FIELD: fire safety.
SUBSTANCE: method of detecting a fire or overheating, which consists in measuring the temperature and rate of its change by the resistance of one or more sensitive elements of a linear thermistor sensor. Controlling the health of these sensitive elements, generate and transmit information about a fire, overheating or detected faults. In addition, the integrity of the liner of a linear thermistor sensor is also controlled by the insulation resistance of the sensing elements. The fire detection or overheating detection device includes a fire detection unit, on the input of which linear thermistor sensors are connected. In the fire detection unit, the resistance of the sensing elements of linear thermoresistive sensors is measured, the resistance of the temperature and its rate of change is calculated, the health of the sensing elements and the integrity of the shell of the linear thermoresistive sensors are checked for the insulation resistance of the sensing elements. In addition, in the fire detection unit, information on fire, overheating or malfunctions are generated and transmitted to the fire protection system of the monitoring facility. Each linear thermoresistive sensor is a long thin-walled metal shell in which one or more sensing elements are made of metal with a positive temperature coefficient of resistance and isolated from each other and from the shell by a heat-conducting material. Inside the shell, one or more insulated conductors are also placed, relative to which the insulation resistance of the sensing elements is measured. A sign of violation of the integrity of the shell of a linear thermistor sensor, through which a corresponding failure signal is generated in the fire detection unit, is the achievement of the minimum acceptable insulation resistance value.
EFFECT: increasing the reliability of the fire detection device or overheating.
7 cl, 3 dwg
