Pro-Oceanus: CO2-Pro™ Atmosphere pCO2 Sensor

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

The CO2-Pro™ Atmosphere instrument measures the partial pressure of CO2 gas in both surface water and air. 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 pCO2 instrumentation for the Coastal and Global Scale Nodes component of the US OOI, Ocean Observatories Initiative.


  • – 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


Sensor Performance
Resolution0.01 ppm
Zero driftautomatic 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:
Length33 cm (13 in)
Diameter19 cm (7.5 in)
WeightAir: 6.6 kg (14.5 lbs)
Water: -0.5 kg (-1.1 lbs)
HousingAcetal Plastic
Depth5 m
Water Temperature0º to 30º C (Standard)
-2º to 20º C (Arctic)
15º to 40º C (Tropical)
Air-side NEMA Enclosure Size:30 x 30 x 10 cm
Input voltage10-18 VDC
Power consumption4W (12W during warmup, includes SBE 3K pump)
Data outputRS-232, ASCII format, 0-5 V or 4-20 mA
Sample rate1 second (variable rate with logger/controller)

Telemetry2U Compatible

Telemetry2U lets you monitor your sensors, control devices and automate tasks – all through one simple, secure, and configurable IoT platform. Pro-Oceanus products are compatible with their technology, allowing for:

  • – Real-time data access on any device
  • – Alerts and alarms for parameters you define
  • –  Comprehensive reporting and historic data visualizations available on customizable dashboards

Servicing, Calibration and Support

Imbros’ local engineering department can service, repair and calibrate your instrument without expensive shipping costs or wait times.


More information from Pro-Oceanus Download Datasheet

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