Troubleshooting & Procedures
Field-focused guidance for high-accuracy combustion and emissions O₂ measurement. Use diagnostics + trending to catch problems early.
Overview
The ABB AZ40 is the premium AZ-series model with full diagnostics and fast response. In most real failures, the root cause is still external: sample condition, leaks, plugging/restrictions, heater instability, or reference path issues.
Best practice: Trend O₂ value, sensor temperature, heater power, and any “quality/status” flags
instead of relying only on alarms.
Calibration
1) Confirm stable probe/sensor temperature (no oscillation).
2) Verify sample path: no leaks, no blockage, good flow/aspiration.
3) Run zero and span with adequate stabilization time.
4) Verify reference checks (air/reference) as per manual.
5) Confirm diagnostics/health status after calibration.
Warning: If span or drift fails, do not keep recalibrating.
Fix moisture ingress, leaks, restrictions, or pressure instability first.
Maintenance
- Inspect probe tip / filter condition and clean per site practice
- Check heater & temperature stability trends
- Inspect cables, grounding, and cabinet environment (heat/dust/moisture)
- Verify reference path is clean, dry, and not restricted
- After any work: leak test and verify response with a check gas
Common Alarms
All ABB AZ-series alarms (AZ10 / AZ20 / AZ25 / AZ30 / AZ40) are in the shared alarms folder.