AU101SD
ADDRESSABLE INTELLIGENT SMOKE DETECTOR
The primary purpose of the AU101SD Addressable Intelligent Smoke Detector is to detect the presence of smoke within its surveillance area. When the smoke reaches the alarm threshold level, it promptly triggers an alarm signal to the fire panel.
Highlighted features of this multisensor include:
- Ultra-sensitivity: It possesses an exceptional level of smoke sensitivity, enabling it to trigger early warning alarms.
- Real-time smoke level monitoring: serves a multitude of purposes, one of which is its crucial role in detecting and assisting in fire rescue operations. Additionally, it enables remote monitoring of temperature levels in different areas of a building, such as a computer server room, ensuring that real-time temperature data is constantly available for optimal environmental management.
- Discrimination of dust contamination: The detector is capable of distinguishing between dust contamination on the sensor chamber and the presence of actual smoke. This feature helps prevent false alarms caused by contamination.
- Ultra sensitivity
- Real time smoke level info
- Discrimination of dust contamination and smoke
- Electrical supervision
- Soft addressing
- Corrosion protection
- Remote Sensitivity alteration
- Remote test facility
- Bi-colour LED indication normal and alarm
- Dual LED for 360 deg viewing
- Transient voltage protection up to 2.4KV
Electrical Specifications
Operating voltage : 18-24V DC
Quiescent current : 200µA
Alarm current : 1mA
Indications
Normal indicator: Green LED (Blinks during scan)
Alarm indicator : Red LED (Glows steady)
General Specifications
Smoke sensitivity : 0.5 – 3.5 %obs/foot
Operating temperature : -10ºC to 55ºC
Storage temperature : -10ºC to 60ºC
Humidity : 0-95% RH(Non-condensing)
Color : White
Housing : Polycarbonate
Terminals : Stainless steel
Dimensions(DiaxH)
WithoutBase : 100x34mm
With Base : 100x46mm
Weight
Without Base : W-73
With Base : W-113
What is a smoke detector and how does it work?
Smoke detector is a measuring instrument that measures the level of smoke in its surveillance. It will raise an alarm only when the level of smoke exceeds its pre-set upper limit/threshold values.
Photoelectric/Optical Smoke detector work on a common light scattering principle. Smoke 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 density of smoke. If the intensity of received light drops below a pre-set threshold level, fire alarm is triggered confirming fire.
Unit of measure for level of smoke is Obscuration/foot (Obs/ft).
Photoelectric smoke detectors are highly sensitive to visual particles of smoke and also respond quickly to smouldering fires.
Addressable smoke detectors are wired using 2*1.5 sqmm copper cables from control panel.
WHAT ARE THE MAIN PARTS OF SMOKE DETECTOR AND IT’S FUNCTION ?
- Light Source: A photoelectric smoke sensor consists of LED (Light Emitting Diode) as a light source and a photodetector.
- Chamber Design: The sensor chamber is designed to allow ambient air to flow freely while preventing external light from entering the sensing chamber.
- Scattering of Light: In normal conditions, the emitted light from the LED does not directly reach the photodetector. However, when smoke particles enter the chamber, they scatter the light, causing some of it to be redirected towards the photodetector.
- Detection Process: The photodetector senses the scattered light, and when a certain threshold is reached, it triggers the smoke alarm.
WHY SMOKE SENSOR REQUIRES CLEANING AND HOW TO CLEAN CONTAMINATED SENSOR ?
Smoke sensor chamber shall be maintained dark for effective smoke detection. The smoke chamber is vulnerable to get dust contamination due to pollution . Contaminated sensors tend to provide false alarm signal. Control panel has provision to check level of contamination, user can periodically check the level of contamination, if any contaminated sensors are found those sensors shall be removed for cleaning and other sensors can be kept undisturbed. If any sensors are found more contaminated, control panel will raise an contamination alarm to alert user.
WHAT IS THE LIFE OF SMOKE DETECTOR AND WHY IT REQUIRES A PERIODIC CALIBRATION ?
Life of smoke detector is too short, it may give correct measurements hardly for two years. Smoke detector works on photo electric principle. Smoke chamber LED and its allied circuit gets deteriorate due to aging, hence the sensitivity of smoke detector losses it’s sensitivity. Out of range sensitivity detector may not deliver its function. Hence the smoke detector required periodical calibration. ( refer IS 2189 )
