The ABB AO2000 LS25 is a state-of-the-art in-situ tunable diode laser (TDL) oxygen analyzer designed for direct, real-time measurement of oxygen (O₂) concentration in high-temperature, corrosive, or particulate-laden process gases—without the need for extractive sampling systems. As part of ABB’s renowned AO2000 advanced gas analysis platform, the LS25 variant leverages laser absorption spectroscopy to deliver highly selective, drift-free O₂ readings in applications such as boiler combustion control, cement kilns, steel reheating furnaces, and waste incineration.
Unlike traditional zirconia or paramagnetic analyzers that require gas extraction, filtration, and conditioning, the ABB AO2000 LS25 mounts directly onto the process duct or stack via a flanged probe. The laser beam traverses the gas stream across the pipe diameter, measuring O₂ based on its unique absorption at a specific near-infrared wavelength. This cross-duct configuration eliminates sampling delays, reduces maintenance, and avoids errors caused by condensation, clogging, or chemical interference. With a measurement range typically from 0–25% O₂ (configurable), response times under 1 second, and operation in flue gases up to 1800°C (3272°F), the AO2000 LS25 enables precise air-fuel ratio control—optimizing combustion efficiency, lowering NOₓ/CO emissions, and reducing fuel consumption by 2–5%.
Engineered for rugged industrial use, the AO2000 LS25 features a robust stainless-steel probe, purge air system to keep optics clean, and optional air/water cooling for extreme environments. It complies with global safety standards (ATEX, IECEx, CSA) and integrates seamlessly into DCS/PLC systems via 4–20 mA, Modbus, or HART outputs. Trusted in power generation, metals, glass, and chemical plants worldwide, the ABB AO2000 LS25 represents the gold standard in maintenance-free, in-situ oxygen analytics.
Technical Specifications
| Parameter | Value |
|---|---|
| Model | ABB AO2000 LS25 |
| Manufacturer | ABB Automation Products / Measurement & Analytics |
| Measurement Principle | Tunable Diode Laser Absorption Spectroscopy (TDLAS) |
| Measured Gas | Oxygen (O₂) |
| Typical Range | 0–5%, 0–10%, 0–25% O₂ (user-configurable) |
| Accuracy | ±1% of reading or ±0.1% O₂ (whichever is greater) |
| Response Time (T90) | < 1 second |
| Process Temperature | Up to 1800°C (with cooling jacket) |
| Process Pressure | -50 to +500 mbar (standard); higher with options |
| Probe Material | 316L SS, Inconel 600/601 (high-temp option) |
| Outputs | 4–20 mA (isolated), RS485 (Modbus RTU), HART (optional) |
| Purge Air Requirement | Clean, dry instrument air (3–6 bar, ~5 Nm³/h) |
| Certifications | ATEX, IECEx, CSA, CE, EMC compliant |
| Mounting | Flanged (DN65/PN16 or custom), cross-duct installation |
Main Features and Advantages
✅ True In-Situ Measurement: No sample extraction = no pumps, filters, or conditioning—eliminating maintenance and failure points.
✅ Unmatched Selectivity: Laser targets only O₂—immune to cross-interference from CO, CO₂, H₂O, or dust.
✅ Extreme Environment Operation: Functions reliably in hot, wet, or abrasive flue gases where extractive systems fail.
✅ Fast Response for Dynamic Control: Sub-second updates enable real-time combustion tuning during load changes.
✅ Low Lifetime Cost: Minimal consumables; only periodic purge air and occasional window cleaning required.
✅ High Availability: Built-in diagnostics monitor laser health, signal strength, and window fouling—alerting before failures occur.
Application Field
- Power Generation: Optimizing coal, biomass, or gas-fired boiler efficiency and emissions compliance.
- Cement Manufacturing: Controlling calciner and kiln atmosphere to reduce fuel use and clinker quality variation.
- Steel & Metal Processing: Monitoring reheat furnaces, annealing lines, and ladle metallurgy for precise O₂ control.
- Waste-to-Energy: Ensuring complete combustion in incinerators while minimizing dioxin formation.
- Glass Production: Managing oxy-fuel or air-fuel melters for energy savings and NOₓ reduction.
- Chemical & Petrochemical: Monitoring inertization or oxidation processes in reactors and flares.
Related Products
- ABB AO2000 LS27: Dual-laser version for simultaneous O₂ + CO or O₂ + CH₄ measurement.
- ABB Magnos206: Extractive paramagnetic O₂ analyzer—alternative for clean, low-temp applications.
- ABB Uras26: Extractive infrared analyzer for CO, CO₂, SO₂—often used alongside LS25 in CEMS.
- ABB LCP200: Local control panel for AO2000 series with display and configuration interface.
- Purge Air Filter Kits: Coalescing + particulate filters to protect LS25 optics in dirty plant air.
- Cooling Jackets: Water- or air-cooled adapters for installations above 800°C.
Installation and Maintenance
Installation Best Practices:
- Install probe after last heat recovery surface (e.g., economizer) but before SCR/FGD to avoid condensation.
- Ensure adequate straight pipe runs (5D upstream, 2D downstream) for representative gas flow.
- Align transmitter and receiver units precisely using ABB’s alignment tool—critical for signal strength.
- Connect clean, dry purge air to prevent ash buildup on optical windows; install pressure regulator and filter.
Maintenance Recommendations:
- Inspect optical windows quarterly (or based on process fouling rate); clean with soft cloth and isopropyl alcohol if needed.
- Monitor transmission signal strength via HMI—if below 20%, check alignment or window cleanliness.
- Verify calibration annually using zero/span gases or cross-check with portable analyzer (though TDL requires minimal calibration).
- Replace purge air filters every 6–12 months depending on plant air quality.
