Manufacturer of the EN-SCI ECC Ozonesonde

The EN-SCI ECC Ozonesonde was developed by Dr. Walter Komhyr and sold for decades by EN-SCI Corporation. A lightweight, compact, and inexpensive instrument for measuring atmospheric ozone, the EN-SCI Ozonesonde is the worldwide standard for accurate, balloon-borne ECC ozone measurements.

ECC Ozonesonde

A lightweight, compact, and inexpensive balloon-borne instrument for measuring atmospheric ozone.

Cryogenic Frost Point Hygrometer

A sonde that accurately and precisely measures water vapor at elevations from the earth’s surface to the mid-stratosphere.

DAS-2 Data Acquisition

Allows for data acquisition, data processing, and post-processing analysis.

Ozonizer Test Unit

Designed for conditioning ECC Ozonesondes with ozone and for checking the performance of the sondes prior to flight.


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  • Atmospheric research
  • Climate-change studies


  • Accurate, precise, high-resolution ozone measurements
  • Unique design that allows pump operation without ozone-destroying lubricants
  • Easily coupled with the most popular radiosonde models for parameters such as GPS coordinates, pressure/altitude, temperature, and relative humidity
  • Portable and economical data system (optional)


How it Works

Unlike some ozonesondes, ECC sondes do not require an external electrical potential. The ECC gets its driving electromotive force from the difference in the concentration of the potassium iodide solutions in the instrument’s cathode and anode chambers. When ozone enters the sensor, iodine is formed in the cathode half cell. The cell then converts the iodine to iodide, a process during which electrons flow in the cell’s external circuit. By measuring the electron flow (i.e., the cell current) and the rate at which ozone enters the cell per unit time, ozone concentrations can be calculated.

How to Order

Contact EN-SCI for pricing or more information.


infoicon Phone: +303 484 9774


For INDIA orders contact Liberty International:

Liberty International
14402 Bethany Ave.
Chino, CA 91710 USA
infoicon Phone: 909-606-8417
infoicon Fax: 909-606-8408

Liberty International INDIA
#414, Abhishree, Opp. Star Bazaar
Satellite, Ahmedabad-380015, India
infoicon Phone: +91-79-2692-6360
infoicon Fax: +91-79-2692-6380


Selected Bibliography

Komhyr, W.D., “Electrochemical Concentration Cells for Gas Analysis,” Ann. Geophys., 25: 203–210, 1969.

Komhyr, W.D., J.A. Lathrop, D.P. Opperman, R.A. Barnes, and G.B. Brothers, “ECC Ozonesonde Performance Evaluation during STOIC 1989,” J. Geophys. Res., 100(D5): 9231-9244, 1994.

Reid S.J., G. Vaughan, A.R. Marsh, and H.G.J. Smit (1996), “Intercomparison of Ozone Measurements by ECC Sondes and BENDIX Chemiluminescent Analyser,” J. Atm. Chem., 25, 215-226.

Smit, H. G.J, W. Straeter, B. J. Johnson, S. J. Oltmans, J. Davies, D. W. Tarasick, B. Hoegger, R. Stubi, F. J. Schmidlin, T. Northam, A. M. Thompson, J. Witte, I. Boyd, F. Posny (2007), “Assessment of the Performance of ECC-ozonesondes under Quasi-flight Conditions in the Environmental Simulation Chamber: Insights from the Jülich Ozone Sonde Intercomparison Experiment (JOSIE),” J. Geophys. Res., 112, D19306, doi:10.1029/2006JD007308.

Stübi R., Levrat G., Hoegger B., Viatte P., Staehelin J., Schmidlin F. J.: 2008, “In-flight Comparison of Brewer-Mast and Electrochemical Concentration Cell Ozonesondes,” J. Geophys. Res., 113, D13302, doi:10.1029/2007JD009091.

Terao, Y., and J. A. Logan (2007), “Consistency of Time Series and Trends of Stratospheric Ozone as seen by Ozonesonde, SAGE II, HALOE, and SBUV(/2),” J. Geophys. Res., 112, doi:10.1029/2006JD007667.