SICK Stegmann (Dayton, OH) has released the PRF incremental wire draw encoders providing resolution to 0.025 mm at lengths to 50 m. They are available with HTL or TTL interfaces. The encoders consist of the wire draw mechanism and an encoder. The rotation of the drum is proportional to the length being measured. The drum rotation is converted to an incremental signal, which is transmitted by a standard rotary encoder.
The encoders are suitable for applications including crane, drilling, and excavator systems; presses, punching, and injection machines; weir systems and locks; high-bay shelving and theater stages; woodworking and stone processing machines; machinery construction; and medical technology.