3 products found
Versaperm Limited Products
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Water Vapour Sensors
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Electrolytic Water Vapour Sensors
Electrolytic water vapour sensors are based on a glass capillary tube containing two spiral wire electrodes coated with a thin layer of phosphorous pentoxide. As the gas flows along the tube moisture is absorbed by the phosphorous pentoxide (P2O5) and converted into phosphoric acid. An electrical potential is applied to electrolyze the water, producing hydrogen and oxygen and regenerating the phosphorous pentoxide. The current required by this gives a ...
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Capacitive Water Vapour Sensors
Capacitive water vapour sensors measure relative humidity (RH) by observing changes in capacitance between conductive electrodes. The sensor works like a plate capacitor with the bottom plate under a thin polymer hygroscopic dielectric. The plate above this allows water vapour to pass throughout polymer until it reaches equilibrium with the gas under measurement. The dielectric strength of the polymer is proportional to the water vapour content and this ...
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Impedance Water Vapour Sensors
Impedance water vapour sensors depend upon the absorption of water vapour by a porous non-conducting layer, (the material sample under test), sandwiched between two plate-type conductors. The active sensor layer can be extremely thin and the porous top conductor allows water vapour to flow into the sensor. Simply measuring the impedance of the resulting capacitor gives a measurement of Relative Humidity (RH) which, when combined with the temperature, ...