PIz series, DC/DC group, like other displacement transducers made by Peltron are based on the differential transformer principle – LVDT. The transformer is placed inside a cylindrical case. There is a magnetic core inside the transformer. Displacement of the core results in a change in the transducer’s output signal. This series is not equipped with a return spring so the core’s end has to be fixed to a moveable object. Transducers of PIz series to work properly need only power supply. It is used mainly to measure movement of concrete blocks in dams and parts of devices in power plants.