Patent ID: 6473710
Filing Date: 2002-10-29
Classification: G08C

Abstract:
A two-wire temperature transmitter coupleable to a two-wire process control loop for measuring temperature of a process, comprising:at least one power supply configured to couple to the two-wire process control loop, the at least one power supply receiving power solely from the process control loop to power the two-wire temperature transmitter; a two-wire loop communicator configured to couple to the two-wire process control loop and at least send information on the loop; a temperature sensor comprising at least two temperature sensitive elements each having element outputs which elements degrade in accordance with different degradation characteristics; an analog to digital converter coupled to the element outputs and configured to provide digital output in response to an analog input; a microprocessor coupled to the digital output and configured to send temperature related information on the two-wire process control loop to the two-wire loop communicator, wherein the microprocessor calculates temperature related information as a function of at least one element output from a first temperature sensitive element and at least as a function of one degradation characteristic of at least a second temperature sensitive element.