Chromatographic Symptoms 3
Agilent 7890 Series Troubleshooting 73
FID Baseline Output at Maximum (~8 Million)
If the FID output seems to be stuck at a very high value (up to 8
million counts), check for a shorted collector.
1 Check if the interconnect spring has been bent. Remove the
collector assembly and visually inspect the spring.
2 Disassemble the collector assembly and visually check for
rust buildup on any parts. Replace parts as needed. To avoid
this problem, operate the detector at >300 °C.
3 Check for carbonization in the detector due to injection or
aromatic or chlorinated solvents. To avoid this problem,
operate the detector at >300 °C. Reassemble and install the
collector and operate the detector using higher air and
hydrogen flows (air must be 450 mL/min, hydrogen at 35
mL/min).
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