Patent ID: 6356191
Filing Date: 2002-03-12
Classification: G01K,G08C

Abstract:
A process fluid temperature transmitter with improved error compensation, the transmitter comprising:a loop communicator couplable to a process control loop and adapted to communicate over the process control loop; a plurality of terminals couplable to a resistance temperature device to form a circuit including at least one non-associated voltage source having a non-associated voltage; a current source operably coupled to the plurality of terminals and adapted to pass a measurement current through the plurality of terminals; a voltage measurement device coupled to the plurality of terminals and disposed to provide a first voltage value indicative of a first voltage across the plurality of terminals including the non-associated voltage; and a controller coupled to the voltage measurement device and the loop communicator, the controller adapted to provide a process temperature value to the loop communicator for communication over the process control loop, the process temperature value related to the first voltage value and substantially independent of the non-associated voltage of the at least one non-associated voltage source.