Fluid handling – Systems – Programmer or timer
Patent
1978-07-25
1980-11-11
Cohan, Alan
Fluid handling
Systems
Programmer or timer
239 70, 307 38, 307 41, 307132R, 307140, G05B 1101
Patent
active
042327075
ABSTRACT:
A controller which can be set to operate a group of sprinkler control valves, which can be easily set and tested for proper automatic operation, and which can operate a sprinkler system in a variety of ways. The controller includes a clock, a series of dividers for dividing down the frequency of the clock, and a group of controls that can be operated to begin sprinking cycles at predetermined times and close the sprinking control valves after predetermined durations. A selector control can be utilized to effectively increase the frequency of the clock, as by bypassing a divider stage, to operate the system at a very rapid rate, which is useful in testing the system for automatic operation after it is set and for repetitive short duration sprinkling cycles. The controller has a cascade input that enables the beginning of a cycle of operation by an external signal, to permit repeated cycling of the system, and to synchronize a group of controllers.
REFERENCES:
patent: 3989066 (1976-11-01), Sturman
patent: 3991375 (1976-11-01), Riggs
patent: 3991939 (1976-11-01), Maclay
patent: 4101786 (1978-07-01), Ruggles
Grill Benjamin
Sturman Oded E.
Cohan Alan
Hydronic Systems, Inc
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