Liquid level detection circuit for control of liquid level respo

Details Liquid level detection circuit for control of liquid level respo Liquid level detection circuit for control of liquid level respo

1980-11-25

1982-07-06

Dixon, Harold A.

Electric lamp and discharge devices: systems

With automatic shunt and/or cutout

307308, 307252B, 315DIG4, 73304R, 340618, 367908, H05B 3700

Patent

active

043385460

ABSTRACT:
A liquid level presence detection circuit includes a selectively gatable TRIAC serially connected with a load and triggered into conduction by twin sensitive-gate SCR's connected anode-to-cathode with the gates of the SCR's connected to voltage divider circuits which provide gating current to the SCR's in response to the presence of a conductive liquid bridging the two spaced apart contacts of a liquid presence detecting probe. The circuit is used in wet-niche type lamp assemblies that provide underwater illumination in swimming pools and the like and in which cooling is effected by the surrounding liquid. The detection circuit advantageously interrupts the flow of electrical energy to the lamp when the level of surrounding liquid falls below a predetermined level to prevent over-temperature operation of the lamp and consequent damage thereto and resumes the flow of electrical energy to the lamp when the level of the surrounding liquid increases to a safe level to permit adequate cooling thereof.

REFERENCES:
patent: 3486042 (1969-12-01), Watrous
patent: 3619656 (1971-11-01), Domke
patent: 3700002 (1973-11-01), Brown
patent: 3732556 (1973-05-01), Caprillo
patent: 3746877 (1973-07-01), Lorenz
patent: 3914592 (1975-10-01), Maxey
patent: 3916213 (1976-10-01), Luteran
patent: 3994845 (1976-03-01), Luteran
patent: 4105367 (1978-08-01), Francis
patent: 4113312 (1978-09-01), McGalliard
patent: 4216411 (1980-08-01), Ehret et al.
patent: 4234819 (1980-11-01), Maxey

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