Dampp-Chaser hygrometer specs

[Greg Newell]

John,
         I was just pokin a bit for fun. I believe (without looking it up) 
that the item is a sling psychrometer. You just left out the "r". It was an 
opportunity and I took it! :-)

Best,
Greg



At 01:42 PM 1/25/2005, you wrote:
>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
>
>
>_______________________________________________
>pianotech list info: https://www.moypiano.com/resources/#archives

Greg Newell
Greg's piano Forté
mailto:gnewell@ameritech.net