Maintenance Knowledge of Electromagnetic Flowmeter

2019-01-12
 Maintenance Knowledge of Electromagnetic Flowmeter
 
Maintenance of electromagnetic flowmeter
The electromagnetic flowmeter converter has a self-diagnostic function. In addition to power 
 
and hardware circuit failures, faults that occur in general applications can be correctly given
 
Alarm information.
Electromagnetic flowmeters are common faults
Maintenance and maintenance mainly have the following aspects:
 
1.Excitation alarm
When this phenomenon occurs, check whether the excitation wiring x and y are open, check 
 
whether the resistance value of the excitation coil is normal, and determine whether the converter has malfunction.
 
2.The measured flow is not accurate
When this happens, it should be checked whether the fluid is filled with the sensor measuring 
 
tube, the signal line connection is normal, check the sensor coefficient, sensor zero
Whether the point is set normally by the sensor label or the factory checklist.
 
3.Meter no display
When this fault occurs, first check whether the power supply is turned on, check whether the 
 
power supply fuse is intact, and check whether the power supply voltage meets the requirements, 
 
such as if all of the above are normal, the converter should be sent to the manufacturer for repair.
 
4.Empty tube alarm
When this problem occurs, measure whether the fluid fills the sensor measuring tube and check 
 
that the signal wiring is correct. Check if the flow sensor electrode is normal. Use a wire to 
 
short-circuit the converter signal input terminals a, b, and c. At this time, if the “empty 
 
pipe alarm” prompts to cancel, the converter is normal.
 
There may be a low conductivity of the measured fluid or an empty tube threshold and an empty 
 
tube range setting error.


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