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Model 306 Ozone Calibration Source

A portable source of ozone that is the perfect companion for calibrating virtually any ambient ozone analyzer – not just those manufactured by 2B Tech. The instrument scrubs ozone from ambient air and produces any mixing ratio of ozone in the range 30 to 1,000 ppbv.

  • Ozone mixing ratio controlled so as to be independent of ambient temperature, pressure and humidity
  • Level 4 transfer standard for calibrating ozone analyzers in the field relative to a lab standard
  • Schedule an autocalibration once daily that executes a series of up to 10 programmable output steps


  • Portable ozone calibration source that produces O3 by photolysis of O2 in air at 185 nm
  • Desired ozone concentration in the range of 30 to 1000 ppbv is chosen from the easy-to-use menu using a rotary select switch, or can be controlled remotely via the serial menu
  • Total output flow rate in the range 3.0-3.2 L/min volumetric and can be connected directly to the inlet of any ozone analyzer
  • Excess flow is vented through an internal overflow T capped with an ozone scrubber
  • Factory-calibrated against 2B Tech’s NIST-traceable standard
  • Can easily be calibrated against your lab ozone standard, allowing the instrument to be a transfer standard for calibrating ozone instruments in the field
  • Scheduler function allows a scheduled autocalibration once daily that executes a series of up to 10 programmable output steps
  • Please see our published paper for more information about the Model 306


Example Applications of the Model 306:

  • Maintaining the calibrations of networks of ozone analyzers
  • Testing of materials such as rubber, plastics and paint for effects of ozone exposure
  • Studies of the effect of ozone on plants where a calibrated source of ozone is required
  • Can be used to calibrate any ambient ozone analyzer, regardless of manufacturer
  • Has ambient bypass that allows instrument to be connected to an ambient ozone analyzer at all times
  • Can be programmed with a user-customizable calibration sequence of up to 10 steps
  • Scheduler feature allows custom calibration sequence to be ran automatically once daily at a user-defined time
  • Model 306 Ozone Calibration Source
  • 2.5A power adapter
  • Serial port cable (9PinF-9PinF)
  • Three feet of Teflon-lined tygon (1/4″ OD, 1/8″ ID) tubing for connecting to an ozone analyzer
  • USB flash drive preloaded with operation manual and other useful documentation
  • NIST-traceable calibration certificate
  • Only one version of calibrator available; no options
  • Comparison of Two Photolytic Calibration Methods for Nitrous Acid, A.J. Lindsay and E.C. Wood, Atmospheric Measurement Techniques (2022) 15, 5455-5464. AMT Link
  • Evaluating the Effect of Ozone in UV Induced Skin Damage, F. Ferrara, E. Pambianchi, B. Woodby, N. Messano, J.-P. Therrien, A. Pecorelli, R. Canella and G. Valacchi, Toxicology Letters (2021) 338, 40-50.  Science Direct
  • The Impact of Drought on Total Ozone Flux in a Mountain Norway Spruce Forest, T. Agyei, S. Juráň, K. Ofori-Amanfo Kwakye, L. Šigut, O. Urban and M.V. Marek, Journal of Forest Science (2020) 66, 7, 280-287.  Link
  • Protective Effects of a Comprehensive Topical Antioxidant Against Ozone-Induced Damage in a Reconstructed Human Skin Model, A. Pecorelli, D.H. McDaniel, M. Wortzman and D.B. Nelson, Archives of Dermatological Research (2021) 313, 139-146.  SpringerLink
  • The Influence of Ozone on Net Ecosystem Production of a Ryegrass-Clover Mixture under Field Conditions, T. Agyei, S. Juráň, M.E. Jonášová, M. Fischer, M. Švik, K. Kominková, K.K. Ofori-Amanfo, M.V. Marek, J. Grace and O. Urban, Atrmosphere (2021) 12, 12, 10.3390/atmos12121629.  MDPI Link


Spec Sheet
 Method of Ozone Production  UV Photolysis of O2 at 185 nm
 Ozone Concentration Range  0 ppbv and 30 ppbv to 1,000 ppbv
 Precision and Accuracy of
 Greater of 2 ppbv or 2% of ozone concentration
 Response Time for Change in
Ozone Output Concentration
 30 s to reach 95% of concentration change
 Flow Rate  3.0-3.2 Liter/min volumetric
 Power Requirements  12 V dc or 120/240 V ac, 18 watt
 Size  3.5 x 8.5 x 11 inches (9 x 21 x 29 cm)
 Weight  5.6 lb (2.6 kg)
 Analog Output  Yes; voltage output tracks ozone output and provides system error codes
 Serial Connection  Yes; for remote operation and system diagnostics
 Programmable Output  Yes; user-specified ozone output for up to 10 steps from 0 to 1,000 ppbv; stored in internal memory
 Scheduler  Yes; once-daily execution of the step program at user-specified hour
 Baud Rate  4800


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+1 (303) 273-0559

Case Studies

The Model 306 Ozone Calibration Source provided the ozone for a study of the adverse effect of elevated ozone on skin physiology. A correlation has been established between ozone exposure and skin conditions such as atopic dermatitis, psoriasis, acne, and eczema.

"I have been working in the ozone industry for close to 15 years and I am really impressed with your 2B [Model 306]calibrator! The accuracy and ease of use is unparalleled in the industry. Great job!"
Rob Turnbull

Managing Member at ToroSoleil, LLC

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