Help needed~~
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Hello, everyone! ! I’m new here. Recently, I encountered a malfunction while using the ABB PGC2000 for online chromatographic analysis, and I would like to ask everyone for their advice. (The image below cannot be included; please forgive this.) The main analysis focuses on the pure propylene component in the catalytic gas stream from refineries; the carrier gas is H2, and the analysis cycle is 240 seconds. 1. Fault symptoms: hardware zero point at 1.5%, software zero point at 1.9 mv. The baseline remains stable throughout the cycle using the carrier gas (the column and detector are in good condition). When the sample gas was introduced, the baseline underwent changes at different stages: from 0 to 52 S, the baseline remained relatively stable; at 52 S, valve 2 opened and the baseline continued to rise until the next cycle. The peaks occurred at 124 S and 161 S, and the RT time was normal. The analysis results are basically the same as those of the tests. Inspection and troubleshooting: At first, it was thought that the valve was dirty; after cleaning it, the problem persisted, so it was suspected that the valve had a delay in returning to zero. An automatic zero-return function was added at 53S in the procedure sheet, but the issue remained the same. 2. On the other instrument, with the zero point remaining unchanged and the analysis results staying the same, it often happens that the baseline moves to the far right side of the screen (as if the entire chromatogram has been enlarged). I hope experienced folks can give me some advice. Thank you! !
Why ask different ABB online chromatography service engineers? Such a very specific question is difficult to answer casually without experience in operating ABB online chromatography systems. I haven’t operated ABB’s chromatograph either, but you can refer to the information below. 1. What is the valve used for in the action at 52s? If the baseline keeps rising and it’s not due to valve contamination, could it be a problem with the column system connected to that valve? How about aging that pillar? Since it has no impact on the analysis results, this baseline drift is considered constant; it occurs only with valve switching every 52 seconds, and there are basically no electrical issues. 2. I don’t understand the essence of your question; your written description seems a bit unclear. Were the settings parameters of the spectrum modified without knowing how to operate it? How about restoring the parameters to their initial settings?