The new SGH50 wire-actuated encoder from SIKO uses a clever cable mechanism for absolute measurement of hydraulic or telescopic cylinders. The sensor represents the latest generation of the SGH wire-actuated encoder family and now makes it possible to measure distances up to 5 m. Target applications are agricultural machinery, construction machines, municipal vehicles, forestry machines, piston accumulators and other industrial applications.
The new SGH50 offers a variety of benefits for mobile machines, including a significant extension of measurement length, above-average durability, and wide compatibility with various interface protocols, even for applications in which maximum safety is paramount.
With measurement lengths between 0 and 5 m, the SGH50 has the largest measurement range of the SGH series to date: one of its little brothers, the SGH25, covers measurement lengths in the mid-range between 0 and 2.5 m, and the other, the SGH10, covers lengths between 0 and 1 meter. The SGH50 can be integrated into hydraulic and telescopic cylinders and has an extremely durable design, thanks to a special plastic developed specifically for the purpose, which is characterized by an extension of fluid temperature resistance from 85° to 105°C.
When it comes to shocks and vibrations, too, the SGH50 sets new standards. It meets the specifications of the most extreme vibration standards, which are also used for testing helicopter turbines, and easily copes with shocks 100 times the force of gravity. Unlike rod-based sensors, its flexible cable completely absorbs vibrations. The hydraulic medium provides additional damping of any vibration.
The SGH50 is designed in particular for the highest requirements of mobile hydraulics. The wire-actuated sensor must meet the prerequisite of an extremely long service life in this context. It has been tested and designed for the service life of a cylinder both electrically and mechanically.
In order to cope with the harsh conditions of the mobile world, all of the sensors integrated into the cylinder are completely protected from external factors. SGH sensors therefore have a protection rating of IP69K and use KV1H plug connections.
Analog interfaces, CANopen or SAE J1939 provide the communication between the SGH50 sensor and machine control system. Applications in which maximum functional safety is essential can be supplied with redundant SGH50 versions (CAT3, PLd) in accordance with EN13849. For safety variants, SIKO also offers redundant or analog interfaces, redundant CANopen, redundant SAE J1939 or CANopen-safety.
With the integrated teach-in function, the measurement length of the sensor can be taught individually from 0 to 5 m. This leads to a significant reduction in the number of variants for OEMs and cylinder manufacturers.
With a maximum measuring range of 0 to5 meters, the cable-based SGH50 offers significant advantages to cylinder designers as far as manufacturing costs are concerned, as hollow boring of the piston is no longer necessary. Like all models in the SGH series, the SGH50 can also be integrated into telescopic cylinders, which is not usually possible with conventional measurement systems.