Material level monitor

Details Material level monitor Material level monitor

1986-12-01

1988-01-26

Yasich, Daniel M.

Chemistry: physical processes

Physical processes

Crystallization

73304R, 307310, G01F 2322

Patent

active

047209976

ABSTRACT:
The electronic monitor includes a level-sensing circuit, a reference circuit, a comparator circuit, and a logic circuit. The level sensing-circuit includes at least one level sensor positioned within the reservoir adjacent to and below a predetermined level. The reference circuit includes a reference sensor positioned in the air adjacent to the maximum allowed level for the material. A current source applies current to all the sensors. The comparator circuit compares the voltage across the reference sensor and the voltage across the level sensor and provides a difference voltage to a logic circuit that activates selective signaling devices depended upon the level of the monitored material. The sensors are preferably negative-coefficient thermistors.

REFERENCES:
patent: 3918035 (1975-11-01), Eshraghian
patent: 4307606 (1981-12-01), Johnson
patent: 4539547 (1985-09-01), Nagy et al.
patent: 4564834 (1986-01-01), Steele
patent: 4590797 (1986-05-01), Beaubatie et al.
patent: 4600844 (1986-07-01), Atkins
patent: 4628302 (1986-12-01), Barr et al.

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