Haltech temp sensor

[Rob Gallant]

Hi Dan;

The sensor from my Haltech F3 is an LM335.  The stock sensor wasn't reading accurately enough for me.  I
picked up a replacement 335 but went with the options for higher accuracy, wider temp range, and metal
case. (I don't remember exactly what that part number was).  The most direct heat path for these things is
along the wire leads.  The metal case unit was supposed to minimize that problem.  I mounted it inside a
piece of threaded nylon with the case exposed out the end.  This will minimize conduction from the
manifold.

Haltech didn't run any compensation with 335.  I added a trim pot and calibrated the sensor.





> ------------------------------
>
> Date: Thu, 29 Jul 1999 12:06:25 +0800
> From: dzorde at erggroup.com
> Subject: Haltech temp sensor
>
> Hi all,
>
> Have another favour to ask from a friean in the Fiat club.  Has anyone found a
> commercially available sensor that will replace the Haltech air temp sensor.
> This is the temp curve required:
>
> 100C -> 185 ohm
> > 70C -> 450 ohm
> > 38C -> 1,800 ohm
> > 20C -> 3,400 ohm
> > 4C -> 7,500 ohm
> > -7C -> 13,500 ohm
> > -18C -> 25,000 ohm
> > -40C -> 100,700 ohm
>
> I would have thought Haltech would use something commercially available, VDO
> sensor, Bosch sensor, nippon denso sensor ?
>
> Dan  dzorde at erggroup.com
>
> ------------------------------

--
Rob
MailTo:Rx7Rob at ibm.net