circuit to use GM temperature sensors for voltage based data acquisition input?

[Dave Zug]

If you do not have to have an exact screw-in fit (as in putting sensors on
both sides of an intercooler, sensors strapped onto tranny supply and return
lines etc) , there are standard epoxied thermisters available for about nine
bucks a piece.  a little thermal-conductive compouns between the bead and
the tranny line works great.  They use either a 10k standard (10K ohms at 77
degrees F) or a 3k standard, and are NOT linear (as are not the GM ones).
another alternative is RTD's  - they are linear but expensive.  Try "Kele
and associates" for the bead thermisters and maybe some other goodies.. they
sell "controls" stuff.  the 10K and 3k thermisters are converted to voltage
using a clean power supply and a pull-up resistor. again.. not linear... and
a limit of maybe 240 degrees. cool to see the delta across an intercooler
;-)

----- Original Message -----
From: <bcroe at juno.com>
To: <gmecm at diy-efi.org>
Sent: Thursday, March 08, 2001 4:03 PM
Subject: circuit to use GM temperature sensors for voltage based data
acquisition input?


> Jason, Can you give me the sensor resistance at the
> temperature you want 10 volts out, and for zero volts,
> and a few points in between?  If so, I might be able to
> cook up an op amp circuit to do it.  12v supply ought
> to work if it is clean.  If not regulated, another voltage
> reference will be needed
>
> Bruce Roe, Electrical engineer working with mechanical systems
>
> On Thu, 8 Mar 2001 16:06:37 -0500 "Jason R. Haines"
> <jhaines at lingenfelter.com> writes:
> > Does anyone know what I need to do to build a circuit to be able to
> > take
> > standard GM temperature sensors (IAT, ECT, oil temp.) and produce a
> > 0 to 10
> > volt output for our data acquisition system. We currently have 12
> > vdc and
> > 13.8 vdc power available although we could add some other DC power
> > supply if
> > needed.
> >
> > Sorry if this seems basic but that is what happens when you let
> > mechanical
> > engineers start working with electronics and electrical systems.
> >
> > Thanks,
> >
> > Jason
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