Speed sensors measure rotational movements on involute or rectangular geared sensor wheels in 1 and 2 channel versions. They are available for cog wheel modules from 1.0 to 3.0. They have a max. switching frequency of 20,000 Hz, or 25,000 Hz in special implementations. The speed sensor is also suitable for zero speed. The DWG 21 construction has a 45° cable connection port on the side. Various supply lines, cable protection options and connectors are available to choose, depending on the requirements.