CO2-Pro™ ATM

Ruggedly designed for CO₂-flux studies in the harshest environments; integrated on ocean buoys around the world.

CO2-Pro™ ATM

Ruggedly designed for CO₂-flux studies in the harshest environments; integrated on ocean buoys around the world.


  • Measurement of pCO2 in both air and surface water simultaneously
  • Patented tubular interface provides unmatched biofouling resistance
  • High accuracy, long-term stability
  • Easy integration into buoy and shipboard systems
  • Real-time data output; no post-processing
  • Internal data logger and controller with 2GB flash memory

pCO2 Sensor Applications

  • Surface CO2 flux studies
  • Long-term ocean pCO2 monitoring
  • Open ocean studies
  • Coastal zone CO2 fluxes

CO2-Pro™ Atmosphere pCO2 Sensor

The CO2-Pro™ Atmosphere instrument measures the partial pressure of CO2 gas in both surface water and air for accurate determination of CO2 flux. An internal zeroing feature provides drift correction for stable and accurate long-term measurements.

Designed for use on buoys, the rugged unit is comprised of a CO2-Pro™ that mounts under the buoy for water measurement connected to a NEMA box that is used to take in air from above the buoy. Alternating measurements of pCO2 in air and water provide accurate data for reliable surface flux calculations. The instrument is well-suited for integration into shipboard flow-through systems.

Sensors are calibrated using WMO traceable standards. Measurement of gas pressure and humidity along with stabilized detector temperature provides accuracy unparalleled by other small submersible pCO2 sensors.

The CO2-Pro™ Atmosphere was chosen as the air-sea CO2 flux sensor for the Coastal and Global Scale Nodes component of the US OOI, Ocean Observatories Initiative.

For more details on calculating Air-Sea Carbon Fluxes click here: Measurement of Air-Sea Carbon Fluxes


Sensor Performance
Accuracy ±0.5%
Resolution 0.01 ppm
Zero drift automatic zero compensation
Equilibration time (t63)

water: 2.5 min

air: 5 sec

Standard range
(alternate ranges available)
0-600 ppm
0 - 1000 ppm
0 - 2000 ppm
CO2 -Pro Submersible:
Length 33 cm (13 in)
Diameter 19 cm (7.5 in)
Weight Air: 6.6 kg (14.5 lbs)
Water: -0.5 kg (-1.1 lbs)
Housing Acetal Plastic

5 m

Water Temperature 0º to 30º C (Standard)
-2º to 20º C (Arctic)
15º to 40º C (Tropical)
Air-side NEMA Enclosure Size: 34.5 x 21.5 x 12.3 cm
Input voltage 10-18 VDC
Power consumption 7.1 W (@12VDC), 12 W during warmup, includes SBE 3K pump
Data output RS-232, ASCII format, 0-5 V or 4-20 mA
Sample rate 1 second (variable rate with logger/controller)


External Battery Pack
76, 134, or 247 Amp-hour capacity

Seabird Water Pump with Cable
5P (Plastic) or 5T (Titanium)

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