Extruder pressure transmitter

Claim 2

In a pressure sensing device operated by fluid pressure from a source and including at least one active fluid pressure responsive means which responds to fluid pressure in a chamber as a function of the parameter to be sensed, the improvement comprising adjustment means for the active fluid pressure responsive means comprising flow restrictor orifice means having upstream and downstream restrictor orifice sections in a series fluid circuit defined in said device leading from the fluid pressure source to an area of different pressure level when the active responsive means is operating, means associated with at least one of said restrictor orifice sections to permit adjusting the size of said one restrictor orifice section, and means fluidly connecting said active fluid pressure responsive means with the series fluid circuit only in a location between said restrictor orifice sections.

Claim 3

The device of claim 1, wherein said active fluid pressure responsive means comprises a pressure responsive readout means sensing pressure in a chamber and said series fluid circuit leads from said chamber.

Claim 4

The device of claim 1 wherein said fluid pressure responsive means comprises a movable wall means actuated in response to differential fluid pressures thereon, and said series fluid circuit opens to said movable wall.

Claim 5

The device of claim 1 further including a sensing diaphragm for sensing pressures, a source of fluid under pressure, a control valve, a movable wall in a chamber movable in response to differential pressures thereon, a rebalance link between the control valve and movable wall, and passageway means whereby fluid under pressure controlled by said valve in response to movements of said first diaphragm communicates with a first side of said movable wall to cause a rebalance force on said valve through said link, said active pressure responsive means comprising a second opposite surface of said movable wall, said series fluid circuit leading from said fluid pressure source.

Claim 6

The device of claim 4 wherein said fluid pressure source is higher than atmospheric pressure, and the series circuit leads to atmosphere.

Claim 7

The device of claim 4 and a readout means, a readout fluid passageway leading from the chamber formed on the first side of said movable wall to an area of different pressure from said chamber, and a pair of readout flow restriction orifices in said readout passageway, at least one of said readout flow restriction orifices being adjustable, and said readout means comprising a second active fluid pressure responsive means and being open to said readout passageway between said readout flow restriction orifices.

Claim 8

The device of claim 5 wherein the orifice leading from the fluid pressure source to the second orifice includes adjustable means.

Claim 9

The device of claim 6 wherein the readout orifice closest to the chamber is adjustable and the second orifice in the readout passageway is fixed in size.

Claim 10

In a pressure sensor including a housing, means at a first end of said housing comprising a first diaphragm in position to be deflected due to pressure to be sensed, movable wall means in said housing at a point remote from said first diaphragm and forming first and second chambers in said housing, said movable wall means comprising a first fluid pressure responsive element, a source of fluid under pressure, a first passageway within said housing, said first passageway leading from said source of fluid under pressure to said first chamber, valve means in said first passageway, first means connected between said valve means and said first diaphragm whereby movement of said first diaphragm under sensed pressure changes the position of said valve means to change fluid flow through said first passageway, and second link means between said movable wall means and said valve means whereby a change in differential pressure in said chambers will rebalance said valve means and oppose the movement of said first diaphragm, pressure responsive readout means comprising a second fluid pressure responsive element, the improvement comprising means to adjust the response of one of said fluid pressure responsive elements including a second passageway leading from a fluid pressure area acting on said one fluid pressure responsive element to an area of different pressure from said fluid pressure area, flow restrictor orifice means having an upstream restriction and a downstream restriction in fluid series defined in said second passageway, said one fluid pressure element opening to said second passageway between said upstream and downstream restrictions, and means to adjust the effective amount of fluid flow restriction by at least one of said upstream and downstream restrictions.

