Electromagnetic flowmeter self-diagnosis information and troubleshooting

April 08, 2023

The printed circuit board of the electromagnetic flow converter adopts the surface welding technology and is not serviceable to the user. Therefore, the user cannot open the converter housing. The intelligent converter has self-diagnosis function. In addition to power supply and hardware circuit faults, faults that occur in general applications can give correct alarm information. This information is presented in the upper right of the monitor! Exclamation mark. In the measurement state, the page is scrolled by the next key, and the fault content is as follows: normal flow, excitation alarm, and empty control alarm.

First, no electromagnetic flowmeter display

1. Check whether the power is on;

2. Check that the power fuse is intact;

3. Check whether the supply voltage meets the requirements;

4. Check whether the display contrast adjustment can be adjusted and whether the adjustment is appropriate;

5. If the above three items are all normal, the fourth item of display contrast adjustment cannot be adjusted. Please send the instrument to the manufacturer for repair.

Second, electromagnetic flowmeter excitation alarm

1. Excitation wiring EX1 and EX2 open circuit;

2. The total resistance of the sensor excitation coil is less than 150Ω;

3. If both a and b are normal, the converter is faulty.

Third, electromagnetic flowmeter empty alarm

1. Measure whether the fluid is full of sensor measuring tube;

2. Use a wire to short-circuit the converter signal input terminals SIG1, SIG2, and IGGND. At this time, if the empty pipe alarm is cancelled, the converter is normal. The measured fluid may have low conductivity or empty pipe threshold and empty pipe. Range setting error;

3. Check whether the signal connection is correct;

4. Check the sensor electrode is normal;

1 Make the flow rate zero, observe that the conductivity ratio should be less than 100%

2 In the case of flow, measure the resistance of the terminals SIG1 and SIG2 to SIGGND, respectively, should be less than 50KΩ (water is the measured value for the medium. It is best to use a hand multimeter to measure, and you can see the charge and discharge circuit in the measurement process).

5. Use a multimeter to measure the DC voltage between DS1 and DS2 should be less than 1V, otherwise the sensor electrode is contaminated and should be cleaned.

Fourth, the electromagnetic flowmeter upper limit alarm

The upper limit alarm indicates that both the output current and the output frequency (or pulse) are beyond the limit. Increasing the process range can undo the upper limit alarm.

Fifth, the electromagnetic flow meter limit alarm

The lower limit alarm indicates that the output current and output frequency (or pulse) are out of limits. Lowering the flow range can undo the lower limit alarm.

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