FLAME DETECTION SYSTEMS IN SOUTH AFRICA
Flame detection systems are designed to identify the optical radiation produced by an open flame. They provide specialist fire detection for industrial and high-risk areas where a rapidly developing fire may need to be recognised before smoke or heat reaches a conventional detector.
FJ Group Africa designs, supplies, installs, commissions and maintains flame detection systems across South Africa. Each solution is selected around the fuel, expected fire type, detection distance, field of view, environmental conditions, hazardous-area classification and required system response.
What is a flame detector?
A flame detector is a line-of-sight device that monitors ultraviolet, infrared or combined wavelength bands associated with combustion. It compares the radiation with recognised wavelength and flicker patterns. A valid signature meeting the sensitivity and timing criteria produces an alarm.
It does not wait for smoke to travel or the surrounding temperature to rise, but it must have an unobstructed view of the hazard.
Types of flame detection technology
The correct technology depends on the fuel and background conditions. Common options include:
- Ultraviolet detection: Monitors UV from selected flames. Welding, electrical arcs, lightning and UV-absorbing contaminants must be considered.
- Infrared detection: Monitors selected IR bands and flame flicker. Designs have different fuel and false-source limitations.
- UV/IR detection: Requires a suitable combination of ultraviolet and infrared signals.
- Multi-spectrum infrared or IR3 detection: Compares three IR bands to identify flame characteristics and reject selected non-fire sources.
Range, response, fuel approvals, field of view and environmental limits must be confirmed from approved product data.
How does IR3 flame detection work?
An IR3 detector compares three infrared bands, looking for flame radiation and low-frequency flicker while checking known non-fire patterns.
This can improve rejection of sunlight, hot surfaces, lighting or welding, but no detector is immune to every false source.
IR3 is often considered for hydrocarbon risks. Response to alcohol, hydrogen, metal or other specialist fires depends on the product's tested fuel performance and must not be assumed.
Where are flame detectors suitable?
Flame detection is commonly applied in areas with a credible open-flame risk and where rapid optical detection supports the fire strategy. Typical applications include:
- Fuel storage, transfer and loading areas
- Petrochemical, oil and gas facilities
- Turbine enclosures, generators and power-generation plant
- Chemical processing and selected manufacturing areas
- Aircraft hangars and aviation maintenance facilities
- Mining, mineral processing and conveyor risk areas
- Paint spray booths and flammable-liquid processes
- Tank farms, pump stations and compressor areas
- Waste processing and selected recycling operations
- High-value industrial equipment requiring localised flame monitoring
Flame detectors are not automatically suitable for offices, concealed fires, deep-seated smouldering risks or areas where equipment blocks the view. Smoke, heat, gas, linear heat or aspirating detection may be required as primary or complementary protection.
Benefits of specialist flame detection
Potentially rapid detection. A suitable detector can recognise open-flame radiation without waiting for smoke or heat to travel.
Longer-distance monitoring. Approved products can monitor defined distances within a tested field of view.
Industrial configurations. Certified flameproof, intrinsically safe and weather-protected models are available.
False-source discrimination. Multi-spectrum processing can reject selected light and heat sources.
Flexible integration. Outputs may include relays, conventional circuits, analogue signals or addressable interfaces.
These benefits require correct selection, coverage, installation and maintenance. "False-alarm immune" and "maintenance free" are not guarantees.
Fuel and fire-risk assessment
A flame detector responds to radiation, and fuels produce different signatures. The designer must identify credible fuels, minimum fire size, response time, orientation, distance and atmospheric conditions.
Certified performance should cover the intended fuel or a justified equivalent. A hydrocarbon approval does not prove equal response to alcohol, hydrogen, coal dust, metal or specialist risks.
Smoke, vapour, steam, oil, ice or dirt can reduce radiation reaching the sensor. Tolerance is model-specific.
Field of view, distance and positioning
Coverage is based on a three-dimensional field of view and tested distance, not a simple floor-area figure. The credible fire must remain within the approved cone of vision.
