>I rode from the hotel in Dallas to the Airport with the guy from that >company. He told me a bit about it on the way. Most any silica gel thingee >I have ever seen simply has an ability to absorb water from the air. Once >saturated with water, it then needs to be thermally desorbed. The >difference with this gizzmo is that it has a RH level at witch it will be >in equilibrium with the surrounding atmosphere (don't remember if this was >42% - but some piano-friendly RH), i.e. it will neither absorb nor desorb >water. If the RH in the surrounding atmosphere rises, the unit absorbs >water, and thus lowering atmospheric RH. When the RH drops below the >equilibrium RH, the unit will desorb the water and raise atmospheric RH. > >Now what happens when you have 80% RH in the room, an air exchange between >the piano interior and the room air - I suspect that at some point the bag >of stuff would get saturated - maybe you can just ring it out? Sounded >like it had some potential. I don't know what the medium is, but I found something along these lines when I was looking for calibration methods for hygrometers. http://www.natmus.dk/cons/tp/satslt/satsalt.htm For what it's worth. Ron N
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