The Elta 149-HS is a reliable humidity sensor designed for automatic control of ventilation systems based on relative humidity levels. It operates on a 220 – 240VAC 50Hz supply and covers a humidity sensing range from 30% to 100% RH. Capable of handling fan loads up to 1A, the sensor includes a control knob for easy adjustment of the setpoint to suit specific environmental requirements. Ideal for bathrooms, kitchens, or areas requiring moisture regulation, this unit ensures efficient and responsive humidity-based fan activation.