Frequency sensitive level detecting apparatus

Details Frequency sensitive level detecting apparatus Frequency sensitive level detecting apparatus

1977-08-25

1979-01-09

Grimm, Siegfried H.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

73293, 137386, 340619, G01F 2300

Patent

active

041340221

ABSTRACT:
A level sensing apparatus is disclosed having a source for supplying a signal having a predetermined frequency, a level sensor connected to the source and having an output for supplying an output signal having the predetermined frequency as long as the material, the level of which is being sensed, is not at a predetermined level, a frequency sensitive circuit for receiving the output signal from the level sensor and for providing an output whenever the frequency of the signal is above or below the predetermined frequency, and a load which is connected to be responsive to the output from the frequency sensitive circuit.

REFERENCES:
patent: 2664556 (1953-12-01), Sontheimer
patent: 3384885 (1968-05-01), Forbush
patent: 3485262 (1969-12-01), Perren
patent: 3740563 (1973-06-01), Reichard
patent: 3882319 (1975-05-01), Clement et al.
patent: 3882887 (1975-05-01), Rekai
patent: 3908129 (1975-09-01), Akers
patent: 3908441 (1975-09-01), Virloget

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