An analytical chemistry intern is troubleshooting a significant air leak, registering 15.8% O2, on their lab's Agilent gas chromatography-mass spectrometry system and is seeking community advice.

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    "summary": "An analytical chemistry intern is troubleshooting a significant air leak, registering 15.8% O2, on their lab's Agilent gas chromatography-mass spectrometry system and is seeking community advice.",
    "category": "reliability",
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      {
        "url": "https://www.reddit.com/r/massspectrometry/comments/1whsvuv/comment/pa4v93x/",
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        "author": "RTI-Gear",
        "excerpt": "Go to tune window and select manual tune. Then on profile, monitor for mass 69 (pftba base peak), 51 (difluroethane base peak), 28 (nitrogen from air must be below 10% if I recall correctly). Then, using dust off with a straw star spraying in all areas you suspect leaks might be present:\n\n Transfer line fitting\n\n Analyzer door manifold\n\n Inlet column fitting (spay and wait like a minute or two to",
        "posted_at": "2026-09-16T10:25:54.000Z",
        "author_url": "https://www.reddit.com/user/RTI-Gear/"
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        "url": "https://www.reddit.com/r/massspectrometry/comments/1whsvuv/comment/pa56bpm/",
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        "author": "chemfit",
        "excerpt": "What did you do just prior to the leak? If you did some sort of maintenance, check that area first.\n\n If I came onsite to look at this the first thing I’m doing is using a leak detector at any carrier gas fittings post filter if you have one, inlet both and CFT.\n\n Then I’m changing the inlet septa assuming you have the type of transfer line that goes through the inlet septa. If you have a volatile",
        "posted_at": "2026-09-16T11:38:57.000Z",
        "author_url": "https://www.reddit.com/user/chemfit/"
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      {
        "url": "https://www.reddit.com/r/massspectrometry/comments/1whsvuv/comment/pa7h8vz/",
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        "author": "Nikethamid26",
        "excerpt": "Our lab uses a bottle of Argon for leak testing. Monitoring mass 40 and doing a similar procedure as described by u/RTI-Gear.",
        "posted_at": "2026-09-16T17:51:36.000Z",
        "author_url": "https://www.reddit.com/user/Nikethamid26/"
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      "[post] Hi everyone, I'm an analytical chemistry intern currently troubleshooting a significant air leak on our lab's Agilent system and could use some advice from experienced chromatographers.",
      "[post] System Setup:\n\nGC: Agilent 7890B\n\nMSD: 5977 MSD\n\nSampler: 7697A Headspace sampler",
      "[post] Our system is registering a massive atmospheric leak showing around 15.8% O2."
    ],
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    "post_date": "2026-09-16T09:59:43.000Z",
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    "post_text": "System Setup:\n\nGC: Agilent 7890B\n\nMSD: 5977 MSD\n\nSampler: 7697A Headspace sampler\n\nCurrent Status: System is fully cooled down (< 35 °C) with carrier gas flow active to protect the column.\n\nThe Problem:\n\nOur system is registering a massive atmospheric leak showing around 15.8% O2.\n\nWhat we've checked/done so far:\n\nChecked and slightly torqued the column nuts at the back SSL inlet and the CFT (Capillary Flow Technology) splitter plate.\n\nChecked the headspace transfer line connection interface.\n\nConsidering using a duster spray with MassHunter to pinpoint the exact leak, but wanted to ask for advice from anyone who has chased down severe air leaks on a similar HS-GC-MSD setup.\n\nAre there any hidden or common leak points on a 7890B / 7697A setup that I might be overlooking (like O-rings, transfer line ferrules, or pneumatic modules)? Any tips for a newcomer would be hugely appreciated.",
    "sentiment": "negative",
    "subreddit": "massspectrometry",
    "event_date": "2026-09",
    "post_title": "Hi everyone, I'm an analytical chemistry intern currently troubleshooting a significant air leak on our lab's Agilent system and could use some advice from experienced chromatographers.",
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