Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1977-08-25
1979-12-18
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
73293, G01N 2126
Patent
active
041796233
ABSTRACT:
A material or liquid level sensing system is disclosed having a first triggerable pulse generator connected to a level sensor which is in turn connected to a second triggerable pulse generator wherein the first triggerable pulse generator supplies a pulse to the level sensor which transmits the pulse to trigger the second pulse generator for supplying an output both to an output device and to the first triggerable pulse generator to trigger another pulse to the level sensor and so on. In this manner, the first pulse generator supplied a subsequent pulse to the level sensor depending on whether or not the second triggerable pulse generator has received the previous pulse from the first triggerable pulse generator. Thus, the system continuously supplies pulses to the level sensor as long as the second triggerable pulse generator continues to receive pulses, but these pulses are blocked when the material or liquid being sensed is at a predetermined level and the output means is appropriately activated.
REFERENCES:
patent: 2798213 (1957-07-01), Rowell
patent: 2798214 (1957-07-01), Rowell
patent: 3485262 (1969-12-01), Perren
patent: 3875403 (1975-04-01), Svensson
patent: 3882887 (1975-05-01), Rekai
patent: 3908129 (1975-09-01), Akers
patent: 4125779 (1978-11-01), Malinowski
Honeywell Ltd.
Joike Trevor B.
Nelms David C.
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