Electronics > Beginners
Can a thermocouple give the temp of a metal surface?
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Peabody:
Or does the fact that it's touching metal mess up the reading?  So if I wanted to measure the temperature of a hotplate for reflow purposes, could I use a thermocouple?
ogden:

--- Quote from: Peabody on November 17, 2018, 03:01:22 am ---Or does the fact that it's touching metal mess up the reading?  So if I wanted to measure the temperature of a hotplate for reflow purposes, could I use a thermocouple?

--- End quote ---

Indeed. Just make good thermal, not galvanic connection.
Teledog:
Quick & dirty: ..I use a non-contact IR/laser thermometer
It's best if you paint the surface flat black first though (hi-temp/ BBQ paint)
Wan Huang Luo:

--- Quote from: Peabody on November 17, 2018, 03:01:22 am ---Or does the fact that it's touching metal mess up the reading?  So if I wanted to measure the temperature of a hotplate for reflow purposes, could I use a thermocouple?

--- End quote ---
yes a thermocouple shouldn’t get messed up by a reflow hot plate so you’re good to go
Peabody:
I had thought about using an IR thermometer, but my understanding is that it would need to be adjustable as to the emissivity of the surface, and one that would do that would be a lot more expensive than a thermocouple meter (such at the TM-902C).

So there appears to be a difference of opinion.  One says the contact has to be non-galvanic, but the other says it's ok.  Maybe the metal contact would be non-galvanic if no current actually flows.  Well I guess high-temp epoxy would make the question moot.
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