> I was wondering if someone can point me to a cheap

source for engine compartment high heat switches or
buttons. I'd like to wire a high temp/fire alarm
circuit in my varieze to a simple LCD bulb or
horn+bulb. I've checked with 3 of the big button
makers and they only offer sensors up to about 350
degrees F. tops, and they don't like to sell direct.
I'd like to have 8 or more sensors in and around the
engine, fire wall and spar area that would close the
circuit at around 400, 450, 475 or even 500 F would
do.

This could also be one of the channels the EFIS scans.

Almost all the jet junkyards have piles of fire warning thermocouple
loops from old turbines. Beware-they break a lot, depending on type. But
worth a try. A seawind has the same problem.
[Marc Wiese]

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