Level indicator for a liquid in a container

Details Level indicator for a liquid in a container Level indicator for a liquid in a container

1985-10-11

1987-09-01

Laroche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

73293, G01N 2185, G01F 2300

Patent

active

046911138

ABSTRACT:
Liquid level indicator in a tank of the type having a total-reflection optical sensor (1). The sensor is mobile vertically, so as to be able to be immersed or partially immersed in relation to the liquid level. The optical sensor (1) has an integrated light transmitter (DE) and receiver (PR) and is suspended by a non-extensible cable (5) wound onto an upper drum (6), the drum being driven upwards or downwards by a stepping motor (9) relative to the liquid level. The sensor (1) is connected with a wire (10) through a pully (13) ballasted with a weight (14) and fastened at its upper end so as to provide both the mechanical tension of the cable (5) and the electrical connection of the mobile sensor (1). The indicator also comprises a magnetic sensor (16) co-operating with a magnet (17), one of these two units being fixed in the top position and the others being mobile with the cable (5), so as to detect the arrival of the sensor (1) at a given higher level or maximum liquid level.

REFERENCES:
patent: 4126040 (1978-11-01), Varacius et al.
patent: 4200982 (1980-05-01), Mueller et al.
patent: 4242590 (1980-12-01), von Tluck
patent: 4471656 (1984-09-01), Sanders et al.
patent: 4598742 (1986-07-01), Taylor

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