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sarasoccer
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Join Date: Oct 2013
Posts: 2

Pressure Transmitter Placement and Adjustments

10/07/2013 2:43 PM

Guys please let me know if i am going to place the pressure transmitter above the tapping point for liquid services , what adjustments should i make for the transmitter to get the correct reading?
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lyn
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Join Date: Oct 2008
Posts: 42355
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#1

Re: Pressure Transmitter placed above the tapping point for liquid services

10/07/2013 4:32 PM

That information will be provided by the instrumentation engineer, or someone who can read the installation documents, if any.

Or, maybe the operator's manual.

Or, maybe the janitor can tell you.

Place it above the instrument drain, and get some competent guidance.

What is the name of your organization????

Are you processing hazardous materials???
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tonykuphaldt
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Join Date: Sep 2011
Location: Bellingham, WA
Posts: 191
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#2

Re: Pressure Transmitter placed above the tapping point for liquid services

10/07/2013 6:15 PM

A reference you might wish to peruse to answer this and other questions about pressure measurement is found here:

http://www.ibiblio.org/kuphaldt/socratic/sinst/book/liii.pdf

This is a textbook written for 2-year college students in Instrumentation programs. Download and save this PDF file to your computer, because it is too large to read "online" effectively.

Specifically regarding your question on transmitter placement, the effect on calibration resulting from locating the transmitter at some height other than the tapping point is called either "elevation" or "suppression". Basically, the weight of the liquid in the impulse tube between the transmitter and the process connection point generates either a pressure or a vacuum that offsets the amount of pressure registerd by the instrument.

If you search for these terms in the book, you will find more detailed information.

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