Four Zones Aspirating Smoke Detector
Multi-zone aspirating smoke detectors currently available on the market are mostly valve scanning type. Such products have only one smoke detector inside. The pipe in alarm is judged by switching on and off the mechanical valves located at the pipe inlet in sequence to find out the pipe having the most smoke. The kind of method to identify the alarm pipe (zone) is usually called “scan” process. Although this approach can work, but the scan process is time consuming.
There is a lag to identify the alarm zone because it would take probably 40 to 60 seconds, or even more time to complete the scan process. More importantly, in an very early warning fire detection (VEWFD) application, there are high chances that the scan process would fail or misjudge the alarm pipe because the smoke increase is small when the fire is in incipient stage. It’s difficult for the device to distinguish the smoke change from the variation of smoke background level on different pipes protecting different areas.
However, the most important advantage among all is that FANFARE is more sensitivity and/or more immune to false alarm compared to four pipes one detector product. This is because the area (or the number of sampling points) covered by each detector of FANFARE is much less than traditional four pipes one detector product. This makes the sampling point sensitivity of FANFARE four times more sensitive compared to four pipes one detector product if their detector alarm threshold settings are the same. On the other hand, FANFARE is very much immune to false alarm compared to four pipes one detector product when their sampling point sensitivity is the same. To have equal sampling point sensitivity, the detector alarm threshold setting of four pipes one detector product should be 4 times more sensitive to FANFARE. The more sensitive the detector alarm threshold is, the more the probability to false alarm.
Features
AVA uses high power, short wave blue LED as the detection light source. It is very sensitivty to small smoke particles generated during the incipient stage of a fire, at which time the some is invisible to human eyes. The highest alarm sensitivy of AVA high sensitivity smoke detector is 0.005%/m, which is 1000 times more sensitive to conventional point type smoke detector.
- Four Sets of High Sensitivity Aspirating Smoke Detectors.
- Each High Sensitivity Aspirating Smoke Detector has individual Aspirator and Flow Sensor.
- Optimization for Maximum Pipe Length
— Total Pipes: 400m (up to 72 sampling holes on four pipes)
- Optimization for Maximum Sampling Holes
— Total Pipes: 100 holes (total pipe length up to 240m)
- Built in Four Zones Bargraph Alarm LED Display
- Built in LCD Programmer
- Optional Zone Relay Board
*Note: Maximum pipe length and maximum number of sampling holes cannot be achieved at the same time. When maximum pipe length is the major design consideration, the number of sampling holes must be reduced. On the other hand, when maximum number of sampling holes is the major design consideration, the pipe length must be reduced.
