[CAUT] Hygrometers

[Leslie Bartlett]

So, where in Walmart does one go to find such a thing?   And is there anyone
there who would know what a "thermo-hygrometer" is?
thanks
les bartlett

  _____  

From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of
Barbara Richmond
Sent: Thursday, November 15, 2007 9:07 PM
To: College and University Technicians
Subject: Re: [CAUT] Hygrometers


Dang!
 
br

----- Original Message ----- 
From: Jeannie  <mailto:jcgrassi at earthlink.net> Grassi 
To: 'Ed Sutton' <mailto:ed440 at mindspring.com>  ; 'College and University
Technicians' <mailto:caut at ptg.org>  
Sent: Thursday, November 15, 2007 8:50 PM
Subject: Re: [CAUT] Hygrometers


Hi Ed, Paul, et al,

I recently bought one of the "Professional" hygrometers from Pianotek
because I had heard the same comments from several other people.  Well, for
the past two months I've been using it side by side along with a
Dampp-chaser hygrometer a/o ones that my clients happen to be using.  I'd
like to say that the small difference in RH that it reads hardly amounts to
anything.  AND..it takes quite a while (like five minutes) to settle down
and give an accurate reading from what it registered in my case, in my car,
traveling from the last appointment.  

 

At first I would smugly take a reading off of it immediately and was
surprised at what a different result it gave from what was in the piano.  I
congratulated myself on upgrading my tool and being a true "professional.
However, one time I just let it sit there while I was tuning and noticed how
much it changed until it ended up with almost the same as the one in the
piano.  I observe this every day now.  And I'm asking myself why I spent all
of that extra money.  One client proudly showed me his thermo-hygrometer
(with memory) that he bought at Walmart for $6.  It read the same as my
fancy-schmancy "professional" one.  

 

Comments?  ;>)

jeannie

 


  _____  


From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Ed
Sutton
Sent: Thursday, November 15, 2007 3:05 PM
To: College and University Technicians
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  <mailto:john at musselwhite.com> Musselwhite 

To: College and University  <mailto:caut at ptg.org> 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
<http://www.measurementcomputing.com/cbicatalog/USB-502.asp?dept_id=414&pf_i
d=1759> &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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