Pepperl+Fuchs KFA5-SR2-Ex1.W.LB | SIL2 Switch Amplifier

KFA5-SR2-Ex1.W.LB | Pepperl+Fuchs Switch Amplifier

Product Overview

• Pepperl+Fuchs KFA5-SR2-Ex1.W.LB is a 1‑channel isolated switch amplifier.
• It accepts dry contact or NAMUR inputs from field sensors.
• The relay output provides a clean switching signal to your control system.
• This unit includes a fault relay and line fault detection (LFD).
• It is approved for SIL2 per IEC 61508 and Ex‑input for hazardous areas.

Key Technical Data

• Brand: Pepperl+Fuchs
• Model: KFA5-SR2-Ex1.W.LB (Switch Amplifier)
• Supply Voltage: 103.5 … 126 V AC, 45 … 65 Hz (115 V AC nominal)
• Input: NAMUR sensor (EN 60947‑5‑6) or dry contact
• Output: Relay contact (changeover) and fault relay (NO)
• Line Fault Detection: Monitors sensor wire break and short‑circuit
• Mode: Reversible operation (normally open / normally closed)
• Safety: SIL2 capable per IEC 61508
• Protection: Ex‑input (intrinsic safety) for Zone 0/1/2

Installation & Compatibility

• Mounts on 35 mm DIN rail per EN 60715.
• Plug‑in terminal blocks simplify wiring and replacement.
• Compatible with all NAMUR proximity switches and mechanical contacts.
• Works with PLCs, DCS, and alarm systems accepting relay signals.

Maintenance & Diagnostics

• LED indicators show supply, input, output, and fault status.
• Line fault detection alerts you to broken or shorted sensor cables.
• Reversible mode lets you choose N.O. or N.C. behavior without rewiring.
• No calibration needed; simple front‑panel DIP switches for setup.

Certifications & Safety

• SIL2 rating per IEC 61508 for functional safety applications.
• Ex‑input (intrinsic safety) for hazardous areas (Zone 0, 1, 2).
• ATEX, IECEx, and CSA approvals available (check model suffix).
• Galvanic isolation between input, output, and supply.

Package Contents

• 1 × KFA5-SR2-Ex1.W.LB switch amplifier
• Instruction manual (English/German)
• Terminal blocks and marking tags
• 12‑month warranty certificate

Shipping & Delivery

• Dispatch: 12‑24 hours from order.
• Carriers: FedEx, UPS, DHL express.
• Tracking number provided within 24 hours.

Expert Review

• “The KFA5-SR2-Ex1.W.LB is our top choice for NAMUR switching in SIL2 loops. The LFD saves troubleshooting time, and the reversible mode adds flexibility for legacy systems.” — Senior Controls Engineer, PowergearX

Manager’s Insight

• “For critical level or pressure switches, this amplifier provides reliable isolation and fault detection. We recommend it for SIL2 projects where a fault relay is mandatory.” — Product Manager, Industrial Safety

Typical Applications

• Level monitoring with NAMUR proximity sensors.
• Pressure and flow switch interfacing to PLC/DCS.
• Ex‑zone signal conditioning for dry contacts.
• Safety loops requiring SIL2 and line fault supervision.

Frequently Asked Questions

• What is line fault detection (LFD)?
• It detects sensor wire break or short‑circuit and signals via fault relay.

• Can I use this with a mechanical switch?
• Yes, set the input to “dry contact” mode via DIP switch.

• What does “reversible mode” mean?
• You can choose the relay to energize on sensor ON or OFF.

• Is it hot‑swappable?
• No, turn off power before removing the module.

• Experience tip: For NAMUR sensors, use shielded twisted‑pair cables to avoid false triggering.
• Set the LFD threshold according to your sensor’s normal current (typically 1.2 – 2.1 mA).

Selection Guide

• Choose KFA5-SR2-Ex1.W.LB if you need 1‑channel NAMUR switching with SIL2 and line fault detection.
• For 2‑channel or higher density, consider KFA6 series.
• Check supply voltage: this model is 115 V AC only (not 24 V DC).
• If you don’t need Ex‑input, select the non‑Ex version KFA5-SR2.W.LB.

Contact Inquiries: sales@powergearx.com | +86 18030005825 (WhatsApp)

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