Instrument for sensing level of granular materials

Details Instrument for sensing level of granular materials Instrument for sensing level of granular materials

1975-01-24

1976-04-13

Smith, Jr., David

Electrical transmission or interconnection systems

Switching systems

Condition responsive

73304C, 317249R, H01H 3500

Patent

active

039506533

ABSTRACT:
A cylindrical housing contains both a circuit board and a pair of capacitive sensing electrodes. The pair of electrodes are adjacent the inside wall near an end that is to be wholly or partly covered with granular material in a container. Since an electric field is relatively concentrated about the electrodes, compared with the divergent field about the type having a single protruding electrode and depending on external ground planes, the circuits of the instrument show presence of material repeatedly quite close to a predetermined level. The unitary construction affords protection and permits the capacitive sensing electrodes to be mounted on the circuit board over a printed circuit tab.

REFERENCES:
patent: 2541897 (1951-02-01), Wadsworth
patent: 3062994 (1962-11-01), Mesh
patent: 3638491 (1972-02-01), Hart

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