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Control of oxygen levels in many chemical and petrochemical processes is essential to minimize the risk of explosions. Due to their speed of response and low maintenance, oxygen measurement with tunable diode laser (TDL) spectrometers is becoming more and more common.
However, TDLs rely on light absorption to measure O2 levels, and oxygen is a weakly-absorbing gas. In wide pipes, the optical path length required to make an accurate measurement is not a problem, but in narrow pipes, it is.
In this article from Hydrocarbon Engineering magazine, you can discover how METTLER TOLEDO has solved this problem.
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