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US 4,051,467 AGranted
Fluid flow detector for a fire alarm system
AssigneeAmerican District Telegraph Company
InventorAaron A. Galvin
Life of this patent
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AssigneeAmerican District Telegraph Company
InventorAaron A. Galvin
Estimating the term…
A sprinkler flow detector which can detect and rapidly respond to the onset of water flow in a sprinkler system which results, for example, from the release of one or more sprinklers. The detector senses the pressure vs. time profile of the system or house side of the sprinkler system. An increase in pressure is accurately tracked without causing alarm. If, however, the pressure falls in excess of certain predetermined rates and amounts, and holds in the lower state for in excess of a second certain predetermined amount of time, the detector enters an alarm state. In a preferred embodiment the detector features a trouble state in which it responds to one of several monitored conditions, for example, a component failure in the detector electrical circuitry, excessive pressure in the sprinkler system, or dangerously low pressure in the sprinkler system.
A sprinkler flow detector for providing an alarm signal when a predetermined condition of fluid flow exists in a sprinkler system which includes a system side containing a fluid under pressure, said system side having at least one outlet port for allowing fluid to escape from the system side and at least one inlet port for admitting fluid into the system side, said detector comprising:
In a sprinkler system containing fluid under pressure and including at least one inlet port for admitting fluid into the system and at least one outlet port for allowing fluid to escape from the system, a flow detector for providing an alarm signal in response to the escape of fluid from one or more of the outlet ports comprising:
Dependencies are inferred from the claim text.