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Several wrong use methods of electromagnetic flowmeter

Date:2019-11-21 source:

Several wrong use methods of electromagnetic flowmeter, electromagnetic flowmeter, with the characteristics of high precision, long life, in chemical plant, environmental protection, metallurgy industry and other fields and manufacturing industries have a certain use.However, in the whole process of application, because of the harm of various factors, it is very easy to cause the imprecision of electromagnetic flowmeter measurement results.What is the cause of the deviation caused by the electromagnetic flowmeter?

Several wrong use methods of electromagnetic flowmeter

Several wrong use methods of electromagnetic flowmeter

1. The tube is not filled with liquid

Due to insufficient back pressure or poor installation position of flow sensor, the liquid in the measuring tube could not be filled, and the common failure conditions were mainly manifested by different filling levels and fluidity.

If a small amount of steam in the water pipe shows stratified flow operating room or wavy flow, the common fault condition is mainly manifested as the deviation improvement, that is, the total flow measurement value is not consistent with the specific value.

If the fluidity is a bubble flow or plug flow, the common fault condition is not only the measured value does not conform to the specific value, but also the liquid phase covers the electrode surface for a moment and the output shaking occurs.

If a part of liquid phase in the liquid section of commodity circulation section in the horizontal fluidity of horizontal pipeline is enlarged, that is, the liquid is not full of horizontal expansion of the pipe, there will be output shaking.

If the liquid is not full tube condition is more serious, so that the liquid level below the electrode, there will be output overfull degree.

2, liquid with solid phase

Liquid with powder, particulate matter or solid, such as plant fiber, will cause a common fault;(1) slurry noise;(2) electrode surface stain;(3) conductive layer or insulating layer of sediment cover electrode or lining;(4) the lining is damaged or covered by residual material, commodity circulation section becomes smaller.

3, there will be crystal liquid, electromagnetic flowmeter should be avoided

Some easy crystal chemical raw materials in all normal conditions would all normal temperature measurements, because the transport of fluid mechanics of hose often has excellent electric heating heat insulation heat preservation, in heat insulation work is not easy to crystals, but Mr Greg, electromagnetic induction flow sensor measurement of tube can't execute electric heating heat insulation heat preservation, thus, fluid mechanics, through the measuring tube is the easiest inner cavity caused by thermal reduction have a layer of solid state.

Because changing the steam flowmeter measurement to another basic principle also has a crystal problem, in the absence of any other stronger method, a "ring" electromagnetic induction flow sensor with a very short length of measuring pipe can be used to strengthen the heat insulation of the upstream and downstream pipelines of the steam flowmeter.In connection with the pipeline, considering the flow sensor disassembly is convenient, once the crystal should be easily removed for maintenance.

4. Problems caused by poor selection of electrode and grounding device ring materials

Due to the mismatch between the material and the measured substance, the parts touched by the figureth electromagnetic flowmeter and the substance have electrodes and earthing device rings. The matching is not suitable for the electrode surface function except for the corrosion resistance problem.

Look forward to everyone according to the network of electromagnetic flowmeter cause deviation cause of the detailed introduction, can have a deeper understanding of electromagnetic flowmeter, can properly use electromagnetic flowmeter, to prevent the cause of deviation.

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