Bullet Sensors & Transducers e-Digest, Vol. 94, Issue 7, July 2008: Product News

    (ISSN 1726- 5479)


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Accurate Monitoring of Hydraulic Cylinder Displacement



Telford UK - The new Gefran RK Series position transducer uses a contactless magnetostrictive linear sensor for accurate and reliable displacement measurement in hydraulic applications. The RK Series is designed for OEM use within the hydraulic cylinder, typically for monitoring and control in mobile applications, such as earth moving, agricultural and mining equipment.


Suitable for cylinder stroke lengths from 50 mm to 4000 mm, the compact sensor has a 10 mm diameter probe, with a compact, versatile head arrangement smaller than any other solution currently available on the market. External connection to the head is via an IP67 rated cable connection, up to 50 m long, providing a straightforward analogue output of displacement, with an industry leading linearity and accuracy of better than 0.02% of Full Scale.


The robust and durable transducer relies on the interaction between a magnet on the moving piston and the magnetostrictive transducer rod element. This enables a non-contact, solid state position measurement, that is not subject to mechanical wear, tolerates working temperatures up to 90 C, with 20 g vibration and 100 g shock, and is sealed against the hydraulic environment for working pressures up to 700 bar.


The RK Series transducer provides a direct analogue voltage output (0-10 V) proportional to position, using a standard 18-30V DC power supply:

optionally available, a 12 V powered unit provides an analogue 0-5 Volt output. The magnetostrictive timing pulses from the transducer can also be monitored by the Gefran EK Series remote electronics module. This module offers CANopen and other digital interfaces, transmitting digital position and speed of movement measurement information (up to 10m/sec) to the equipment control system. The EK Series modules are also capable of monitoring the position of 2 or more magnets operating on the same magnetostrictive transducer rod element, if required.





Gefran SIEI UK Limited

7 Pearson Road, Central Park

Telford, TF2 9TX

Tel.: 08452 604555

Fax: 08452 677455

E-mail: sales@gefran.co.uk


RK Series position transducer





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