Switch Amplifier with Line Fault Transparency for Comprehensive Line Fault Detection

Intrinsically safe circuits for signal connection in hazardous areas are state-of-the-art technology—whether analog or digital. However, the monitoring of connection cables is a completely different situation.

Previously, the implementation of line monitoring for digital transfers was costly. Switch amplifiers with line fault transparency (LFT) simultaneously transfer switching and error signals from the hazardous area to the control room via a single output. This distinguishes between switching states and error states in the control output side of a switch amplifier.

A resistive switching output in the isolated barrier transfers line fault and short circuit error signals from the input to the output circuit together with the sensor signal. The KFD2-SOT2-Ex1.N and HiC2831/2 (one/two channels) switch amplifiers from K- and H-System are equipped with this type of resistive transistor output. These switch amplifiers were developed specially for NAMUR sensors (EN 60947-5-6) and intrinsically safe applications up to SIL 2. The HiC2851 switch amplifier provides a similar solution for SIL 3 signal circuits.

With line fault transparancy:

• Amount of wiring is reduced
• Digital signals are transferred reliably
• Field and control side lines for each individual channel are monitored

Looking for more information on Pepperl & Fuchs Intrinsic Safety Products?

Download a copy of the PDF datasheet or brochure (listed on the right) or call the LC Automation Head Office Sales Department on 01254 685900.