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hiteshpurani
Active Contributor

Join Date: Feb 2009
Location: india
Posts: 12

vacuum type dp transmitter calibration

02/01/2009 8:37 AM

sir , i want to calibrate my dp transmitter on -1 bar.

i have no vacuum pump. can any aternate method to calibration.

if i give 1 bar pressure on LP side and open HP to atmosphere?

thnk

hitesh
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Richard L
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United States - Member - USA Engineering Fields - Control Engineering - Never enough money

Join Date: Feb 2007
Location: Oregon
Posts: 292
Good Answers: 4
#1

Re: vacuum type dp transmitter calibration

02/02/2009 2:17 AM

In most vaccum applications the LP side is connected to the process and the HP side is open to atmosphere which means you will need to apply 1 bar to the HP side and open the LP side to atmosphere in order to do a calibration.
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Vulcan
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Philippines - Member - New Member Engineering Fields - Instrumentation Engineering - New Member Engineering Fields - Control Engineering - Who am I?

Join Date: Oct 2006
Location: Northern Mindanao, Philippines
Posts: 2147
Good Answers: 53
#2

Re: vacuum type dp transmitter calibration

02/03/2009 8:31 AM

Technically, yes, if you have a dp transmitter your method will produce a dp transmitter that is calibrated to -1 barg.That is, your -1 bar is referenced to gauge pressure which is atmospheric pressure.

If you need absolute pressure, it gets a little more involved.

regards,

Vulcan

__________________
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Anonymous Poster
#3

Re: vacuum type dp transmitter calibration

02/07/2009 1:42 AM

It is correct, you apply 1bar pressure to LP side and open HP to atmosphere to calibrate transmitter with rang below zero.

Good luck
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