The flowmeter model selection is very important in the application of instrument. The related information shows that in the practical application of instruments,2/3 failures are caused by incorrect selection of model and incorrect installation of instrument to which the special attention shall be paid.

1.    Data Collection

1>    Name of measured liquid and its chemical substance.

2>    Maximum flux and minimum flux Normal flux.

3>    Maximum working pressure.

4>    Maximum and minimum temperatures.

2.    The measured liquid shall have certain conductivity, with conductivity t>5 μS/cm.

3.    The Miximum flux and the minimum flux shall meet the values specified in the following page.

4.    The actual maximum working pressure shall be less than the rated working pressure of the flowmeter.

5.    The maximum and minimum working temperatures shall meet the temperature requirement stipulated for flowmeter.

6.    Whether negative pressure exists or not shall be confirmed.

You may choose a corresponding electromagnetic flowmeter according to the fluxes in the above table, and if the inside diameter of the selected electromagnetic is different from that of the tube under existing process, the tube reduction or expansion shall be considered.

1.    In case of tube reduction, whether the pressure loss caused by tube reduction will affect the process flow or not shall be considered.

2.    If the price of the product is considered, the electromagnetic flowmeter with smaller diameter maybe selected to reduce investment relatively.

3.    When the uncontaminated water is measured, the economic velocity is 2-3m/s, and when the solution which is easy to crystallize is measured, the velocity shall be increased appropriately to common velocity of no less than 2 m/s. so as to prevent the electrode of electromagnetic flowmeter from being covered.

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