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Dynamic knowledge of process gas analysis, such as CO, CO2 and O2-content, is extremely important both for process control and plant safety. Laser gas analysis overcomes many of the problems associated with traditional analysis methods, such as the need for frequent maintenance, analysis drift and transport delays to the gas analyser. In-situ measuring provides the plant operator with process information in real time, to enable fast reactions to potentially unsafe situations and to improve process stability. The design of the described laser-based analysers means they are the best placed analytical tool for safety applications in metals industries. The device can measure gases such as oxygen and CO in low and high concentration with accuracy. As well as being able to withstand very rough industrial environments, the sensors are also designed to perform within strong DC magnetic fields. Importantly, no sampling of toxic and aggressive gases like HF is necessary as the measurements are performed in-situ. Other benefits of in-situ laser-based analysers are low maintenance and high resistance to cross-interference and dust.