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28/03/2017 / Graham Lowe

Something To Ignite Your Interest…

Here at Hochiki we often stress the importance of selecting the right technology for the application. For example, whilst traditional point detectors may be the perfect solution for offices and classrooms, they can fail to cope in warehouses, factories and other dusty environments. To prevent false alarms, you therefore need to consider whether other technologies such as air sampling systems or flame detectors might be more appropriate. In an earlier blog, we explained how air sampling systems with relative scaling could be used in polluted environments, therefore in this blog we are going to focus on flame detectors.

Flame detectors can be ideal for a wide range of applications, including; refineries, waste recycling facilities, biomass storage facilities, engine rooms, fuel loading racks and many more environments. They use infrared and/ or ultraviolet sensors which respond to specific wavelengths of light (or black body radiation). The spectrum of light is vast, even human bodies generate some black body radiation, flame detectors are therefore designed to only respond to objects further along the spectrum.

flame detection spectrum

Of course, sunlight can potentially cause a problem as it falls into this range. You should therefore ensure that, as well as detecting radiation, you select a flame detector that requires the light to be flickering with a random motion. It is important that the flicker is random, because this indicates a natural flame, most probably caused by a genuine fire. A man-made flame, from a welding torch for example, would have a controlled flame and you would not want this to cause a false alarm.

Another key issue to watch out for is the detection of hydrocarbons. Some detectors that look at hot carbon dioxide produced from a flame cannot see through glass, they also cannot detect fuels such as hydrogen and fluorine. It is therefore advisable to select a flame detector that can detect any fuel with one detector and will respond through glass.

Hochiki offer four different types of flame detectors, all of which have been designed to the highest of standards. Our conventional infrared flame detector (DRD-E) features a single infrared sensor and fits onto Hochiki’s common mounting base making it easy to install. We also offer a flame detector in alloy housing with three infrared sensors (IFD-E) or a UV/Dual IR flame detector in alloy housing (16591). For dangerous environments we can also offer an infrared flame detector in explosion proof housing (IFD-E(EXD)). Hochiki also have intrinsically safe and marine approved variations available; please visit our website or phone our customer support team on +44 (0) 1634 260133 to find out more.

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