Available with 0–10 V or 4–20 mA outputs, active temperature sensors include duct mounted types, versions for wall mounting (indoors and outdoors), strap-on version for mounting on ducts and pipes, and version with remote probe. Immersion wells with mounting spring turn duct versions into immersion sensors for temperature measurement in fluids. Factory scaling is freely selectable and can be changed by user, and external fixing holes allow device to be mounted with closed cover.