Field device including a capillary tube having a non-cylindrical lumen
AssigneeRosemount Inc.
InventorGeorge Hausler
Life of this patent
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Abstract
In a particular embodiment, a field device is disclosed that includes a housing defining a fluid cavity and a sensor cavity and having an isolation barrier to isolate the fluid cavity from the sensor cavity. The field device further includes a pressure sensor disposed within the sensor cavity. The pressure sensor includes at least one pressure inlet. The field device also includes a capillary tube extending from the at least one pressure inlet to the fluid cavity through the isolation barrier. The capillary tube includes a lumen having a non-cylindrical shape.
Claims20
A field device comprising:
- a housing defining a fluid cavity and a sensor cavity, the housing including an isolation barrier to isolate the fluid cavity from the sensor cavity;
- a pressure sensor disposed within the sensor cavity, the pressure sensor including at least one pressure inlet;
- and
- a capillary tube extending from the at least one pressure inlet to the fluid cavity through the isolation barrier, the capillary tube including a lumen having a non-cylindrical shape.
A method comprising:
- forming a housing base adapted to couple to process equipment, the housing base including a sensor cavity and a fluid cavity separated by an isolation barrier and including a capillary tube, the capillary tube including a lumen having a non-cylindrical shape, the capillary tube extending from the fluid cavity to the sensor cavity through the isolation barrier;
- attaching a deformable diaphragm to the housing base over the fluid cavity;
- filling the fluid cavity with a fill fluid;
- and
- coupling a sensor circuit to the capillary tube within the sensor cavity, the sensor circuit adapted to detect a process fluid pressure based on a deformation of the deformable diaphragm via the fill fluid.
A field device to monitor a process fluid pressure, the field device comprising:
- a transmitter housing defining a sensor cavity and a fluid cavity separated from the sensor cavity by an isolation barrier;
- a capillary tube including a lumen having a non-cylindrical shape, the capillary tube extending from the fluid cavity to the sensor cavity through the isolation barrier and adapted to prevent a flame from traversing a length of the capillary tube;
- a deformable diaphragm coupled to the transmitter housing over the fluid cavity;
- a fill fluid disposed within the fluid cavity and the capillary tube;
- and
- a sensor circuit disposed within the sensor cavity, the sensor circuit coupled to the capillary tube to sense a process fluid pressure via the fill fluid based on deformation of the deformable diaphragm.
Dependencies are inferred from the claim text.