Zero percent humidity

[Corte Swearingen]

Ok.  I'll let you buy the $500 hygrometer.

Corte Swearingen
Chicago


                                                                                                        
                      Chris Gregg                                                                       
                      <cdgregg@telus.ne        To:       Pianotech <pianotech@ptg.org>                  
                      t>                       cc:                                                      
                      Sent by:                 Subject:  Re: Zero percent humidity                      
                      pianotech-bounces                                                                 
                      @ptg.org                                                                          
                                                                                                        
                                                                                                        
                      01/09/2004 10:53                                                                  
                      AM                                                                                
                      Please respond to                                                                 
                      Pianotech                                                                         
                                                                                                        
                                                                                                        




My only comment is that if you have extremes in humidity as indicated by
the fluctuation apparent in a piano's performance, it is good to have an
accurate instrument to back up your findings.

Chris Gregg

At 06:42 AM 1/9/2004, you wrote:





>I agree - a low cost 3% accuracy instrument should be fine for tracking
>changes in humidity in a customer's home over time.  For use in a
>customer's home, I would argue that it is the repeatability that is more
>important than the actual accuracy of the instrument.  Sensor linearity is
>also important but no matter what the sensor make-up, all sensors start to
>become non-linear at the extreme ends of the scale (as has already been
>discussed).
>
>Practically speaking, you want to pay for an instrument with reasonable
>accuracy (3-5% full-scale) and even better repeatability (0.5 to 1%
>full-scale).  An instrument at this level can be purchased in the $50 to
>$100 range.  I don't see a need to purchase anything more expensive for
use
>in tracking humidity levels in a customer's home.
>
>Corte Swearingen
>Chicago
>
>
>
>
>                       Richard
> Brekne
>                       <Richard.Brekne@gr        To:       Pianotech
> <pianotech@ptg.org>
>                       ieg.uib.no>               cc:
>
>                       Sent by:                  Subject:  Re: Zero
> percent humidity
>                       pianotech-bounces@
>
>                       ptg.org
>
>
>
>
>
>                       01/09/2004
> 05:15
>                       AM
>
>                       Please respond
> to
>                       Pianotech
>
>
>
>
>
>
>
>
>
>Hi humidity freaks :)
>
>Just curious... shop use for building is one thing, but in advising
>customers at home, DC use, and other less critical applications... I
>generally just have one of those 5 dollar digi-hygrometers in my bag.
>Supposed to be good for +/- 3 % RH in the range of 23% to 90 %. I
>generally point out that anything  under 30 % is just plain too dry, and
>anything over 70% is just plain to wet.
>
>Is there any reason for needing more accuracy in these kinds of
>instances that I should know about ?
>
>Cheers
>RicB
>
>Farrell wrote:
> >
> > What kind of an instrument are you using to measure RH @ less than 20%?
> >
> > Terry Farrell
> >
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>
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