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Appendix 3 Trouble Shooting
Before any hardware repair, please ensure all following points are correct as these affect the
performance
1. Check if the instrument is correctly supplied power
2. Check if the instrument wiring is correct against Charpter 2
3. Check the straightway lengths are properly set as discribed in Chapter 6.2
4. Check if the actual flow direction is same as the indicator on instrument is
5. Check if there are pipe leaks
Cut off the power supply before removing instrument
Make sure the pipe is decompressed before repair
Troubles
Possible causes
Solutions
Velocity
is
anomaly
or
fluctuation
Abnormal or irregular fluid
Refer to chapter6.2
The flow regulator is not installed in
front of instrument
Correct the installation
Sensor faulty
Send to manufacturer
Electronic component anomaly
Send to manufacturer
Incorrect or unstable grounding
Check the wiring
Measured velocity
is too high or too
low
The direction of sensor is not correct
The flow direction indicator arrow points
to the downstream
The flow regulator is not installed in
front of instrument
Correct the installation
No response for
the flow
No power
Turn the power supply on
Gas contains water
Install a dryer of filter at upstream
The signal cut-off is set too high
Set a correct value by using keyboard of
software
The actual flow rate is less than the
instruction minimum flow
Set
instrument
span
or
contact
manufacturer for re-calibrating
Sensor faulty
Send to manufacturer
PCB faulty
Send to manufacturer
