Zero percent humidity

[Corte Swearingen]

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                      
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                      01/09/2004 05:15                                                                   
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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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