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The room sensor HYGRASGARD® FSFM ⁄ FSFTM in the in-wall enclosure is used for measuring the relative humidity and temperature of the air. It converts the measured values into a standard signal of 0 -10 V. A digital, long-term stable sensor is used for humidity and temperature measurement. Relative humidity [% r.H.] is the quotient of water vapour partial pressure divided by the saturation vapour pressure at the respective gas temperature.