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A process variable transmitter for measuring a temperature in an industrial process includes an infrared detector arranged to receive infrared radiation from a component in the industrial process. A memory contains temperature characterization information which relates the infrared radiation receive

A process variable transmitter for measuring a temperature in an industrial process includes an infrared detector arranged to receive infrared radiation from a component in the industrial process. A memory contains temperature characterization information which relates the infrared radiation received from the component with an internal temperature of the component. Measurement circuitry is configured to determine the internal temperature of the component based upon the received infrared radiation from the component and the temperature characterization information.

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1. A process variable transmitter for measuring a process temperature in an industrial process, comprising: an infrared detector arranged to receive infrared radiation from a process component in the industrial process;a memory containing temperature characterization information which relates the in

1. A process variable transmitter for measuring a process temperature in an industrial process, comprising: an infrared detector arranged to receive infrared radiation from a process component in the industrial process;a memory containing temperature characterization information which relates the infrared radiation received from the process component with an internal temperature of the process component;a temperature sensor located internal to the process component;measurement circuitry configured to infer the internal temperature of the process component based upon the received infrared radiation from the surface of the process component and the temperature characterization information; andwherein the measurement circuitry operates in a characterization phase to generate the characterization information based upon a relationship between a temperature sensed by the temperature sensor and radiation received by the infrared detector. 2. The process variable transmitter of claim 1, wherein the characterization information comprises polynomial coefficients. 3. The process variable transmitter of claim 1, wherein the characterization phase is entered during startup of the industrial process. 4. The process variable transmitter of claim 1, wherein the measurement circuitry operates in the characterization phase until the temperature sensor fails. 5. The process variable transmitter of claim 1, wherein the measurement circuitry enters the characterization phase in response to a command. 6. The process variable transmitter of claim 1, wherein the process component comprises a process vessel which contains process fluid. 7. The process variable transmitter of claim 1, wherein the characterization information is further a function of a trend in the received infrared radiation. 8. The process variable transmitter of claim 1, wherein the characterization information is stored in the memory during manufacture of the process variable transmitter. 9. The process variable transmitter of claim 1, wherein the characterization information is selectable by an operator. 10. The process variable transmitter of claim 1, including output circuitry configured to provide a determined temperature output on a process control loop. 11. The process variable transmitter of claim 1, wherein the internal temperature of the process component comprises temperature of a process fluid contained within the process component. 12. The process variable transmitter of claim 1, including an ambient temperature sensor and wherein the determined internal temperature is further a function of the ambient temperature. 13. The process variable transmitter of claim 12, wherein the characterization information includes characterization information related to the ambient temperature. 14. A method for measuring a temperature of a process fluid in an industrial process, comprising: receiving infrared radiation with an infrared radiation detector from a process component in the industrial process which carries the process fluid;placing a temperature sensor internal to the process component and in contact with the process fluid;determining temperature characterization information based upon a temperature sensed by the temperature from the temperature sensor and radiation received by the infrared radiation detector;retrieving the temperature characterization information from a memory, wherein the temperature characterization information relates the received infrared radiation to temperature of the process fluid;applying the temperature characterization information to the received infrared radiation and responsively inferring temperature of the process fluid; andproviding an output related to the temperature of the process fluid. 15. The method of claim 14, including sensing an ambient temperature of the industrial process and wherein the temperature characterization information includes ambient temperature characterization information.