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Empty container detector

  • US 4,665,391 A
  • Filed: 02/27/1986
  • Issued: 05/12/1987
  • Est. Priority Date: 02/27/1986
  • Status: Expired due to Fees
First Claim
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1. A fluid level detector for use with a transparent fluid container which comprises;

  • a photoelectric transducer associated with said container having its light path aimed through said container for operating in a first state when said light path is refracted by a fluid in said container and operating in a second state when said light path is unrefracted by a fluid;

    means associated with said container to establish a normalized input to said photoelectric transducer corresponding to no fluid in said container; and

    an alarm associated with said transducer to indicate an empty container when said second state is a calibrated equivalent to a no fluid condition as established by said normalized input.

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