In Process Monitoring of Dissolved Carbon Dioxide

CO2 Dipping Probe DP-CD1

The CO2 dipping probe DP-CD1 is an optical sensor based on a 2 mm polymer optical fiber. The end of the probe is covered in a high-grade steel tube. It is the solution for invasive measurements and monitoring of dissolved CO2.

  • Online monitoring
  • Measurement range from 10 - 250 hPa pCO2 (8 ... 180 mmHg)
  • No consumption of carbon dioxide
  • Measures carbon dioxide in liquids
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Scientific: Carbon Dioxide Monitoring for Biological Applications

Increased CO2 uptake from the atmosphere caused by anthropogenic sources is believed to cause ocean acidification, with not yet foreseeable effects on marine life and ecosystem. Monitoring pCO2 in experimental set-ups simulating future levels of carbon dioxide can help to gain knowledge on the effects of ocean acidification on marine fauna. Besides the marine application, monitoring pCO2 also allows knowledge to be gained on land-based plant physiology. Monitoring pCO2 helps increasing yield during aquaculture of fish (fish farming) by providing convenient growth conditions. Excess carbon dioxide levels need to be monitored as this leads to hyperventilation of sea animals.


*provided pCO2 spots are used without futher handling in physiological solutions
**after multipoint calibration 
***in a carbon dioxide incubator with 100 % rel. Hum. at 5 % CO2; measurement interval of 1 min
Measurement range

1 - 25 % CO2 at atmospheric pressure (1013.15 hPa)
10 - 250 hPa pCO2
8 - 180 mmHg pCO2

Resolution at 20 °C ± 0.06 % at 2 % CO2
± 0.15 % at 6 % CO2
± 0.5 mmHg at 15 mmHg pCO2
± 1.2 mmHg at 45 mmHg pCO2
Accuracy** ± 5 % of reading or 0.2 % (1.5 mmHg); whichever is higher
Drift at 37 °C*** Typically < 5 % of reading per week
Measurement temperature range From + 15 °C to + 45 °C
Response time (t90) at 20 °C < 3 min. for change from 2 % to 5 % (15 mmHg - 38 mmHg) pCO2


Compatibility Aqueous solutions, pH 4 - 9
Cross-sensitivity Optical pCO2 sensors display reduced cross-sensitivity to ionic strength (salinity); acetic acid, SO2, HCl vapours
Stability pCO2 sensors do not stand: organic solvents, pH above 10 or below 4
Cleaning procedure Depends on the sensor type used - please ask our experts
Calibration pCO2 spots are pre-calibrated; re-calibration is possible
Beta-irradiated or autoclavable pCO2 sensors available


12 months provided the pCO2 sensor is stored in its original package

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