Claim 11

In a pressure sensor including a housing, means at a first end of said housing comprising a first diaphragm in position to be deflected due to pressure to be sensed, movable wall means in said housing at a point remote from said first diaphragm and forming first and second chambers in said housing, said movable wall means comprising a first fluid pressure responsive element, a source of fluid under pressure, a first passageway within said housing, said first passageway leading from said source of fluid under pressure to said first chamber, valve means in said first passageway, first means connected between said valve means and said first diaphragm whereby movement of said first diaphragm under sensed pressure changes the position of said valve means to change fluid flow through said first passageway, and second link means between said movable wall means and said valve means whereby a change in differential pressure in said chambers will rebalance said valve means and oppose the movement of said first diaphragm, pressure responsive readout means comprising a second fluid pressure responsive element, the improvement comprising means to adjust the response of one of said fluid pressure responsive elements including a second passageway leading from a fluid pressure area acting on said one fluid pressure responsive element to an area of different pressure from said fluid pressure area, flow restrictor orifice means having an upstream restriction and a downstream restriction in fluid series defined in said second passageway, said one fluid pressure element opening to said second passageway between said upstream and downstream restrictions, and means to adjust the effective amount of fluid flow restriction by at least one of said upstream and downstream restrictions.

Claim 12

The sensor of claim 9 wherein said responsive element comprises a readout means, and said fluid pressure area comprises said first chamber open to said first passageway.

Claim 13

The sensor of claim 9 wherein said responsive element comprises said movable wall, and said fluid pressure area comprises said first passageway on a side of said valve opposite from said first chamber, said second chamber formed by said movable wall on a side thereof opposite from the first chamber being open to said second passageway between said orifice means.

Claim 14

The sensor of claim 9 wherein there are two fluid pressure responsive elements, and each of said responsive elements is open to separate second passageways, and each of said second passageways including at least one adjustable flow restriction orifice means in fluid series with another flow restriction orifice means.

Claim 15

In a pressure sensor including a housing, means at a first end of said housing comprising a first diaphragm in position to be deflected due to pressure to be sensed, movable wall means in said housing at a point remote from said first diaphragm and forming first and second chambers in said housing, a source of fluid under pressure, a first passageway within said housing, said first passageway leading from said source of fluid under pressure to said first chamber, valve means in said first passageway, first means connected between said valve means and said first diaphragm whereby movement of said first diaphragm under sensed pressure changes the position of said valve means to change fluid flow through said first passageway, and second link means between said movable wall means and said valve means whereby a change in differential pressure in said chambers will rebalance said valve means and oppose the movement of said first diaphragm, pressure responsive readout means associated with said first chamber, the improvement comprising means to adjust the pressure in said second chamber acting upon said movable wall means including a second passageway leading from said fluid pressure source to an area of lower pressure from said fluid pressure source, a pair of flow restrictor orifices in fluid series defined in said second passageway, at least one of said flow restrictor orifices being adjustable, and said second chamber opening to said second passageway between said orifices.

Claim 16

In a pressure sensor including a housing, means at a first end of said housing comprising a first diaphragm in position to be deflected due to pressure to be sensed, movable wall means in said housing at a point remote from said first diaphragm and forming first and second chambers in said housing, a source of fluid under pressure, a first passageway within said housing, said first passageway leading from said source of fluid under pressure to said first chamber, valve means in said first passageway, first means connected between said valve means and said first diaphragm whereby movement of said first diaphragm under sensed pressure changes the position of said valve means to change fluid flow through said first passageway, and second link means between said movable wall means and said valve means whereby a change in differential pressure in said chambers will rebalance said valve means and oppose the movement of said first diaphragm, pressure responsive readout means associated with said first chamber, the improvement comprising means to adjust the pressure in said second chamber acting upon said movable wall means including a second passageway leading from said fluid pressure source to an area of lower pressure from said fluid pressure source, a pair of flow restrictor orifices in fluid series defined in said second passageway, at least one of said flow restrictor orifices being adjustable, and said second chamber opening to said second passageway between said orifices.

Claim 17

The sensor of claim 13 and a third passageway leading from said first chamber to an area of different pressure than normal operating pressure in said first chamber, a pAir of flow restrictor readout orifices defined in said third passageway and being in fluid series, said readout means being open to said third passageway between said readout orifices, at least one of said readout orifices being adjustable.