🚀 go-pugleaf

In article <1993Jan4.134028.27684@phx.mcd.mot.com>,
schuch@phx.mcd.mot.com (John Schuch) writes:
|>In article <1993Jan4.002944.6494@sequent.com> washer@sequent.com (Jim
"Throw it over the wall" Washer) writes:
|>>I'd like to mount a temp probe on my car to sample the air temp. I'd like
|>>to get as accurate a reading as possible (without exceeding some reasonable
|>>cost).
|>>My biggest concern is getting false reading if the probe gets wet, and reads
|>>too low due to evaporation..
|>>Has anyone done this? Where did you mount the probe... How did you
protect it?
|>
|>I think I'd try either in the trunk, or inside one of the tail-light
|>assemblies first. At sixty miles per hour, the airstream hitting the
|>sensor will cool it nearly as much as being wet. You need to find
|>someplace outside of the airstream, where it wont get wet, and it's
|>not near any heat source.

BZZZT!   He _wanted_ the air temperature -- which means he _wants_ _maximum_
"cooling" of the sensor.

Having done this very thing on a Radio-Shack sort of level, I would recommend
mounting the sensor at the very front of the car, as far in front of the bumper
as you can mount it without being embarrassed at how dorky it looks ;-) .
Direct sunlight will cause an error of 5-10 degrees or more depending on the
color of the sensor and how completely you stop -- this might be remedied by
a shade of some sort to deflect the sunlight.  Can't help much with wet, which
would cause a moderate error in the other direction (from evaporative cooling
of the water) but the sensor would probably stay cooler if mounted high (call
it a creative hood ornament ...)

hope this helps..
                      
<BGB>
lihan@ccwf.cc.utexas.edu        /   The only reason the world hasn't
(really Bruce Bostwick)        /   dissolved into total chaos is that
from the great state of TEXAS /   Murphy's Law also applies to Murphy.