Electromagnetic flowmeter output signal over full value phenomenon

Case introduction

The phenomenon and inspection of the electromagnetic flowmeter output signal exceeding the full value. With the continuous advancement of industrial technology, the production process of electromagnetic flowmeters is becoming increasingly mature, the protection level of the instrument is getting higher and higher, and the performance of the instrument is more reliable. Therefore, Judging from the current situation, the electromagnetic flowmeter itself generally does not malfunction.

Common fault phenomena of electromagnetic flowmeters include: no flow signal; output shaking; zero point instability; flow measurement value does not match the application reference value; output signal exceeds the full value, etc.

The phenomenon and inspection of the output signal exceeding the full value

1 The sensor or connecting cable is faulty. There is no liquid connection between the electrodes, cable disconnection or wiring errors will cause the signal loop to be disconnected, causing the The output is super full.

2 Converter failure. Check whether the converter instrument constants are consistent with each parameter, and check whether it matches the sensor. Try replacing the spare circuit board to check for line failures in each unit.

3 Confirm the fault location. Short-circuit the two signal input terminals and the functional ground terminal of the converter, and observe whether the output signal of the converter reaches zero. If it can reach zero, the fault is not in the converter; if it cannot reach zero, the fault is not in the converter. The converter is wrong.

Therefore, if we master the various types of fault phenomena and causes of the electromagnetic flowmeter mentioned above, and strictly follow the standards when installing and using them, we can easily perform maintenance on the electromagnetic flowmeter. Used and maintained.