Pressure responsive hopper level detector system

Details Pressure responsive hopper level detector system Pressure responsive hopper level detector system

1983-02-18

1985-07-09

Skaggs, H. Grant

Dispensing

Automatic control

Delivery from source controlled by quantity in discharging...

222 64, 73290R, B67D 508

Patent

active

045277141

ABSTRACT:
The level of such granular materials as fly ash and grain in a hopper presenting a differential internal hopper pressure above and below the level of materials in the hopper is sensed by sampling the pressure through a single flowless pressure conveying passageway extending by means of a port into the hopper interior. The pressure significantly changes above and below the level of materials. Thus, typically with a vacuum of about eight inches of water above the material level, the vacuum pressure is less than one-half an inch of water when the granular materials cover the port. Thus, a differential pressure gage connected between the atmosphere and the flowless pressure conveying passageway will indicate a significant difference in pressure when the level of materials covers the port. With a pressure gage operating relay contact an electric monitoring and control system may be used to automatically discharge the materials over long periods of time without maintenance.

REFERENCES:
patent: 417117 (1889-12-01), Thompson et al.
patent: 2640977 (1953-06-01), Parisi
patent: 2696114 (1954-12-01), Cummings
patent: 2696606 (1954-12-01), De La Potmelie
patent: 2756193 (1956-07-01), Bergstrom
patent: 2846879 (1958-08-01), Kauffman et al.
patent: 2883862 (1959-04-01), Huber
patent: 3300091 (1967-01-01), Wondrak et al.
patent: 4378897 (1983-04-01), Kattelmann

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