Product Category
Combustion Oxygen and Carbon Monoxide Equivalent Analyzer
Product Overview
The ABB Endura AZ40 is a close-coupled combustion analyzer that continuously measures excess oxygen and unburned fuel in boiler, furnace and combustion exhaust gases.
Oxygen is measured using a zirconium-oxide cell, while unburned combustibles are detected by a catalytic sensor and reported as carbon monoxide equivalent—COe.
Simultaneous O₂ and COe measurement helps operators optimise the fuel-to-air ratio, reduce fuel consumption, identify burner problems and operate closer to the most efficient combustion point without creating unsafe conditions.
Main Components
- In-situ sampling probe and filter
- Heated sensor assembly
- Zirconium-oxide oxygen sensor
- Catalytic COe sensor
- Air-powered sample ejector
- Separate transmitter with colour display
- Automatic calibration-gas control
- Optional probe blowback system
Main Features
- Simultaneous O₂ and COe measurement
- Continuous extraction from the combustion process
- Heated sample path prevents acid condensation
- Primary and optional secondary probe filters
- Programmable filter blowback
- Automatic sensor calibration
- NAMUR NE107 diagnostics
- On-screen process trending
- SD-card data and configuration storage
- Six relay outputs
- Four isolated analogue outputs
- User-configurable digital I/O
- RS-485/Modbus communication
- Standard and high-temperature probes available
Technical Specifications
| Specification | Details |
|---|---|
| Oxygen measuring principle | Zirconium-oxide cell |
| COe measuring principle | High-sensitivity catalytic sensor |
| Minimum O₂ span | 0–5% |
| Maximum O₂ span | 0–25% |
| Minimum COe span | 0–500 ppm |
| Maximum COe span | 0–20,000 ppm/2% |
| Process-temperature measurement | Up to approximately 1,649°C |
| Transmitter ambient temperature | –20°C to +55°C |
| Sensor ambient temperature | –20°C to +70°C |
| Transmitter protection | IP55/NEMA 4 |
| Sensor protection | IP66/NEMA 4X |
| Analogue outputs | Four isolated, programmable 0–20 mA |
| Relay outputs | Six normally closed relays |
| Digital I/O | Two configurable inputs or outputs |
| Communication | RS-485/Modbus |
| Transmitter weight | Approximately 7.6 kg |
| Instrument-air supply | 350–700 kPa |
| Maximum installation altitude | 2,000 metres |
Probe Temperature Ratings
| Probe Arrangement | Maximum Process Temperature |
|---|---|
| Standard probe with primary filter | 649°C |
| Standard probe with primary and secondary filters | 816°C |
| 600 mm high-temperature probe | 1,650°C |
| 900 mm high-temperature probe | 1,370°C |
| 1,200 mm high-temperature probe | 1,232°C |
Final temperature suitability depends on the complete probe, filter and installation arrangement.
Marine and Offshore Applications
- Marine auxiliary boilers
- Oil-fired main boilers
- Exhaust-gas boilers
- Waste-heat recovery systems
- Incinerators
- Offshore process heaters
- FPSO boiler combustion systems
- Refinery furnaces
- Power-generation boilers
- Petrochemical heaters
- Burner-management optimisation
- Combustion troubleshooting and emissions reduction
Marine installation suitability and classification requirements must be confirmed for the selected configuration.
Operational Benefits
- Improves boiler combustion efficiency
- Reduces excess-air operation
- Helps lower fuel consumption
- Identifies incomplete combustion
- Detects burner or fuel-distribution problems
- Reduces carbon monoxide emissions
- Supports safer fuel-to-air ratio control
- Provides early warning of deteriorating combustion
- Reduces probe maintenance through automatic blowback
