I should have added the word sling. It is a wet and dry bulb thermometer that you spin. It comes with a slide rule, and tells you the relative humidity, by comparing the dry thermometer reading, with the wet one. John M. Ross Windsor, Nova Scotia, Canada jrpiano@win.eastlink.ca ----- Original Message ----- From: "Greg Newell" <gnewell@ameritech.net> To: "Pianotech" <pianotech@ptg.org> Sent: Tuesday, January 25, 2005 2:28 PM Subject: Re: Dampp-Chaser hygrometer specs > 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 > > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives >
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