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I'm looking for a way to measure temperatures in range of 40 to -200 °C (100 to −320 °F). The usual solution DS18B20 works only down to -55 °C (-67 °F).

Any ideas?

p.s. Precision of 2 °C would be good enough.

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You probably want a K-type thermocouple (the most common type).

They have a range of around -200°C to +1350°C (depending on probe).

Alternatively a Resistive Temperature Device (RTD) can be used, since these have a typical range of around -240°C to 650°C with higher accuracy.

This might be of help to you: http://digital.ni.com/public.nsf/allkb/C50FA55B3B2F85D9862572D00083350E

  • I found on adafruits this board: Thermocouple Amplifier MAX31855 breakout board (adafruit.com/products/269) so for fast solution I'll try to built something around this board. In long term PT100 is a better solution. – Kris_R Jan 13 '16 at 20:31
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I did a search on "cryogenic temperature sensors" and found these from Lake Shore Cyrotronics – the price is shocking. It appears that you can use silicon diodes as cryogenic temperature sensors, so you might be able to use less expensive parts if you don't need a ton of accuracy.

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