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
This PTG archive page provided courtesy of Moy Piano Service, LLC