Wire-sensored fire extinguisher with fault-monitoring control sy

Details Wire-sensored fire extinguisher with fault-monitoring control sy Wire-sensored fire extinguisher with fault-monitoring control sy

1992-02-04

1993-05-04

Stormer, Russell D.

Fire extinguishers

Special applications

Condition responsive control

169 65, A62C 3740

Patent

active

052072762

ABSTRACT:
A range hood positioned above a cooking range employs a continuous heat sensor system which includes twisted wires which are separated from one another by an insulator which is formed of a material which melts at a predetermined temperature. The wires carry a supervisory current which is monitored continuously. When the magnitude of the current is increased, such as by the creation of a short-circuit condition as would be caused by the presence of a fire, an actuation signal is issued to an actuator, which may include an explosive squib. The explosive squib releases a tension wire which holds a discharge valve in a closed position, permitting a fire suppressant fluid to be discharged from a supply tank. Monitor circuitry ensures that open-circuit or short-circuit faults do not disable the functioning of the actuation system. Multi-condition fault indicators alert the user visually and audibly of system faults.

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patent: 4854389 (1989-08-01), Warren et al.
patent: 4905765 (1990-03-01), Hein

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