>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 Pardon me folks, but while you are busy answering a question on using a Dampp-Chaser humidistat on a room de-humidifier, wasn't Terry's question here about a Dampp-Chaser system correctly installed in his piano? That's how it reads to me, and I'd be curious as to why the heater rods aren't on at 55% RH too. Ron N
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