Differential pressure device
First Claim
1. A pressure sensing apparatus having high overpressure protection means, said apparatus comprising:
- a housing having a first cell, a second cell, a sensing chamber, first pressure signal receiving means, and second pressure signal receiving means, each said first and second cell further comprising;
a cylinder having a first and second face;
a collapsible overpressure diaphragm mounted on said housing;
an isolation diaphragm mounted on said second face; and
channel means coupling said overpressure and isolation diaphragm and coupling one cell to said first pressure signal receiving means, said overpressure diaphragm being further positioned such that an overpressure protection cavity is formed between said overpressure diaphragm and said housing, a first cell cavity further coupled to said second pressure signal receiving means and a second cell cavity further coupled to said first pressure signal receiving means such that when a predetermined pressure is exceeded as applied against said isolation diaphragm and subsequently transmitted to said sensing chamber via said first pressure signal receiving means, said overpressure diaphragm responds non-linearly to said pressure yielding to relieve said first pressure signal receiving means of said pressure.
0 Assignments
0 Petitions
Accused Products
Abstract
A pressure sensing transmitter is provided that has high overpressure protection. The transmitter includes an housing having a first cell, a second cell, a sensing chamber, first and second pressure signal receiving means, and a differential sensor chip for measuring the pressure differential between the first and second pressure signal receiving means. Each cell further includes a cylinder with a clearance of an overpressure diaphragm mounted on the housing, an isolation diaphragm mounted on the other face, and a channel coupling the overpressure and isolation diaphragm and further coupling one cell to the first pressure signal receiving means and the other cell to the second pressure signal receiving means. Each overpressure diaphragm is positioned such that an overpressure protection cavity is formed between it and the housing. The first cell cavity is further coupled to the second pressure signal receiving means and the second cell cavity is further coupled to the first pressure signal receiving means. This arrangement allows a predetermined absolute pressure applied against one of the isolation diaphragms, subsequently transmitted to the sensing chamber via one of the pressure signal receiving means, to collapse an appropriate overpressure diaphragm to relieve one of the pressure signal receiving means of the excess pressure.
40 Citations
51 Claims
-
1. A pressure sensing apparatus having high overpressure protection means, said apparatus comprising:
-
a housing having a first cell, a second cell, a sensing chamber, first pressure signal receiving means, and second pressure signal receiving means, each said first and second cell further comprising; a cylinder having a first and second face; a collapsible overpressure diaphragm mounted on said housing; an isolation diaphragm mounted on said second face; and channel means coupling said overpressure and isolation diaphragm and coupling one cell to said first pressure signal receiving means, said overpressure diaphragm being further positioned such that an overpressure protection cavity is formed between said overpressure diaphragm and said housing, a first cell cavity further coupled to said second pressure signal receiving means and a second cell cavity further coupled to said first pressure signal receiving means such that when a predetermined pressure is exceeded as applied against said isolation diaphragm and subsequently transmitted to said sensing chamber via said first pressure signal receiving means, said overpressure diaphragm responds non-linearly to said pressure yielding to relieve said first pressure signal receiving means of said pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A pressure sensing apparatus having high overpressure protection, said apparatus comprising:
a housing having a first cell, a second cell, a sensing chamber, a first and a second pressure signal receiving means, and means for measuring a pressure differential between said first and said second pressure signal means in said sensing chamber, each said first and second cell further comprising; a cylinder having a first and second face; a collapsible overpressure diaphragm mounted on said housing; an isolation diaphragm mounted on said cylinder; a pressure cap mounted on said cylinder and proximate said isolation diaphragm such that a displacement cavity is formed to allow the displacement of said isolation diaphragm; channel means coupling said overpressure and isolation diaphragm and further coupling one cell to said first pressure signal means and the other cell to said second signal receiving means, said overpressure diaphragm being further positioned such that an overpressure protection cavity is formed between said overpressure diaphragm and said housing, a first cell cavity further coupled to said second pressure signal means and a second cell cavity further coupled to said first pressure signal means such that when a predetermined absolute pressure is exceeded as applied against said isolation diaphragm and subsequently transmitted to said sensing chamber via one of said pressure signal means, said overpressure diaphragm responds non-linearly to said pressure yielding to allow said isolation diaphragm to contact said cylinder such that said absolute pressure is borne by said cylinder and not said sensing chamber. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
