I'd like to measure the surface temperature of of a metal surface, to see how much that metal surface is heating up. I'm trying to recreate The EngineGuard.
The EngineGuard uses a 10mm washer, that is somehow capable of reading temperature. I've done a bit of reading, and there are things like the LM35, but they seem to measure ambient temperature. Could you attach an LM35 to a metal washer somehow to measure the temperature of the metal washer? Is it as simple as putting some thermal paste between the washer and the LM35? If I used thermal paste to mount an LM35, how would I know which "side" if the LM35 is doing the measurement?
I've seen these washer type devices referred to as "Ring lug thermistor" so maybe the question is, "How do I make a ring lug thermistor"?
If we abstract the problem a little bit, is there a way to mount a temperature sensor to a surface to measure the temperature of that surface?
In the use case I am looking at, we only care if the temperature changes more than 5°C, so super high resolution is not that important. The temperature range is 20°C to 130°C. The ambient temperature will be 10 - 30°C, so hopefully insulation from the ambient temperature could be controlled by some shrink wrap?
I mention the LM35 because it seems popular, but if a thermocouple or other thermistor is more appropriate, please let me know.