Fire monitoring system
AssigneeNittan Company, Limited
InventorTetsuo Kimura
Life of this patent
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Abstract
A fire monitoring system used in a fire alarm arrangement includes a fire receiver and a plurality of fire sensors connected to signal/power supply zone lines from the fire receiver to a plurality of fire warning zones, the sensors for short-circuiting the respective zone lines with a low impedance in case of a fire. An analog detector having an address is located at a given warning zone among the fire warning zones. The analog detector is connected to the corresponding signal/power supply zone line through an analog sensor controller having an operation circuit for calculating an analog signal obtained by address polling from the analog detector.
Claims4
A fire monitoring system for monitoring a plurality of fire warning zones, said system comprising:
- a receiver having a plurality of signal/power supply zone lines connected thereto, each zone line leading to a different one of said plurality of fire warning zones;
- a plurality of sensors, each sensor being capable of detecting an environmental abnormality characteristic of the presence of fire, each sensor connected to said receiver by a respective signal/power supply zone line and being respectively disposed in one of said fire warning zones, and each sensor including means for short-circuiting a zone line connected thereto with a low impedance in the event said environmental abnormality is sensed;
- at least one analog sensor having an address and disposed at one of said warning zones and connected to one of said signal/power supply zone lines;
- and
- an analog sensor controller connected to said signal/power supply zone line of said at least one analog sensor, said analog sensor controller including means for polling the address of said at least one analog sensor and for calculating an analog signal from said analog sensor.
Dependencies are inferred from the claim text.