Humidistat for Wood conditioning box

[Dean May]

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
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