System and Method to Measure Dissolved Gases in Liquid

A system capable of continuously measuring the concentration of at least one pre-selected dissolved gas in a sample water obtained from a quantity of water, comprising:

• a sample processing cell having at least a first conduit defining a first passage with at least one gas-permeable wall capable of passing at least the pre-selected dissolved gas from the sample water into an indicator liquid, the at least one gas-permeable wall resisting flow of the sample water therethrough, the at least one gas-permeable wall extending along a second conduit through which the sample water is capable of being conducted, and the at least one gas-permeable wall being in contact with the sample water in the second conduit;
• at least one pump to direct indicator liquid through the first conduit while moving the sample water and the indicator liquid relative to each other in one of a concurrent and a countercurrent flow relationship to generate at least partially equilibrated indicator liquid;
• and
• a device to measure the quantity of the dissolved gas in the at least partially equilibrated indicator liquid obtained from the first conduit.

A method for continuously measuring the concentration of at least one pre-selected dissolved gas in a sample water obtained from a quantity of water during a selected time period, comprising:

• selecting a sample processing cell having at least a first conduit defining a first passage with at least one wall capable of passing at least the pre-selected dissolved gas from the sample water into an indicator liquid, the at least one gas-permeable wall resisting flow of the sample water therethrough, the at least one gas-permeable wall extending along a second conduit through which the sample water is capable of being conducted, and the at least one gas-permeable wall being in contact with the sample water in the second conduit;
• directing indicator liquid through the first conduit while moving the sample water and the indicator liquid relative to each other in a countercurrent flow relationship to generate at least partially equilibrated indicator liquid;
• and
• optically measuring the quantity of the dissolved gas in the at least partially equilibrated indicator liquid obtained from the first conduit.