Electromagnetic flowmeter maintenance case

Electromagnetic flowmeter maintenance case:

1, sensor inspection

Test equipment: one 500MΩ insulation resistance tester, one multimeter.

2, converter check

If the electromagnetic flowmeter is judged to be a converter failure, if there is no problem in checking the external cause, please contact the manufacturer and generally solve the problem by replacing the circuit board.

Practice of Measuring Low Conductivity Medium by Electromagnetic Flowmeter

The electromagnetic flowmeter is used to measure the volumetric flow rate of the conductive liquid medium with conductivity greater than 5μs/cm. The electromagnetic flowmeter measurement principle is mainly based on Faraday's law of electromagnetic induction, that is, when the fluid passes through the measuring tube, the cutting magnetic field line induces the electromotive force. The electromotive force is proportional to the magnetic flux density, the product of the inner diameter of the measuring tube and the average flow rate. The electromotive force (flow signal) is detected by the electrode and sent to the converter through the cable. However, when measuring the weak conductivity medium, the electromotive force is hard to be induced. Through on-site practice, we have concluded the following points for reference:

The first is to determine whether the measured medium has conductivity;

Secondly, the installation of the electromagnetic flowmeter should be strictly in accordance with the product manual;

Once again, when the electromagnetic flowmeter is commissioned, the parameter of the empty tube alarm in the electromagnetic flowmeter converter is turned off, and the electromotive force can be smoothly detected.