ECC Ozonesonde

Principle of Operation
Data Acquisition System
Items Included in Purchase
How to Order
Selected Bibliography
Print Version of Brochure
Online Resources for Sonde Users 


The DMT/EN-SCI Electrochemical Concentration Cell (ECC) ozonesonde is a lightweight, compact, and inexpensive balloon-borne instrument for measuring atmospheric ozone. Developed by Dr. Walter Komhyr and sold for decades by EN-SCI Corporation, it is now manufactured exclusively by DMT. 



  • 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)



  • Atmospheric research
  • Climate-change studies


Principle of Operation

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.


Photo: ECC Ozonesonde being launched in Fairbanks, Alaska. Photo courtesy of NOAA/ESRL Global Monitoring Division.        



Information about the accuracy, precision and resolution of the DMT/EN-SCI ECC Ozonesonde appears below. 

At 1000 hPa: ±5% accuracy, ±4% precision, 0.3 km resolution
At 200 hPa: ±12% accuracy, ±12% precision, 0.3 km resolution
At 100 hPa: ±5% accuracy, ±3% precision, 0.3 km resolution
At 10 hPa: ±5% accuracy, ±3% precision, 0.4 km resolution
At 4 hPa: ±10% accuracy, ±10% precision, 0.4 km resolution

Resolution figures correspond to approximately a 90% step change in ozone in one minute. Additional specifications appear below.

Technique Electrochemical process that generates electrical current in proportion to ozone concentrations
Measured Parameters Ozone partial pressure, sonde housekeeping parameters
Operating Pressure 1050-4 hPa
Operating Temperature 0 – 40 °C
Inside flight box ambient temperature to -90 °C
Power Requirements 12 – 18 VDC, 120 mA
Weight (including battery) 480 g for instrument, including wet battery
240 g for polystyrene flight box
Instrument Dimensions 7.6 cm x 7.9 cm x 13.3 cm
Flight Box Dimensions 19.1 cm x 19.1 cm x 25.4 cm

Specifications are subject to change without notice.


Data Acquisition System

The Model DAS-2 Data Acquisition and Processing System allows for data acquisition, data processing, and post-processing analysis. The DAS-2 system includes the following components: 

  • Software
  • Laptop
  • Modem
  • Tripod-mounted 403 MHz Yagi antenna with preamplifier
  • 403 MHz receiver
  • 15-meter co-axial signal cable




The DMT/EN-SCI ECC Ozonesonde is available in several models to accommodate different types of radiosondes or operating environments:

Model Z: fits Vaisala RS92 digital and analog radiosondes
Model 2Z-V2D(E): fits older Vaisala radiosondes
Model 2Z-V7: fits InterMet radiosondes
Model 4Z: designed for ground use


Items Included in Purchase Price

  • ECC ozonesonde(s)
  • Operator manual
  • One-year warranty




How to Order

Contact DMT for pricing:

Phone: +1.303.440.5576,


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.