Dissolved CO2 Systems

The PTFE membrane is permeable to gases but not to water at atmospheric pressure.  The system detects dissolved partial pressure of CO2 in water and is insensitive to carbonates.  Note that this determination of CO2 partial pressure is not based on pH measurements.   The DCO2 Systems can be configured for various ranges of CO2 concentrations from ppm to 100% in gas phase.

Note that the response time of the standard system is slow (4-10 min) due to diffusion across the PTFE membrane.  The response time depends on the flow of the liquid past the DCO2 sampler, hence good stirring of the solution is essential.  The response time of the flow-through Rapid DCO2 System is faster 2 to 4 min.

Features

• Measure dissolved CO2 in fresh and seawater
• Customized to desired pCO2 range (ppm to 100%)
• Based on diffusion of CO2 out of the liquid
• Based on infrared gas analysis
• Insensitive to carbonates
• NOT based on pH measurements