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Units issue: SCFM and CFM both converted to ft3/min


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In situations where process historian tags have units of "scfm" (standard cubic feet per minute) and "cfm" (cubic feet per minute), both are converted to "ft3/min" in SEEQ.

This is incorrect, as those are both different units.  "scfm" is a unit of molar flow.  "cfm" (or less ambiguously "acfm" for "actual cubic feet per minute") is a unit of volume flow, which is what "ft3/min" implies.

In practice, the historian shouldn't use "cfm", as that's ambiguous, and there are times it's used to mean scfm and other times it's used for acfm.  Though that's more an issue with the historian than SEEQ.  I would personally find it nice for all three of scfm/acfm/cfm to appear differently in SEEQ, so that I can identify situations where cfm is ambiguous.  But at the least scfm should be a different unit than the other two; I would suggest something like scfm be left as "scfm" in SEEQ.

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  • 5 weeks later...
  • Seeq Team

Thanks for the feedback Lee. As you've noted Seeq currently doesn't differentiate these different units primarily because standard varies based on process conditions. We're working on ways to improve our unit handling, so if you want to be notified about updates, feel free to send a email to support@seeq.com and we'll log a ticket for you.

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