The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 19, 1998
Filed:
Oct. 25, 1996
Michael A Reed, Chelmsford, MA (US);
Paul Franzosa, Arlington, MA (US);
Arthur D. Little, Inc., Cambridge, MA (US);
Abstract
A sensing unit includes a re-usable portion which is isolated from system fluids and a disposable portion. The disposable portion includes an enclosure that defines an internal cavity with one wall of the enclosure being constituted by a flexible diaphragm that is exposed to operating pressure of the system. The re-usable portion has mounted therein a sensing array at a position adjacent to a non-system pressure side surface of the diaphragm. The sensing array includes a plurality of sensing elements which are arranged as radial inner and outer sets with each set being adapted to preferentially sense a deflection of a central portion of the diaphragm. An output signal representative of the fluid pressure in the fluid system is established based on a ratio of deflection signals from the sets of sensing elements. Preferably, the sensing elements constitute capacitive plates that have equally exposed surface areas.