Thermo Scientific FOCUS GC, Instruction Manual

Page: 276 / 356

Chapter 15
Maintenance and Troubleshooting
Maintaining a PPKD Injector
276 Instruction Manual
Maintaining a PPKD Injector
The Purged Packed Column injector and its interface module will normally be
serviced by Thermo Fisher Scientific authorized technical personnel.
In order to operate at peak performances, the injector requires periodic
maintenance from the user. This maintenance includes:
• the replacement of the septum
• the cleaning or replacement of the liner.
When replacing the septum
The septum must be replaced at least every 200 injections, or every time a
problem occurs related to a septum damage or wear.
It is good practice to replace the septum every time the liner is replaced.
When replacing the liner
The liner must be replaced periodically, depending on the number of injections
performed and on the characteristics of the samples injected. The most common
symptom indicating that the liner should be replaced is the appearance of tailing
peaks in the chromatogram, particularly for polar compounds.
You can replace the liner with a new one or clean the liner and reinstall it.
Every time the liner is replaced, it is a good practice to replace the septum too.
The following Operating sequences help you to maintain properly the PPKD
injector:
• Replace the PPKD Septum
• Replace or Clean the PPKD Liner