Gas chromatography failure to ignite
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Our unit’s gas chromatograph has developed a problem: after hydrogen is used for ignition, the flame goes out automatically after a short while. Please help – anyone who has encountered a similar situation? Thank you first.
There are two possibilities: either the temperature of the hydrogen flame detector is below 100 degrees, or the ratio of hydrogen to air is incorrect. Please measure again; it’s possible that there is a leak in that area
At the critical moment, turn off the air supply, increase the hydrogen flow, then ignite it. Once it’s lit, gradually increase the air supply while reducing the hydrogen flow. Once, a colleague couldn’t get a flame to start; they tried using a lighter, but it just wouldn’t work. And you know what happened? They used the sample inlet as if it were a flame source, so of course it didn’t work.
Our chromatograph has automatic ignition
When igniting, the proportion of hydrogen should be slightly higher
Also, check whether there is carbon buildup in the FID and clean it first.
It could be due to excessive tail gas flow
It may be caused by an excessive nitrogen flow rate or too low a hydrogen flow rate, or it could also be due to insufficient air volume.
Reply to 6# E Road With You: The detector has been cleaned; it was fine for two or three days, but now it’s back to its old state.
It is usually due to an excessive air flow rate
It’s possible that the temperature of the detector is below 100 degrees; the water produced by the combustion of hydrogen does not evaporate and instead remains as water droplets inside the detector, which is why the situation you described occurs