Dwyer TFP-GV - Manual (Page 26)

F-20-TFP-G, pg. 26 of 27
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 D3).
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 D3).
Correct for the pressure
drop ( ÄP ).
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 D3).