MGS-350 Manual
6509-9000 Rev 1
39
Step
Calibrating Infrared (IR) Sensors
1
R7 is used to adjust the zero of the sensor. On the
motherboard, monitor the output between TP0 (negative) and
CON3 pin 3 (positive). Expose the sensor to nitrogen or zero
air. Allow a minimum of 3 minutes to stabilize, and then
adjust R7 until the voltmeter reads 0 V or slightly positive
(0.01 V is acceptable).
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 and then
adjust R1 until the voltmeter reads the voltage calculated in
section 4.4.
Figure 16. IR Sensor Board