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126B - PAGE 16
SYMPTOM: SYMPTOM:
SYMPTOM: SYMPTOM:
SYMPTOM: Sensor has proper resistance readings, but little or no output with flow.
CAUSE:CAUSE:
CAUSE:CAUSE:
CAUSE: Plugged sensor.
AA
AA
A
CTION:CTION:
CTION:CTION:
CTION: Shut off gas supply and power supply. Remove cover and PC board from unit. Remove
sensor assembly and examine. If sensor has evidence of plugging, clean or replace as applicable.
SYMPTSYMPT
SYMPTSYMPT
SYMPT
OM:OM:
OM:OM:
OM: Flowmeter reads other than 0.00 VDC with no flow, or there is a small flow when
flowmeter reads 0.00 VDC.
CACA
CACA
CA
USE:USE:
USE:USE:
USE: ZERO potentiometer is out of adjustment.
AA
AA
A
CTION:CTION:
CTION:CTION:
CTION: Shut off all flow. Adjust ZERO potentiometer until output reads 0.00 VDC.
SYMPTOM:SYMPTOM:
SYMPTOM:SYMPTOM:
SYMPTOM: Flowmeter out of calibration and non-linear.
CAUSE:CAUSE:
CAUSE:CAUSE:
CAUSE: Leaks in gas inlet or outlet fittings.
AA
AA
A
CTION:CTION:
CTION:CTION:
CTION: Check all fittings for leaks by placing soap solution on all fittings between gas supply and
final destination of gas. Check flowmeter for leaks. Replace “O” rings if required or recalibrate as
necessary.