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10k Thermistor with CR1000X

MattB Jul 21, 2020 11:18 PM

Hi all,

I have a 10k thermistor I would like to measure with a CR1000X.

The sensor is a Second Wind SWI 10k thermistor.

Can I simply use the "Therm109" instruction for this?

If not, advice on the best instruction and method would be greatly appreciated.

Thanks very much,


JDavis Jul 22, 2020 09:17 AM

You need a fixed value resistor to complete the half bridge circuit. Check the documentation for the sensor to see if it has one internally. If the sensor is just a 2 wire probe (plus shield wire), it does not have a fixed value resistor in it.

The recommended fixed value resistor is a 3WHB10K. You need to wire the sensor in a manner to get this circuit. On a 3WHB10K, you would connect the short wire to a Vx channel, and connect the two wires of the probe into H and ground of the module. The L on the module would not be connected.


The instruction to use is BrHalf. You then have to calculate the resistance. The formula to get resistance is shown in the help for the instruction.


To go from resistance of the termistor to temperature, you need the formula specific to that sensor. Look in the manual for coefficients to use in the Steinhart-Hart equation.

MattB Jul 22, 2020 04:25 PM

Hi JDavis,

Thank you very much for your prompt and detailed response - most appreciated.



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