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Originally Posted by Annirak
Thermocouples are analog devices. They don't have resolution. Do you mean the accuracy isn't there? If that's the case, then I'll agree with you.
The reason I said two thermocouples from the same batch is that they'll both be inaccurate. But the point is that they'll both be inaccurate by the same ammount. Or am I missing something here?
Are there other devices (I see you mentioning RTDs) that are very thin thermal sensors?
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I'll defer to Bill for the TC. (I'll try to dig up the reference).
Very thin, no, not many out there. I found an RTD element from Omega.com that's 10mm long, and 1mm in diameter, but it's a bare element (i.e. 2 wires). A bit pricey, but definitely available. The application is still a bit fuzzy to me (i.e. mounting of the element within a heat die). Not important though, there are many larger RTDs available for water in and water out.