High sensitivity smoke detectors

A diagrammatic representation of the Vesda aspiring smoke detection system.So-called ‘aspiring’ smoke detection devices are air sampling smoke detectors that are designed to provide the earliest warning of a potential fire and so to provide enhanced safety in diverse applications. Vesda aspiring smoke detectors reliably measure extremely low concentrations of smoke. They are used in warehousing, telecommunications and electrical facilities, mining, cold storage, manufacturing plants and power stations, as well as the healthcare and commercial sectors. The system is especially well suited to applications where unobtrusive detection is required, in art galleries, for example, modern offices and heritage buildings.

It also carries approval for use in hazardous areas (Factory Mutual Class 1 Div 2) where air quality is poor or temperatures are extreme. Duncan Boyes, chairman of the Centa Group  which specialises in fire protection, notes, “An important feature of this fire detection system is that it allows time to investigate a potential fire and to intervene if necessary, so that damage, downtime and costs caused by a fire can be avoided. The early warning alarm also gives sufficient time for the building to be evacuated.

“The multiple warning levels of the system can be used to trigger different responses at different stages of a fire, from controlling air conditioning, to suppression release.”

The system encompasses a network of pipes with small sampling holes in them, as well as capillary sampling tubes. It operates by continually drawing air into the pipe network via a high efficiency aspirator. Samples of the air are then passed through a dual stage filter before entering the calibrated detection chamber where the air is exposed to a laser light. If smoke is present, light is scattered within the detection chamber and this is instantly identified by the highly sensitive receiver system. The signal is then processed and presented graphically on a monitor.

The detectors can be linked to a fire alarm control panel, a software management system or a building management system via relays or a high level interface, so that the appropriate responses are triggered according to the indicated stage of a fire. The Vesda air sampling smoke detection system is distributed, installed and supported throughout Southern Africa by the Centa Group.

Previous story
keyboard_arrow_upQuality in motion
keyboard_arrow_downQuality in motion

The Vista Duo from Hillaldam Sliding Door Systems is the first bottom rolling hardware for even folding weatherproof aluminium doors

Next story
keyboard_arrow_upSupplying clean water to remote communities
keyboard_arrow_downSupplying clean water to remote communities

More than 1 200 PlayPump systems already installed in rural parts of South Africa, Mozambique, Lesotho, Swaziland and Zambia, are, with the power of children’s play, bringing clean water to about two million people. By 2010, the combined efforts of PlayPumps International  and the international organisations or individuals that fund the set-up of the PlayPump systems aim to have installed 4 000 pumps in 10 countries in Sub-Saharan Africa, making clean drinking water accessible to up to 10 million people. Expansion over the next few years will see PlayPump systems in Ethiopia, Kenya, Malawi, Tanzania, and Uganda.

keyboard_arrow_upCities of tomorrow in the spotlight at African construction event
keyboard_arrow_downCities of tomorrow in the spotlight at African construction event

Mega housing projects and large-scale infrastructure development are on the rise in 2018 amid growing population across South Africa and the greater African region.

keyboard_arrow_upBayferrox pigmentation for upmarket helicopter workshop floors
keyboard_arrow_downBayferrox pigmentation for upmarket helicopter workshop floors

Bayferrox pigmentation supplied by Chryso South Africa was used by OnTime Readymix Concrete for the coloured flooring of a new private helicopter workshop at Rand Airport’s Hangar 24 at the end of 2017.

keyboard_arrow_upREHAU uPVC windows fulfill the mandate
keyboard_arrow_downREHAU uPVC windows fulfill the mandate

KEY FACTS: Location: Nairobi, Kenya System: REHAU 60mm uPVC Window System Architect: Cocoon Studio, Kenya Customs Aluminium, a REHAU Authorised Partner, manufactured high security REHAU uPVC windows and doors for a customer in Nairobi, Kenya.