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level measurement of an iaec boiler drum

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Sinoy

A 1151 dp transmitter of range 0-1250 mmWC installed for level measurement of an IAEC boiler drum needs to be calibrated for a range of -460 to 0 mmWC. We did it by zero elevation method. Bt the problem is when it is installed on the process line it indicates correctly only for some time. Now it is indicating almost 25 unit less than it is seen in the sight glass. The pipelines of both ends were equally filled with water.

Hope you will provide me a better corrective step.
 
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