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A sprinkler system timer is an electrical device that is used to set an irrigation sprinkler system to come on automatically at a certain time. Irrigation timers first appeared in the early 1960s to control large-radius lawn sprinklers, which at the time usually contained their own electrically operated valve (most golf-course sprinklers still use this type of actuation).
Most automatic irrigation valves are diaphragm valves in which the water above the diaphragm must be discharged for the valve to open. In a hydraulic system, the controller and valves are connected via small plastic tubes approximately 4 mm (¼ in) in diameter. The controller opens the tube connected to the valve, allowing that valve to open ...
Troubleshooting is a form of problem solving, often applied to repair failed products or processes on a machine or a system. It is a logical, systematic search for the source of a problem in order to solve it, and make the product or process operational again. Troubleshooting is needed to identify the symptoms.
A commercial sprinkler system is designed primarily for property protection. Residential sprinkler systems are designed to control a fire for a sufficient time to allow for the safe escape of the building occupants. While these systems will often also protect the structure from major fire damage, this is a secondary consideration.
Fault detection, isolation, and recovery (FDIR) is a subfield of control engineering which concerns itself with monitoring a system, identifying when a fault has occurred, and pinpointing the type of fault and its location. Two approaches can be distinguished: A direct pattern recognition of sensor readings that indicate a fault and an analysis ...
The 1987 James Hardie 1000 was an endurance race for Group A Touring Cars, staged on 4 October 1987 at the Mount Panorama Circuit, near Bathurst, in New South Wales, Australia. The race was the eighth round of the inaugural World Touring Car Championship , and was the 28th in a sequence of Bathurst 1000 races, commencing with the 1960 Armstrong ...
Frederick White Stokes, Deputy Assistant Controller, Post and Telecommunications Branch, British Element, Control Commission for Germany. Edmund Stone, Governor of the Royal Hospitals of Bridewell and Bethlem.
1979 – Hardie Gramatky, American author and illustrator (b. 1907) [265] 1980 – Alfred Hitchcock, English-American director and producer (b. 1899) [266]