| 6 months
SentrO P| Safety Check| 5.2.5| 12 months
Sentro eModules|  | Replace| 5.2.6|
 | Carbon monoxide|  |  | 24 months
 | Hydrogen sulphide|  |  | 24 months
 | Methane – pellistor

Nitric oxide Nitrogen dioxide

Oxygen

|  |  | 60 months

24 months

24 months

24 months

Checkpoint
After the completion of all maintenance, update the maintenance records.

SentrO P Gas Inlet Port – Check and Clean

1. Check the condition of the gas inlet port and repair or replace as necessary.
2. Clean the gas inlet port with a small brush to remove dust and debris.
3. After the completion of all maintenance, update the maintenance records.

SentrO P – Bump Test

1. With the SentrO P powered up, note the background gas level on the LCD screen.
2. Spray a 10-second burst of test gas on to the gas port.
3. On the LCD screen check that the gas concentration reading rises and then falls back to the background level. This may take up to 25 seconds from the end of the burst of test gas.
4. After the completion of all maintenance, update the maintenance records.

Checkpoint
If the SentrO P fails the above test, replace the defective eModule with a working eModule of the same type and repeat the bump test on the replaced eModule.

Sentro eModules – Calibrate

1. Calibrate the Sentro eModules per the instructions in section 4.4.4.
2. Replace any eModules that fail the calibration.
3. After the completion of all maintenance, update the maintenance records.

SentrO P – Safety Check

1. Check the exterior of the SentrO P for any signs of damage. If the SentrO P shows any signs of damage, deformation or missing parts, immediately remove it from service and replace it with a working SentrO P. Return the defective SentrO P to your local Trolex service agent for repair and testing.

OR

1. Return you SentrO P to the Trolex Product Support Department for a safety check.
2. After the completion of all maintenance, update the maintenance records.

Sentro eModules – Replace

1. The Sentro eModule should be changed at regular intervals to ensure the accuracy of response.
2. Service history is logged within the eModule and this data is used to periodically assess its condition whenever it is returned for servicing.
3. Simply undo the screws, open the front cover, remove the old eModule, insert the new eModule into the SentrO P, fit the cover, tighten the screws and return the removed eModule for checking and calibration.
4. After the completion of all maintenance, update the maintenance records.

Checkpoint
The periodicity for eModule replacement is approximate and depends upon the eModule type and monitoring conditions. Gaining knowledge and experience of the condition of an eModule when it is replaced will enable you to fine tune this periodicity to suit your location.

Recommended Test Gas Concentrations

Standard test gas canisters are available from our Product Support department and can be supplied in a range of capacities from 34 litres up to 110 litres. Please contact your local Trolex service agent or service@trolex.com for advice regarding recommended test gas procedures and product support plans.

Checkpoint
The calibration gas shown is the recommended level of concentration. Any concentration gas down to 50% of full scale can be utilised for accurate calibration.

eModule Type and Range

| Carbon monoxide 0 to 50 ppm| Hydrogen sulphide 0 to 50 ppm| Methane 0 to 4% v/v| Methane 0 to 100%

v/v

| Oxygen 0 to 25% v/v
---|---|---|---|---|---
Zero Gas| Clean air| Clean air| Clean air| Clean air| Clean air

Span Gas

|

CO

50 ppm

|

H2S

50 ppm

| CH4

4% v/v in

balanced air

|

CH4

5% v/v

|

O2

25% v/v

Checkpoint
25% Oxygen cannot be shipped by air transport, so a concentration below 23% would be supplied.

Disposal
Part of the ethos of Trolex is sustainable design. SentrO P contains materials that can be recovered, recycled and reused. At the end of its useful life ensure that the SentrO P is recycled in accordance with local laws and bylaws for the geographic area where it is located. The end of its useful life is to be determined by the owner/operator of the equipment and not Trolex. Ensure that the SentrO P is recycled by licenced waste contractors with the appropriate licences for handling electronic waste in the geographic area where the SentrO P is located.

Checkpoint
Consult your local Trolex service agent or the Trolex Product Support Department if you require assistance with disposal: service@trolex.com

Maintenance Records
Implement a planned preventative maintenance process and keep good maintenance records. Consult your local Trolex service agent or the Trolex Product Support Department: service@trolex.com for help in implementing a planned preventative maintenance process. The ‘Maintenance Log’ gives an example of a typical maintenance record system.

Maintenance Log

Order Reference: TX

Serial Number:| Date Purchased:
Gas Type:| Location:
Date| Scheduled Check| Fault| Recalibrate| Change eModules| Return to Trolex| Comments
---|---|---|---|---|---|---
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Disclaimers

The information provided in this document contains general descriptions and technical characteristics of the performance of the product. It is not intended as a substitute for and is not to be used for determining the suitability or reliability of   this product for specific user applications. Any user or installer must perform the appropriate and complete risk analysis, evaluation and testing of the products concerning the relevant specific application or use. Trolex shall not be responsible or liable for misuse of the information contained herein. If you have any suggestions for improvements or amendments, or find errors in this publication, please notify us at marketing@trolex.com.  No part of this document may be reproduced in any form or by any means, electronic or mechanical, including photocopying, without express written permission of Trolex.  All pertinent state, regional, and local safety regulations must be observed when installing and using this product. For reasons of safety and to help ensure compliance with documented system data, only Trolex or its affiliates should perform repairs to components. When devices are used for applications with technical safety requirements, the relevant instructions must be followed.

Trademarks

© 2015 Trolex® Limited. Trolex is a registered trademark of Trolex Limited. The use of all trademarks in this document is acknowledged.

Document History

• Issue 1 26 January 2015 Original publication of this document – 18th draft

Contact Details
Trolex Ltd, Newby Road, Hazel Grove, Stockport, Cheshire, SK7 5DY, UK +44 (0) 161 483 1435 sales@trolex.com

• Trolex Ltd. Newby Road, Hazel Grove, Stockport, Cheshire SK7 5DY, UK t: +44 (0)161 483 1435 e: sales@trolex.com www.trolex.com

References

• Trolex – At Trolex, we save lives. 60 years of our pioneering safety technology has helped keep workers protected in even the most challenging environments.

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