Re: Where to mount an outside temp probe on a car?

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Article #16233

#16233

From: Daniel Rubin
Date: Tue, 05 Jan 1993 05:05

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>>BZZZT!   He _wanted_ the air temperature -- which means he _wants_ _maximum_
>>"cooling" of the sensor.
>>
>
>Excuse me but if you cool the sensor by placing it in an airstream, your
>not reading the actual temperature of the air. Reading a sensor cooled
>by an airstream, by itself, tells you nothing. If you measure one sensor
>in an airstream and another one nearby but shielded from the air stream,
>you can determine the speed of the airstream. Other than that, I don't
>know why you would want to cool the sensor.

Hmmm...  You cannot get the probe any cooler than the temperature of the 
air flowing around it no matter how fast the air is flowing!  If anything
the friction of the air moving across the sensor would heat it up.  Now if
it is wet then the air will aid to evaporate the water on the sensor which
takes heat of evaporation from the sensor thereby lowering it's temperature.
Dry air flow around the sensor will not provide false readings unless 
excessive friction is created!  

							      - Dan
-- 

             Daniel Joseph Rubin     rubin@cis.ohio-state.edu 
     
                       GO BENGALS!      GO BUCKS!

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References: <1993Jan4.134028.27684@phx.mcd.mot.com> <86134@ut-emx.uucp> <1993Jan4.223650.9171@phx.mcd.mot.com>

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From: rubin@clam.cis.ohio-state.edu (Daniel Rubin)
Subject: Re: Where to mount an outside temp probe on a car?
Message-ID: <1993Jan5.050543.28601@cis.ohio-state.edu>
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Organization: The Ohio State University Dept. of Computer and Info. Science
References: <1993Jan4.134028.27684@phx.mcd.mot.com> <86134@ut-emx.uucp> <1993Jan4.223650.9171@phx.mcd.mot.com>
Date: Tue, 5 Jan 1993 05:05:43 GMT
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