Chemiluminescense (CLD)

The chemiluminescence, CLD, measuring principle is used for analysis of NO_X. The principle is that a gas flow is led through a reaction chamber in which NO reacts with O₃ (ozone). The NO₂ produced from this process reaches an excited condition, and the molecules are sending out red light. In the reaction chamber a photo detector is placed to measure the amount of red light. To be able to measure NO_X as the total sum of NO and NO₂, a NO₂ to NO converter is installed into the CLD analyser so that NO₂ is converted into NO before it is led into the reaction chamber to react with O₂. The delivery of the converter is for some CLD analysers optional.

Some CLD analysers have an integrated ozone generator; others need an external ozone generator. The CLD measuring principle is often used for analysis of NO_X by accredited measurements as well as within research and development. The CLD measuring principle is often much more expensive than the IR and UV measurement of NO_X.

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