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 > > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives >
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