Humidistat Accuracy

[Isaac OLEG]

It may be in the high end of the switching zone.

55% with a high temperature in the room is the same as 42% with a
colder one.

So the only data about RH is not enough for me, as you look (I
presume) for the stability of the wood.

Regards.

Isaac OLEG


> -----Message d'origine-----
> De : pianotech-bounces@ptg.org
> [mailto:pianotech-bounces@ptg.org]De la
> part de Ron Nossaman
> Envoye : lundi 2 decembre 2002 23:15
> A : Pianotech
> Objet : Re: 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
>
>
> Pardon me folks, but while you are busy answering a
> question on using a
> Dampp-Chaser humidistat on a room de-humidifier, wasn't
> Terry's question
> here about a Dampp-Chaser system correctly installed in his
> piano? That's
> how it reads to me, and I'd be curious as to why the heater
> rods aren't on
> at 55% RH too.
>
> Ron N
>
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