Mini CO2

The most flexible instrument for dissolved CO2 measurements. Ideally suited for high-variability environments.

Mini CO2

The most flexible instrument for dissolved CO2 measurements. Ideally suited for high-variability environments.


  • Low power consumption
  • Compact size
  • Optional internal or external battery power
  • Easy integration
  • Large selection of concentration ranges
  • Digital option comes with internal data logger and controller with 2GB flash memory

pCO2 Sensor Applications

  • Coastal zone CO2 fluxes
  • Algae to fuel bioreactor feedback control
  • Groundwater and wellwater monitoring
  • Carbon budget studies for lakes and rivers
  • Carbon capture storage monitoring of aquifer and surface water levels of pCO2
  • Wastewater greenhouse gas emissions
  • Ocean glider and profiler missions

Mini CO2 Submersible pCO2 Sensor

The Mini CO2 instrument uses infrared detection to measure the partial pressure of CO2 gas dissolved in liquids. With pCO2 ranges from 0-2000 μatm up to 0-100%, the Mini CO2 provides the versatility needed for any application.

Mini CO2 submersible instruments are compact, lightweight, plug and play sensors. The instrument also measures total dissolved gas pressure (TDGP), a useful parameter for many applications and data correction.

With housing options rated to 6000 dbar of hydrostatic pressure, and resistance to most corrosive liquids, the Mini CO2 can provide reliable dissolved carbon dioxide data for many applications. Flow-through and in-line adapters are also available for simple and effective industrial solutions.

For specialized applications, Pro-Oceanus can provide custom solutions to suit any need.


Sensor Performance
CO2 Measurement Ranges 0-2000 μatm CO2
0-5000 μatm 
0-1% (10,000 μatm)
*other ranges available
Total Dissolved Gas Pressure 0-2000 mbar
Accuracy: pCO2 ± 3% of max range
TDGP ± 1%
Equilibration rate (t63) 3 minutes
Resolution 0.1% of max range
Length 28 cm (11 in)
Diameter 5.3 cm (2.1 in)
Weight Air 0.53 kg (1.2 lbs)
Water: -0.06 kg (-0.1 lbs)
Housing Material Acetal Plastic / Titanium
Depth Rating 0 - 600 m (Plastic)
Up to 6000 m (Titanium)
Water Temperature 0º to 35º C
Input voltage digital: 7-24 VDC
analog: 12-24 VDC
Power consumption 0.45W (35 mA @ 12 V)
Data output digital: RS-232, ASCII format
analog: 0-5 V or 4-20 mA
Sample rate 2 seconds (variable rate with logger/controller)


Pigtail Cables with Locking Sleeves
5, 10, 25, 50 meters, or longer

Water-Pumped Head
Reduce biofouling and improve response rate

External Battery Pack
19, 76 or 134 Amp-hour capacity

Titanium Housings
Rated up to 6000 m depth

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