Negative Peaks Seen With Tcd - Agilent Technologies 7890 Series Troubleshooting Manual

3
Chromatographic Symptoms

Negative Peaks Seen with TCD

86
• Verify that the correct gas type is being used.
• Check for a leak in the system, especially at the detector
column fitting. (See
• Consider thermal conductivity of analytes relative to carrier.
• Check the flow settings, then measure the actual detector
flows. (See "To Measure a Detector
"Checking for Leaks".)
Flow".)
Agilent 7890 Series Troubleshooting