Issues regarding micro-oxygen 0-10PPm analysis instruments
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Regarding the calibration of micro-oxygen analyzers, when calibrating the zero point of these instruments, people usually use high-purity nitrogen with several 9s in its purity level; we use nitrogen with a purity of ≥99.992% from Beifen – I’m not sure if that will work. Please help analyze it. Thank you!
If it’s nitrogen with 4 nines, what is the oxygen content in PPm? How to calibrate zero?
PPM means one in ten thousand. Four 9s will do. Of course, you can also ask for more.
It probably won’t work; that would be 80 ppm, which is already at the full scale
At least 6 nines, 9,99.9999% nitrogen, corresponding to 1 ppm, can be used as a zero gas
Yes. I mistook my words. My intention was 0.01 percent, because the original poster was talking about a number with several 9s, and there was a percent sign after it.
Use pure nitrogen directly, but before it reaches the oxygen detector, it’s necessary to remove any trace amounts of oxygen from the gas using a high-efficiency deoxygenizer. Using some other type of nitrogen with a high purity percentage is complete nonsense. This is not a technical issue; it’s a matter of practical experience. Those who talk about gases containing a certain number of 9s – what guarantees that the oxygen content in the zero-point gas is low enough? And then there are those who talk about 4 nines – 99.99% nitrogen. How can it be ensured that the residual oxygen level is below 1 ppm or even lower? The impurity levels of nitrogen and oxygen in such cases can be as high as several dozen ppm; can such gas be used as zero-point gas? Saying such things is not a problem with intelligence; it’s a problem with competence. Why doesn’t the original poster ask the people in the laboratory who work with chromatography, especially those in positions using ECD detectors? They would be able to explain it right away if asked.
Some people talk nonsense. For the zero gas of a trace oxygen analyzer, the key is to remove any residual trace oxygen from this zero gas, rather than choosing a background gas with a certain level of oxygen concentration. Some idiots just know how to talk nonsense; they have no idea what the concept of oxygen zero-point gas is. Furthermore, for zirconia oxygen analyzers, an oxygen-free zero gas cannot be used for calibrating the range.