Humidistat Accuracy

[Farrell]

RH is everything. If something reacts at 42% RH or 55% RH, that is independent of temperature.

Terry Farrell
  
----- Original Message ----- 
From: "Isaac OLEG" <oleg-i@wanadoo.fr>
To: "Pianotech" <pianotech@ptg.org>
Sent: Monday, December 02, 2002 5:29 PM
Subject: RE: Humidistat Accuracy


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