Flow Mesurement Knowledge

The presentation of ARTang after-sales case 3

Views:0     Author:Site Editor     Publish Time: 2021-08-26      Origin:Site

Customer's feedbacks about on-sit issues

The dispaly of electromagnetic flowmeter is unstable, and customers judge the flow value is  high based on past value.

Troubleshooting and analysis from technical group of ARTang

Upon receiving feedback from the customer, the Anretang technical team immediately went to the customer site to examine and analyze the faults:

1. The electromagnetic flowmeter calibre is DN100, consistent with the calibre of the pipe measured in the field

2. Check the sensor coefficients of the electromagnetic flowmeter,According to the traceable source, sensor coefficients 1.7534 and the coefficient is consistent with the number calibrated by factory before shippment

3. The flow control valve is installed at the entrance of the electromagnetic flowmeter and the length of the front and rear straight pipe sections does not meet the installation requirements, resulting in a high measurement value


1. Replace the installation position of the flow control valve

2. Extent the front and rear straight pipe segments of the electromagnetic flowmeter 

Customer feedbacks

After changing the  installation position of the flow adjustment valve and extend the length of the straight pipe section ,the flow data becomes normal again said by our customer,and  electromagnetic flowmeter is still working well.

Why do electromagnetic flowmeters avoid being mounted behind valves?

As the media pass through the valve, there may be two phases, the discontent tube and the fluid phase instability will cause the unstale signal output,affecting the measurement accuracy.

Why should electromagnetic flowmeter avoid being installed in front of pump?

If  electromagnetic flowmeter is installed  in front of pump ,it will produce large negative pressure, negative pressure environment will cause lining damage, if  the lining around electrode is damaged, it will cause pipeline leakage, flowmeter cannot use properly.

ARTANG flowmeter
Hangzhou City, Zhejiang
About ARTang
ARTang is the flow & level measurement manufacturer in China, specialied in electromagnetic flowmeter, liquid analysis, vortex flowmeter, level meter, widely used in water/sewage flow measurement, chemical process flow measurement, food process flow measurement, flow measurement of solid liquid, steam delivery flow measurement.
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