AW103MD
Wireless Addressable multisensor
The AW103MD Addressable Intelligent Multi-Sensor is equipped with both a built-in smoke sensor and a thermal sensor. The smoke sensor is designed to detect the presence of smoke within its surveillance area. Once the smoke reaches the predetermined alarm threshold level, the sensor promptly triggers an alarm signal to the fire panel, ensuring a timely response to potential fire incidents. Similarly, the thermal sensor measures the temperature within its surveillance area. It is capable of detecting sudden rises in temperature or abnormal temperature levels. When such conditions are detected, the sensor triggers an alarm signal to the fire panel, alerting relevant personnel to take necessary action. This wireless device communicates with the control panel at a frequency of 433.92 MHz. The unit is powered by a built-in AA battery. When the battery power is low, it communicates with the control panel to alert for replacement. This unit is mainly used in situations where wiring is not feasible.
Highlighted features of this multisensor include:
Ultra-sensitivity: It possesses an exceptional level of smoke sensitivity, enabling it to trigger early warning alarms.
- Ultra smoke sensitivity
- Rate of rise and fixed temperature detection
- Automatic drift compensation
- Corrosion protection
- bi-colour LED to indicate healthy and alarm condition.
- Dual LED for 360 deg viewing.
- Low battery warning
What is a multisensor sensor and how does it work?
Multisensor is an instrument that houses both smoke and heat sensors for a more guaranteed fire detection.
The multisensor detector is only a measuring instrument that monitors the level of smoke and heat in its surveillance. It will raise an alarm only when the level of smoke/heat exceeds its pre-set upper limit/threshold values.
Its working functions combine the optical smoke detection principle & rate of rising heat detection principle.
The Photoelectric/Optical Smoke detection part works on a common light scattering principle. A multisensor detector contains a chamber that consists of a light emitter usually a LED and a light a sensitive device like a photodiode that receives all the light directly emitted by the LED.
When the smoke enters the chamber, the intensity of light received by the photodiode reduces due to the density of smoke. If the intensity of received light drops below a pre-set threshold level, the fire alarm is triggered confirming fire.
Further, for heat detection, a thermistor device is used in the detector to monitor temperature levels. The resistance offered by the thermistor device decreases with an increase in heat sensed by it, thereby increasing the values of voltage and current drawn by the circuit. The detector’s intelligence algorithm monitors the difference in voltage values at continuous intervals of time. The higher the difference in voltage, the higher the increase in heat.
In the case of fire, the rise in temperature is rapid. Meaning, in less time the difference in temperature measured is very high. This parameter of the rate of rising in heat is considered to raise an alarm confirming the presence of fire.
The alarm is also raised when the live temperature exceeds the pre-set upper limit/threshold values of the detector.
The unit of measure for the level of smoke is Obscuration/foot (Obs/ft). Similarly, Celsius is the preferred unit for measuring heat levels.
Multi sensors provide more reliable fire warnings by responding quickly to smoldering fires.
others in series
Wireless Addressable Optical Smoke Detector
Model No: AW103SD
Wireless Addressable Optical Heat Detector
Model No: AW103HD
