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