K-Type Thermocouple Research

Q: What makes up a K-Type Thermocouple?
A: Al-Cr, Alumel and Chromel 1

Q: What is Alumel?
A: Alumel is an alloy of 95% nickel, 2% aluminum, 2% manganese, and 1% silicon

Q: What is the process of alloying Alumel?
A: Research ongoing

Q: What is Chromel?
A: Chromel is an alloy of 90% nickel, 10% chromium

Q: What is the process of alloying Chromel?
A: Research ongoing

Q: Which Chromel is typically used in K-Types? (A,C, or R?)
A: Research ongoing

Q: Which "leg" (negative/positive) is which?
A: The positive legs is Chromel and the negative leg is Alumel 2

Q: How are the two wires connected? (Soldered, welded, braised?)
A: Would seem to be welded. I'm thinking of trying to use a battery terminal spot welder

Tell me more about the different types of thermocouples

Thermocouple multiplexer shield for the Arduino:

Lots of kit from Tindie:

IP for Al-Cr:

Look-up Tables and Formulas:
Archive: https://web.archive.org/web/*/https://srdata.nist.gov/its90/download/download.html
Archive: https://web.archive.org/web/*/https://srdata.nist.gov/its90/download/type_k.tab

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