Waycon (Germany) has developed the SX200 draw-wire encoder. It can be integrated into hydraulic cylinders measuring a stroke of up to 12 m.
DUE TO THE WAY THE CANopen-connectable hydraulic cylinder is assembled, the entire measuring system is, according to the supplier, optimally protected. The SX200 is suited for application in confined spaces. The measuring cable is connected to the piston and is pulled from the sensor during the operation of the cylinder. In the sensor itself, the measuring cable is coiled around a cable sheave, which rotates with each cylinder stroke, thereby turning the linear movement into a rotation. Through a sealed shaft (pressure implementation) the rotary movements are directed outwards into an unpressurized area and recorded by a sensor element (e.g. a digital absolute rotary encoder). The products are pressure-sealed up to 300 bar.
Through the evaluation of sensor signals, not only the position of the piston rod is regulated, but the specific cylinder positions are also recorded and the synchronic movement of multiple cylinders is ensured. The sensors also allow for rapid cylinder movements during this process. The IP65- or IP67-rated devices are dedicated for applications in harsh environments. They are specified for a temperature range from -20 °C to +70 °C. The embedded CANopen encoder features a 13-bit or 16-bit resolution.
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