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What can be used to measure liquid nitrogen temperature?

by Artlav
Tags: liquid, measure, nitrogen, temperature
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Artlav
#1
Jul14-14, 01:31 PM
P: 145
Hi.

I'm looking for a common electronic component that can be used to determine a temperature between room temperature and that of liquid nitrogen.

-Multimetre probe failed, getting stuck at -135*C
-Common NTC thermistors rapidly ascent past gigaohm range, even from 1Ω-5Ω initial values
-A ceramic capacitor looses a consistent amount of capacitance between here and there, but the capacitance keeps slowly trickling away at LN2 temperature (and i don't have a clue at what relationship is there between the C and T).
-A common resistor does not loose or gain any significant or consistent amount of resistance.
-A cr2032 battery ceases to work sharply

So, the question is - what is a practical way to measure such temperatures, without sourcing special probes and components?

The only thing that gives consistent data points on both ends is the ceramic capacitor - is it a valid temperature sensor? How exactly does it respond to temperature?
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UltrafastPED
#2
Jul14-14, 01:47 PM
Sci Advisor
Thanks
PF Gold
UltrafastPED's Avatar
P: 1,908
Have a look at http://digital.ni.com/public.nsf/all...2572D00083350E

Then pick the thermocouple or RTD that matches your requirement best.


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