Pepperl+Fuchs KFD2-SOT3-EX1.LB Switch Amplifier

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Basic Information

Manufacturer: Pepperl+Fuchs
Product Type: K-System (KF-Series) Interface Module
Function: 1-Channel Signal Conditioner & Isolated Barrier for Hazardous Area Applications

Product Description

The KFD2-SOT3-EX1.LB is a galvanically isolated barrier designed for the transfer of digital signals from a hazardous area to a safe area. It accepts inputs from NAMUR sensors or dry mechanical contacts and provides two independent, passive transistor outputs.

This unit distinguishes itself with configurable output logic, allowing the second output channel to function either as a redundant signal splitter or as a dedicated fault indication output. With integrated Line Fault Detection (LFD) and SIL 2 (SC 3) functional safety rating, it is optimized for critical process automation loops requiring high availability and diagnostic transparency.

Technical Specifications

Application Fields

Chemical & Petrochemical Plants: Interface for NAMUR proximity sensors monitoring valve position in hazardous zones.
Fire & Gas Detection Systems: Reliable monitoring of smoke detectors or manual call points with SIL 2 integrity.
Turbine & Compressor Skids: Vibration sensor (proximity probe) interfacing with fault latching capabilities.
Safety Instrumented Systems (SIS): Where SC 3 systematic capability is required for the signal conditioning element.

Frequently Asked Questions - KFD2-SOT3-EX1.LB

Q: How do I wire a dry contact (switch) to this KFD2-SOT3-EX1.LB?
A: You must wire the contact in series with a resistor network (e.g., Pepperl+Fuchs F-NR3-Ex1) at the field end to simulate the NAMUR current levels. Alternatively, you can disable LFD via the DIP switch and connect a dry contact directly between Terminal 1+ and 2+. Note: Disabling LFD removes the module's ability to detect a field wire breakage.

Q: What is the difference between "Output I" and "Output II" isolation?
A: Both are galvanically isolated passive transistors. However, the isolation between Output I and Output II is Basic Insulation (60V) . If you are using both outputs to drive two different PLC input cards with different power supply references, ensure the potential difference does not exceed 60V to maintain safety isolation.

Q: What does "Passive Transistor Output" mean?
A: The module does not supply voltage on the output loop. You must provide an external DC voltage source (max 30V) in series with the load (e.g., a PLC input card). The module acts as a switch to pull this external loop to common (0V).

Q: What does "Um 253 V AC" signify in the hazardous area data?
A: This is the Maximum Safe Voltage that can be applied to the non-hazardous area side (power supply terminals) without compromising the intrinsic safety protection. It is not the operating voltage (which is 19-30 V DC). It indicates the module's robustness against mains voltage transients.