What is your methodology for troubleshooting process analyzer problems?

Analyzer troubleshooting methodology: (1) Define problem - gather symptoms, recent changes, alarm history, (2) Verify with independent measurement - grab sample, portable analyzer, (3) Check sample system - flow, pressure, temperature, filter condition, (4) Verify calibration - run zero and span check, (5) Check analyzer components - detector, optics, electronics, (6) Review maintenance history - recent work, component age, (7) Systematic substitution - replace suspected components, (8) Document findings and corrective actions. Use manufacturer diagnostics, compare to known-good conditions. Consider: environmental factors, process changes, and intermittent issues may require trending data. Maintain troubleshooting guides for common issues.