Pepperl Fuchs KFD2-SCD2-Ex2.LK Signal Conditioner Module

Pepperl+Fuchs KFD2-SCD2-Ex2.LK Signal Conditioner Module (SMART Current Driver)

 

The KFD2-SCD2-Ex2.LK is a 2-channel SMART current driver / signal conditioner (isolated barrier) from Pepperl+Fuchs, designed for 4–20 mA control signals with HART communication, typically used to drive I/P converters, control valves, and positioners in hazardous (Ex) areas.

Basic Information

• Part Number: KFD2-SCD2-Ex2.LK
• Brand: Pepperl+Fuchs
• Type: Signal Conditioner / SMART Current Driver / Isolated Barrier
• Function: Converts and transmits 4–20 mA control signals + HART communication to field devices

Technical Specifications (Key)

• Channels: 2-channel isolated output (pepperl-fuchs datasheet)
• Input Signal: 4–20 mA (control side)
• Output Signal: 4–20 mA (field side)
• Load Capability: up to ~650 Ω (typical 500–700 Ω range depending wiring)
• Supply Voltage: 19–30 VDC (Power Rail or terminals)
• Accuracy: ~0.05%–0.1% FS (high precision analog transmission)
• Line Fault Detection: open circuit / short circuit monitoring
• HART Support: Yes (SMART / bidirectional communication)
• SIL Rating: SIL 2 (IEC 61508)
• Mounting: 35 mm DIN rail (K-System)

Key Features

• Drives I/P converters and control valves directly
• Supports HART communication overlay on 4–20 mA loop
• Built-in line fault detection (LFD)
• High isolation between control and field side
• Dual-channel design for compact cabinet layout
• Suitable for Ex (intrinsically safe) applications

Application Areas

• Oil & gas process control
• Petrochemical plants
• Refineries
• Power plants
• Chemical dosing systems
• Control valve automation systems
• Hazardous area instrumentation (ATEX / IECEx)

Advantages

• High-precision analog signal transmission
• Supports SMART HART devices
• Strong electrical isolation for safety
• Reliable operation in Ex environments
• Built-in diagnostics reduce troubleshooting time
• Standard DIN rail installation (easy replacement)

Precautions

• Must be installed according to Ex safety requirements
• Correct load resistance must be ensured (4–20 mA loop stability)
• Do not bypass isolation barriers in hazardous areas
• Ensure correct Power Rail or 24 VDC supply
• Use shielded wiring for analog + HART signals