FIRElink

Air Sampling Fire Detection

An Air Sampling Fire Detection System is one which utilises the suction of air in conjunciton with small pipe work to sample the air for smoke. Air sampling detection is up to 200 times the sensitivity of a point detector.

How Air Sampling Works

With strategically placed pipes and sampling holes, an air impeller can sample the air by drawing it along the pipe and into the detector measuring chamber. This aspirating smoke detection system is designed to provide an extremely high level of sensitivity to smoke detection, therefore detecting smoke at an earlier stage in the developement of a fire.

Where Air Sampling Can Be Used

Capillary sampling is a method of locating smoke sampling points remote from the main sampling pipe. This is particularly useful where the main sampling pipe cannot be routed through the area requiring protection for either technical or aesthetic reasons. The actual capillary sampling point assembly may be known as a ‘remote sampling point' or ‘extended sampling point'. The technique uses short lengths of flexible tubing that branches off from the main sampling pipe.The end of the flexible tube is fitted with an assembly to achieve the desired air flow rate for the application.

False Alarm Reduction

With the high sensitivity of air sampling systems, there is an increased chance of false alarms. However, with Hochiki FIRElink, false alarms are reduced by unique dust discrimination. Threshold levels can be set, indicating large dust particles into the scattering volume.

High Sensitivity Sampling

High sensitivity air sampling is provided by the obscuration method, and when a pre-defined density of smoke appears in the chamber, the system will go into alarm.

Return Register & Duct Sampling

Sampling air at return air registers and in extract air ducts is an effective, convenient and flexible method of detecting smoke from protected areas that have a constant air flow created by mechanical air handling plant. Typical examples - computer, telephone switch rooms, micro-electronics clean rooms, atrium and auditorium areas, etc. This method of sampling can effectively protect large volumes at a relatively low cost. It can also offer unobtrusive coverage, which may be essential for some applications. Duct sampling uses a sampling pipe or ‘duct probe' which penetrates a return air duct in such a way that the sampling holes are placed directly in the path of the air flow. An air sample is taken by the duct probe and drawn back to the detector.

Expandable & Configurable

Dilution can be a potential problem if the pipe design has not been carefully considered. With FIRElink, pipe work is customisable to help allocate sampling holes in specific locations for precision, accuracy and efficiency in the sampling.