Electrical impedance hygrometer - dew point probe : Hygrometers : Humidity : Good practice online modules : Publications : National Physical Laboratory

Electrical impedance hygrometer (2)

Capacitive hygrometer

Capacitive (impedance) "dew-point" hygrometer

'Dew-point' probe

Hygrometer based on an electronic sensor changing electrical capacitance on absorbing water, capable of measuring trace levels of water vapour in very dry gases.
Often scaled in units of dew point (or frost point) - hence the instrument name - but readings can be displayed in other terms.

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