Dwyer Instruments, Inc.

Terrence J Troyer

James W Phillips

A pressure sensor having a radially tensioned diaphragm for measuring fluid pressure. The pressure sensor includes a first generally concave metal body member and a second generally concave metal body member, and a radially tensioned flexible metal diaphragm disposed therebetween that is tensioned by heating the sensor. The first and second body members are formed from a material having a coefficient of thermal expansion in the range of approximately 0.0000056 inch/inch/&#xb0; F. to 0.0000064 inch/inch/&#xb0; F. The diaphragm is formed from a precipitation hardening metal material having a coefficient of thermal expansion of approximately 0.0000060 inch/inch/&#xb0; F. The first body member and the second body member are formed from a ferromagnetic metal material such that the first and second body members shield the diaphragm from magnetic fields which may otherwise cause movement of the diaphragm.

Pressure sensor with a radially tensioned metal diaphragm

A pressure sensor having a radially tensioned diaphragm for measuring fluid pressure. The pressure sensor includes a first generally concave metal body member and a second generally concave metal body member, and a radially tensioned flexible metal diaphragm located therebetween that is tensioned by heating the sensor. The first and second body members are formed from a material having a coefficient of thermal expansion in the range of approximately 0.0000056 inch/inch/&deg; F. to 0.0000064 inch/inch/&deg; F. The diaphragm is formed from a precipitation hardening metal material having a coefficient of thermal expansion of approximately 0.0000060 inch/inch/&deg; F. The first body member and the second body member are formed from a ferromagnetic metal material such that the first and second body members shield the diaphragm from magnetic fields which may otherwise cause movement of the diaphragm.

A differential pressure gauge of the type comprising a controlling magnetic helix device carrying a pressure indicating arm, the position of which is controlled by a magnet mounted on the free end of a cantilevered leaf spring actuated by a pressure diaphragm exposed to differential pressures. While the helix is preferably of the monoflange or single lobe type, either single or double lobe forms may be employed and they cooperate with a parallelepiped shaped magnet having a planar pole face paralleling the axis of the helix and defining a magnetic axis that is normal to and intersects the helix axis. The magnet and helix are closely spaced, and the magnet is formed from a suitable high energy product type material. The gauge housing defines an integral one piece pressure wall that separates the helix from the magnet and defines within the gauge housing pressure cavity an operating space within which the magnet and its supporting leaf spring are mounted and operate. Between the helix and the magnet the pressure wall is of film dimensions and is contoured to stress in bending.

Growing community of inventors

LaPorte, IN, United States of America

Terrence J Troyer