1. Introduction
Point detectors have a certain limitation in many monitor area, and standard smoke detectors are not qualified when
consider the challenging environment condition and interference factors. So these applications need to use special fire
detection technology, for example, aspirating smoke detectors (ASD). Driven by the new European standard EN 54-20,
ASD achieved a new level in detection speed and reliability.
New European standard EN 44-20 plays an important role in the application of ASD. The automatic fire detector is
divided into three types: Grade A represents a very high sensitivity, Grade B represents a high sensitivity, and Grade C
represents a standard sensitivity. In addition, it is worthless as the response sensitivity of detector whose sample aperture is
Grand C equals to the normal point smoke detector[1]
.
In the past, the tests focus on the reactive state of the ADS’s evaluation device. But now, what we pay attention to are the
reactive state of the whole system, including the sample line, sample aperture and sample device of ASD. ASD has been
applied on some special places like large space, high building, logistics storage, and clean room.