Process variable transmitter with cryogenic temperature sensor

A process variable transmitter for sensing a cryogenic temperature in an industrial process, comprising:

• a cryogenic temperature sensor configured to be thermally coupled to an industrial process, the cryogenic temperature sensor having an electrical resistance which changes in response to changes in a cryogenic temperature, wherein the industrial process is at the cryogenic temperature;
• resistance measurement circuitry electrically coupled to the cryogenic temperature sensor, the resistance measurement circuitry configured to measure a sensor resistance over a sensor resistance range and responsively provide an output related to temperature based upon the measured resistance;
• and
• transmitter output circuitry coupled to the measurement circuitry configured to transmit information related to the cryogenic temperature to a remote location;
• wherein the cryogenic temperature sensor comprises a polycrystalline silicon sensor including a dopant such that the cryogenic temperature sensor has an electrical resistance which changes over a cryogenic temperature range which is within the sensor resistance range of the measurement circuitry.