FWIW, that is the difference between accuracy and precision. Dean Dean May cell 812.239.3359 PianoRebuilders.com 812.235.5272 Terre Haute IN 47802 -----Original Message----- From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf Of Ron Nossaman Sent: Monday, January 23, 2006 6:33 PM To: Pianotech List Subject: Re: Humidistat for Wood conditioning box > I found this humidistat that I would use for a wood conditioning box > that seems to be fairly good but expensive ($290). Anyone have any > experience with it or can you suggest one that works as well for less > $$$. It’s the RHC that I’m looking at—scroll down to the second unit. > > http://www.greenair.com/humidistat.htm > > David Love If you're conditioning wood for soundboard building, +-5%RH is pretty miserable accuracy. If you set it at 30%RH and 90°F looking for 6%MC, you could get anywhere from 5.2%-6.7%. Of course, if that's just calibration accuracy, and repeatability within a narrow range is good (which they never seem to think is important enough to mention) you can offset the reading and be pretty close. I assume that's what the mentioned 5% "set differential" is for. So even a cheap humidistat can work well if it makes the same mistake with dependable repeatability. Ron N _______________________________________________ Pianotech list info: https://www.moypiano.com/resources/#archives
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