Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1990-08-28
1992-07-07
Cuchlinski, Jr., William A.
Communications: electrical
Condition responsive indicating system
Specific condition
367908, 181402, 73290V, G01F 2328
Patent
active
051286564
ABSTRACT:
A level detecting method and apparatus wherein a tubular member with one end open has a stationary wave generating means located within the tubular member. The stationary wave generating means generates stationary waves having a node or antinode at the open end, whereby a switching signal is provided when the open end of the tubular member is completely closed by a measuring object or when the measuring object approaches the open end. The apparatus comprises an oscillator, a tubular member with only one end open, stationary wave generating means for generating stationary waves of a specific frequency so as to have a node or antinode at the open end of the tubular member by receiving an oscillation output from the oscillator, the means being installed within the tubular member to divide it into an opening side and a closing side, and a switching circuit for providing a switching signal when the open end of the tubular member is completely closed by the measuring object or when the measuring object approaches the open end.
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Cuchlinski Jr. William A.
Gutierrez Diego F. F.
Kansai Automation Co., Ltd.
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