RE: CO meters (again)

[Tami Bond <yark@u.washington.edu>]

Bryan,

No confession required, they are not widely used, but they are handy.
Imagine a 6" (or 8") piece of sheet metal duct with a little metal square
suspended inside, with its plane perpendicular to the direction of flow.
In each side of the square, upstream and downstream, is a pressure tap.
The output is two pressure ports, each averaging 4 taps, one upstream and
one downstream. The principle is similar to the S-type pitot tube. The
grid is installed in-line with the duct.

They are not super accurate (10%?) but have some distinct advantages. You
don't have to worry about orientation (already mounted), or traversing,
and they seem to be relatively insensitive to flow that's not fully
developed if you don't have the luxury of 8 or 10 duct diameters
downstream. I think it is good enough for this application.

Tom's idea is cheaper! I don't have a sense of accuracy, though, as flow
through fan will depend on backpressure which increases a little as the
bag is filled. Maybe that doesn't matter.

Tami





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