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Accuracy of DP transmitter & ERS system

I received this question in my email and wanted to open it up to the pressure measurement community for your wisdom and guidance... Thanks!

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I have some very basic question associated with subject topic, would appreciate if you could share your experience with me or could guide me with better solution.

We are currently have an application where we are measuring DP (0.35 barg is alarm) across the sour water stripper through an Emerson DP transmitter (3051CD2) with remote seals and capillary tubing. Below is the process data:

  • Oper pressure = 1.75 barg
  • design pressure = 5.5 barg
  • DP alarm set point = 0.35 barg
  • Temp = 156 to 165 degC

However this Instrument is not working fine, we are now considering to replace it with Emerson ERS system with two similar transmitters 3051SAM...T type with range of (-1 to 10.35 barg), as per the catalog the accuracy of these two transmitters is 0.035% of span.

Is it the correct calculation?

What is term range down? It is mentioned as 150:1 

Which is the most accurate type to measure DP across the absorbers/contactors in sour gas service where the DP more than 0.35barg could be interpretted as foaming? In industry still the DP transmitters with tubing is working fine but how accurate this it. Pls. share your experience and details

Thanks in advance.

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