The electromagnetic flowmeter is an instrument that uses the Faraday's law of electromagnetic induction to measure the flow of conductive fluid based on the electromotive force generated by the conductive fluid through the cutting of magnetic lines of force.

 

Common faults of electromagnetic flowmeters are: no display of the meter, inaccurate flow measurement, empty pipe alarm (FGP), system alarm (SYS), upper and lower limit alarm (FQH FQL), etc.

 

The instrument has no display: check steps:

 

① Check whether the converter is watered;

 

② Check whether the power cord is connected correctly and reliably;

 

③ Check whether the fuse in the converter terminal box is blown.

 

Maintenance method:

 

① If the converter enters water, cut off the power and clear the water. If it is not displayed, the converter needs to be replaced.

 

② Connect the power wiring correctly and firmly;

 

③ If the fuse is blown, replace the fuse of the same model.

 

Flow measurement is inaccurate: check steps:

 

① Check whether the medium is full;

 

② Whether the signal cable is connected correctly and reliably;

 

③ Check whether the sensor diameter, meter coefficient 1, and meter coefficient are consistent with the sensor nameplate;

 

④ The readings jump and check whether the ground wire is connected well.

 

Maintenance method:

 

① If the medium cannot be full, you need to reinstall the flowmeter correctly;

 

② Connect the signal wires correctly and firmly;

 

③ Modify the parameters to be consistent with the nameplate;

 

④ Connect the ground wire.

 

Air traffic alarm (Mtsnsr):

 

① Check if the medium is full

 

② Short-circuit the converters SIG1 and SIG2 to SIG GND to see if the fault can be eliminated;

 

③ Check whether the signal cable is connected correctly;

 

④ Check whether the electrode is contaminated (if it is contaminated, clean it with a soft brush); ⑤ When the flow is zero, check that the parameter Mtsnsr Emval should be greater than 500; ⑥ When the medium is water and there is a flow Next, check the resistance of SIG1 or SIG2 to ground. Its value should be less than 50K Ω.