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Thermocouples are best used for measuring temperatures that can go above 100°C. This is a bare-wire bead-probe which can measure air or surface temperatur...

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Thermocouples are best used for measuring temperatures that can go above 100°C. This is a bare-wire bead-probe which can measure air or surface temperatures. Most inexpensive thermocouples have a vinyl covering which can melt at around 200°C, this one uses a fiberglass braid so it can be used in high temperature measurements such as heaters and ovens. There's a small piece of heat shrink on the end to keep the fiberglass from fraying. If you're using at >250°C temperatures, simply remove it with a small blade.

  • K type thermocouple with glass over-braiding
  • Good up to 500°C (900 °F)!
  • Color-coded wires
  • 5 meters long 
  • Best used with a thermocouple amplifier such as the MAX31855, AD8495 or MAX31856

We have a handy tutorial which covers thermocouple use including both CircuitPython and Arduino libraries, and example code!

 

https://www.youtube.com/embed/Zzhqn1K7OwQ?start=505

Jargon buster

Plain-language definitions for the technical terms used above.

Thermocouple
A temperature sensor made from two different metals that produces a very small voltage depending on temperature. Because the signal is tiny, it usually needs careful amplification and accurate measurement hardware.
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