Versaperm Vapour Permeability measurement

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, determines the absolute humidity and thus the number of water vapour atoms in the gas.

At Versaperm we are not tied to any specific sensor types or manufacturer and so we can always select exactly the right sensor for an application. Versaperm is a world technology leader in the measurement of gas permeability. We offer not only instruments but also comprehensive testing and consultancy services.