Liquid level sensor with wide temperature range capacity

Details Liquid level sensor with wide temperature range capacity Liquid level sensor with wide temperature range capacity

1988-12-06

1990-10-09

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

73293, 356436, 356135, 250903, 250577, G08B 2100

Patent

active

049623958

ABSTRACT:
A liquid level sensor comprises a light source in the form of a semiconductor device, a light sensor also in the form of a semiconductor device, and an optical element arranged to transmit light from the light source and to receive reflected light and transmit it to the light sensor, the liquid level sensor further comprising a carrier having gas-filled cavities means in which the light source and the light source and the light sensor are respectively mounted, the cavities being separated by barrier means to prevent scattered light reaching the light sensor from the light source. The mounting of the light source and light sensor in gas-filled cavities extends significantly the operating temperature range of the liquid level sensor.

REFERENCES:
patent: 4132899 (1979-01-01), Shigemasa et al.
patent: 4246489 (1981-01-01), Yoshida et al.
patent: 4878383 (1989-11-01), Wiegand, Jr. et al.
patent: 4912319 (1990-03-01), Miyata et al.

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