5. Take a beaker or other glass container and place it underneath the inlet. Rinse the inlet with
a small amount of clean solvent several times. Use a laboratory pipette or a syringe. Only the
inlet bore should be rinsed. Avoid solvent on the other parts of the inlet.
6. Wait until the inlet is dry. Insert a clean empty liner in the inlet, screw the top boss on and
connect your regular column to the inlet bottom.
7. Enter the following standby parameters in the Evolution Workstation software by selecting
Configuration - Standby:
• Split valve state: Split
• Inlet temperature: 450 °C
• Column flow: as low as possible
• Split flow: 200 mL/min
Activate these parameters and purge the inlet for 30 minutes.
8. Test the system to see if the carryover has disappeared.
9. If carryover is still present, repeat steps 1 to 7.
10. If carryover is still present contact your supplier.
11.3 Carrier Gas Leak Check
A gas leak in a GC system affects reproducibility and increases consumption of the carrier gas. To
check for carrier gas leaks, use an electronic leak detector (GL Sciences p/no 2702-19340 or similar
commercial detector).
To facilitate the search for a leak, follow the procedure below:
1. Set OPTIC-4 into standby mode.
2. Wait until GC oven and inlet temperature is below 40 °C.
3. Remove the capillary column from the inlet and blank the inlet with a no-hole graphite
ferrule (2406-1019, OPTIC Graphite Ferrule, no-hole, pk/10).
4. Ensure that the carrier gas supply pressure is set to 700 kPa.
5. Duct the carrier exhaust ports “Exhaust” and “SP Exhaust” away from the “Inlet Gas Lines”
connection. Use short pieces of 1/8 in. PTFE tubing for this.
6. Select in Evolution Workstation Configuration/System Configuration. Set column
parameters to: Internal Diameter - 0.25 mm, Length – 30 m.
7. Select in Evolution Workstation Configuration/Standby Parameters. Set standby column
flow to 20 mL/min and standby split flow to 200 mL/min.
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