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Position sensor

CANopen in space-constrained industrial systems

MTS Sensors, a division of MTS Systems Corporation, has expanded its E-Series of high accuracy position sensor devices with the introduction of the EP2. The sensor is available with a CANopen interface.

The sensor has IP67 protection level (Photo: MTS Sensors)

Like other members of the E-Series, the EP2 is a profile unit that is optimized for application scenarios where there is only limited space available for mounting. Based on the company’s proprietary Temposonics magnetostrictive technology, this sensor device has a stroke length of up to 2540 mm. It exhibits linearity to within ≤0,02 % full scale and ≤0,005 % full scale repeatability.

The EP2 is offered in a variety of different output formats including analog, CANopen, serial synchronous interface (SSI) and simple start/stop. CiA 301 version 3.0 and CiA 406 version 3.1 (encoder profile) are employed. The bit-rate ranges from 125 kbit/s to 1 Mbit/s. The sensor is supplied with the ordered bit-rate, which is changeable by the customer via LSS.

The sensor element and the supporting electronics of the EP2 are both held within a rugged aluminum housing, allowing deployment in challenging industrial environments. The position magnet travels over the complete sensor assembly, resulting in smoother operation, greater installation flexibility, and easier integration.

Use of multiple magnets can be supported where required, so that several different sets of positioning data can be ascertained. The EP2 has resilience to shock and vibration in accordance with IEC 60068-2-27 and 60068-2-6 standards. An operational temperature range of -40 °C to + 75 °C is covered.

“The EP2 offers a highly appealing position measurement solution for situations where space-constrained mounting proves to be a critical factor. It delivers a compelling combination of performance and price,” said Dr. Olaf Kissing, Product Manager Industrial at MTS Sensors.

Measuring technology with a position magnet

Temposonics position sensors consist of a ferromagnetic waveguide, a position magnet, a strain pulse converter, and supporting electronics. The magnet, connected to the object in motion in the application, generates a magnetic field at its location on the waveguide. A short current pulse is applied to the waveguide. This creates a momentary radial magnetic field and torsional strain on the waveguide. The momentary interaction of the magnetic fields releases a torsional strain pulse that propagates the length of the waveguide.

When the ultrasonic wave reaches the end of the waveguide it is converted into an electrical signal. Since the speed of the ultrasonic wave in the waveguide is precisely known, the time required to receive the return signal can be converted into a linear position measurement with both high accuracy and repeatability.