Humidistat Accuracy

[Farrell]

It is indeed rated for high wattage units like a stand alone dehumidifier. I don't have a DC humidistat in front of me, but it has an amp rating. I seem to recall they are rated up to 600 watts at 120 volts. The dehumidifier power consumption (500-some watts) is just below the rating for the humidistat - so that should be OK. 

I bought a Pacer Model DH50 (Digital Hygro-Thermometer), http://www.pacer-ind.com/hygrometers/dh50.html  The specs say accurate to within 2%, but reportedly, most units test to within 1% accuracy. The test results that came with mine indicate that it was within 0.7% accuracy RH, over the operational scale range of 5% to 95% RH. I will send it to the manufacturer on a yearly basis for recalibration.

Terry Farrell
  
----- Original Message ----- 
From: "Don" <pianotuna@accesscomm.ca>
To: "Pianotech" <pianotech@ptg.org>
Sent: Sunday, December 01, 2002 1:13 PM
Subject: Re: Humidistat Accuracy


> Hi Terry,
> 
> One reason you are getting weird readings is that the dc controller was
> never intended for high wattage units like stand alone dehumidifiers. I
> suspect that each time the unit cycles the contacts inside "weld"
> themselves together giving you a much higher *off* cycle.
> 
> Where did you get your "high end" humidstat?
> 
> At 10:16 AM 12/1/02 -0500, you wrote:
> >The sling hygrometer is fine for the room RH, but not much use to
> determine the RH right next to the underside of the soundboard (unless you
> have a 9' Brambach with no framing!). Before I bought my high-end
> hygrometer, I had run my shop dehumidifier off several regular DC
> humidistats and several "DRY" DC humidistats. The regular ones would turn
> the dehumidifier on around 60% to 65%. The "DRY" ones would be a bit
> better, switching the dehumidifier on in the upper 50%s.
> 
> Regards,
> Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T. Tuner for the Center of
> the Arts
> 
> mailto:pianotuna@accesscomm.ca
> 
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> 
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