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    • 1. 发明专利
    • LIQUID LEVEL SENSOR WITH PLUNGER
    • JPH0843175A
    • 1996-02-16
    • JP9908395
    • 1995-04-25
    • AUXITROL SA
    • ORIBUIE REGURA
    • G01F23/30G01F23/00
    • PURPOSE: To provide a level sensor with plunger excellent in reliability and sensitivity in which setting place is saved, and the whole operating element is contained in the plunger. CONSTITUTION: A level sensor is formed of a scale tape or scale cable 2 whose free end is fixed to a plunger 1 formed of a housing 100 and a probe 200 for detecting the presence of a liquid. The probe 200 is formed of a metallic waveguide formed of a cylindrical fixed type upper part 202, small sectional area parts 203, 204, 205 constituting a mechanical amplifier, a conical part 206, and a cylindrical lower end part 207 constituting the high sensitivity part of the probe 200. The metallic waveguide is connected to the housing 100 of the plunger 1 in the sealed state through a support flange 210. The support flange 210 is fixed to the conical part 206 of the metallic waveguide in the state where only the lower part of the fixed area of the metallic waveguide is protruded from the housing 100 so as to be capable of contacting a liquid. An oscillator 201 electrically energized by an electronic processing circuit 105 is installed to the free end of the upper part 202, and excited at a prescribed frequency fi for inducing an incident elastic wave within the waveguide.