METHOD FOR FIRE OR OVERHEAT DETECTION, AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2017 - IPC G08B17/06 

FIELD: fire safety.

SUBSTANCE: method for fire or overheating detection includes obtaining of temperature data from linear fire sensors. Fire or overheating signals are generated if linear fire sensors are operable and data of these linear fire sensors exceed the predetermined threshold values that indicate presence of fire or overheating. The set threshold values are corrected when the operating modes of the monitoring object are changed, including in the system with redundancy. After checking the linear fire sensors serviceability, the obtained temperature data for a predetermined time interval are stored, and the rate of temperature change is calculated from the stored temperature data array. The duration of a given time interval is determined based on the allowable time for fire detection. A fire or overheating detection device is used to implement the method. The device contains linear fire sensors consisting of working and mounting parts. The working part is made in the form of a long thin-walled flexible metal shell in which two sensors are placed, connected to the fire protection block, containing the main and reserve channels. Each channel includes a serially-connected analog-to-digital converter module, with input connected to linear fire sensors, a computer module with digital interfaces, one of which is used for communication with the backup channel, and the second is for communication with the monitored object, and a relay module. In each channel of the fire protection unit, an additional module is included to calculate the rate of temperature change and connected to the computer module. Sensitive elements are made of the same type and thermoresistive, each consisting of two parallel threadlike conductor strands parallel to the sheath, and connected to each other at one end of the sheath by welding and isolated from each other. A metal plug is hermetically welded to the sheath on the side of conductors connection.

EFFECT: increased accuracy of measurement of the average temperature and its increase rate in the monitored area, increased noise immunity and speed of fire or overheating detection device, its reduced weight and dimensions.

14 cl, 4 dwg