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M-4271/0707, pg. 23 of 26
H.
Troubleshooting Guide
Symptom Possible Cause Method of Correction
Clicking noise from
controller
Unit in error mode Check there is sufficient
pressure and that the flow
path is not restricted or
blocked
Unit wired incorrectly Check wiring is according to
Section B5
Loose connection Check all connectors and
wiring
Damaged connector pins Contact Omega Engineering
Blocked flow path Check flow path for
obstructions.
Piping leak before sensor Check all piping and
connections.
Insufficient power Check the power supply
output and increase if
necessary
Output load resistance too low Ensure the voltmeter or
data acquisition system or
display has an impedance of
greater than of 2.5kohm
Flow too low for the unit Ensure that the flow being
measured is within the
capabilities of the unit
No response
Unit damaged or faulty Contact Omega Engineering
Particles in flow path Add filtration before the
sensor.
Flow path obscured Remove any debris or
blockage in the flow path
eg. PTFE tape.
Unit calibrated for a different
gas
Check calibration certificate
and apply a “K” Factor to
readings if necessary.
Gas composition is variable Contact Omega Engineering
Fittings have been changed Replace the factory installed
fittings
Moisture in gas Ensure gas is clean and dry
Insufficient warm-up period Allow the unit to warm-up
for at least 5 minutes.
Zero drift Verify the zero and adjust
as necessary as explained in
Section C
The gain potentiometer has
been adjusted
Contact Omega Engineering
Unit needs recalibration Contact Omega Engineering
Inaccurate control
Flow too high for the unit Ensure that the flow being
measured is within the
capabilities of the unit