Protec SF-51-449-00 Cirrus Hybrid Cloud Chamber

Protec SF-51-449-00 Cirrus Hybrid Cloud Chamber

The SF-51-449-00 is a replacement cloud chamber which has been designed for use with the Cirrus Hybrid Aspirating Fire and Smoke Detector.

The Cirrus Hybrid utilises both Cloud Chamber and Scatter Chamber detection technology to monitor for Fire and Smoke through an aspirating pipe system. These two technologies are used together to combine the best attributes of each technology in an algorithm-based system.

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. Cirrus Hybrid utilises the Wilson Cloud Chamber principle to detect the sub-micron particles that are generated at the incipient, and all other stages of fire.

A filtered air sample is delivered to the detector via a centrifugal blower, a portion of which is diverted into a humidifier. At approximately 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 and forms a ‘cloud’.

Consequently, the thermally generated particles cause many droplets to form into the cloud, which is then 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.

Cloud Chamber Water Requirements

Distilled water only, replenished as required, dependent upon environment. Low ambient humidity (<50% R.H) or high ambient temperature (>30C) conditions will increase the water usage.