Dissolved Oxygen Sensors

The dissolved oxygen sensor is the part of the instrument that takes the actual DO readings in the water. They are generally designed to match up with a specific DO meter, multi-parameter meter or sonde, though some probes will connect directly to a computer. DO sensors can be optical or electrochemical. The optical sensors measure the interaction of oxygen with a substrate based on returned wavelength and are ideal for extended deployments. Electrochemical sensors rely on a semi-permeable membrane to isolate the electrodes from the environment while allowing oxygen to diffuse across at a proportional rate. Electrochemical sensors can be galvanic or polarographic, with the former being self-polarizing.

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