A transmitter in a process control system includes a resistance-based sensor sensing a process variable and providing a sensor output. Self heating circuitry coupled to the sensor provides a self heating signal related to the sensor. Analog-to-digital conversion circuitry coupled to the sensor output...http://www.google.com/patents/US6519546?utm_source=gb-gplus-sharePatent US6519546 - Auto correcting temperature transmitter with resistance based sensor
