Yokogawa – Alarm Decision Trees

Step-by-step alarm troubleshooting flows written for analyzer technicians. Follow in sequence — fix sampling & utilities before electronics.

Golden rule: If readings are unstable, drifting, or wrong — check sample condition, pressure/flow, purge/reference air before calibration or parts replacement.

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ZR22G – Zirconia O₂ Analyzer

Heater issues, drift, calibration failures, no response.

Calibration Failure → Analyzer Page →

OX400 – Sampled-Gas O₂ Analyzer

Model-specific documentation notes for unstable readings, calibration and outputs.

Unstable Reading → Analyzer Page →

GC8000 – Process Gas Chromatograph

Carrier pressure, oven readiness, valve switching, detector faults.

Carrier Pressure Low → Analyzer Page →

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Technical references

Updated against manufacturer documentation. Match the document to the installed model and options.

Yokogawa: OX400 Low Concentration Zirconia Oxygen Analyzer — GS 11M10B01-01E, 3rd edition, March 2011; amended pages June 2017.