IR gas detector monitors electrical assets
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Flir Systems product story
Edited by the Engineeringtalk editorial team
Dec 26, 2007
The ThermaCAM GasFind IR LW is optimised for leak detection of sulphur hexafluoride, a gas used as an insulator in electrical equipment.
The introduction of Flir Systems' ThermaCAM GasFind IR gas leak detector has allowed companies to incorporate infra-red into their leak detection and repair programmes (LDAR) providing a far quicker and more efficient method than traditional toxic vapour analysis.
This success has led to further product development and the introduction of an infrared camera specifically for detecting greenhouse gases that are not visible in the mid-wave infra-red band; sulphur hexafluoride and anhydrous ammonia are typical examples.
This new camera is the ThermaCAM GasFind IR LW.
It is based on the standard model but as its suffix suggests it operates in the long-wave infra-red band.
Sulphur hexafluoride (SF6) is a relatively expensive man-made chemical released by electrical substations where it is used as an electrical insulator in equipment that transmits and distributes electricity.
It is also used as a cover gas in the magnesium industry, in the manufacture of semiconductors, for thermal and sound insulation, as a tracer gas for ventilation efficiency and in medical applications.
Although SF6 is extensively recycled leakage is still a concern.
Excessive exposure can harm human health and of the internationally monitored greenhouse gases it has, by far, the greatest global warming potential - 23,000 times that of CO2.
This gas is included in the European Pollutant Emission Register, a vast database that catalogues European industrial pollution.
It requires affected industrial plants to identify leaks from a range of 50 pollutants that they emit into the air or water in quantities over a given threshold.
The ThermaCAM GasFindIR LW allows plant managers to see, and hence, reduce the emission of sulphur hexafluoride with ease.
Although the detection of SF6 is a key selling point for this new camera it is not by any means the only gas that it can detect.
It is designed to see a wide range of other gases too including anhydrous ammonia that is widely used as a refrigerant in large cold-storage facilities.
The new ThermaCAM GasFindIR LW actually shows any leakage point or points of sulphur hexafluoride gas in real time.
It can detect small leaks from several metres away and big leaks from hundreds of metres away and in trials has proved able to see leaks that have eluded a traditional active laser system.
In addition to making leaks visible, the camera is able to scan large areas quickly, greatly increasing inspection speed and improving overall plant safety.
It can also be used without stopping any operation or process.
At the heart of the cooled ThermaCAM GasFindIR LW is a 320 x 240 quantum-well infra-red detector (QWIP) that is optimised to detect sulphur hexafluoride and other gases.
Due to their absorption characteristics, the gas leaks appear as black smoke on the camera's viewer and the events can be captured on video for easy documentation or e-mailing.
In common with its forerunner, this model is designed for operation in harsh environments and in a wide temperature range from -50 to +15C.
It has an industrial shock rating of 40g and can detect gas levels down to 5g/h.
A scan rate of 50Hz or 50 frames per second allows the efficient inspection of dynamic events without image distortion; a 25mm lens with 22-degree field of view is provided as standard with the camera but 11- and 5.5-degree lenses are also available.
Weighing under 2.3kg the ThermaCAM GasFindIR LW has an NETD of less than 35mK.
The camera is designed for single-handed use and fingertip control provides easy access to all functions.
Auto-level capabilities are provided for optimal clarity and images can be viewed on the built in colour viewfinder or on the LCD screen of the video recorder.
Rechargeable batteries provide 4h of continuous use.
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