Recalibration/Reranging of Flow DP Tx

[jeffvok]

Hi guys.I'm facing a problem with a Flow DP Tx.Currently,the calibration range is 0-850m3/h (0-71kPa).But it gives an over range reading up to 1199m3/h.

The problem is now the process dept wants this tx to be able to read up to 1400m3/h (Changed new pump).The datasheet indicates that the adjustable range of the orifice plate is 112 kPa.Can a recalibration be done to read up to 1400m3/h without changing the orifice plate?

 

[quark]

Roughly, 112kPa corresponds to (112/71)^1/2*850 = 1067m³/hr. So, not possible.

 

[JLSeagull]

Your flow range is 0-850m3/h based upon a pressure differential of 0-71kPa (285"WC). This is already a high differential for orifice measurement. The transmitter can be ranged up to 112 kPa (450"WC). This is a very high range for orifice flow measurement.

You need to change something. You could change to a higher range transmitter, change the plate, change the piping or change the measurement technology.