After repairing an Agilent chromatograph, you need to perform the following performance verification steps to put it back into experimental use:

1. Conduct targeted re-certification based on the repair scope: For minor repairs (e.g., replacing pump seals), carry out specific checks such as flow rate accuracy and pressure stability of the pump; for major repairs, follow appropriate qualification procedures (e.g., using the 4Q model for GxP-compliant laboratories) to ensure the instrument meets operational requirements.
2. Verify key performance indicators: Check critical parameters including baseline noise, retention time consistency, and injection precision (by comparing chromatograms of standard samples before and after repair to confirm performance stability).
3. Ensure compliance with relevant regulations: For laboratories under regulatory frameworks like GxP, confirm that the verification process aligns with regulatory standards to guarantee data reliability.

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