Uuuuummmmmmm, what's a psycho - motor? Does this detect psychos? At 01:15 PM 1/25/2005, you wrote: >Hi Roger, >If a person has a psychomotor, is there a way to change the hygrometer to >agree. That way, we could check and calibrate them, periodically? >Regards, >John M. Ross >Windsor, Nova Scotia, Canada >jrpiano@win.eastlink.ca >----- Original Message ----- From: "Roger Wheelock" <roger@dampp-chaser.com> >To: "Pianotech" <pianotech@ptg.org>; "College and University Technicians" ><caut@ptg.org> >Cc: "Becky Baldwin" <becky@dampp-chaser.com> >Sent: Tuesday, January 25, 2005 2:01 PM >Subject: Dampp-Chaser hygrometer specs > > >>Hello list, >> >>I have received a few inquiries regarding the accuracy of Dampp-Chaser >>hygrometers. Customers have purchased the units in quantity, set them >>all up to run side by side, and then have become concerned about the >>results. We contacted the manufacturer in Sweden and they verified the >>following information. >> >>Measuring range: 20-95%RH >>Accuracy within 50-70%RH: +/- 3%RH >>Accuracy outside 50-70%RH: +/- 5%RH >> >>I find that these specs are typical for hygrometers priced similarly to >>ours. Unfortunately, 42% RH could be read anywhere from 37%RH to 47%RH >>when read with these instruments. We believe, however, that the >>instruments do measure changes in relative humidity quite accurately. We >>had hoped technicians would use them to show piano owners the variations >>in the piano's environment (maximum versus minimum readings) rather than >>use them as scientific instruments. I use either data loggers or high >>end ($1500 plus) hygrometers in my research. The old saying, you get >>what you pay for, is really true for hygrometers. >> >>Another thing I occasionally do is find myself questioning the reading >>only to realize a little later that it was set on either the max. or min. >>I feel pretty dumb when I figure this out, but thought I would pass it >>along just in case. >> >>Thanks, >> >>Roger >> >> >> >> >> >>_______________________________________________ >>pianotech list info: https://www.moypiano.com/resources/#archives > > >_______________________________________________ >pianotech list info: https://www.moypiano.com/resources/#archives Greg Newell Greg's piano Forté mailto:gnewell@ameritech.net
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