Low Flow Anemometer

[Stoker]

I am looking for a hot wire anemometer to measure air speed. The speed range required goes down to 20 feet/minute (0.25 foot/s, 0.076 m/s). I am having trouble finding a meter that is calibrated down to this flow speed. Any suggestions for meters that can accurately measure air speed in this range?

 

[DRWeig]

First, is there an opportunity to somehow insert a duct run of smaller cross-section to get the flow up for better measurement?

If not, any hot wire will give you a reading at 20 fpm. It should be repeatable if not very accurate. If your duct is big enough, a directional wind speed device of national weather service quality will do it. They employ an array of hot wires and give accurate data down to 2 MPH or 3 feet per minute. Contact Vaisala, they're the tops in my opinion.

Best to you,

Goober Dave

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