Isolator apparatus
AssigneeRosemount Inc.
InventorsRoger L. Frick, Dean S. Pierce
Life of this patent
Estimating the term…
Abstract
An isolator apparatus for coupling pressure from a pressurized fluid carried in a conduit to a pressure sensor in a pressure transmitter having an isolation diaphragm, isolation fluid, and a pressure sealing ring for providing an annular seal around an active region of the isolation diaphragm. The isolator apparatus includes a rigid support for spacing the pressure sealing ring away from the active region which reduces pressure measurement errors related to temperature-induced isolation fluid expansion, such that the annular seal overhangs the isolation diaphragm's active region.
Claims17
Apparatus for isolatingly coupling a pressure from a fluid in an input member to a pressure sensor providing an output as a function of the pressure, comprising:
- an inlet port disposed in the apparatus for receiving the fluid from the input member;
- isolation means disposed in the inlet port and having an active region bounded by an outer border for isolatingly coupling the pressure from the fluid to the pressure sensor;
- sealing means disposed in the inlet port around the isolation means for sealingly coupling the fluid from the input member to the isolation means;
- and
- support means disposed in the inlet port for supporting the sealing means to overlie at least a portion of the isolation means adjacent the outer border and spacing at least the portion of the sealing means away from the active region, such that an effective area of the active region is improved.
Apparatus for coupling a fluid under pressure carried through a pressure opening in an input member to a diaphragm of a pressure sensor comprising:
- a housing;
- a diaphragm supported on said housing, said diaphragm being sealed around a periphery, and having a central active region bounded by an outer border adjacent its periphery;
- a bounding seal supported on said housing and adapted to circumbsribe the pressure opening in the input member when the input member is coupled to the housing;
- support means supported on the housing adjacent the outer border of the diaphragm and extending inwardly toward the center of the diaphragm and having at least portions spaced from the diaphragm and overlying the active region bounded by the outer border to support the sealing means at portions that overlie the active region whereby fluid under pressure admitted by the pressure opening will act on an active area of the diaphragm that is greater than the area circumscribed by the bounding seal.
Apparatus for coupling a fluid under pressure from a fluid pressure opening in an input member to a pressure sensor providing an output as a function of the pressure, comprising:
- an inlet port formed in the apparatus for receiving the fluid from the pressure opening of the input member;
- isolation means disposed in the inlet port and having an actice region bounded by an outer border for isolatingly coupling the pressure from the fluid to the pressure sensor;
- sealing means disposed in the inlet port to bound the isolation means for sealingly coupling the fluid under pressure from the pressure opening in the input member to the isolation means;
- and
- support means mounted on the housing for supportingly spacing the sealing means away from the active region, such that an effective pressure receiving area of the active region is greater than the area bounded by the sealing means.
Dependencies are inferred from the claim text.