Dp pressure logic - PLCS.net

RY_Guthrie · February 11th, 2019, 04:58 PM

I am installing a dp transmitter along with a temp probe and a static pressure transmitter and I am trying to figure out the best way to calculate the flow rate of a gas in a control logic using ladder programming. I was wondering if anyone knows of a place where i can look at examples of that logic? Does rockwell offer examples of it different logic? thanks!

Tom Jenkins · February 11th, 2019, 05:26 PM

ASME PTC 19.5 is the most authoritative guide to flow measurement. The equation relating differential pressure to flow will vary based on the primary element - pitot tube, orifice, flow tube, etc.

danw · February 11th, 2019, 08:13 PM

Be aware of one of hhe Gotchas: the static pressure factor in yhe calculation is absolute pressure, not gauge pressure.

Check out E&H’s slide presentation, here:
https://www.my.endress.com/_storage/...esentation.pdf

February 11th, 2019, 04:58 PM	#1
RY_Guthrie Member Join Date: Nov 2011 Location: Las vegas, NV Posts: 190	Dp pressure logic I am installing a dp transmitter along with a temp probe and a static pressure transmitter and I am trying to figure out the best way to calculate the flow rate of a gas in a control logic using ladder programming. I was wondering if anyone knows of a place where i can look at examples of that logic? Does rockwell offer examples of it different logic? thanks!

February 11th, 2019, 08:13 PM	#3
danw Member Join Date: Oct 2004 Location: midwest, USA Posts: 2,868	Be aware of one of hhe Gotchas: the static pressure factor in yhe calculation is absolute pressure, not gauge pressure. Check out E&H’s slide presentation, here: https://www.my.endress.com/_storage/...esentation.pdf Last edited by danw; February 11th, 2019 at 08:19 PM.

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February 11th, 2019, 05:26 PM	#2
Tom Jenkins Lifetime Supporting Member Join Date: Apr 2002 Location: Milwaukee, WI Posts: 5,935	ASME PTC 19.5 is the most authoritative guide to flow measurement. The equation relating differential pressure to flow will vary based on the primary element - pitot tube, orifice, flow tube, etc.

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