When repairing the inlet seal pad aging issue of Agilent 7820A gas chromatograph, the following points should be noted:

1. Safety priority: Ensure the instrument is not in analysis state. Turn off the inlet, column oven and detector, and wait for the inlet to cool down to a safe temperature before operation (do not remove components while the instrument is working to avoid risks).
2. Preparatory measures: If the column front pressure is high, properly reduce it to lower operational risks during replacement.
3. Component selection: Use the correct type of inlet seal pad matching Agilent 7820A specifications; deactivated pads are recommended if needed to minimize contamination.
4. Service life management: Replace the seal pad promptly when the number of injections exceeds 100 times to prevent aging-induced leakage.

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