[CAUT] Hygrometers

[Marcel Carey]

As the sling is dangerous due to the mercury, it is possible to use medical digital thermometers instead of the mercury one. The important thing is the difference between the wet and dry one with the chart.

But, for our needs in the field, most modern digital hygrometers are a lot better than the pring ones customers usually have. I carry one that I put on the piano as I start my tunings and read it when I'm done. Weather the actual #s are within the 5% range is not that important IMO.

Marcel Carey, RPt
Sherbrooke, QC
________________________________
> To: ed440 at mindspring.com; caut at ptg.org
> From: pwilliams4 at unlnotes.unl.edu
> Date: Fri, 16 Nov 2007 07:40:20 -0600
> Subject: Re: [CAUT] Hygrometers
> 
> 
> Are the sling style the ones one would whirl around your head on a string?  Richard had one of those, but accidently broke it in the shop years ago and hasmet had to be called in for the mercury clean up.  I wouldn't want those.  The Cooper looks interesting...
> 
> We do have extrememely dry conditions in the cold Nebraska winters, and very high humidity in summers; but the facilities across campus opens a steam duct system that goes to every building on campus, I don't think there is much adjusting that can be made.  It's either on or off.  Very old and antiquated.  We're working on getting a new building someday (pipe dream, of course ;>)
> 
> Thanks
> 
> Paul
> 
> 
> 
> "Ed  Sutton" 
> Sent by: caut-bounces at ptg.org
> 
> 11/15/2007 05:23 PM
> Please respond to
> Ed  Sutton ; Please respond to
> College and University Technicians 
> 
> To
> "College and University Technicians" 
> cc
> Subject
> Re: [CAUT] Hygrometers
> 
> 
> 
> 
> 
> How about the "Professional" meter that Pianotek sells?
> I like it because it reads quickly and reads lower RH than the Radio Shack types.
> I haven't compared it to a sling psychrometer. The sling psychrometers I have found were rather expensive.
> Ed Sutton
> 
> ----- Original Message -----
> From: John Musselwhite
> To: College and University Technicians
> Sent: Thursday, November 15, 2007 4:41 PM
> Subject: Re: [CAUT] Hygrometers
> 
> At 12:42 PM 11/15/07, Paul wrote:
> 
> Hi List,
> 
> I have a couple of those cheap  max-min thermo-hygro readers from Pianotek.  I'm not sure if they're very accurate.
> 
> They're more accurate than the Radio Shack ones, but I don't think by much.
> 
> If you all remember, last fall/winter I sent in some photos of one of our recital rooms that Richard West took before I got here with the fog and water dripping all over everything.  It hasn't been that bad since I've been here, but the last couple of times I've gone in there this past week, it feels really muggy, but the hygrometer only registers 40-45% (which would be ideal).  Any suggestions on who makes a real accurate reader?
> 
> We have the opposite problem here where Rh can be down into the single digits in mid-winter. None of the "standard" humidity gauges go down that far. I use a Cooper Digital Psychrometer much like the one down the page at http://www.techinstrument.com/acatalog/Hygrometers__RH___humidity_.html   (SAMJR995). It's a digital version of a "sling psychrometer", the wet/dry bulb unit we use to make truly accurate RH readings. While it's supposedly accurate +-5% it still reads down to zero Rh which in worst case might actually be 5%. I've read as low as 3% in mid-winter here in some churches. In those pianos with DC's installed, sticking it under the rim for a minute and pressing the "hold" button shows it's in the 40-43% range at the soundboard even with extremely low humidities outside the instrument.
> 
> I also have a USB recording hygrometer that will track the RH and temp over a long period of time. It's at http://www.measurementcomputing.com/cbicatalog/USB-502.asp?dept_id=414&pf_id=1759 . It reads very much like the "standard" units and differs from the Psychrometer's readings. I trust the Cooper more for truly accurate readings.
> 
>                 John
> 
> -------------------------------
> John Musselwhite, RPT  -  Registered Piano Technician
> Musselwhite Piano Services - Calgary, Alberta Canada
> Office/cel (403) 246-7717 Fax (403) 255-5268
> Outside of Calgary call Toll Free:  1-866-95-PIANO (1-866-957-4266)
> "Three Generations of Experience"

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