Measuring and testing – Fluid pressure gauge – Diaphragm
Reexamination Certificate
2005-03-22
2005-03-22
Garber, Charles D. (Department: 2856)
Measuring and testing
Fluid pressure gauge
Diaphragm
C073S049700
Reexamination Certificate
active
06868732
ABSTRACT:
A device and method for signaling differential pressure change occurring during leak testing of an evaporative emission control space in a motor vehicle fuel system. A casing has sensing ports one of which is communicated to a reference pressure, such as atmospheric pressure, and another of which is communicated to sense pressure in the evaporative emission control space. As difference between the reference pressure and the pressure in the control space changes, the net magnetic flux acting on a magnetoresistive sensor changes. The sensor is electrically connected to the vehicle electrical system for signaling the differential pressure. The device may be used for both positive and negative pressure leak testing.
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Garber Charles D.
Siemens VDO Automotive Inc.
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