MGS-350 Manual
36
6509-9000 Rev 1
Step
Calibrating Catalytic (CAT) Sensors
1
R3 is used to adjust the zero of the sensor. On the
motherboard, monitor the output between TP0 (negative) and
CON3 pin 3 (positive) and adjust R3 until the voltmeter reads
approximately 0 V.
2
R1 is used to calibrate the range (span) of the sensor. On the
motherboard, monitor the output between TP0 (negative) and
CON3 pin 3 (positive). Expose the sensor to calibration gas.
Allow a minimum of 3 minutes to stabilize, then adjust pot R1
until the voltmeter reads the voltage calculated in section 4.4.
NOTE:
For catalytic sensors, you MUST use calibration gas
in a balance of air (
not
N
2
).
Figure 14. CAT Sensor Board