Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1986-02-27
1987-05-12
Levy, Stewart J.
Communications: electrical
Condition responsive indicating system
Specific condition
73293, 250577, G01F 2328
Patent
active
046653910
ABSTRACT:
An empty container detector comprises a photoelectric transducer associated with the fluid container which generates a variable control signal to alternately indicate whether the light path of the photoelectric transducer is being refracted by a fluid. A second photoelectric transducer is associated with the fluid container above the fluid level in the container to establish a reference signal corresponding to the condition wherein the light path is not refracted or attenuated by the presence of a fluid. Electrical means are provided to connect the first photoelectric transducer to the second photoelectric transducer to linearize and normalize the reference signal with the control signal. A comparator is associated with the photoelectronic transducers and connected to an alarm which indicates when the control signal is substantially equivalent to the reference signal and thus indicating the lowering of the fluid level below the light path of the first photoelectric transducer.
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Spani, Wayne: "Circuit Optimizes Optical-Switch Biasing" EDN, Sep. 20, 1979.
Levy Stewart J.
Roskos Joseph W.
Warner-Lambert & Company
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