Measuring and testing – Fluid pressure gauge – Diaphragm
Reexamination Certificate
2006-11-07
2006-11-07
Williams, Hezron (Department: 2856)
Measuring and testing
Fluid pressure gauge
Diaphragm
C073S715000, C073S717000, C073S718000, C073S723000, C073S724000, C200S061040
Reexamination Certificate
active
07131335
ABSTRACT:
A pressure transmitter for transfer of a pressure prevailing in a first medium onto a second medium, including a pressure chamber4in a platform1, which chamber is separated from the first medium by means of a dividing membrane2, wherein the pressure can be transferred by means of the second medium to a pressure measurement cell. For timely recognition of an impending failure of the dividing membrane, an early warning detector is provided with a sensor chamber6having an opening, which faces the first medium; and a sensor7, which monitors a property of a medium container in the sensor chamber; and a barrier facing the first medium, pressure-tightly sealing the opening, and which, under contact with the first medium and equal conditions as experienced by the dividing membrane2, fails earlier than the dividing membrane, thus making possible a flow connection between the sensor chamber6and the first medium. Preferably, the barrier is in the form of a sacrificial membrane5, which is thinner than the dividing membrane. In this way, it is to be expected that, under corrosive destruction of the membranes, the sacrificial membrane5will be destroyed earlier than the dividing membrane2.
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Bacon & Thomas
Endress — Hauser GmbH + Co. KG
Rogers David A.
Williams Hezron
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