Sensors, methods and systems for determining physical...

Details Sensors, methods and systems for determining physical... Sensors, methods and systems for determining physical...

2007-11-29

2009-06-02

Allen, Andre J (Department: 2855)

Measuring and testing

Fluid pressure gauge

Diaphragm

Reexamination Certificate

active

07540197

ABSTRACT:
Sensors, methods and systems detect physical effects (e.g., corrosion, erosion, scaling and/or oxidation) of a fluid in contact with a diaphragm associated with a sensor assembly. The diaphragm preferably exhibits a first mechanical response when initially placed into contact with a fluid and a second mechanical response different from the first mechanical response after exposure to the fluid for a predetermined period of time. A change in the diaphragm mechanical responses between at least the first and second mechanical responses is therefore indicative of physical effects on the diaphragm over time caused by the fluid in contact therewith. A mechanical response sensor is operatively associated with the diaphragm so as to measure the change in the diaphragm mechanical responses and thereby determine the physical effects over time of the fluid in contact with the diaphragm. In some embodiments, the diaphragm is actuated due to a pressure condition exerted by the fluid or in other embodiments the diaphragm is internally actuated. Internal actuation includes pneumatic, hydraulic or piezoelectric means for producing a mechanical response of the diaphragm. In one embodiment, therefore, fluid corrosivity may be sensed by bringing a sensor assembly having a pressure-actuated diaphragm into contact with a corrosive fluid, exerting a pressure condition on the diaphragm so as to cause the mechanical response of the diaphragm, measuring the diaphragm deflection or strain, and then deriving fluid corrosivity from the measured diaphragm mechanical response.

REFERENCES:
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patent: 6671055 (2003-12-01), Wavering et al.
patent: 2007/0227252 (2007-10-01), Leitko et al.

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