For the Agilent 7697A headspace sampler's injection needle blockage issue, you can refer to the following solutions: Possible causes: 1. Particulate matter or high boiling point impurities in the sample deposit inside the needle; 2. Residual substances solidify due to long-term non-use. Recommended troubleshooting steps:

1. Cool the GC inlet to a safe handling temperature and the GC oven to room temperature to avoid column damage, then turn off the carrier gas.
2. Use an appropriate solvent to repeatedly flush the injection needle to remove blockages.

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