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 > > 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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