Measuring and testing – Fluid pressure gauge – Diaphragm
Reexamination Certificate
2007-10-23
2007-10-23
Allen, Andre J. (Department: 2855)
Measuring and testing
Fluid pressure gauge
Diaphragm
C073S736000
Reexamination Certificate
active
11103439
ABSTRACT:
The invention relates to a device and a method for the status monitoring of a pressure measuring unit in an absolute or differential or relative pressure transducer, a pressure-sensitive element installed in the pressure measuring unit being impinged with at least one pressure generated by at least one membrane. During a defined diagnosis time interval, a testing element integrated in the pressure measuring unit is induced to undergo a change in volume, preferably by electrical activation. The pressure difference caused as a result in the pressure measuring unit is registered by a pressure-sensitive element. The curve registered during a diagnosis time interval is compared with a reference curve recorded with the pressure measuring unit intact. A fault indication is given if the deviations between the registered curve and the reference curve exceed predetermined tolerance values.
REFERENCES:
patent: 3995493 (1976-12-01), Nishihara
patent: 4787249 (1988-11-01), Duppui et al.
patent: 5396802 (1995-03-01), Moss
patent: 34 04 634 (1985-08-01), None
patent: 199 31 227 (2001-01-01), None
Altiok Emrullah
Bianchi Corrado
Biskup Jürgen
Daake Wilhelm
Gasch Armin
ABB Research Ltd
Allen Andre J.
Buchanan & Ingersoll & Rooney PC
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