Which online laser gas analyzer should be chosen for measuring trace amounts of water?
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In the gas phase, the background gas is fluorinated olefins; the water content is around 30-50 ppm, with a measurement range of 0-1000 ppm. Can a laser-based method detect such low levels? Existing manufacturers: Focus Technology, Anhui Wanyi, Micrel, Polish Airoptic, Shanghai Changai – I’m not sure which one to choose. I would like to ask the experts here for their guidance
The range you have specified should work fine using laser gas analysis methods, but if the sample concentration is mainly in the 30–50 ppm range, the laser method may present certain difficulties. Consult Michel and Shaw’s, as well as GE; they have specialized instruments for analyzing trace amounts of water in gases, and these instruments are widely used. If Fourier-transform near-infrared spectroscopy can be used along with a larger path-length absorption cell, it might also work.
Laser absorption spectroscopy can be used to determine moisture content; it works well for low concentration levels as well, but the price is a bit high. There are other methods for online determination of moisture, and the actual circumstances should be taken into consideration.
Thank you for your valuable advice. The laser method is indeed expensive, but due to our constraints, we can only use it.