The Siemens duct sensor designed for use in ventilation and air conditioning plants where high accuracy and short response times for measuring relative humidity are required. It operates on AC 24 V or DC 13.5 to 35 V power supply and provides signal outputs for relative humidity and temperature. With its very high measuring accuracy across the entire measuring range, capacitive humidity measurement, and a range of use of -40 to +70 °C / 0 to 100 % r.h., the duct sensor ensures precise and reliable measurements. It is suitable for a variety of applications including storage and production facilities, laboratories, hospitals, computer and EDP centers, indoor swimming pools, and greenhouses. Operating voltage AC 24 V / DC 13.5 to 35 V Very high measuring accuracy across the entire measuring range Function test for ensuring proper operation Capacitive humidity measurement for accurate readings Wide range of use from -40 to +70 °C / 0 to 100 % r.h. LCD display for easy readouts Suitable for control, limit, and enthalpy/absolute humidity sensing