Quick answer
There is no universal number of gas detectors for a factory — the count depends on the number and location of potential leak sources, room geometry, ventilation, the gas's behaviour in air and the coverage radius assigned to each detector, all assessed during system layout planning. A small boiler room may need one or two points; a large plant with several fuel systems may need many — only a marked-up layout review gives the reliable answer.
Why there is no fixed number
Gas detection is risk-based, not area-based. No standard gives a universal "one detector per X square metres" rule that fits every fuel, every room and every process. A single large room with several leak sources may need more detection points than several small rooms with one source each.
The count should always be the output of a layout review, never an input to it: too few detectors leaves gaps that defeat the purpose of the system, while too many wastes capital and maintenance effort.
The factors that set detector count
A competent layout review weighs several factors together. Leak sources come first: valves, flanges, compressors, burners, cylinder manifolds and pipe joints are the points where gas can realistically escape. Room geometry matters next — compartments, mezzanines, pits and ceiling height.
Ventilation and air movement determine whether a leak dilutes or is driven towards an occupied area. Gas behaviour — whether the gas is lighter or heavier than air — decides mounting height, and each detector is assigned a coverage radius so that every likely release point falls within range of a detection point. Our system design guide explains how these factors are combined in practice.
Typical high-priority areas in Malaysian factories
Certain areas recur as high-priority in typical Malaysian scenarios. Boiler rooms combine fuel trains, burners and enclosed space — see the boiler room detection guide. LPG storage areas and cylinder cages hold pressurised flammable gas near valves and changeover points — see the LPG detection guide.
Chemical storage rooms may involve both flammable and toxic vapours, and battery rooms can release hydrogen during charging. These are typical scenarios, not site findings.
How a layout review turns this into a detector schedule
The practical step is a layout review: mark leak sources on floor plans or a site survey, then propose detector positions against coverage radius and gas behaviour. The output is a detector schedule — quantity, target gas, location and mounting height per point — ready for pricing and installation.
Agree the schedule before ordering, since it drives equipment selection, cabling and controller configuration. Contact U-Tai Safety Malaysia with your floor plans and a description of the fuel or gas systems, and we can help prepare a layout proposal and detector schedule for quotation.