AlOx sensors consist of a pourous oxide layer within a thin aluminium coating which allows for water vapour to equibrilate on the pore walls of the oxide layer. The number of water molecules absorbed on the xoide structure determines the conductivity of the pore walls, which is functionally related to the water vapour pressure expressed as water dew point, PPMv, PPMw and other units of measurement. These sensors are easy to install and replace within the field and have a large range of measurement, available with -110oC to +60oC dew point. The sensors are calibrated in nitrogen with known moisture contents for every application.
