Turck’s contactless QR24 encoders for Ex applications

Turck Australia introduces a new variant of their contactless QR24
encoders for use in explosion protected areas. The new contactless QR24-Ex featuring
an IO-Link interface increases plant availability in Ex applications thanks to
its dust- and shock-resistant design.

Turck’s new contactless QR24-Ex encoders are recommended for use in
explosion protected areas – Zones 2, 22 and 3GD. Contactless measurement considerably
outperforms bearing-guided optical encoders in dust-laden environments since
optical encoders are susceptible to dust.

The sensor unit and positioning element on the QR24 are fully potted and
cast as two totally sealed independent units, ensuring optimum protection from
dust, vibration, impact and shocks. Unlike encoders with magnetic positioning
elements, the QR24 offers greater resistance to magnetic field interference.

The QR24-Ex contactless encoders find application in the chemical,
mining and food industries – particularly in mills. However, many applications
in the textile or wood processing industries also require the use of an encoder
with 3GD approval.

Part
of Turck’s Premium encoder line, the QR24-Ex outputs its signal via the IO-Link
V1.1 interface, thereby offering simpler parameter setting such as for the
output signal or zero point. The encoder can be used as a single-turn, semi multi-turn
rotary encoder that counts its revolutions. For this, the encoder uses 16 bits
of the 32-bit IO-Link signal for the single-turn value, 13 bits for the number
of revolutions and the remaining three bits for diagnostics data. Operating
status can be determined at any time and maintenance can be planned in advance,
thereby effectively preventing machine downtime.

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