Model 205 Ozone Analyzer

The Model 205 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.

4-5 weeks

The Model 205 Dual Beam Ozone Monitor makes use of two detection cells to improve precision, baseline stability, and response time.  In the Dual Beam instrument, UV light intensity measurements Io (ozone-scrubbed air) and I(unscrubbed air) are made simultaneously. Combined with other improvements, this made it possible to reduce the time between ozone measurements to 2 seconds, making our instrument the fastest UV-based ozone monitor on the market, while still retaining the small size, weight, and power requirements of our popular Model 202 Ozone Monitor.  Fast measurements are especially desirable for aircraft and balloon measurements where high spatial resolution is needed.  For 10-s averaging, a precision of 1.0 ppb is achieved.  Alternatively, one can choose to average more points internally to obtain even better precision.  Flash card memory and a long-life, quiet internal air sampling pump are now standard on the instrument.  The Model 205 Dual Beam Ozone Monitor has been approved by the EPA as a Federal Equivalent Method (FEM) based on a modification of the Model 202: EQOA-0410-190.



     -Quiet long-life internal air pump (now standard)

     -Low power consumption (~8 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 2 s or data averaging times of 10 s, 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

     -Dual beam feature allows for heightened precision and improved baseline stability for applications where high spatial resolution is required.



     -GPS for continuous logging of latitude, longitude, and altitude (for 10-s data mode and above)

     -Rechargeable lithium-ion battery provides 12 hours of continuous operation

     -External particle filter

     -Serial-to-USB adapter

     -4-20 mA analog current output

     -Bluetooth for wireless data transmission

     -Low-temperature package for operation to -20 degrees C (pump, lamp heater)

     -High-altitude upgrade (pressure sensor for use up to 25 km altitude)

     -Extra long-life, low temperature internal air pump

     -Low-power option for even lower power consumption

     -Rack-mount case configuration


Schematic Diagram:


System Includes:

     -Model 205 Dual Beam Ozone Monitor

     -Quiet, Long-Life Internal Air Pump

     -AC Power Adapter (100-240 VAC to 12 VDC) with Country-Specific Plug

     -Cigarette Lighter Adapter 

     -Battery Wire Connector

     -Zeroing Cartridge

     -Flash Card Memory for virtually unlimited, portable data storage

     -SD Card (> 2 GB) and SD Card Reader

     -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 1.0 ppb or 2% of reading for 10-s average


Greater of 1.0 ppb or 2% of reading

Limit of Detection (2σ)

2.0 ppb (in 10-s measurement mode)

NIST-Traceable Calibration


Measurement Interval

2 s (Data averaging options: 10 s, 1 min, 5 min, 1 hr)

Flow Rate (nominal)

~1.8 Liter/min

Flow Rate Requirement

>1.2 L/min

Baseline Drift

< 1 ppb/day
< 3 ppb/year

Sensitivity Drift

< 1%/day
< 3%/year

Measurement Time, Frequency

2 s, 0.5 Hz

Response Time, 100% of Step Change

4 s, 2 points

Averaging Times

2 s, 10 s, 1 min, 5 min, 1 hr

Internal Data Logger Capacity

16,383 lines (2-s fast measurement mode = 9.1 hr; 10 s avg. = 1.9 days; 
1 min avg = 11 days; 5 min avg = 1.9 mo; 1 hr avg = 1.9 yr

SD Card Logger Capacity

> 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

12 V DC or 120/240 V AC, 650 mA, 8 watt (7 watt with cell heater unplugged)


3.7 x 8.5 x 11.5 inches (9.5 x 21.5 x 30 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 205 Brochure

Model 205 Manual

More Information
Manufacturer 2B Technologies
Call For Price No
Gas Ozone (O3)
Resolution 0.1 ppb
Response Time 4 seconds
Sensor type UV Analzyer
Sampling Method Fan
Alarms Relays
Power Requirements 12 VDC or 120/240 VAC
Size 3.7 x 8.5 x 11.5 inches (9.5 x 21.5 x 30 cm)
Field Replaceable Battery No
Warranty 1 Year
Audible Alarm No
Calibration Annually
Range 0-250 ppm
Unit Features

- Standard Enclosure

- Dual beam optical bench for faster response time

- Eliminates Water Vapor Interference

- Includes data logging with software

Sensor Range

0-250 ppm (O3)

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