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Routine maintenance of electromagnetic flowmeter

Issuing time:2018-01-30 09:28

Routine maintenance of electromagnetic flowmeter

Hello, everyone, today small make up for you is about the electromagnetic flow meter routine maintenance method.

Measurement of electrode contact resistance measurement of liquid contact resistance of electrode spoon can indirectly estimate the general condition of electrode and lining surface without removing the flow sensor from the pipe, which is helpful to analyze the cause of failure.

The polarization voltage between the electrode and the liquid will be helpful to determine whether the zero point instability or output sloshing fault is caused by the contamination or coverage of the electrode. The polarization voltage between the two electrodes and the ground can be measured respectively with the digital multimeter 2V dc (the electromagnetic flowmeter can be measured without power failure or without power failure). If the two measurements are nearly equal, the electrode is not contaminated or covered; otherwise, the electrode is contaminated or covered. The polarization voltage depends on the "electrode potential" of the electrode material and the properties of the liquid. In fact, the contamination of two electrodes in operation cannot be completely symmetrical, so the voltage on the two electrodes forms an asymmetric common mode voltage. The asymmetric common mode voltage becomes the differential mode signal, causing the zero offset.

Measurement of signal cable interference signal cable interference by external electrostatic induction and electromagnetic induction will cause zero changes in the electromagnetic flowmeter. In order to determine whether the zero point change is affected by the signal cable interference potential, it is necessary to measure the general range of interference and the degree of influence on the electromagnetic flowmeter.

Four, determine whether there is a ground potential electromagnetic flow juice in the normal use of the process, such as the sensor near the electrical (force) machine state changes (such as leakage), the ground potential will change and cause zero change. Check for this effect by short-circuiting the earthing C terminal of the converter to the protective earthing G terminal, and judge whether there is a ground potential by the change of zero (or indicating value).

In order to narrow the search scope, it is necessary to reduce or eliminate the influence of stray current on the upstream of the flow sensor.

The above is about the electromagnetic flow meter routine maintenance method, I hope to help you.


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Perkins
Product name:
electromagnetic flowmeter Date of purchase: May 2015 Purchase quantity: 8 sets
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vortex street flowmeter
Date of purchase: July 2016
Purchase quantity: 5 sets
Wuxi Shenli
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differential pressure transmitter
Date of purchase: March 2017
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Walter machinery
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