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Old February 11th, 2019, 03:58 PM   #1
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RY_Guthrie is offline
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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!
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Old February 11th, 2019, 04:26 PM   #2
Tom Jenkins
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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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Old February 11th, 2019, 07:13 PM   #3
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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:

Last edited by danw; February 11th, 2019 at 07:19 PM.
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