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N-Type Thermocouple Sensor

Cai Biesinger
Prodigy 30 points

Hello everyone,

I've designed a circuit to read the temperature from an N-Type thermocouple using the WEBENCH Sensor Designer, but I can't seem to find out how to actually use it. Is there code or guidelines anywhere that will help me turn the values given by the circuit back into an actual temperature, or do I have to write this all from scratch?

Thanks,

Cai

  • 0
    TI__Intellectual 2360 points

    Hi Cai,

    The WEBENCH Thermocouple Sensor Designer is configured to give maximum ADC output for your requested maximum temperature, and minimum ADC output for your requested minimum temperature. (At the beginning of the design process, when you identified the thermocouple type, you also set the min, max, and reference temperatures.) If you are not using the ADC, then the circuit output is the signal that would have been presented to the "IN2" or input of the ADC. In the Operating Values, Performance panel of the design summary, see the parameter "ADC Applied Input Range." Again, the min. value is for your min. temperature and the max. value is for your max. temperature. If your measurement range is above about 100C, the slope of voltage to temperature is pretty linear, so you can interpolate an intermediate temperature.