Ozone Analyzer – Interference-Free UV Absorption (FEM): Model 211 | 2.B Tech

The Model 211 Scrubberless Ozone Monitor is a reference-grade analyzer designed for high-accuracy ambient ozone measurements, even in heavily polluted environments. Utilizing UV absorption at 254 nm combined with a patented gas-phase scrubber technology, it eliminates interferences from VOCs, mercury, and particulates.

Recognized as a Federal Equivalent Method (FEM), the Model 211 ensures regulatory compliance while delivering unmatched precision and stability. Its dual-beam optical design and extended optical path length provide sub-ppb sensitivity, making it one of the most accurate ozone monitors available on the market.

Advantages

• Interference-free measurement using patented gas-phase NO scrubber technology
• FEM-certified analyzer for regulatory and compliance monitoring
• Ultra-high precision (< 0.5 ppb) with dual-beam optical system
• Excellent stability with minimal drift over time
• Integrated data logging with SD card for long-term monitoring
• Flexible operation with multiple averaging times (2 s to 1 hr)
• Safe operation using non-toxic N₂O cartridges to generate NO

Key Features

• Measurement principle: UV absorption at 254 nm, dual beam
• Measurement range: 0 – 2,000 ppb (0 – 2 ppm)
• Resolution: 0.1 ppb
• Precision: ≥ 0.5 ppb or 1% of reading
• Accuracy: ≥ 1 ppb or 2% of reading
• Detection limit: 1.0 ppb
• Response time: 4 s (fast mode), 20 s (averaged)
• Flow rate: ~2 L/min
• Operating temperature: 10 to 50°C
• Outputs: RS232, analog (0–2.5 V), SD card, LCD
• Data logging: internal + SD card (>5 years capacity)
• Calibration: NIST-traceable

Typical Applications

• Ambient air quality monitoring networks
• Regulatory compliance (EPA / FEM monitoring)
• Urban and industrial pollution studies
• Environmental research and atmospheric chemistry
• Mobile and fixed air monitoring stations

Additional Information

The Model 211 incorporates an innovative gas-phase titration (GPT) system using nitric oxide (NO) to eliminate ozone during reference measurements, avoiding the limitations of traditional solid scrubbers. This ensures true interference-free ozone quantification, even in environments containing aromatic compounds or mercury.

Its DewLine™ system further enhances measurement reliability by removing water vapor interference, a critical factor in ambient air monitoring. The instrument is delivered in a 19” rack-mount enclosure, making it ideal for integration into monitoring stations and laboratory setups.

Designed for long-term operation, the Model 211 includes a long-life internal pump (20,000 hours), advanced data management capabilities, and multiple communication interfaces for seamless integration into existing monitoring infrastructures.