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Troubleshooting
7.1
Troubleshooting
If after correct comissioning you encounter problems with the flowmeter, check both flow meter
and application. The most frequent problems and causes are covered below.
No mass flow reading
1.
2.
3.
Unstable or faulty mass flow reading
Make sure that a proper zero point adjustment has been made. A faulty zero point adjustment
may lead to faulty readings. The following reasons can disturb the zero point adjustment
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•
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•
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Check the electrical wiring according to the wiring diagram
Check that the multi-plug is properly connected to the sensor and sufficiently tightened
Check that empty pipe is not active
The flow value was not zero during zero-point adjustment. Ensure that the valve shuts 100%
tight. Even very small flow rates will lead to an erroneous zero-point.
The liquid was not in a homogenous state during zero-point adjustment. A high content of
vapor or air due to non ideal temperature or pressure conditions may lead to 2-phase
conditions. Ensure that you only have liquid or gaseous phase conditions.
Ensure that the media in the sensor are in conditions close to the working conditions during
zero adjust.
Ensure sufficient back pressure.
The sensor is exposed to heavy mechanical noise/vibrations. Heavy mechanical vibrations
can be transported mechanically or hydraulically via the liquid and might affect the system
performance. Typical vibration sources are pumps or mechanical engines. To check
whether pump vibrations affect the system, carry through a zero-point adjustment with an
activated pump and then one with a de-activated pump. If a large deviation can be detected,
take precautions to avoid the vibrations.
SFIDK.PS.028.S2.02
7
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