Conventional Multisensor

AC103MD

Conventional multisensor

This Conventional Multisensor houses both smoke & heat sensors for monitoring the level of smoke/heat in its surveillance. It switches to alarm state when the level of smoke/heat exceeds its pre-set value. It communicates its zone number to the control panel for location tracking.

Exclusive Features
  • Wide operating voltage
  • Low standby current
  • Drift compensation technique for false alarm immunity
  • Insect-resistant screening
  • Easy to maintain/service
  • Dual bi-color LED indication for 360° viewing angle
Technical Summary
Electrical Specifications
Operating voltage : Nominal 12/24V DC
                                   Minimum 9V DC
                                   Maximum 26V DC
Quiescent current : 50µA
Alarm current : 25 mA at 24 V
                            12 mA at 12 V
 
Indications
Normal : Green LED (Blinks every 8 sec)
Alarm : Red LED (Glows steady)
 
General Specifications
Smoke sensitivity : 1+/- 0.5%obs/ft
Thermal sensitivity : 57ºC 
Operating temperature : 0ºC to 49ºC
Storage temperature : 5ºC to 40ºC
Humidity : 0-95% RH (Non-condensing)
Color : White
Housing : Polycarbonate
Cycle Time : 4 sec
Contact Clamp : Stainless steel
 
Dimensions(DiaxH)  
Without Base : 100x34mm
With Base : 100x46mm
 
Weight
Without Base : 70g
With Base : 110g
Know More

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 combines optical smoke detection principle & rate of rise heat detection principle.

Photoelectric/Optical Smoke detection part work on a common light scattering principle. 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 density of smoke. If the intensity of received light drops below a pre-set threshold level, 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 increase in heat sensed by it, thereby increasing the values of voltage and current drawn by the circuit. 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 case of fire, the rise in temperature is rapid. Meaning, in less time the difference in temperature measured is very high. This parameter of rate of rise in heat is considered to raise an alarm confirming presence of fire.  

Alarm is also raised when the live temperature exceeds the pre-set upper limit/threshold values of the detector. 

Unit of measure for level of smoke is Obscuration/foot (Obs/ft). Similarly, Celsius is the preferred unit for measuring heat levels. 

Multisensors provide more reliable fire warnings by responding quickly to smouldering fires.

----Visit FAQ to know more

 

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