Pipes, vessels, vehicles, stock and structures create blind spots. Multiple viewing angles may be required, and brackets must remain stable.
Sunlight, hot equipment, reflections, welding and vehicle lights must be assessed. Windows can filter UV or IR and are not automatically suitable.
Hazardous-area flame detectors
In an explosive atmosphere, equipment must match the hazardous-area zone, gas or dust group, temperature class, ambient range, enclosure rating and certified installation method.
Flameproof Ex d and intrinsically safe Ex i are different concepts. Ex i normally requires a specified barrier or isolator; Ex d requires approved glands, earthing and enclosure practices.
Only the exact certified model and accessories may be used. A robust enclosure alone is not hazardous-area approval.
Integration and cause-and-effect
Flame detectors can connect to a fire alarm panel, fire-and-gas controller or approved suppression control system through relays, supervised inputs, 4-20 mA signals or supported communications.
Cause-and-effect may operate alarms, shutdowns, fuel isolation or suppression. Voting, confirmation, delays and manual controls must follow the risk assessment. Hazardous plant control requires an approved engineered design.
Installation and commissioning
Installation includes secure mounting, aiming, certified wiring, interfaces and environmental protection. The viewing window must remain accessible.
Commissioning verifies orientation, field of view, sensitivity, alarm delay, outputs and panel text. An approved flame simulator or test lamp should be used without creating an ignition source.
Drawings should show locations, aiming direction, field-of-view limits, target risks, blind spots and interfaces.
Design, standards and documentation
For non-domestic premises in South Africa, relevant requirements may include SANS 10139, SANS 10400-T, the approved fire-safety design, local authority conditions, client specifications, applicable product approvals and manufacturer instructions. EN 54-10 or another applicable adopted product standard may apply to flame detectors.
Hazardous-area projects must also follow the approved classification and applicable SANS/IEC 60079 requirements. The product certificate, protection concept and installation conditions must be checked for the exact model.
Complete supply, installation and maintenance support
FJ Group Africa can support the full flame detection system lifecycle:
- Site assessment and fire-risk review
- Detector technology and model selection
- Coverage mapping and positioning
- Hazardous-area equipment and interface coordination
- Supply, installation, aiming and configuration
- Fire alarm, fire-and-gas or suppression-system integration
- Functional testing, commissioning and handover
- Drawings, system records and user guidance
- Planned servicing, fault finding and system alterations
Inspection and maintenance
Maintenance should check the viewing window, alignment, bracket, cable entries, enclosure, power, self-test, outputs and obstructions. Cleaning must follow instructions.
Functional testing should use the approved simulator and verify the complete alarm path. Coverage must be reviewed after site changes.
Frequently asked questions
How quickly can a flame detector detect a fire?
There is no single response time for every site. Performance depends on the detector, fuel, fire size, distance, orientation, sensitivity, atmosphere and line of sight. The approved product data and project requirements determine the expected response.
What is an IR3 flame detector?
IR3 is a multi-spectrum infrared detector that compares three IR wavelength bands to recognise flame characteristics and reject selected non-fire radiation sources.
Can flame detectors work through smoke, dust or glass?
Some models tolerate limited smoke, contamination or selected transparent materials, but performance is product- and wavelength-specific. The installation must be checked against approved data and tested under representative conditions.
Are all flame detectors suitable for hazardous areas?
No. Only models carrying the required certification for the site's zone, gas or dust group, temperature class and protection concept may be used. The certified installation method is equally important.
Can FJ Group Africa integrate flame detectors with an existing system?
Yes, subject to a compatibility and risk assessment. We verify power, outputs, fault supervision, panel interfaces, cause-and-effect and hazardous-area requirements before confirming the design.
Request a flame detection assessment or quotation
If your facility has a flammable-liquid, gas or high-risk industrial fire hazard, contact FJ Group Africa. We will review the fuel, detection objective, coverage, environment, certification and required response before recommending a suitable solution.
