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PN 074-519-P1C
3000 Micro GC Operating Manual
9.2.1.3 Peak Symptoms
9.2.1.3.1 No Peaks
Possibilities include operator error, insufficient Sample Pump time, low Detector
Sensitivity setting (peaks are present but not visible) or insufficient Inject Time.
Check the 3000 Micro GC analytical and reference vent flow. No flow could
indicate a broken column. The presence of flow could indicate an injector or TCD
malfunction. Contact INFICON.
9.2.1.3.2 Inverted Peaks
Inverted peaks are usually caused by poor quality carrier gas. The carrier gas must
be 99.995% to 99.9995% pure. Inverted peaks may indicate that the carrier gas is
contaminated, or that the incorrect carrier gas is being used, or it is configured
improperly.
Carrier gas configuration can be checked on the 3000 Micro GC embedded web
page. Refer to section 6.1.1 on page 6-1. If the carrier gas is configured incorrectly,
correct it by following the procedure outlined in section 6.4 on page 6-9. Refer to
section 4.1.5 on page 4-3 for carrier gas requirements.
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