I am confused.

I have a pitot tube air flow element.

To calculate cfm, I do a little math, then the cfm equation calls for =
the air density to calculate the CFMs.=20

If I just read the cfms without entering the air density, my readings =
through a test sharp edge orifice appear to remain constant, no matter =
what the actual  air density is.

If I add in the actual air density to the equation, my cfm readings go =
up with lower air density and go down with higher density.

So, can I assume that the readings without the air density calculated in =
are SCFM, and the readings with air density calculated in are ACFM. I =
just can't see this as possible.

Thanks

John

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