Material level sensor with removable optics

Details Material level sensor with removable optics Material level sensor with removable optics

1991-02-19

1992-11-17

Howell, Janice A.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

73293, G01F 2302

Patent

active

051646064

ABSTRACT:
A system for sensing the presence of or level of material within a vessel that includes a light transmitting probe extending into the vessel through a wall of the vessel from externally thereof. The probe has a lens with a closed end within the vessel for contact with the material sought to be detected, and a light source/sensor unit positioned externally of the vessel. The light source/sensor unit directs light energy through the lens of the probe to the closed end of the lens, which is within the vessel. The source/sensor unit detects the presence of material in contact with the closed end of the lens as a function of light energy reflected back to the source/sensor unit. The light source/sensor unit is removably mounted on the lens so that the source/sensor unit may be removed from the lens for service without removing the lens itself from the vessel wall.

REFERENCES:
patent: 3549893 (1970-12-01), Gibbs
patent: 3683196 (1972-08-01), Obenhaus
patent: 3766395 (1973-10-01), Kelr
patent: 3834235 (1974-09-01), Bouton et al.
patent: 4485856 (1984-12-01), Dulian et al.
patent: 4979797 (1990-12-01), Nemeth
patent: 5029471 (1991-07-01), Goodrich

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