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Re: [humidity gauges]
From: Kevin Christiansen[SMTP:kevin+-at-cs.cmu.edu]
Sent: Tuesday, December 09, 1997 10:57 AM
To: Tesla List
Subject: Re: [humidity gauges]
At 11:35 PM 12/6/97 -0600, you wrote:
>
>From: Jim Lux[SMTP:jimlux-at-earthlink-dot-net]
>Sent: Saturday, December 06, 1997 11:30 AM
>To: Tesla List
>Subject: Re: [humidity gauges]
>
>
>> A few months ago Fair Radio Sales, Lima, OH, had some nice 6 inch dia.
>> humidity gauges for about $10. We added one to the lab wall about 3
>years
>> ago and it works great -- use it more for checking performance on Van de
>> Graaffs than on TC's, but you can always check the RH in your lab and the
>> cost if reasonable.
>
>Radio Shack also has battery powered hygrometer/thermometer combinations
>for about $20. We make clouds and fog a lot at work, and find that the RS
>units work just fine for standardizing conditions. Of course, they aren't
>sensitive to glycol vapors which is what we use for some fog, but, oh
>well...
>
If you want precision at low humidities, the Radio Shack unit doesn't
cut it. I can't get my Radio Shack unit to read less than 19% humidity
no matter what I do (and that includes enclosing it in a jar with
1/4 pound of just-dried anhydrous calcium sulphate, which is a very
powerful dessicant).
Just so you know....
- Kevin Christiansen
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Kevin D Christiansen
Human Computer Interaction Institute - Carnegie Mellon University
kevin-at-cs.cmu.edu http://www.cs.cmu.edu/~kevin/
"The universe is composed of space, galaxies, and intergalactic
dust. Galaxies themselves are composed of space, stars, and
interstellar dust. From the omnipresence of dust, we conclude
that nature abhors a vacuum and won't pick up a broom, either."
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