They have circuitry to keep the temperature (or resistance) of the hot
wire at a certain level with more current as the air flows past, and all
that correlates to how much heat is being removed by the airflow
(science!), which correlates to the speed of the air flow (the "wind
chill," sorta). There is some aspect to do with the temperature of the
airflow, I forget what it is.
Back in college in my NASA summer internships we had those in the
hypersonic wind tunnels to measure the airspeed, and I think in the
other wind tunnels in general. That is a great deal on that instrument.
--R
On 1/22/14 10:22 AM, Craig wrote:
On Wed, 22 Jan 2014 06:38:17 -0800 Jim Cathey <j...@windwireless.net>
wrote:
Speaking of that, I just yesterday got an air velocity meter
at the thrift shop. It works by measuring the wind chill
on a heated probe. Range from about 2 feet/minute to
12,000 feet/minute, or 136 MPH, in three ranges. Seems
to be working. It's intended for HVAC ducting measurements.
It a hot-wire anemometer. Those are nifty devices.
136 mph in a HVAC duct seems a little excessive....
I love tools. This one was $13. With case, charger,
manual (including theory of operation and schematic).
Kurz model 443.
Such a deal!
Craig
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