Problems with liquid conductivity exceeding the allowable range If the liquid conductivity is close to the lower limit, sloshing may occur. According to the instrument specification, the specified lower limit value is the lowest value that can be measured under various conditions of good use, and the actual conditions are not ideal, so that low-grade distilled water or deionized water is encountered many times. The conductivity is close to the lower limit specified by the electromagnetic flowmeter specification
5
When it is used, output sloshing occurs. It is generally considered that the lower limit of conductivity that can be stably measured is high.
1
~
2
An order of magnitude.
The conductivity of the liquid can be found in the relevant manual. If the data is not available, the sample can be measured with a conductivity meter. However, there are cases where sampling from the pipeline is considered to be available in the laboratory and the actual electromagnetic flowmeter is not working. This is because the liquid in the conductivity is different from the liquid in the pipeline, for example, the liquid has absorbed the atmosphere.
CO2
or
NO
, carbonic acid or nitric acid is formed, and the electrical conductivity is increased.
For noise slurry produced by particles or fiber liquids, the method of increasing the excitation frequency can effectively improve the output sloshing. Frequency adjustable
BF-LDE
type
DN300
Electromagnetic flowmeter, measuring concentration
3.5
% corrugated board slurry, measured at the site with different excitation frequencies to measure the instantaneous flow sloshing. When the frequency is lower, it is
50/32Hz
When shaking, up to
10.7
%; frequency increased to
50/2Hz
Shake down to
1.9
%, the effect is very obvious.
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