plamenski-javljljalnik-2In some cases fire detection with conventional smoke detectors is not possible. This is especially true for detection of fires from easily flammable substances that burn with a flame, as well as for fires outdoors and in larger closed spaces. In these cases, 3D flame detectors have proven to be the most efficient. In contrast to the majority of smoke detectors, where the smoke has to penetrate into their measuring chamber so that the device can detect and report an alarm, flame detectors can detect a flame at large distances and thus expose the fire in its earliest stage.

plamenski-javljljalnik-3The detectors discover radiation of the flame in different parts of the spectrum: the visible, ultraviolet and infrared; individually or in various mutual combinations. When reporting a fire some other properties of the flame are considered, such as flicker dynamics and the radiation ration of flame intensity with respect to radiation from the sun and the surroundings. Cutting-edge technology and software algorithms for flame detection and prevention of false alarms affect the properties of the detector and determine its price. There is a wide range of flame detectors available, both in classic as well as in explosion-proof versions.

It is important to note that some detectors may not detect the flame of substances that do not contain carbon!



Detector Technology Benefits/Price Disadvantages Scope
Infrared (IR) High detection speed, medium sensitivity, low price. The operation is influenced by the ambient temperature, false alarms may be a consequence of IR radiation in the area. Fires of burning hydrocarbons, for use in closed spaces.
Ultraviolet (UV) Maximum detection speed, medium sensitivity, low price. The detector is sensitive to UV radiation sources, which may cause a false alarm: welding, sparks and electric arcs. Fires of burning hydrocarbons, hydrogen, selenium, ammonia and various metals fires, use in closed spaces and outdoors.
Dual sensor (UV/IR) High detection speed, high sensitivity, rare false alarms, moderate price. Thick smoke or fumes and a dirty signal window reduce its sensitivity. Fires of burning hydrocarbons, hydrogen, selenium, ammonia and various metals fires, use in closed spaces and outdoors.
Multiple sensors (IR) High detection speed, medium sensitivity, rare false alarms, the detector also detects an invisible hydrogen flame. Ambient temperature may affect its operation: false alarms may be caused by heat-emitting bodies radiating flashing IR light. Fires of burning hydrocarbons and hydrogen in closed and open spaces.
Triple sensor (IR3) High detection speed, maximum sensitivity, almost no false alarms, the largest detection area, moderate/high price. A powerful source of infrared radiation in immediate vicinity may cause a false alarm. Fires from burning hydrocarbons in indoor spaces.



20/20 MI notranji/zunanji (IR3) 40/40 I zunanji (IR3) 20/20 MPI notranji (IR3)


There is a large number of flame detector versions available, all of them intended for general use, as well as for use in specific environments. Based on many years of experience and in close cooperation with the manufacturer, the experts from our company Zarja Elektronika will help you choose the most suitable model and its installation. Fire detection will be reliable and unwanted false alarms due to interferences from the surroundings will be prevented.


Type Technology Heated window Detection distance* Description
40/40 M Multi IR Yes 65m The detection of hydrocarbon and hydrogen flames [fuel and gas fires] over long distances. The most advanced technology built-in prevents false alarm detection [Ex area: EX de, EX tD, Ex II].
40/40 I Triple IR CIR3) Yes 65m Detection of fuel and gas fires over long distances with maximum resistance to false alarms [Ex area: EX de, EX tD, Ex II].
40/40 L UV/IR Yes 15 m Built-in combination of an UV and IR sensor, in which the IR sensor detects hydrocarbon fires of gas and fuels, hydrogen and hydroxyl fires, as well as inorganic and metal fires. It is intended for use in indoor and outdoor spaces [Ex area: EX de, EX tD, Ex II].
40/40 L4 UV/IR Yes 15 m The detector is similar to the 40/40 L model, except it only detects hydrocarbon fires. It can be used outdoors and indoors [Ex area: EX de, EX tD, Ex II].
40/40 UFL UV/IR Yes 15 m The SharpEye UV-IR flame detector primarily meets two main requests: fast response time and prevention of false positives. Namely, the UV sensor contains a special logic circuit, which prevents false alarms due to sunlight [Ex area: EX de, EX tD, Ex II].
40/40 U UV Yes 15 m It detects hydrocarbon gas and fuel fires, “invisible” hydrogen, hydride, ammonia, selenium and other organic substance fires. It has minimum consumption and a more compact, lighter design [EX de, EX tD, Ex II].
40/40 R IR Yes 15 m The detector detects hydrocarbon gas and fuel fires using integrated advanced analysis algorithms. It operates at a wavelength of 4.4 micrometers and at the same time has the highest sensitivity and resistance to false alarms due to sunlight and various IR emitters. The detector is certified for areas with risk of explosion [de EX, EX tD, Ex II].
20/20 MI Triple IR CIR3) No 40 m Compact Triple IR flame detector in a robust stainless steel housing. Retains all the advantages of the IR3 technology – long distance detection and maximum resistance to false alarms. It is available in a classic or an explosion proof ** [Ex II, EExia, T4] version.
20/20 ML UV/IR No 20 m It detects hydrocarbon gas and fuel fires and hydrogen, hydroxyl, inorganic and metal fires. It is a low-cost detector in a compact, lightweight but robust housing for general use [non-explosive environments].
20/20 MPI Triple IR No 43 m The 20/20 MPI is a low-cost, high-performance triple IR [IR3] flame detector in a lightweight polycarbonate housing. It has all the advantages of the IR3 technology – signalling over long distances and preventing the detection of false positives. _ j
*The detection distance refers to a fire in a container of 30 x 30cm. **Relays do not meet the 20/20 EX certified version.



Simulators of long-range fires


The Sprectrex long-range fire simulators are intended for flame detector testing in areas where testing with real fire is not possible. The testing of detector performance is required in certain industries and to meet regulatory requirements.

  • P/N 2020 – 310 for the IR flame detector
  • P/N 2020 – 311 for the UV and UV-IR flame detector
  • P/N 2020 – 312 for a single IR flame detector
  • P/N 2020 – 313 for a hydrogen flame detector

Installation for the observation of the interior of a space


The installation for the observation of the interior of a space (sample chambers, housings…) allows detection of the flame in areas with high temperatures, or the installation is simply not possible. The kit includes a special installation device and optical window, which allows you to install into/onto a high temperature applications. It is used in conjunction with any flame detectors of the Spectrex 40/40 series.

New air shield


The use of flame detectors in heavily polluted or dirty environments requires frequent cleaning of the optical windows. The air shield for SharpEye 40/40 series detectors is intended for applications in the most aggressive of environments. It is suitable for an aluminium or a steel housing (not compatible with the 40/40M type).

Tilted installation

plamenski-javljljalnik-10The tilted mounting bracket allows for precise orientation of the detector for optimal coverage of the observed surface. That is how it is possible with precise moving of the mechanism to achieve the desired direction and the surface, thus ensuring the maximum efficiency of observing the flame.