Hi Terry, Please give us a bit more information. I think you have a Boston Piano? Grand? Upright? Bottom Cover (or back cover)? How many dehumidifier rods? How far from soundboard is Humidistat? How far is hum from humidifier? How far is hum from drier bar(s)? Three light kind? Smart Bar? How long did you leave your probe on top of the humidistat? Did you chart against barometric pressure for a true R.H. reading? At 04:15 PM 12/2/02 -0600, you wrote: > >>I have a big pile of copies of a full-color beautiful Damp-Chaser >>marketing handout that describes how the use of their dehumidifier system >>keeps the relative humidity (RH) of the atmosphere in the area of the >>piano soundboard at maximum of 42% RH. Why is it that when I place the >>probe of my NIST-certified 1% accuracy hygrometer on top of my Damp-Chaser >>humidistat, it reads 55% RH? When I place the probe on top of the >>soundboard it reads 55%. When I place the probe in the middle of the room >>where the piano resides, it reads 55%. The heater rods are not warm. The >>atmosphere next to the soundboard should be 42%. The room and everywhere >>else around the piano is 55% RH. The humidistat should turn on >>at.......something near 42% RH. I'm looking at the pretty >>graph: http://www.dampp-chaser.com/main.html It suggests that RH won't >>even come close to 55%. Where is the discrepancy? >> >>Terry Farrell 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
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