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Level indicator

  • US 4,987,776 A
  • Filed: 09/05/1989
  • Issued: 01/29/1991
  • Est. Priority Date: 03/16/1988
  • Status: Expired due to Fees
First Claim
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1. A sensing apparatus, comprising:

  • oscillator sensing means having an oscillator circuit means for outputting an oscillatory signal and a sensing element means associated therewith for radiating an electrostatic field therefrom during operation of said oscillator circuit means, said oscillator sensing means providing a sensing signal output having a voltage level which varies in proportion to changes in such electrostatic field caused by reactions thereof to the proximity of material or object to be sensed; and

    output circuit means, responsive to said sensing signal output from said oscillator sensing means, for outputting a voltage level indicative of the proximity of the sensed object or material to said sensing element means;

    whereinsaid oscillator sensing means further includes a connecting wire interconnecting said oscillator circuit means and said sensing element means, and wherein said connecting wire has a relatively smaller surface area than said sensing element means so as to minimize interference therewith.

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