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The conductivity of the electromagnetic flowmeter decreases
Electromagnetic flowmeter conductivity drops, nowadays, development trend of electromagnetic flowmeter converter input impedance has a lot of, when the conductivity of liquid is basically not easy because of the change of the conductivity of medium caused by the deviation, but the necessary input impedance converter, the conductivity of the measured medium under a limit min, may not be lower than the limit.
Electromagnetic flowmeters will encounter a decline in conductivity, which usually leads to the electromagnetic flowmeters can not work properly, so how to deal with it?A decrease in the conductivity of the fluid will increase the output impedance of the electrical stage and will result in a deviation from the load effect due to the input impedance of the converter.
The output impedance of the electrical stage determines the size of the input impedance required by the converter, while the output impedance of the electrical stage is considered to be dominated by the conductivity of the fluid and the size of the electrical stage.In theoretical analysis, the electrical level as the electrical level, size can be ignored, in fact, size, electrical level necessary when d circular plate electrode diameter and conductivity K semi-infinite broadening fluid touch, the broadening resistance for 1/2 Kd, therefore, if the pipe diameter d > > d, the electric level of output impedance for combined two broadening resistance, which is equivalent to 1 / Kd.General measure the lower limit of the fluid conductivity of 5 mu S / ㎝ ~ 10 mu S / ㎝, therefore, if ㎝ electrode diameter is 1, the output impedance of the electrode is 1 / Kd Ω Ω = 100 k to 200 k, in order to make the output impedance of the interference will be limited to less than 0.1%, the input impedance converter should be around 200 m Ω.
Therefore, it is necessary for an electromagnetic flowmeter not to be interfered by the conductivity of the medium. The conductance string of the medium under test can neither be large nor small.Following the development trend of electronic technology, the development trend of converter input impedance will eventually be able to reduce the lower limit of the conductivity of the medium to be measured.
At present, Shanghai porcelain flowmeter has been exported to more than 100 countries, involved in more than 100 industries.At the same time, the research and development of micro flowmeter also obtained the metrological certification.At home to fill the gap in the micro flowmeter, while breaking the monopoly of foreign enterprises.
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