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Anonymous Poster

How to calculate pressure value accoring to mA

01/05/2010 10:22 PM

Dear all,

How to calculate Pressure/temp value by known mA output.

Ex: LRV 10 BARG

URV 50 BARG

mA OUTPUT: 7.2

SO what is the actual pressure ( Please give the forlulae)
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Tornado
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Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
Posts: 21017
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#1

Re: How to calculate pressure value accoring to mA

01/05/2010 11:16 PM

LRV corresponds to 4 ma

PV to 7.2 ma

URV to 20 ma

It's linear interpolation between.

[Some systems are based on 1-5 VDC rather than 4-20 ma. Same idea. Also, I think there may be "reverse action" cases in which 4-20 ma matches a decreasing PV (process value). Drawing a linear graph sometimes helps.]

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Amixs
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Join Date: Oct 2009
Location: Lithuania
Posts: 1
#2

Re: How to calculate pressure value accoring to mA

01/06/2010 1:10 AM

Out(bar)=((Out(mA)-4)/16)*(URV-LRV)+LRV

I think it helps
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craigza
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Join Date: Nov 2008
Location: Johannesburg
Posts: 295
Good Answers: 12
#3

Re: How to calculate pressure value accoring to mA

01/06/2010 3:54 AM

Hi there,

Even simpler:

Out (Bar) = (URV - LRV) / 16 * 7.2 (Measured mA)

Regards,

Craig
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Anonymous Poster
#4

Re: How to calculate pressure value accoring to mA

01/06/2010 9:55 PM

Thanks a lot
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