Procedure:
1. Turn power OFF to the sensor board
2. Move the calibration jumpers (JP4) so that both pins are covered by the jumpers
3. Turn power ON to the sensor board
4. Connect the negative voltmeter lead to COM (TP3)
5. Connect the positive voltmeter lead to AN OUT (TP7)
6. Set the voltmeter to measure DC voltage (VDC)
a) If possible, set the meter to display the average voltage to smooth out readings
7. 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
8. Remove the top calibration jumper on JP4
9. Apply test gas directly to the sensor
a) The voltage at TP7 will begin to drop
10.Once the voltage stabilizes, remove the bottom calibration jumper on JP4
a) Stabilization requires approximately 5 minutes from the application of gas
11. Remove test gas from the sensor
12.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
13.Cycle power to the sensor board to verify that calibration data has been saved
14.Repeat this procedure for any remaining sensor boards
FG01
Rev 1.2 – January 10, 2022
2
