This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment I guess they do that so that it isn=92t clicking on and off constantly. = If you set it for 30% I imagine it takes it down to 30% and then shuts off. = It doesn=92t turn on again until it hits 35%. You could set it 2.5% below = your target which would have it fluctuating 2.5% above and 2.5% below and = give you an average RH over time of your target. Since it takes a certain = amount of time for the wood to lose or gain moisture you would expect the range = of the corresponding EMC to be somewhat less than 5% which would put it in = an acceptable range of your target, I would presume. That=92s, of course, assuming that they are accurate. =20 =20 David Love davidlovepianos@comcast.net=20 -----Original Message----- From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On = Behalf Of Farrell Sent: Monday, January 23, 2006 4:05 PM To: Pianotech List Subject: Re: Humidistat for Wood conditioning box =20 That web site states "The differential between the on and off points is fixed at 5% RH", which means the environment will vary 5%, depending on where it is in the on/off cycle. A decent thermostat will keep the environment within a degree or so and thus keeps the RH next to = perfectly constant.=20 =20 I had considered this subject humidistat and others also. I'm glad I = stuck with the simple thermostat. It reall is easy to use and works very well. =20 Terry Farrell =20 ----- Original Message -----=20 =20 >> I found this humidistat that I would use for a wood conditioning box=20 >> that seems to be fairly good but expensive ($290). Anyone have any=20 >> experience with it or can you suggest one that works as well for less = >> $$$. It=92s the RHC that I=92m looking at=97scroll down to the = second unit.=20 >>=20 >> <http://www.greenair.com/humidistat.htm> http://www.greenair.com/humidistat.htm >>=20 >> David Love >=20 >=20 > If you're conditioning wood for soundboard building, +-5%RH is=20 > pretty miserable accuracy. If you set it at 30%RH and 90=B0F looking=20 > for 6%MC, you could get anywhere from 5.2%-6.7%. Of course, if=20 > that's just calibration accuracy, and repeatability within a narrow=20 > range is good (which they never seem to think is important enough to=20 > mention) you can offset the reading and be pretty close. I assume=20 > that's what the mentioned 5% "set differential" is for. So even a=20 > cheap humidistat can work well if it makes the same mistake with=20 > dependable repeatability. >=20 > Ron N ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/26/24/5a/97/attachment.htm ---------------------- multipart/alternative attachment--
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