Humidistat Accuracy

[Isaac OLEG]

May be Damp chaser changed something in their model lately ?

I've send back one unit yet, but I don't installed so many, only one
system recently and it seem to work, even if it begin with higher
humidity that you describe.

I checked yet a unit with the electronic hygrometers I have and it was
10% 15% accurate env. don't remember the exact numbers
In a fluctuation situation, that should work enough well I guess.

Regards.

Isaac OLEG



> -----Message d'origine-----
> De : pianotech-bounces@ptg.org
> [mailto:pianotech-bounces@ptg.org]De la
> part de Farrell
> Envoyé : dimanche 1 décembre 2002 03:30
> À : pianotech@ptg.org
> Objet : Humidistat Accuracy
>
>
> I have a big pile of copies of a full-color beautiful
> Damp-Chaser marketing handout that describes how the use of
> their dehumidifier system keeps the relative humidity (RH)
> of the atmosphere in the area of the piano soundboard at
> maximum of 42% RH. Why is it that when I place the probe of
> my NIST-certified 1% accuracy hygrometer on top of my
> Damp-Chaser humidistat, it reads 55% RH? When I place the
> probe on top of the soundboard it reads 55%. When I place
> the probe in the middle of the room where the piano
> resides, it reads 55%. The heater rods are not warm. The
> atmosphere next to the soundboard should be 42%. The room
> and  everywhere else around the piano is 55% RH. The
> humidistat should turn on at.......something near 42% RH.
> I'm looking at the pretty graph:
> http://www.dampp-chaser.com/main.html  It suggests that RH
> won't even come close to 55%. Where is the discrepancy?
>
> Terry Farrell
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