Data logger

[Farrell]

You can have a hygrometer calibrated: http://www.troemner.com/cal_humidity.htm

Or you can by one that has been tested to meet certain standards.

Also, look at the specs for your hygrometer, most have a limited range of relative humidity for their stated accuracy - accuracy falls off at very high or low levels.

Terry Farrell
  ----- Original Message ----- 
  From: John Musselwhite 
  To: Pianotech List 
  Sent: Thursday, April 26, 2007 10:45 PM
  Subject: Re: Data logger


  At 07:16 PM 4/25/07, Marcel wrote:


    Hello,

    I've not used this one but have heard good reports about it. The price is
    right

    Check their website at:  http://www.microdaq.com/lascar/el-usb-2.php

  I have one (it's a Measurement Computing USB-502) and use it a fair amount, mostly in churches and the concert hall I look after, but I've left it in homes as well occasionally. Find it at:
    http://www.measurementcomputing.com/cbicatalog/USB-502.asp?dept_id=414&pf_id=1759

  It seems to work well, but it gives me dramatically different readings from those taken with my digital psychrometer, a Cooper SRH122. While the USB-502 can give me stored readings lately of  around 20% RH the Cooper has told me it's more like 10%-12%. One church with a C7 I look after read in the high teens on the USB, but the Cooper said it was 3.8% (+-4%) at the piano! The Cooper can be found at: 
  http://www.tempsensor.net/modules.php?op=modload&name=News&file=article&sid=406

  A Dampp-Chaser with two tanks is being installed on that C7 next week. 

                   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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