The oxygen sensor uses an electrode of the polarographic (Clark cell) type. This electrode is used in combination with the oxygen adaptor to form the dissolved oxygen sensor for measuring oxygen levels in water. The anode and cathode are immersed in electrolyte and separated from the sample by a semi-permeable membrane. The oxygen permeability of the membrane is temperature dependent. This variation in permeability is automatically compensated by a temperature compensation thermistor over the 5 to 45°C operating range.
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