Thermal measuring and testing – Temperature measurement – By electrical or magnetic heat sensor
Patent
1997-06-05
1999-03-02
Bennett, G. Bradley
Thermal measuring and testing
Temperature measurement
By electrical or magnetic heat sensor
324541, G01K 716
Patent
active
058761225
ABSTRACT:
A temperature transmitter in a process control loop comprises a temperature sensor and a transmitter circuit. The temperature sensor includes a sensor sheath and a sensor element positioned within the sensor sheath. At least one element lead is coupled to the sensor element and extends from the sensor sheath. A sheath lead is coupled to the sensor sheath and extends from the sensor sheath, wherein the element lead and the sheath lead provide signals to be measured. The transmitter circuit includes and A/D converter, a microprocessor and an input-output circuit. The A/D converter is coupled to receive the signals from the element lead and the sheath lead. The microprocessor is coupled to the A/D converter. The input-output circuit is coupled to the microprocessor for communication with the process control loop. The sheath lead allows the transmitter to monitor the sensor sheath's insulation resistance and generation of parasitic sheath-to-lead voltage.
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Bennett G. Bradley
Rosemount Inc.
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