Method for measuring humidity

A humidity-measuring device for measuring a humidity content of a sample gas flow, comprising:

• a controller;
• a cooling-region configured to cool the sample gas to a temperature equal to or lower than a temperature at which water in the sample gas condenses, the cooling-region including a condensation-region;
• and
• a temperature measuring device associated with the controller and disposed to measure a temperature at a location along the condensation-region;
• wherein, during operation, the humidity-measuring device operates to:
• transport the sample gas at a specific temperature above a dew point temperature to the cooling-region having a temperature equal to or lower than a temperature at which water in the sample gas condenses;
• cool the sample gas in the cooling-region to at least the condensation temperature, so that water condenses;
• purge the condensed water via a condensate outlet of the cooling-region absent heating and/or evaporating of the condensed water;
• determine a temperature of a position in a condensation-region of the cooling-region;
• and
• use the controller to calculate the humidity content of the sample gas based on the temperature of the position in the condensation-region of the cooling-region using calibration data.