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Model 202 Ozone Monitor

2B Tech’s original single channel EPA-certified Federal Equivalent Method (FEM) ozone monitor. The Model 202 was first manufactured in 2002 and features real-time ozone measurements produced every 10 seconds. Robust and versatile ozone monitor used for a variety of ambient ozone monitoring applications.

  • 0-250 ppm with 1.5 ppb precision
  • EPA-certified FEM (EQOA-0410-190)
  • Highly portable, low power, benchtop ozone monitor


  • FEM single beam (UV-based) ozone analyzer; accurate and precise ozone measurements
  • Lightweight with low power consumption and a quiet, long-life internal air pump
  • Applications include ambient monitoring in remote locations where power is limited; vertical atmospheric profiling; urban arrays of ground-based ozone monitors; personal exposure monitoring; laboratory studies
  • Ozone measured 0-250 ppm by UV absorption at 254 nm, single beam
  • Quiet long-life internal air pump (now standard)
  • Low power consumption (~7.2 watt)
  • Internal data logger (EEPROM), logs 16,383 lines of data
  • Real-time clock
  • Both serial and user-scalable analog voltage outputs (4-20 mA current output optional)
  • Flash card memory (SD card) for virtually unlimited, portable data storage
  • Three 0-2.5 VDC analog inputs for logging other measurements, such as external temperature, pressure, and humidity
  • Convenient user interface to microprocessor, including calibration parameters (gain and zero)
  • Selectable measurement time of 10 s or data averaging times of 1 min, 5 min and 1 hr (custom averaging times available)
  • DewLine™ for elimination of any water vapor interference, a unique feature of 2B Tech instruments
  • Model 202 Ozone Monitor
  • 1.25A power adapter
  • Serial port cable (9PinF-9PinF)
  • External ozone scrubber
  • SD card reader
  • Hex ball driver (7/64″)
  • USB flash drive preloaded with operation manual and other useful documentation
  • NIST-traceable calibration certificate
  • External lithium-ion battery available (not included with standard purchase)
  • External particle filter
  • Cold-weather upgrade (-20 to 50°C) (temporarily unavailable)
  • High-altitude upgrade (25km)
  • 4-20mA analog out upgrade
  • GPS upgrade
  • Bluetooth upgrade for wireless data transmission
  • Lower-power option
  • Extra-long-life pump
  • Serial-to-USB converter (not included with standard purchase)
  • Rack-mount configuration upgrade available
  • Ambient Size-Segregated Particulate Matter Characterization from a Port in Upstate New York, O.D. Moyebi, B.P. Frank, S. Tang, G. LaDuke, D.O. Carpenter and H.A. Khwaja, Atmosphere (2022) 13, 6, 984. MDPILink
  • Rate of Atmospheric Brown Carbon Whitening Governed by Environmental Conditions, E.G. Schnitzler, N.G.A. Gerrebos, T.S. Carter, Y. Huang, C.L. Heald, A.K. Bertram and J.P.D. Abbatt, Proceedings of the National Academy of Sciences (2022) 119, 38, e2205610119. PNAS Link
  • Sugarcane Responses to Elevated Ozone, B.B. Moura, Y. Hoshika, R.V. Ribeiro and E. Paoletti, 2002 IEEE Workshop on Metrology for Agriculture and Forestry (2022), pp. 169-173, doi:10.1109/MetroAgriFor55389.2022.9965040.  IEEE Link
  • Chemical Composition of Gas and Particle Phase Products of Toluene Photooxidation Reaction under High OH Exposure Condition, Y.-S. Lau, M.-N. Chan, H.-Y. Poon, Y. Tan, S.-C. Lee, J. Li and K.-F. Ho, Atmosphere (2021) 12, 915.  MDPI Link
  • Air Quality Observations in the East of Quito, Ecuador in 2018-2020: Comparisons between Pre- and Post-COVID-19 Conditions, M. Cazorla, in WIT Transactions on Ecology and the Environment (2021)252, pp. 177-185. OnlineLink


Spec Sheet
Measurement Principle UV Absorption at 254 nm, single beam
Federal Equivalent Method (FEM) Yes, 0-500 ppb for 10-40°C: EQOA-0410-190
Linear Dynamic Range 0 to 250 ppm
Resolution 0.1 ppb
Precision (1σ; rms noise) Greater of 1.5 ppb or 2% of reading
Accuracy Greater of 1.5 ppb or 2% of reading
Limit of Detection (2σ) 3.0 ppb (in 10-s measurement mode)
NIST-Traceable Calibration Yes
Measurement Interval 10 s (Data averaging options: 1 min, 5 min, 1 hr)
Flow Rate (nominal) ~1 Liter/min
Flow Rate Requirement >0.6 L/min
Baseline Drift < 2 ppb/day
< 5 ppb/year
Sensitivity Drift < 1%/day
< 3%/year
Measurement Time, Frequency 10 s, 0.1 Hz
Response Time, 100% of Step Change 20 s, 2 points
Averaging Times 1 min, 5 min, 1 hr
Internal Data Logger Capacity 16,383 lines (10-s meas. = 1.9 days; 1-min avg = 11 days; 5-min avg = 1.9 mo;
1-hr avg = 1.9 yr)
SD Card Logger Capacity Minimum 2 GB (> 5-year capacity for 10-s measurement mode)
Ozone Units ppb, ppm, pphm, µg m-3, mg m-3
Pressure Units mbar, torr
Temperature Units °C, K
T and P Corrected Yes
Operating Temperature Range 0 to 50 °C standard; optional -20 to 50 °C with low temperature modifications (pump and lamp heater cold-weather package)
Operating Altitude Range ~0-13.5 km (150-1,013 mbar) standard; optional ~0-25 km (30-1,013 mbar) with upgraded pressure sensor
Power Requirement;
Supplied by battery or 110/220 VAC Power Pack
11-14 V DC or 120/240 V AC, 600 mA, 7.2 watt (6.2 watt with cell heater unplugged)
Size 3.7H x 8.5W x 11.8L inches (9.5 x 21.5 x 30 cm)
Weight 5.5 lb (2.5 kg); 2.8 lb (1.3 kg) without instrument case
Analog Inputs for Internal Logging of Other Instruments 3 Analog Inputs, 0-2.5 V; For example could log external T, P and RH
Data Outputs RS232, 0-2.5 V Analog, LCD Display: (Optional 4-20 mA Analog Current output; request quote)
Data Transfer Baud Rates 2400, 4800, 19200
Output Ranges User-Defined Scaling Factor in Menu
DewLine™ Yes
Quiet Long-Life Internal Air Pump Yes
Flow Meter Yes
Options Battery; External Particle Filter; Serial-to-USB Converter; GPS (for 10-s data mode and above); Bluetooth; 4-20 mA Current Output; Cold-Weather Package, -20 to 50°C (pump, lamp heater); High-Altitude Upgrade (25 km); Extra-Long-Life Internal Air Pump; Lower-Power Option; Rack-Mount Case Configuration
Upgradable to Model 205 Dual Beam Yes


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Case Studies

Case Studies for this product are coming soon!
"My research team uses five 2B Technologies Model 202 and 205 ozone analyzers and a Model 306 ozone calibration source. These instruments have been central to my research program on indoor ozone chemistry. They are easy to use, robust, and have required little maintenance over several years."
Richard L. Corsi

Professor of Civil, Architectural and Environmental Engineering, The University of Texas

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