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Re: humidity sensors

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

Run another temperature probe with a wick immersed in water, and a little
fan blowing on it, and you can calculate humidity from the standard
psychometric equations...

(of course, the solid state probe is way cooler....!)

There are also inexpensive analog humidity sensors.. 

Tesla list wrote:
> Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
> Hi Jim,
> What a cool thing!  I have been looking for a way to measure humidity in
> the QVAR experiment.  This might be just the ticket.
> http://hot-streamer-dot-com/bob/qvar/results/expt6/index.html
> You can see the effects of humidity and temperature on my small coil's
> secondary with a 4 by 13 inch John Freau top terminal.  I have a nearby
> temperature probe but we are using a weather station for humidity.  You can
> see how a little rain/snow dropped the Q of the coil about 5PM on May 1st.
> It appears operating a coil in a wet environment with a wet roof and damp
> surroundings can really drop a coil's Q!  Humidity is a BIG factor!
> Cheers,
>         Terry
> At 09:55 AM 5/2/2002 -0700, you wrote:
> >For those wishing to carefully characterize their coil operating
> >environments...
> >
> >Sensirion is advertising a digital humidity sensor with 2 wire interface,
> >calibrated, etc.  And, a free sample!
> >
> >http://www.sensirion-dot-com
> >