INFICON Explorer Portable Gas Chromatograph - Manual (Page 270)

Maintenance and Troubleshooting
268
Chromatographic Troubleshooting
Problem: No peaks appear
Cause: Improper method settings.
Action: Ensure the correct Method is loaded or check that the foreflush duration is
long enough to allow the sample to fill the loop and clear the precolumn before
backflush begins.
Cause: Leak in the injection port.
Action: Replace the injection port septum as described in Replacing the
Injection Port Septum on page 248.
Cause: If syringe injection is being used, the syringe needle may be blocked.
Action: If the syringe plunger does not move smoothly this is an indication that the
needle is blocked. Use the fine wire supplied with the syringe to clean the needle or
replace the needle.
Cause: The sample was injected onto the wrong column.
Action: Ensure you have selected the correct column for your application.
Cause: No sample at sample in port.
Action: If you are using a gas bag, ensure the gas bag valve is open.
Cause: Sample inlet filter is blocked.
Action: Replace the sample inlet filter as described in Replacing the Sample
Inlet Filter on page
242.
Cause: The filter in the telescoping sample probe is blocked.
Action: Replace the filter in the telescoping sample probe, as described in
Replacing the Filter on page
45.