Chapter 5
Maintaining a Cold On-Column Injector Direct Narrow-Bore
Cold On-Column Injector Maintenance
This injector will normally be serviced by Thermo Fisher Scientific authorized
technical personnel and do not require periodic maintenance. The PTFE seal of
the rotary valve, if worn, can be replaced by the user.
Possible leaks in the rotary valve
Some symptoms, particularly a low reproducibility in results, may indicate that
the connection between the rotary valve and the relevant PTFE seal is not in good
condition. Refer to Chapter 19,
To eliminate possible leaks on the rotary valve, tighten the Allen screws that fix
the upper and the lower parts of the injector, then test the injector to see if the
symptom has disappeared. If not, replace the seal of the rotary valve, as explained
in the
100
Replace the Rotary Valve Seal
Analytical Troubleshooting
Operating Sequence on page 101.
Maintenance and Troubleshooting Manual
Cold On-Column Injector Maintenance
for more information.