The Cirrus CCD is the only aspirating detector available to identify the optically invisible fire particulate by utilising the unique ‘Cloud Chamber Detection’ (CCD) technology.
History tells us that in reality there are really only two types of aspirating detector technology. These technologies are ‘Cloud Chamber’ aspirating detection identifying optically invisible fire particulate, and laser or LED ‘Optical’ aspirating detection identifying small amounts of visible smoke.
Depending on the materials burning, particularly in the many modern applications for aspirating detection systems, some fires burn with only a small amount of visible smoke, whereas others burn with greater volumes of visible smoke.
It is known that particles smaller than the wavelength of visible light occur spontaneously as a material is overheated, and in numbers far above those present in a normal ambient environment. The Cirrus CCD utilises the Wilson Cloud Chamber principle to detect the sub-micron particles that are generated at the incipient, and all other stages of a fire.
A filtered air sample is delivered to the detector via a centrifugal blower, a portion of which is diverted into a humidifier. At 100% relative humidity, the sample is directed to the Cloud Chamber where, because of cooling, due to rapid vacuum expansion, water condenses onto the small particles. Consequently, the condensation around each particulate increases the overall size, forming a ‘cloud’. The cloud can then be detected by the measuring system of the Cloud Chamber. The density of the cloud being proportional to the number of particles present. The result is a continuous signal that corresponds to the particle concentration. This signal is used to provide a staged alarm sequence with four alarm levels.
The Cirrus CCD is a self-supervised system that continuously monitors for correct operation. Any problem is immediately reported at the detector display, buzzer and by operation of a fault relay.
SKU: 61-986-CX
