Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1998-01-23
1999-11-02
Ballato, Josi
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324721, 340631, G01R 2702
Patent
active
059777826
ABSTRACT:
A sensor is provided with a conductive sensing element that has a composition adapted to provide a resistance large enough that predetermined magnitudes of voltage noise do not create a false indication of removal, e.g. by abrasion or corrosion. Also, the sensing element composition is adapted to provide a temperature coefficient of resistivity small enough that measurements are substantially independent of temperature. Resistance is preferably greater than 10 ohms and the absolute value of TCR is preferably less than 1000 parts per million per .degree. C. The conductive sensing element may be formed from several materials, including alloys of palladium or lead, particularly palladium-gold, lead-bismuth, or lead-palladium. A combination sensor is provided that includes an abrasion sensing element and a corrosion sensing element on the same substrate. A multi-purpose sensor with a single sensing element is provided by incorporating attributes of both an abrasion sensor and a corrosion sensor such that the multi-purpose sensor is susceptible both to abrasion and corrosion. A method is also provided for detecting when selected characteristics of a subject fluid, such as abrasiveness or corrosiveness, exceed a predetermined limit.
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Ballato Josi
CTS Corporation
Solis Jose M.
LandOfFree
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