Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1997-01-27
1998-09-08
Oen, William L.
Measuring and testing
Fluid pressure gauge
Diaphragm
73706, G01L 912
Patent
active
058047360
ABSTRACT:
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 selectably connecting at least one of the capacitors to an electronic circuit.
REFERENCES:
patent: 4187460 (1980-02-01), Dauge et al.
patent: 4257274 (1981-03-01), Shimada et al.
patent: 4289035 (1981-09-01), Lee
patent: 4422335 (1983-12-01), Ohnesorge et al.
patent: 4539850 (1985-09-01), Ziegler
patent: 4542435 (1985-09-01), Freud et al.
patent: 4565096 (1986-01-01), Knecht
patent: 4625560 (1986-12-01), Sanders
patent: 4644798 (1987-02-01), Tamura et al.
patent: 4730496 (1988-03-01), Knecht et al.
patent: 4735098 (1988-04-01), Kavli et al.
patent: 4794320 (1988-12-01), Chang
patent: 4852408 (1989-08-01), Sanders
patent: 4864463 (1989-09-01), Shkedi et al.
patent: 4944187 (1990-07-01), Frick et al.
patent: 5022270 (1991-06-01), Rud, Jr.
patent: 5311452 (1994-05-01), Yokota et al.
patent: 5377524 (1995-01-01), Wise et al.
patent: 5420578 (1995-05-01), O'Brien et al.
Klauder Philip R.
Moore James O.
O'Brien Christopher J.
Moore Products Co.
Oen William L.
LandOfFree
Differential capacitive transducer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Differential capacitive transducer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Differential capacitive transducer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1283445