Re: Hood Airflow Measurements

[Ccja@aol.com]

Ninni

It's not entirely clear what you mean by "hood airflow measurements". If
you're asking about an instrument that just sits there and serves as a
reference to tell you if the hood is functioning properly, a velometer is an
appropriate instrument. Probably anything that you pick out of, say, the
Cole-Parmer catalog (800-323-4340, but most biomedical research labs seem to
have it on their shelves), or the Lab Safety Supply catalog (800-356-0783)
will do. But, if you're going to make the calibrated, periodic (e.g., annual)
set of measurements, across the face of the hood, to set, or verify, that the
average flow rate is as it should be (nominally 100 linear feet/min), you
should use a thermoanemometer.

I recommend those made by Kurz Instruments, 2411 Garden Rd, Monterey, CA
93940; 800-424-7356. They come in a range of pricing from <US$500 to >$2000,
in both digital and analog versions. Note that the latter decision is not a
trivial one, and should be carefully considered; I suggest demoing one of
each type. They come with carrying cases, probe shields, etc., and are very
rugged, accurate, and reliable.

Good luck,
chris alston
ccja@aol.com