Fluid control system and controller and moisture sensor therefor

Details Fluid control system and controller and moisture sensor therefor Fluid control system and controller and moisture sensor therefor

1976-03-01

1978-09-19

Cohan, Alan

Fluid handling

Systems

Programmer or timer

239 66, 239 70, 239 63, A01G 2516

Patent

active

041146476

ABSTRACT:
A fluid control system (and controller and moisture sensor therefor) having one or more latching solenoid operated pilot control valves and a master control unit for controlling the valves. The valves utilize a concentric arrangement of the major components thereof, each being coaxially located with respect to a single housing member. The control electronics may be battery operated and may locate with respect to one valve to provide drive signals to control one or more valves in sequence. The control electronics utilizes an oscillator such as a crystal oscillator with a chain of count down flip-flops to provide binary signals up to a period of preferably twenty-four hours or more. A manual selection is provided to select among the longer period signals to control the frequency with which the operating cycle is initiated, with a second manual control being used to select one of the lower frequency signals to control the duration for which each valve will remain open. Logic is provided so that only one valve will be open at any one time thereby providing for sequential rather than simultaneous operation of a group of valves during each watering cycle. Alternate embodiments utilizing light sensitive controls are also disclosed.

REFERENCES:
patent: 3106666 (1963-10-01), Kuchens
patent: 3270812 (1966-09-01), Gilchrist
patent: 3821967 (1974-07-01), Sturman

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