A control device for evaporative roof cooling systems in which a lack of moisture on a sample surface actuates a valve to spray water onto a roof. The lack of moisture opens the circuit between two spaced electrodes located on the sample surface, causing a control relay to activate a water spray system by supplying a voltage to one or more solenoid water valves.
Dr. Stephens graduated from the University of California, San Diego School of Medicine in 1978. He works in Pleasant Hill, CA and specializes in Neurology. Dr. Stephens is affiliated with John Muir Medical Center Walnut Creek.