Yokogawa GC — Chromatogram Reference
Typical chromatogram appearance for Yokogawa process gas chromatographs. Used for troubleshooting sampling, valves, oven stability, and carrier gas issues.
Important: Peak order, retention time, and response vary by method.
This reference is for pattern recognition only, not calibration.
Typical Stable Chromatogram
A healthy GC chromatogram shows:
- Stable baseline (no drift or noise)
- Consistent retention times
- Sharp, symmetrical peaks
- Repeatable peak area between runs
Schematic reference (zoomable)
Common Fault Patterns
Baseline Noise / Drift
- Wet sample or condensation
- Carrier pressure hunting
- Detector instability
Retention Time Shift
- Oven temperature deviation
- Carrier flow change
- Column ageing
Missing / Low Peaks
- Injection valve fault
- Sample loop blockage
- Incorrect valve timing
Peak Tailing / Broadening
- Column contamination
- Moisture ingress
- Valve leakage
Schematic — Baseline Noise
Schematic — Retention Time Shift
Schematic — Peak Tailing
Schematic — Missing Peaks
Technician tip:
Always compare chromatograms only after confirming
stable sample pressure, dry sample, and stable carrier gas.