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- Path: sparky!uunet!cs.utexas.edu!ut-emx!ccwf.cc.utexas.edu!lihan
- From: lihan@ccwf.cc.utexas.edu (Bruce G. Bostwick)
- Newsgroups: sci.electronics
- Subject: Re: Where to mount an outside temp probe on a car?
- Message-ID: <86134@ut-emx.uucp>
- Date: 4 Jan 93 18:49:05 GMT
- References: <1993Jan4.002944.6494@sequent.com> <1993Jan4.134028.27684@phx.mcd.mot.com>
- Sender: news@ut-emx.uucp
- Reply-To: lihan@ccwf.cc.utexas.edu (Bruce G. Bostwick)
- Lines: 37
-
- 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.
-