Maintenance of electromagnetic flowmeters during field use

Electromagnetic flowmeter in the operation of the two kinds of failures: First, the instrument itself is faulty, that is instrument structure or component damage caused by failure; Second, caused by external causes of failure, such as improper installation flow distortion, deposition and knot Scale and so on. This article discusses these two types of faults.

1. There are several reasons why electromagnetic flowmeters may not have a flow signal output:

One is that the cable between the excitation system and the signal system is not connected; the second is that the flow direction of the monitoring liquid does not coincide with the direction of the arrow on the sensor housing; third, the liquid in the pipeline is not filled; and the fourth is the electromagnetic flow meter Causes the excitation coil to burn out.

The corresponding solution is as follows:

The first is to check the cable interface and connect it; the second is to change the direction of installation of the sensor; the third is to install a U-shaped pipe on the downstream side of the electromagnetic flow; fourth is to discharge the electromagnetic flowmeter water in time, if not serious, you can Dry the terminals and continue to use them; if burned out, replace the new excitation coils.

2. There are several reasons why the measured value of the flow rate of the electromagnetic flowmeter may not match the reference value provided by the electromagnetic flowmeter:

One is that the resistance between the two poles of the sensor has changed or the insulation of the two poles has been reduced; the second is that the liquid in the pipeline has bubbles or liquid filling dissatisfaction; the third is that the set value of the start of the converter is wrong.

The corresponding solution is as follows:

One is to replace the sensor; the other is to check the existence of the fluid, so that the fluid fills the entire pipe; the third is to check the constant of the electromagnetic flowmeter and the unit of measurement, pipe diameter and other values, and accurately adjust the zero point and range of the converter.

3. The electromagnetic flowmeter output signal may exceed the full-scale value due to the following reasons:

One is that the excitation system and signal system cables are not connected; the second is that the converter's instrument constants and parameters do not match; and the third is a lightning strike.

The corresponding solution is as follows:

One is to inspect the cable interface and connect it; the other is to enable the backup circuit board to inspect the components of the converter. If damage is found, replace it in time and replace it. The third is to set lightning protection measures for the power line.

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