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 > >
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