Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1977-01-05
1981-02-24
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
With particular system function
340505, 340508, 340518, G08B 2900, G08B 2600
Patent
active
042530911
ABSTRACT:
Method and apparatus for a condition-sensing system including features of checking the integrity of the system and detecting the presence of an alarm condition. Condition-sensing system is described as a fire alarm system for a central station employing a modification of the McCulloh circuit. A plurality of fire detection loops including normally open circuit detectors are each powered at opposite ends. Each leg of each loop is sequentially checked for integrity and then the detectors are checked for alarm conditions. A switching system is employed for the sequential operations. A programmable controller is disclosed as a switching system.
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Caldwell Sr. John W.
Crosland Donnie L.
Huggett C. A.
Mobil Oil Corporation
Scherback William J.
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