Flame arrestor for process transmitter
First Claim
1. A process transmitter for sensing a process variable, the process transmitter comprising:
- a transmitter housing having an interior;
a sensor disposed within the interior for sensing a process variable of an industrial process and generating a sensor signal;
transmitter circuitry disposed within the interior and connected to the sensor;
a passageway in communication with the sensor and extending through the interior of the transmitter housing, the passageway having a first cross-sectional profile; and
a flame arrestor fabricated of bar stock and positioned in the passageway, the flame arrestor having a second cross-sectional profile different from the first cross-sectional profile;
wherein the second cross-sectional profile comprises a hexagonal shape; and
wherein the flame arrestor produces a path in an interior of the passageway having a smaller cross-sectional area than that of the first cross-sectional profile of the passageway.
1 Assignment
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Accused Products
Abstract
A process transmitter for sensing a process variable includes a transmitter housing, a sensor, transmitter circuitry, a passageway and a flame arrestor. The transmitter housing has an interior. The sensor is disposed within the interior, senses a process variable of an industrial process and generates a sensor signal. The transmitter circuitry is disposed within the interior and connects to the sensor. The passageway is in communication with the sensor and extends through the interior of the transmitter housing. The passageway has a first cross-sectional profile. The flame arrestor is positioned in the passageway. The flame arrestor has a second cross-sectional profile different from the first cross-sectional profile. The flame arrestor produces a path in an interior of the passageway having a smaller cross-sectional area than that of the first cross-sectional profile of the passageway.
28 Citations
20 Claims
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1. A process transmitter for sensing a process variable, the process transmitter comprising:
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a transmitter housing having an interior; a sensor disposed within the interior for sensing a process variable of an industrial process and generating a sensor signal; transmitter circuitry disposed within the interior and connected to the sensor; a passageway in communication with the sensor and extending through the interior of the transmitter housing, the passageway having a first cross-sectional profile; and a flame arrestor fabricated of bar stock and positioned in the passageway, the flame arrestor having a second cross-sectional profile different from the first cross-sectional profile; wherein the second cross-sectional profile comprises a hexagonal shape; and wherein the flame arrestor produces a path in an interior of the passageway having a smaller cross-sectional area than that of the first cross-sectional profile of the passageway. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A pressure transmitter for sensing a pressure of a process fluid, the pressure transmitter comprising:
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a sensor module comprising a sensor for sensing a process variable of an industrial process and generating a sensor signal; transmitter circuitry connected to the sensor for processing the sensor signal; a hydraulic relay system that provides a communication channel between the process fluid and the pressure sensor, the hydraulic relay system comprising; a passageway extending into the sensor module and having an interior wall; a polygonal flame arrestor positioned within the passageway and having an exterior wall that defines with the interior wall of the passageway a flow path space, the flame arrestor engaging the interior wall to define a varying gap distance between the interior wall and the exterior wall; wherein the exterior wall of the flame arrestor comprises; a plurality of polygonal faces spaced around the exterior wall and that extend along an entire length of the exterior wall; and a plurality of edges interposed between the plurality of polygonal faces and that extend along the entire length of the exterior wall; wherein the plurality of edges contact the interior wall such that the plurality of polygonal faces divide the passageway into a plurality of paths; a hydraulic fluid in the flow path space; and an isolation diaphragm positioned at one end of the passageway. - View Dependent Claims (12)
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13. A method of manufacturing a flame arrestor for use in a process transmitter, the method comprising:
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machining a through-hole in a slab shaped to be a transmitter component, the through hole having a circular cross-sectional profile; and inserting an elongate flame arrestor into the through-hole, the flame arrestor having a hexagonal cross-sectional profile that defines at least one path between the through-hole and the flame arrestor and that engages an interior surface of the through-hole so that the flame arrestor is held in place within the through-hole. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A process transmitter for sensing a process variable, the process transmitter comprising:
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a transmitter housing having an interior; a sensor disposed within the interior for sensing a process variable of an industrial process and generating a sensor signal; transmitter circuitry disposed within the interior and connected to the sensor; a passageway in communication with the sensor and extending through the interior of the transmitter housing from the sensor to an exterior of the transmitter housing to form a vent path, the passageway having a first cross-sectional profile; and a flame arrestor positioned in the passageway, the flame arrestor having a second cross-sectional profile different from the first cross-sectional profile; wherein the flame arrestor produces a path in an interior of the passageway having a smaller cross-sectional area than that of the first cross-sectional profile of the passageway.
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20. A process transmitter for sensing a process variable, the process transmitter comprising:
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a transmitter housing having an interior; a sensor disposed within the interior for sensing a process variable of an industrial process and generating a sensor signal; transmitter circuitry disposed within the interior and connected to the sensor; a passageway in communication with the sensor and extending through the interior of the transmitter housing, the passageway having a first cross-sectional profile; and a flame arrestor having a homogeneous cross-sectional profile and positioned in the passageway, the flame arrestor having a second cross-sectional profile different from the first cross-sectional profile; wherein the flame arrestor includes a plurality of longitudinal edges extending along a length of the flame arrestor that engage the passageway; and wherein the flame arrestor produces a path in an interior of the passageway having a smaller cross-sectional area than that of the first cross-sectional profile of the passageway.
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Specification