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. 2017 Sep 28;12(9):e0185469. doi: 10.1371/journal.pone.0185469

Fig 1. Diagram of the portable NDIR CO2 equilibrator.

Fig 1

The portable CO2 equilibrator consists of a commercially available non-dispersive infrared (NDIR) CO2 gas analyser and data logger display interface, in-line air pump, impermeable-walled tubing and a section of gas-permeable membrane that is submerged in water. Air is pumped in a closed loop around the system and equilibrates with CO2 in seawater.