pg. 27 of 29
Symptom Possible Cause Method of Correction Flow indication is not
linear and output too
low at lower flows
Attempting to measure
flows below the specified
minimum for the unit
Moisture or liquid in sensor
Mechanical sensor assembly
damaged
Use higher flow rates
Remove moisture and allow
sensor to dry out
Unit must be returned for
repair (see Section J)
Flow reading accuracy
is outside the
specification
Gas has a specific gravity
other than Air at 20°C
Moisture in sensor
Mechanical sensor assembly
damaged
Pressure drop issue
Calculate the flow reading
error / offset as explained in
section C6
Allow sensor to dry out.
Ensure gas is dry.
Unit must be returned for
repair (see Section J)
Correct for the pressure
drop ( ΔP )
Flow indication is fixed
at one value
The maximum rated flow for
the unit is being exceeded.
Output circuits may be
damaged
Reduce the flow
Unit must be returned for
repair (see Section J)