BRASCH Generation 2 Sensor Boards Instructions

: June 9, 2024
: BRASCH

Table of Contents

Overview
Required
Procedure
Troubleshooting
General Contact Information
Technical Support Contact Information
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

BRASCH Generation 2 Sensor Boards Instructions

Overview

Brasch Generation 2 sensor boards are calibrated at the factory and have an expected calibration duration of approximately two years. Environmental conditions may shorten or prolong this period of time, but once the sensor parameters drift outside of acceptable tolerances, the sensor board must be either be recalibrated or replaced.

This document outlines the procedure for performing field calibration of all Brasch Generation 2 sensor boards including:

Carbon Monoxide Models

GSE2-CM-24
GSE2-CM-120
GSE2-CM-Remote
TRNS2-CM-Analog
TRNS2-CM-Digital
GDCP-CM-Remote

Nitrogen Dioxide Models

GSE2-ND-24
GSE2-ND-120
GSE2-ND-Remote
TRNS2-ND-Analog
TRNS2-ND-Digital
GDCP-ND-Remote

Combination Models

GSE2-NCM-24
GSE2-NCM-120
GSE2-NCM-Remote
TRNS2-NCM-Analog
TRNS2-NCM-Digital
GDCP-NCM-Remote

Required

Voltmeter
Potentiometer Adjustment Tool
100 PPM Carbon Monoxide Test Gas (for CO sensors)
5.0 PPM Nitrogen Dioxide Test Gas (for NO2 sensors)
Gas Flow Regulator
Tubing
Calibration Hood

Note: All of the above required parts (except a voltmeter) are included with Brasch CO and NO2 Test Gas Kits.

Procedure

Turn power OFF to the sensor board
Move the calibration jumpers (JP4) so that both pins are covered by the jumpers
Turn power ON to the sensor board
Connect the negative voltmeter lead to COM (TP3)
Connect the positive voltmeter lead to AN OUT (TP7)
Set the voltmeter to measure DC voltage (VDC)
a) If possible, set the meter to display the average voltage to smooth out readings
Use the potentiometer adjustment tool on R2 until the meter reads approximately 5.0 V
a) This number will fluctuate but should remain stable at or near 5.0 V
Remove the top calibration jumper on JP4
Apply test gas directly to the sensor
a) The voltage at TP7 will begin to drop
Once the voltage stabilizes, remove the bottom calibration jumper on JP4
a) Stabilization requires approximately 5 minutes from the application of gas
Remove test gas from the sensor
Verify that the voltage at TP7 returns to approximately the same value as was set in step 7
a) Stabilization may take approximately 5 minutes from the removal of gas
Cycle power to the sensor board to verify that calibration data has been saved
Repeat this procedure for any remaining sensor boards

Troubleshooting

If any of the following errors are present, calibration data was corrupted and this procedure needs to be repeated.
- Standalone Detectors: 9997
- BMS Transmitters: 0x0008
- Control Panel Remotes: Sensor # Calibration Invalid
If achieving stable voltages is not possible, it may be necessary to replace the sensor and/or the sensor board.
- Once the useful lifespan of the sensor is exceeded, the sensor can no longer be recalibrated. Both carbon monoxide and nitrogen dioxide sensors have an expected lifespan of up to 10 years; however, this period can be reduced with increased exposure to the target gas or sensor poisons. Replacing the sensor should yield more stable voltages.
- Over time, control electronics can degrade or suffer damage. If this is the case, replacing the sensor board should yield more stable voltages.