New wire-actuated encoder offers “robust, compact and flexible” solution


Siko, Germany specialists in automation and drive engineering products, has released a new wire-actuated encoder for 12m measuring length that promises robustness, compactness and flexibility.

Long measuring lengths and a housing that is as compact as possible are common requirement in intralogistics and with manufacturers of mobile machines. In stationary machine construction, too, it is an important factor in the choice of sensors for new machine concepts. Siko’s new SG121 wire-actuated encoder is unique on the market with its installation depth of just 70mm x 85mm x 105mm, but the space-saving wire-actuated encoder makes no compromises when it comes to sturdiness. The robust aluminum housing, coupled with impact-resistant plastic, survives even the harshest of operating conditions. Temperatures between -40 and +80°C, high shock and vibration loads, dirt, dust and water make no impression on the wire-actuated encoder. For outdoor applications in low temperature ranges, a version with integrated water drain holes is also available. This prevents water that has penetrated the sensor from freezing at below-zero temperatures and thus increases the service life.

Flexible down to the last detail 

The flexible 58mm flange system can be used with almost any interface. The customer can select the interface appropriate for the application, whether it’s an incremental interface such as HTL or TTL, or an absolute interface such as analog, SSI, CANopen, SEA J1939, CANopen Safety, Fieldbus or Ethernet.

The wire outlet also sets quality standards. With the unique Wire-Flex technology, it is possible to ensure that the wear on the wire is kept to a minimum, even if it pulls out at an angle. The conical shape of the wire outlet and the various types of wire ensure that any deposits on the wire can be removed easily. The wire-actuated encoder thus automatically compensates for mechanical tolerances in the machine or vehicle and protects the function and service life of the measurement system – even in harsh ambient conditions.

Also suitable for reliable position detection

The SIKO SG121 wire-actuated encoder provides increased safety in combination with the redundant WV58MR safety rotary encoder and can be used in the overall system in applications up to performance level d (PLd). This is made possible by the mechanical design and software specially designed for the purpose. Not only the electronics but also the mechanics are monitored and hazardous conditions are avoided. The new SG121 is therefore perfect for use in mobile machines.

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Saul Wordsworth is deputy editor of the iVT brand - which includes digital and print editions of a quarterly magazine and Off-Highway Annual, as well as He is a keen cyclist and lives in north London.

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