The EKF built-in duct sensors are used to measure temperatures in liquids and gases in pipelines, air ducts, or containers. For use in air ducts, the mounting flange (MF) is required. For use in liquids, nickel-plated brass immersion sleeves (THMs) must be used. For aggressive media, immersion sleeves made of stainless steel V4A (THV) are recommended. Immersion sleeves or mounting flange are not included in the scope of delivery and must be ordered separately as accessories.