The EST series intelligent photoelectric smoke detector collects analog data from its photoelectric smoke sensing element and converts it into digital signals. The built-in microprocessor of the detector measures and analyzes these signals, and compares them with the historical data time characteristic curve to determine whether to alarm. The digital filter filters out non fire alarm factors and almost eliminates false alarms.

Each detector's built-in microprocessor can also provideFour auxiliary functionsSelf diagnosis and historical records, automatic generation of detector and module wiring diagrams, independent operation mode, and fast and stable communication.

　　1.Self diagnosis and historical records

Each feature series detector continuously performs self diagnosis to provide important maintenance data. The self diagnosis results are automatically updated and solidified into the detector's non-volatile memory, which can be viewed at any time on the console, PC, or using the SIGA-PRO feature programming/maintenance tool.

The data stored in the detector memory includes:

-Detector model, product serial number, and device address;

-Manufacturing date, operating hours, and last maintenance date;

-The current sensitivity value of the detector and the compensation value for the environment;

-The sensitivity value of the detector at the time of leaving the factory;

-Number of alarm and fault records;

-The date and time of the last alarm;

-The data time characteristic curve before the last alarm;

-Up to 32 fault characteristic codes are used for fault diagnosis.

　　2. Automatically generate detector and module wiring diagrams

The circuit controller remembers the installation position of each serial number device relative to other devices in the circuit. This graphic feature can be used to monitor the installation position of each device, preventing the detector from being mistakenly installed in a different position when reinstalled (such as after cleaning). Once mistakenly installed, the system can automatically exchange its address without false alarms.

The feature data input program utilizes this graphical feature to check the network connections between each device, supported by the dialogue menu and icon menu of the programmer. The system configuration and combination information (device model, device address, line branch) contained in the graphics are stored on the disk and can generate print reports at any time. This method of immediately extracting the current configuration and combination status from an installed system is very fast and effective for reorganizing the system.

By utilizing graphical features, the circuit controller can discover:

-Additional components;

-Missing components;

-Changes in circuit wiring;

-When reinstalling, if the detector is installed in the wrong position, the system will automatically change its address.

　　3. Independent operation mode

The determination of an area alarm is completed by the detector, which has a built-in microprocessor that allows it to operate in independent mode. If there is a communication failure between the detector and the circuit controller for more than 4 seconds, all detectors in the circuit will switch to independent operation mode. The function of this circuit is similar to that of a regular detector. Each detector continues to collect and analyze information around it. If the surrounding environment reaches the pre-set smoke level, the detector will sound an alarm; If the detector is installed on a relay base, the relay will activate.

　　4. Fast and stable communication

The detector is equipped with intelligent circuits, and the system adopts a broadcast based search, which means that a small amount of information needs to be transmitted between the detector and the loop controller. In addition to responding to normal monitoring queries, the detector only needs to communicate with the controller when new faults or alarms occur, which can provide very fast response time and reduce the communication baud rate of the system.

The following benefits have been generated:

-Extended communication distance, with a loop line distance of up to 3 kilometers;

-Improved anti-interference ability;

-Reduced interference to other lines;

-It is not necessary to use twisted pair or shielded wire, ordinary wire can be used, and the loop response time is less than 0.75 seconds.