Pumps – With signal – indicator – or inspection means
Patent
1984-09-27
1986-02-11
Freeh, William L.
Pumps
With signal, indicator, or inspection means
417395, 92 5R, 92103F, 340605, F04B 2100, F04B 4306
Patent
active
045696349
ABSTRACT:
In accordance with the present invention, the imminent failure of a diaphragm due to the attack by a corrosive or a solvent or mechanical fatigue is predicted through the use of a diaphragm pump having a housing, a first chamber within the housing, a second chamber within the housing and a diaphragm mounted in the housing between the first chamber and the second chamber. The diaphragm is of a chemically inert, electrically non-conductive material which contains an interconnected, electrically conductive material extending within the diaphragm less than the full radial dimension of the diaphragm. The conductive material is approximately equally spaced from the two opposing surfaces of the diaphragm. The electrically conductive material is advantageously, an electrically conductive graphite and takes the form of a mesh, screen or web of conductive fibers, filaments or strands.
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patent: 3807906 (1974-04-01), Breit
Freeh William L.
Neils Paul F.
Parker Sheldon H.
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