Pressure transducer with media isolation

Details Pressure transducer with media isolation Pressure transducer with media isolation

1995-02-01

1997-07-01

Walberg, Teresa J.

Electrical resistors

Resistance value responsive to a condition

Fluid- or gas pressure-actuated

338 4, 338 42, 73746, G01L 122

Patent

active

056442858

ABSTRACT:
A pressure sensor die is provided with a flexible membrane and a plunger which combine to amplify a low pressure signal while also providing media isolation between a fluid being measured and the internal components of a pressure sensor. One embodiment of the pressure sensor disposes an end of the plunger in direct contact with a pressure sensor die while another embodiment disposes an elastomeric diaphragm between the plunger and the pressure sensor die. This second embodiment creates a chamber between the plunger and the pressure sensor die in which a fluid is captured by movement of the plunger. The captured fluid is decreased in volume by movement of the plunger and the resulting increase in pressure in transmitted to a pressure sensitive portion of a pressure sensor die. The device is particularly useful in conjunction with applications where media isolation is required between the fluid being measured and the components of the pressure sensor, such as kidney dialysis machines. It is also particularly useful where electrical isolation is required to prevent any possible shock hazard that could otherwise result from fluid communication between the fluid being measured and the electrically conductive portions of the pressure sensor. One embodiment of the pressure sensor comprises a means for preloading a pressure sensor die at atmospheric pressure in order to permit the device to measure both positive and negative pressures within the first chamber.

REFERENCES:
patent: 3167963 (1965-02-01), Boonshaft
patent: 3293916 (1966-12-01), Goff
patent: 3461416 (1969-08-01), Kaufman
patent: 3970982 (1976-07-01), Kurtz et al.
patent: 4034610 (1977-07-01), Biddle et al.
patent: 4449113 (1984-05-01), Gould et al.
patent: 4512199 (1985-04-01), Woodward et al.
patent: 4545389 (1985-10-01), Schaberg et al.
patent: 4602513 (1986-07-01), Hirota et al.
patent: 4653329 (1987-03-01), Sagara et al.
patent: 4656454 (1987-04-01), Rosenberger
patent: 4683894 (1987-08-01), Kodama et al.
patent: 5156052 (1992-10-01), Johnson et al.
patent: 5184107 (1993-02-01), Maurer
patent: 5327785 (1994-07-01), Maurer
patent: 5351550 (1994-10-01), Maurer
patent: 5353003 (1994-10-01), Maurer
patent: 5483994 (1996-01-01), Maurer

Affiliated with

Also associated with

Rating

Pressure transducer with media isolation does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Pressure transducer with media isolation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pressure transducer with media isolation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-600717