Achema Instrumentation & Automation

Intrinsically safe signal transmission

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ELX EtherCAT Terminals with added Twinsafe SC technology enable compact safety solutions in hazardous areas Picture: Beckhoff
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The EtherCAT Terminals in the ELX series have been expanded from Beckhoff by the addition of analogue input terminals with Twinsafe SC (Single Channel) technology. These highly compact I/O terminals can be used to support applications in hazardous areas that require both intrinsically safe signal transmission and functional safety capabilities.

The compact ELX series terminals, which are certified in compliance with the specifications of the Atec and IECEx standards, enable direct connection of intrinsically safe field devices through to zone 0/20 based on an integrated safety barrier. The new terminal designs extended by Twinsafe SC technology now also make it possible to achieve a safety level equivalent to PL d/Cat. 3 according to EN ISO 13849–1 or SIL 2 according to EN 62061. In this way, it is possible to use all process data existing in a system for safety technology too, such as to monitor the speed of fans in areas sensitive to explosion hazards, for example.

The I/Os are available as 12 mm wide terminals with two or four analogue input channels for 0/4…20 mA, and for RTD resistance sensors, thermocouples/mV and strain gauges. Furthermore, a single-channel terminal is available for the direct connection of intrinsically safe incremental encoders, which evaluates a diagnostic-enabled Namur signal in accordance with IEC 60947–5–6.

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