P2O5 (phosphorous pentoxide)
The electrolytic moisture sensor used by Systech Illinois employs the well known phosphorus pentoxide principle for accurate determination of trace levels of moisture in inert gas streams. Phosphorus pentoxide is a potent dehydrating agent. P205 (diphosphorous pentoxyde). P205 is a highly hygroscopic substance which absorbs the water from the sample gas. Through continuous dissociation of the water a balance between the water content of the sample gas and the water which is being dissociated builds up. The electrolysis current is proportional to the water content in the sample gas. It is displayed on the instrument readout after it is processed by the instruments signal amplifier.
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