These systems have become widely used in extremely sensitive applications. This system consists of two main components: a control unit that houses the detection chamber, an aspiration fan and operation circuitry; and a network of sampling tubes or pipes. Along the pipes are a series of ports that are designed to permit air to enter the tubes and be transported to the detector. Under normal conditions, the detector constantly draws an air sample into the detection chamber, via the pipe network. The sample is analysed for the existence of smoke, and then returned to atmosphere. Air aspirating detectors are extremely sensitive and are typically the fastest responding automatic detection method.
