Fire monitoring system and fire sensor

A fire monitoring system capable of detecting a fire by connecting a plurality of fire sensors to a receiver via a transmission line and then transmitting detection data from the plurality of fire sensors repeatedly in predetermined order in response to respective instructions issued from the receiver;

• wherein each of the fire sensors comprises:
• a plurality of sensor portions of different types;
• sensor processors for outputting detection data of plural types, based on detection signals from the plurality of sensor portions;
• and
• a mode switching portion for switching a mode which corresponds to responding detection data in response to a mode switching instruction issued from the receiver, and sending selectively the detection data which corresponds to a current switched mode in response to a data request instruction issued from the receiver;
• and
• wherein the receiver comprises:
• a mode switching indicating portion for switching the mode by transmitting the mode switching instruction which selects the mode of the detection data to the fire sensors, and
• a fire judging portion for judging the fire by receiving the detection data which is sent from the fire sensors in response to transmission of the data request instruction;
• wherein each of the fire sensors includes, as the plurality of sensor portions, a smoke sensor portion for detecting a smoke generated by the fire to output a smoke signal, and a heat sensor portion for detecting heat radiated by the fire to output a temperature signal;
• each of the fire sensors includes, as the sensor processors, a smoke sensor data processor for converting the smoke signal into smoke data responding to the receiver and then holding the smoke data, a temperature sensor data processor for converting the temperature signal into temperature data responding to the receiver and then holding the temperature data, and a multi-sensor data processor for correcting the smoke signal based on the temperature signal to convert the smoke signal into corrected smoke data responding to the receiver and then holding the corrected smoke data;
• and
• the mode switching portion has switching functions of a smoke sensor mode to send the smoke data, a temperature sensor mode to send the temperature data and a multi-sensor mode to send the corrected smoke data, and then switches the mode into one of the smoke sensor mode, the temperature sensor mode and the multi-sensor mode based on the mode switching instruction issued from the receiver.

A fire sensor which is connected to a receiver via a transmission line and transmits detection data in response to an instruction issued from the receiver, comprising:

• a plurality of sensor portions of different types;
• a sensor processor for generating plural types of data based on the detection data from the plurality of sensor portions;
• and
• a mode switching portion for switching a mode which corresponds to the detection data in response to the receiver according to a mode switching instruction from the receiver, and sending selectively the data which corresponds to a current switching mode according to a data request instruction from the receiver;
• wherein said plural types of data include multi-sensor data which is corrected detection data from one of said plurality of sensor portions based on detection data from a remainder of the plurality of sensor portions.