-
23. A pressure sensing apparatus having high overpressure protection means, said apparatus comprising:
-
a housing having a first cell, a second cell, a sensing chamber, first and second pressure signal means, a differential pressure sensor in said sensing chamber along a boundary between said first and second pressure signal means, each said first and second cell further comprising; a cylinder having a first and second face; a collapsible overpressure diaphragm mounted on said housing; an isolation diaphragm mounted on said second face; and channel means coupling said overpressure and isolation diaphragm and further coupling one cell to said first pressure signal means and the other cell to said second pressure signal means, said overpressure diaphragm being further positioned such that an overpressure protection cavity is formed between said overpressure diaphragm and said housing, said first cell cavity further coupled to said second pressure signal means and a second cell cavity further coupled to said first pressure signal means such that when said predetermined absolute pressure is exceeded as applied against said isolation diaphragm and subsequently transmitted to said sensing chamber via one of said pressure signal means, said overpressure diaphragm responds non-linearly to said pressure yielding to allow said isolation diaphragm to contact said cylinder such that said absolute pressure is borne by said cylinder and not said sensing chamber. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31)
-
-
32. A pressure sensing apparatus comprising:
-
a housing having a sensing chamber; a plurality of cells within said housing; and a plurality of pressure signal receiving means within said housing, each of said cells transmitting a pressure to a corresponding pressure signal receiving means; wherein each of said cells further comprise; a cylinder having a first and second face; an isolation diaphragm mounted on said second face; a collapsible overpressure diaphragm having a spherical surface integral with a flat outer periphery mounted on said housing and opposite said first face, said overpressure diaphragm being positioned to form an overpressure protection cavity between said overpressure diaphragm and said housing; channel means for connecting said isolation and overpressure diaphragm to its pressure signal receiving means, and coupling said overpressure protection cavity to a pressure signal receiving means opposite of its pressure signal receiving means; and overpressure protection means for providing overpressure protection for its pressure signal receiving means wherein a predetermined pressure applied to said isolation diaphragm which is transmitted through said channel means causes said collapsible overpressure diaphragm to collapse non-linearly against said housing thereby relieving its pressure signal receiving means of said predetermined pressure. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41)
-
-
42. A differential pressure sensing apparatus comprising:
-
a housing having a first cell, a second cell, and a sensing chamber; a first pressure signal receiving means within said housing for receiving signals transmitted by said first cell; a second pressure signal receiving means within said housing for receiving signals transmitted by said second cell; and a differential pressure measuring means within said sensor chamber for measuring a pressure differential between said first and second pressure signal means; wherein each said first and second cell further comprise; a cylinder having a first and second face; a isolation diaphragm comprising a disk having an annulus ridge and deflection means, said isolation diaphragm being mounted on said second face; a collapsible overpressure diaphragm mounted on said housing and opposite said first face, said overpressure diaphragm being positioned to form an overpressure protection cavity between said overpressure diaphragm and said housing; channel means for connecting said isolation and overpressure diaphragm to its pressure signal receiving means, and coupling said overpressure protection cavity to the other pressure signal receiving means; and overpressure protection means for providing overpressure protection for its pressure signal receiving means wherein a predetermined pressure applied to said isolation diaphragm which is transmitted through said channel means causes said overpressure diaphragm to collapse non-linearly against said housing thereby relieving its pressure signal receiving means of said predetermined pressure. - View Dependent Claims (43, 44, 45, 46, 47, 48, 49, 50, 51)
-
Specification