Open sensor diagnostic system for temperature transmitter in a process control system
AssigneeRosemount Inc.
InventorWilliam R. Kirkpatrick
Life of this patent
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Abstract
A temperature transmitter in a process control system includes a temperature sensor which senses temperature and provides a sensor output related to sensed temperature. An analog-to-digital converter coupled to the sensor output provides a digitized output related to the sensor output. A microprocessor receives the digitized output, compensates the digitized output and provides a temperature output. Comparison circuitry compares the sensor output to a first threshold and provides an inhibit signal to the microprocessor if the sensor is outside of the first threshold.
Claims21
A temperature transmitter in a process control system, comprising:
- a temperature sensor sensing a temperature and providing a sensor output related to a sensed temperature;
- an A/D converter coupled to the sensor output providing a digitized output related to the sensor output;
- a microprocessor coupled to the digitized output which compensates and processes the digitized output and provides a temperature output;
- and
- comparison circuitry which compares the sensor output to a first threshold and provides an inhibit signal to the microprocessor if the sensor output is outside of the first threshold.
A method of measuring temperature of a process in a process control system, comprising the steps of:
- obtaining a sensor input related to temperature of the process;
- providing a digitized output related to the sensor output;
- compensating the digitized output and providing a compensated output indicative of temperature of the process;
- comparing the first sensor input with a threshold;
- and
- providing an error signal based upon the comparison.
Dependencies are inferred from the claim text.