Fire detector
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An infra-red detector, known as the AFA Infrascan, has been introduced by AFA-Minerva (EMI}, for operation on 24V battery-power supplies. Originally available as a 240V ac model, this latest version is claimed to ensure continuous fire surveillance of installations even during periods of mains power failure, The detector automatically switches to battery supply in an emergency.
Early warning of a fire is derived from detection 'of infra-red radiation and identifica
tion of radiation output from 11111111111111 flames as distinct from other sources. Normally mounted above the area of fire risk, the detector employs a revolving scanning reflector to monitor through 360deg, its line-of-sight extending 10deg above the horizon of the equipment. Although Infrascan's range is virtually unlimited, its recommended radius of detection is between 300ft and 400ft (90m and 120m). The •detector is said to be ideal for use in single-storey buildings with high roofs.
If Infrascan forms part of an automatic protection system, it can operate fixed fire extinguishing systems, such as BCF and CO2, control motorized water or foam valves and switch essential plant or service equipment off or on as required. It can also be used for external surveillance duties. For this type ilia of hazardous area, a flame-proof type housing is available for ths detector. Weighing 8Ib 4oz (3.7kg) it measures 11 tin. (286mm) in diameter and is 11 kin. (292mm) high.
Made by: AFA-Minerva {EMI} Ltd, Twickenham, Middlesex.