Temperature sensor transmitter with sensor sheath lead
First Claim
1. A temperature transmitter in a process control comprising:
- a temperature sensor comprising;
a sensor sheath;
a sensor element positioned within the sensor sheath;
an element lead coupled to the sensor element and extending from the sensor sheath; and
a sheath lead coupled to the sensor sheath and extending from the sensor sheath, wherein the element lead and the sheath lead provide signals to be measured; and
a transmitter circuit comprising;
an A/D converter coupled to receive the signals from the element lead and the sheath lead;
a microprocessor coupled to the A/D converter; and
an input-output circuit coupled to the microprocessor for communication with the process control loop.
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Accused Products
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.
113 Citations
20 Claims
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1. A temperature transmitter in a process control comprising:
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a temperature sensor comprising; a sensor sheath; a sensor element positioned within the sensor sheath; an element lead coupled to the sensor element and extending from the sensor sheath; and a sheath lead coupled to the sensor sheath and extending from the sensor sheath, wherein the element lead and the sheath lead provide signals to be measured; and a transmitter circuit comprising; an A/D converter coupled to receive the signals from the element lead and the sheath lead; a microprocessor coupled to the A/D converter; and an input-output circuit coupled to the microprocessor for communication with the process control loop. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A temperature transmitter in a process control loop, comprising:
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a sensor housing; temperature sensing means positioned within the temperature sensor housing for sensing a temperature and providing a sensor output related to the sensed temperature; an element lead coupled to the sensor output and extending from the sensor housing; a sheath lead coupled to the sensor housing and extending from the sensor housing; A/D converter means coupled to the element lead and the sheath lead for converting analog signals received on the element lead and the sheath lead into digital signals; microprocessor means coupled to the A/D converter for controlling operation of the A/D converter; and input-output means coupled to the microprocessor for sending and receiving information over the process control loop. - View Dependent Claims (16, 17)
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18. A temperature transmitter in a process control loop, comprising:
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a temperature sensor comprising; a sensor sheath; a sensor element positioned within the sensor sheath for providing a temperature signal representative of a temperature of the sensor element; an element lead coupled to the sensor element and extending from the sensor sheath; and a sheath lead coupled to the sensor sheath and extending from the sensor sheath; and a transmitter circuit comprising; temperature measurement means coupled to the element lead for generating a temperature measurement as a function of the temperature signal; an input-output circuit coupled to the temperature measurement means for communication with the process control loop; and insulation resistance measurement means coupled to the sheath lead for generating an insulation resistance measurement as a function of a resistance between the element lead and the sheath lead. - View Dependent Claims (19, 20)
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Specification