Dwyer TFP-GV - Manual (Page 25)

F-20-TFP-G, pg. 25 of 27
H. Troubleshooting Guide
Symptom Possible Cause Method of Correction
Unit Leaks. Fittings not tight enough.
Sensor assembly cracked. Tighten fittings (see section
B3).
Unit must be returned for
repair (see Section D3).
No output signal or
flow indication. No power or low power.
No flow passing through
unit.
Output shorted or
overloaded.
Improper connection.
Moisture on internal
electronics.
Output circuitry damaged.
Apply correct power.
Display or output should
read zero.
Check electrical connections
(see section B4).
Check electrical connections
(see section B4) and ensure
connector is correctly
plugged in.
Allow unit to dry out in a
dry environment.
Unit must be returned for
repair (see Section D3).
Flow indication
“bounces” or
fluctuates. Flow is actually fluctuating.
Using a pulsatile or piston
pump that causes a
pulsating flow of gas.
Not using the fittings
supplied by the
manufacturer.
Moisture in sensor.
Turbulence in tubing or
sensor.
Fluctuating input power.
Mechanical sensor
assembly damaged.
Correct flow source to
obtain steady flow.
Switch to a stable source of
gas.
Use the supplied fittings.
Remove moisture and allow
unit to dry out.
Straighten the inlet tubing or
lengthen it to at least 6”
(150mm).
Correct the power source or
change to a regulated
supply.
Unit must be returned for
repair (see Section D3).