Process sensor module having a single ungrounded input/output conductor
First Claim
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1. A process sensor module, comprising:
- a housing including a first fitting adapted to rotatably mate with a second fitting on a bus adapter module;
integrated circuitry disposed in the housing, the integrated circuitry including a process sensor adapted to sense a process variable;
a two conductor circuit connected to the integrated circuitry, and adapted to energize the integrated circuitry;
communicate the sensed process variable to the bus adapter module; and
communicate data from the bus adapter module to the integrated circuitry; and
a rotatable coaxial electrical contact that is sealed in the first fitting and that is adapted to connect the two conductor circuit to the bus adapter module.
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Abstract
A process sensor module includes a housing with a first fitting that rotatably mates with a corresponding fitting on a bus adapter module. Integrated circuitry in the housing includes a process sensor. A two conductor circuit energizes the integrated circuitry, communicates a sensed process variable to the bus adapter module and communicates data from the bus adapter module to the integrated circuitry. A rotatable coaxial electrical contact is sealed in the first fitting and connects the two conductor circuit to the bus adapter module.
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Citations
17 Claims
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1. A process sensor module, comprising:
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a housing including a first fitting adapted to rotatably mate with a second fitting on a bus adapter module;
integrated circuitry disposed in the housing, the integrated circuitry including a process sensor adapted to sense a process variable;
a two conductor circuit connected to the integrated circuitry, and adapted to energize the integrated circuitry;
communicate the sensed process variable to the bus adapter module; and
communicate data from the bus adapter module to the integrated circuitry; and
a rotatable coaxial electrical contact that is sealed in the first fitting and that is adapted to connect the two conductor circuit to the bus adapter module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
the bus adapter module including a second coaxial electrical contact arrangement disposed in the second fitting and rotatably mating with the first coaxial electrical contact arrangement.
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5. The process transmitter of claim 4 wherein the first fitting includes first threads and the second fittings includes second threads that mate with the first threads.
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6. The process transmitter of claim 5 wherein the first and second coaxial electrical contacts are automatically mated when the first and second fittings are mated.
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7. The process transmitter of claim 6 wherein the first and second coaxial electrical contacts are mated over a rotation range of at least 720°
- degrees of rotation of the second fitting on the first fitting.
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8. The process transmitter of claim 6 wherein the first and second coaxial electrical contacts slidingly engage one another.
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9. The process transmitter of claim 6 wherein at least one of the first and second electrical contacts is spring loaded.
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10. The process transmitter of claim 4 wherein the housing is adapted for rigid mounting to a process vessel, and wherein rotating the second threaded fitting relative to the first threaded fitting rotationally varies a position of a conduit hub on the bus adapter module.
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11. The process transmitter of claim 4 wherein the bus adapter module includes:
a transformer having a first winding coupled to the two conductor circuit and a second winding coupled to a communication bus;
the transformer including a galvanic isolation barrier between first winding and the second winding.
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12. The process transmitter of claim 1 wherein the rotatable coaxial electrical contact arrangement includes a spring loaded pin.
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13. The process transmitter of claim 1 wherein the integrated circuitry comprises a delta sigma converter.
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14. The process transmitter of claim 1 wherein the process sensor is a pressure sensor.
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15. The process transmitter of claim 1 wherein the housing of the process sensor module is grounded.
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16. The process transmitter of claim 1 wherein the housing of the process sensor is electrically connected to one conductor of the two conductor circuit.
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17. The process transmitter of claim 16 wherein the housing of the process sensor is grounded.
Specification