Testing thermo sender?

[2bang]

Hello...

Just sent a spare head off for the usual work... I pulled the sender so as to send a bare head
and clean up the sender a bit.
First thought I'd just pop for a new one, but after seeing the prices
(and not even OEM)... I figured better to cleanup/test/use the one I removed...

Since I've no idea how it works.. I have no idea how to test it.
All this also made me think.... how would one know if an orignal/brand new one was anywhere
near accurate?!

Any Ideas on how?
Thanks in advance...

[waltmil]

I don't have the specs or a diagram in front of me but it is probably a thermocouple and varies resistance with temperature change. Put ohmmeter leads across it and see if it changes with temperature, heat gun, sunlight, soldering iron. There are probably specs in the manual.

[3264tony]

I tested a spare one from an LC2 a little while ago and you basically connect a multimeter set to ohms with one lead on the tab where the single wire fits on and the other lead goes round the round part below the threaded section that goes into the coolant. If you put it in hot water the resistance should increase as the water cools. The manual says with the water temperature at 100 degrees C you should get 27.4ohms, at 80 degrees C 52.1ohms, at 60 degrees C 104 ohms and at 40 degrees C 240 ohms.

Tony

[2bang]

Well that answers that! Thanks so much gents!!!!

Ah, so thats what a thermocouple is/how it works...
Good to know the exact values Tony..
Where is Quincy Walt?

Now, if only I can find my multimeter....

Greg

[waltmil]

Quincy is about 20 miles northwest of Tallahassee.