Pepperl+Fuchs KFD2-STC5-Ex1 | 1-Channel SMART Transmitter Power Supply

Pepperl+Fuchs KFD2-STC5-Ex1 | Reliable SMART Transmitter Power Supply for Intrinsic Safety Applications

Overview

The KFD2-STC5-Ex1 is a 1-channel isolated barrier from Pepperl+Fuchs, designed to supply power to 2-wire and 3-wire SMART transmitters and 2-wire SMART current sources. It transfers analog input signals to the safe area as isolated current values and supports bidirectional communication for protocols like HART, BRAIN, and Foxboro. The device is SIL 2 certified according to IEC/EN 61508, ensuring high reliability in safety-critical applications.

Key Features

• Signal Type: Analog input

• Input: 2-wire and 3-wire SMART transmitters, 2-wire SMART current sources

• Output: 0/4–20 mA current sink/source

• Power Supply: 18–30 V DC via Power Rail or terminals 14+, 15-

• Load Resistance: 0–800 Ω

• Integrated Test Points: Terminals with test sockets for HART communicators

• Safety Certification: SIL 2 (IEC/EN 61508)

• Mounting: 35 mm DIN rail (EN 60715)

• Housing Dimensions (W×H×D): 20 × 124 × 115 mm

• Protection Class: IP20

• Part Number: 70124109

Technical Specifications

• Input Signal: 4–20 mA

• Open Circuit Voltage/Short-Circuit Current: 23 V / 25 mA

• Input Resistance: Max. 265 Ω (terminals 2-, 3), Max. 330 Ω (terminals 1+, 3)

• Available Voltage: ≥16 V at 20 mA; ≥20 V at 4 mA (terminals 1+, 3)

• Output Signal: 4–20 mA (overload >25 mA)

• Ripple: Max. 50 µA rms

• External Supply (Loop): 2–30 V DC

• Transfer Accuracy: ≤10 µA deviation at 20 °C

• Temperature Influence: ≤0.25 µA/K

• Frequency Range: 0–7.5 kHz (-3 dB)

• Settling Time: 200 µs

• Rise/Fall Time: 100 µs

• Galvanic Isolation: Functional insulation between output and power supply, rated insulation voltage 50 V AC

• Ambient Temperature Range: -20 °C to +70 °C

• Weight: Approximately 150 g

Applications

• Process Automation Systems

• Chemical and Petrochemical Industries

• Oil and Gas Facilities

• Pharmaceutical Manufacturing

• Water and Wastewater Treatment Plants

Why Choose Pepperl+Fuchs KFD2-STC5-Ex1?

• Versatile Input Compatibility: Supports both 2-wire and 3-wire SMART transmitters

• High Accuracy: Ensures precise signal transmission with minimal deviation

• Safety Certified: Meets SIL 2 requirements for safety-critical applications

• Compact Design: Slim housing saves space in control cabinets

• Integrated Test Points: Facilitates easy connection of HART communicators

NEW product in original sealed packaging. The product may be of older version or design. The packaging may have markings, signs of discoloration, and wear. DDPARTSSOLUTION Warranty: 1 Year. Manufacturer's Warranty and Support NEVER apply