Mike Smith wrote:

> >We build automotive sensors which use IR LED's. The sensor sits in the oil
> >pan or the radiator, so the max operating temperatures are 150 C and 125 C
> >respectively. We pulse the LED with 100 mA; 'course it is 0.1% duty cycle.
> >
>
> What are they detecting?  Level?  Purity?
> I've always felt conventional radiator sensors have a weakness here - lose
> your coolant (eg burst hose) and your enginge has to get *VERY* hot before
> this info is transmitted to the temp sender.

Ah - and then your temp sensor is high 'n dry and if you are lucky the air will
be hot enough to give an almost good reading....

--
Eric van Es               | Cape Town, South Africa
mailto:vanes@ilink.nis.za | http://www.nis.za/~vanes
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