Hi Don, Our current specifications have average calibrations as follows: Dry - 38.5% RH Normal - 45% RH Wet - 51% RH The average range between upper and lower set point is 4% for our newer models. Note that these results are recorded in a humidity and temperature controlled test chamber certifiable to a primary national standard. There is very little air movement in the switch recording area of the chamber and the humidity increases and decreases very slowly. This means variation can occur in the field, particularly in a grand piano where air movement can be substantial. The 42% is a hold over from the good old days at Dampp-Chaser. Once we began selling in so many different countries (37 as of 2004) we had to adopt the specifications that would cover many markets with three basic units. Our current mix is about 1% dry, 80% normal and 19% wet. Hope this helps, Roger ----- Original Message ----- From: "Don" <pianotuna@accesscomm.ca> To: "Pianotech" <pianotech@ptg.org> Sent: Wednesday, January 05, 2005 1:29 PM Subject: Re: humidistat > Hi Roger, > > I'd love to have the "numbers" for the wet and dry--my recollection is that > dry is 36% and wet is 50%. Your mileage may vary.... > > At 12:50 PM 05/01/2005 -0500, you wrote: > >Hi Sarah, > > > >We are currently selling humidistats with three calibrations, wet, normal > >and dry. The wet humidistat has a higher set point and is designed for > >pianos who have spent most of their lives in humid environments, e.g. Hawaii > >and Florida. These work well with gray market pianos, too. Normal units > >are designed for pianos that have seen dry winters and humid summers. Dry > >units are designed for pianos that have been exposed to dry environments for > >long period of time, e.g. New Mexico and Arizona. I do not have the exact > >specifications in front of me, but can post them later if anyone is > >interested. I have some other commitments the rest of the day and need to > >get off the internet. > > > >Roger > > > >----- Original Message ----- > >From: "Sarah Fox" <sarah@graphic-fusion.com> > >To: "Pianotech" <pianotech@ptg.org> > >Sent: Wednesday, January 05, 2005 11:54 AM > >Subject: Re: humidistat > > > > > >> ... and one wonders what is the magic of 42%? I know it's heresy, but > >could > >> it be that other setpoints may be more appropriate for certain > >> pianos/environments? If a piano has been accustomed to a high humidity > >> environment for the past several decades, is it really smart to dry it out > >> to 42%? If a piano has been used to living in the desert, it is > >necessarily > >> smart to humidify it to 42%? In the end, shouldn't the goal be to find a > >> humidity at which both the client and the piano are happy and to lock it > >in? > >> After all, is it not the *changes* in humidity that bring about damage and > >> instability, rather than the humidity itself??? > >> > >> Perhaps instead of having an unadjustable unit or a unit with a knob on > >the > >> front for easy adjustment, you should make your units adjustable with a > >> screwdriver. ;-) > >> > >> Peace, > >> Sarah > >> > >> > >> > >> ----- Original Message ----- > >> From: "David Love" <davidlovepianos@comcast.net> > >> To: "'Pianotech'" <pianotech@ptg.org> > >> Sent: Wednesday, January 05, 2005 11:36 AM > >> Subject: RE: humidistat > >> > >> > >> > Hello Roger: > >> > > >> > I use the DC products without any complaint or need to find a > >> > substitute. I was thinking more for a wood conditioning cabinet than > >> > for a piano. But now that you bring it up, it would be nice if DC made > >> > a dial up unit compatible with their products for just such a purpose. > >> > What's the possibility of that? > >> > > >> > David Love > >> > davidlovepianos@comcast.net > >> > > >> > -----Original Message----- > >> > From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On > >> > Behalf Of Roger Wheelock > >> > Sent: Wednesday, January 05, 2005 8:28 AM > >> > To: Pianotech > >> > Cc: Gayle Mair > >> > Subject: Re: humidistat > >> > > >> > Hi David, > >> > > >> > I use this unit in one of our test rooms at the factory. (I need to > >> > control > >> > the test room at various extremes of relative humidity.) The dial > >> > readings > >> > are not particularly accurate so a good hygrometer is needed for > >> > calibration. I think it would work fine in the shop but not for a > >> > piano. > >> > Years ago we decided not to build a dial-up unit. We think a piano > >> > owner > >> > might adjust the dial and then either over dry or over humidify the > >> > piano. > >> > Our fear is that the piano owner would then file a claim against us for > >> > the > >> > damage. Maybe we are a bit paranoid, but we pride ourselves on never > >> > having > >> > an insurable product liability claim in the 57-year history of the > >> > company. > >> > > >> > Conversely, we have thought about selling our humidistat into the > >> > greenhouse > >> > market. If I remember correctly that Greenair product is kind of > >> > expensive. > >> > > >> > Roger Wheelock > >> > Dampp-Chaser Corp. > >> > > >> > > >> > > >> > ----- Original Message ----- > >> > From: "David Love" <davidlovepianos@comcast.net> > >> > To: "'Pianotech'" <pianotech@ptg.org> > >> > Sent: Wednesday, January 05, 2005 10:31 AM > >> > Subject: humidistat > >> > > >> > > >> >> Found this product recently. It will support dampp-chaser products > >> > and > >> >> can be dialed to the desired humidity level. > >> >> > >> >> http://www.greenair.com/humidistat.htm > >> >> > >> >> David Love > >> >> davidlovepianos@comcast.net > >> >> > >> >> > >> >> > >> >> _______________________________________________ > >> >> pianotech list info: https://www.moypiano.com/resources/#archives > >> >> > >> >> > >> > > >> > > >> > _______________________________________________ > >> > pianotech list info: https://www.moypiano.com/resources/#archives > >> > > >> > > >> > _______________________________________________ > >> > pianotech list info: https://www.moypiano.com/resources/#archives > >> > > >> > > >> > >> > >> _______________________________________________ > >> pianotech list info: https://www.moypiano.com/resources/#archives > >> > > > > > >_______________________________________________ > >pianotech list info: https://www.moypiano.com/resources/#archives > > > > > > Regards, > Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T. > Non calor sed umor est qui nobis incommodat > > mailto:pianotuna@accesscomm.ca http://us.geocities.com/drpt1948/ > > 3004 Grant Rd. REGINA, SK, S4S 5G7 > 306-352-3620 or 1-888-29t-uner > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives > >
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