1 channel / 2 channel / ABZ sensor This clip shows the different measuring principles of Rheintacho rotational sensors using application examples on an electric motor. In addition to the single-channel version for pure rotational speed detection, there are also solutions with two (2) 90° off-set channels to detect both rotational speed and the direction of rotation. With customized gear-wheel geometry and new designed, innovative electronics, not only rotational direction and speed can be measured, but also the position.