Regarding PP gas analysis issues
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Gentlemen, I’m encountering a strange issue right now. Our on-site personnel took samples from the PP pipelines; after analyzing the sampled gas using chromatography, no C-H peak was detected (the analysts conducted the tests several times). However, the values read by the analyzer cabinet on site (a Siemens infrared analyzer that has been calibrated) after testing the sample (the marker propylene) showed 0.04%. I have some doubts about this. Is there a problem with my analyzer, or is it something else? The difference between the two is quite large. Has anyone encountered this problem before?
I made a mistake; the value measured by infrared is 0.4%
I think you should learn about the physical and chemical properties of the product; I believe that detection errors may be caused by changes in the testing environment. One type is online with spatial sealing, while the other is for sampling; as for how sampling is carried out, could it lead to contamination of the sample by mixing with other substances? I don’t understand your manufacturing process; you should talk more about it
Powder conveying system? Under normal circumstances, the main components of the exhaust gas from the polypropylene powder conveying system are propylene, propane, hydrogen, ethylene (used in production), and other substances remaining from the upstream system; therefore, propylene alone cannot be used as a standard
It’s the Siemens U6F; take a sample of propane as well – it’s possible that the analyzer has mistakenly identified propane as propylene.