1. Sensor inspection
Test equipment: a 500MΩ insulation resistance tester and a multimeter.
2. Check the converter
If the electromagnetic flowmeter is judged to be a converter failure, if there is no problem after checking the external cause, please contact the manufacturer and usually adopt the method of replacing the circuit board.
Practice of Measuring Low Conductivity Medium with Electromagnetic Flowmeter
Electromagnetic flowmeter is used to measure the volume flow of conductive liquid medium with conductivity greater than 5μs/cm. The measurement principle of electromagnetic flowmeter is mainly based on Faraday's law of electromagnetic induction, that is, when the fluid passes through the measuring tube, the cutting magnetic field lines induce 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 velocity is measured. 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 difficult to be induced. Through on-site practical operation methods, our Tremok summed up the following points for reference:
The first is to determine whether the measured medium has conductivity;
The second is to install the electromagnetic flowmeter in strict accordance with the product manual;
Third, when the electromagnetic flowmeter is debugged, the empty pipe alarm in the electromagnetic flowmeter converter is turned off, and the electromotive force can be detected smoothly.