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The troubleshooting methods of electromagnetic flow meter include resistance method, current method, voltage method, analog signal method and waveform method.
(1) On-off of power fuse and excitation insurance of electromagnetic flow meter;
(2) On-off of signal cable and excitation cable of electromagnetic flow meter;
(3) On-off and resistance of excitation coil of electromagnetic flow meter;
(4) Insulation resistance of excitation coil of electromagnetic flow meter to ground;
(5) Measurement of electrode symmetry;
(6) Insulation resistance of electrode to ground;
(7) Resistance value of power transformer of electromagnetic flow meter.
Measure the output current and excitation current of electromagnetic flow meter.
Determine the working power supply.
Use the analog signal generator to provide the flow signal to test the flow sensor.
Testing key point waveform electromagnetic flow meter based on familiarity with circuit includes appearance inspection, converter characteristic test, measurement value calibration, voltage measurement of each department, insulation resistance measurement, circuit confirmation, etc. It is very important to adjust the zero point because the zero point drifts when the instrument is checked and adjusted.
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