US Patent No: 6,029,524

Number of patents in Portfolio can not be more than 2000

Transducer having redundant pressure sensors

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Abstract

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A pressure transducer having a redundant fluid pressure sensor can be used to determine if the pressure transducer needs to be recalibrated. The pressure transducer comprises a fluid pressure sensor for measuring differential pressure. The fluid pressure sensor includes a pair of substantially identical pressure sensors for providing a variable electrical output as a function of a differential fluid pressure and a reference sensor for providing an electrical output independent of the differential fluid pressure. A conditioning circuit is provided for generating a frequency-based signal whose frequency is a function of the electrical output for each fluid pressure sensor. The electrical output of the first and second pressure sensors can be compared to determine whether the pressure transducer needs to be calibrated. In one embodiment, the pressure sensors comprise variable capacitors. The first and second capacitors each have one fixed plate and one movable plate responsive to differential fluid pressure across the movable plate. The reference capacitor has two fixed plates. The first variable, second variable, and reference capacitors are all located in proximity to one another and in communication with the differential fluid pressure. The pressure transducer also includes a switching network connected to the capacitors for selectable connecting at least one of the capacitors to an electronic circuit.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
SIEMENS ENERGY & AUTOMATION, INC.ALPHARETTA, GA678
SIEMENS INDUSTRY, INC.ALPHARETTA, GA1290

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Klauder, Philip R Ambler, PA 4 52
Moore, James O Worcester, PA 7 124
O'Brien, Christopher J Libertyville, IL 25 154

Cited Art Landscape

Patent Info (Count) # Cites Year
 
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ACACIA PATENT ACQUISITION LLC (1)
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Allied Signal (1)
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MOORE PRODUCTS CO. (1)
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4,794,320 Multi-frequency capacitance sensor 7 1987
 
SIEMENS AKTIENGESELLSCHAFT (1)
4,539,850 Pressure or pressure-difference measuring apparatus with a pressure sensor device protected against overload 8 1983
 
SP-COMMERCIAL FLIGHT, INC., A DE CORP. (1)
4,479,070 Vibrating quartz diaphragm pressure sensor 42 1983
 
Testut-Aequitas (1)
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THE REGENTS OF THE UNIVERSITY OF MICHIGAN (1)
5,377,524 Self-testing capacitive pressure transducer and method 46 1992
 
THE SCOTT FETZER COMPANY (1)
4,852,408 Stop for integrated circuit diaphragm 21 1987
 
TOKYO ELECTRON LIMITED (1)
5,311,452 Plasma processing apparatus using capacitance manometer and pressure control method thereof 19 1991
 
YOKOGAWA ELECTRIC CORPORATION (1)
4,644,798 Capacitive type converter device 19 1985

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
MKS INSTRUMENTS, INC. (9)
6,993,973 Contaminant deposition control baffle for a capacitive pressure transducer 4 2003
7,201,057 High-temperature reduced size manometer 3 2004
7,141,447 Method of forming a seal between a housing and a diaphragm of a capacitance sensor 1 2004
7,137,301 Method and apparatus for forming a reference pressure within a chamber of a capacitance sensor 4 2004
7,284,439 Method for producing a pressure sensor for detecting small pressure differences and low pressures 4 2004
7,204,150 Turbo sump for use with capacitive pressure sensor 1 2005
7,389,697 Pressure sensor for detecting small pressure differences and low pressures 2 2005
7,624,643 Method and apparatus for forming a reference pressure within a chamber of a capacitance sensor 3 2006
7,316,163 Method of forming a seal between a housing and a diaphragm of a capacitance sensor 5 2006
 
VERIS INDUSTRIES, LLC (7)
7,352,287 Pneumatic controller 10 2006
8,692,540 Split core status indicator 0 2008
7,902,992 Status indicator 2 2008
7,855,655 Current switch with automatic calibration 3 2008
8,212,548 Branch meter with configurable sensor strip arrangement 2 2009
8,421,443 Branch current monitor with calibration 2 2009
8,421,639 Branch current monitor with an alarm 3 2009
 
APPSIDE CO., LTD. (1)
7,395,721 Force sensor, force detection system and force detection program 3 2004
 
CODMAN NEURO SCIENCES SARL (1)
8,631,708 Apparatus and method for minimizing drift of a piezo-resistive pressure sensor due to the progressive release of mechanical stress over time 0 2013
 
DENSO CORPORATION (1)
6,744,258 Capacitive sensor apparatus 24 2002
 
DEPUY SYNTHES PRODUCTS, LLC (1)
8,393,222 Apparatus and method for minimizing drift of a piezo-resistive pressure sensor due to progressive release of mechanical stress over time 1 2010
 
Emerson Process Management (1)
7,412,893 Redundant mechanical and electronic remote seal system 3 2006
 
MICRONAS GMBH (1)
6,425,289 Capacitive sensor 12 1999
 
The United States of America as represented by the Administrator of the National Aeronautics and Space Administration (1)
7,043,960 Self-calibrating pressure transducer 6 2004
 
YAMATAKE CORPORATION (1)
7,013,735 Pressure sensor 3 2002
 
YOKOGAWA ELECTRIC CORPORATION (1)
6,979,995 Frequency measuring circuit and resonant pressure sensor type differential pressure/pressure transmitter using the frequency measuring unit 3 2003
 
Other [Check patent profile for assignment information] (1)
6,550,338 Pressure sensing device 4 2000