Humidistat Performance

[Farrell]

Hi David. Do you have an address, phone #, or URL? Thanks

Terry Farrell
Piano Tuning & Service
Tampa, Florida
mfarrel2@tampabay.rr.com
----- Original Message -----
From: "David M. Porritt" <dporritt@swbell.net>
To: <pianotech@ptg.org>
Sent: Wednesday, March 08, 2000 7:23 PM
Subject: Re: Humidistat Performance


> Terry:
>
> Amprob sells a good one for about $105.00 (the THWD-1.  It really is quite
> accurate.
>
> dave
>
> *********** REPLY SEPARATOR  ***********
>
> On 3/8/00 at 2:39 PM Farrell wrote:
>
> >John:
> >My understanding is that for the humidistat to function as designed, it
> >would switch the dehumidifier on @ 46% RH and switch it off when RH is
38%
> >(or so). If a humidifier was installed, it would switch on @ 38% RH and
> >switch off @ 46% RH. Obviously, if a humidifier is not installed, all
> would
> >be off for the period it takes for RH to increase from 38% to 46% (or
> there
> >abouts). But for all my tests to consistently be hovering around 60% - I
> >just don't understand.
> >
> >My reasoning for this being important to me is this: In Florida, RH in a
> >home drops to a low of approximately 35% during dry winter months (and
> >therefore, I do not see the need for humidification). If the dehumidifier
> >kept the soundboard environment to a maximum RH of around 42% (as
> >advertised), my overall RH range would be about 35% to 45%. Considering
my
> >observations of my humidistat's performance, the RH range for the
> soundboard
> >is about 35% to 62% - not nearly as good as it presumably could be.
> >
> >Don:
> >I have three hygrometers. The one sold by DC, another similar one, and
one
> >that may be a bit better. All three are within 1 or 2 percent of each
> other.
> >I'm thinking of forking over the dough for a real good one. Bob Mair @ DC
> >recommended a couple of units that are more accurate. They run in the
$200
> >to $350 range, depending on features.
> >
> >Terry Farrell
> >Piano Tuning & Service
> >Tampa, Florida
> >mfarrel2@tampabay.rr.com
> >
> >----- Original Message -----
> >From: "John M. Formsma" <jformsma@dixie-net.com>
> >To: <pianotech@ptg.org>
> >Sent: Wednesday, March 08, 2000 10:44 AM
> >Subject: RE: Humidistat Performance
> >
> >
> >> Terry,
> >>
> >> Don't they mention this in the literature? I think I read that this is
> by
> >> design. Something about creating an enviroment that is not suddenly
> >changing
> >> all the time.
> >>
> >> John Formsma
> >> Blue Mountain, MS
> >>
> >>
> >> -----Original Message-----
> >> From: owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org]On Behalf
> >> Of Farrell
> >> Sent: Wednesday, March 08, 2000 9:17 AM
> >> To: pianotech@ptg.org
> >> Subject: Humidistat Performance
> >>
> >>
> >> Hello List:
> >>
> >> I have been monitoring performance of DC humidistats in my shop. I am
> >> finding that the relative humidity (RH) on-off points for the
humidisats
> >> (dehumidifier outlet) are in the 55% to 65% range, rather than
somewhere
> >> centered around 42%. I have done my field testing using several
> different
> >> humidistats. Has anyone else monitored the performance of humidistats?
I
> >am
> >> having trouble understanding why my observations would vary so much
from
> >> what I understand to be advertised.
> >>
> >> Terry Farrell
> >> Piano Tuning & Service
> >> Tampa, Florida
> >> mfarrel2@tampabay.rr.com
> >>
> >>
>
>
>
>
> David M. Porritt
> dporritt@swbell.net
> Meadows School of the Arts
> Southern Methodist University
> Dallas, TX 75275
>
>