Cable-Extension Position Transducers... Detect and measure linear position and velocity using a flexible cable and spring-loaded spool. Celesco pioneered this innovative design and continues to enhance it. Industrial- grade models are available in measurement ranges from 0-2" to 0-1700" that meet NEMA 4 requirements.
Simply attach the transducer's housing to a fixed surface and its stainless steel cable to the moving object. As the cable extends, an electrical signal proportional to the cable's linear extension or velocity is provided for display, recording, or input to a controller.