Model 202 Ozone Analyzer

The Model 202 Ozone Monitor will give accurate and precise measurement in low ppb with a precision of ~1.5 ppb and read up to 250 ppm.  This Monitor uses UV light absorption at 254nm for ozone measurement.


The 2B Technologies Model 202 Ozone Monitor™ is designed to enable accurate and precise measurements of ozone ranging from low ppb (precision of ~1.5 ppb) up to 250,000 ppb (0-250 ppm) based on the well-established technique of absorption of UV light at 254 nm.  Flash card memory and a quiet, long-life internal air pump are now provided standard on the Model 202 Ozone Monitor.  The Model 202 Ozone Monitor™ is lightweight (5.5 lb., 2.5 kg.) and has a low power consumption (12V DC, 0.60 amp, 7.2 watt) relative to conventional instruments and is therefore well suited for applications such as:

  • Vertical profiling using balloons, kites, RPVs and light aircraft where space and weight are highly limited
  • Long-term monitoring at remote locations where power is highly limited
  • Urban arrays of ground-based detectors
  • Personal exposure monitoring for studies of health effects of air pollutants
  • Environmental health and safety monitoring
  • Laboratory studies of the effects of ozone exposure on materials and organisms


  • GPS for continuous logging of latitude, longitude, and altitude (for 10-s data mode and above)
  • Bluetooth for wireless data transmission
  • Rechargeable lithium-ion battery provides 12 hours of continuous operation
  • External particle filter
  • Serial-to-USB adapter
  • Cold-weather package (pump, lamp heater for use down to -20 degrees C)
  • High-altitude upgrade (pressure sensor for use up to 25 km altitude)
  • Low-power option
  • Extra-long-life internal air pump
  • 4-20 mA analog current output
  • Rack-mount case configuration

System Includes

  • Model 202 Ozone Monitor with quiet, long-life internal air pump
  • AC Power Adapter (100-240 VAC to 12 VDC) with Country-Specific Plug
  • Flash Card Memory for virtually unlimited data storage
  • SD Card
  • SD Card Reader
  • Cigarette Lighter Adapter
  • Zeroing Cartridge
  • Operation Manual on USB Stick
  • Calibration Data and NIST-Traceable Calibration Certificate
  • Instrument Birth Certificate
  • One-Year Warranty


Measurement Principle

UV Absorption at 254 nm

Federal Equivalent Method (FEM)

Yes, EQOA-0410-190

Linear Dynamic Range

0 to 250 ppm


0.1 ppb

Precision (1σ; rms noise)

Greater of 1.5 ppb or 2% of reading


Greater of 1.5 ppb or 2% of reading

Limit of Detection (2σ)

3.0 ppb (in 10-s measurement mode)

NIST-Traceable Calibration


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


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)


3.5 x 8.5 x 11 inches (9 x 21 x 29 cm)


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 Current, External USB Converter; request quote)

Data Transfer Baud Rates

2400, 4800, 19200

Output Ranges

User-Defined Scaling Factor in Menu



Quiet Long-Life Internal Air Pump


Flow Meter



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 (pump, lamp heater); High-Altitude Upgrade; Extra-Long-Life Internal Air Pump; Low-Power Option; Rack-Mount Case Configuration

Upgradable to Model 205 Dual Beam




We highly recommend replacing the filter frequently to prevent contamination of the flow path by particulate matter. 




Picture of Filter Housing: Product: FILTERHS


Model 202 Brochure

Model 202 Manual

More Information
Manufacturer 2B Technologies
Call For Price No
Gas Ozone (O3)
Range 0-250 ppm
Resolution 0.1 ppb
Response Time 20 seconds
Sensor type UV Analzyer
Alarms Relays
Power Requirements 11-14 VDC or 120/240 VAC
Field Replaceable Battery No
Warranty 1 Year
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