Pepperl+Fuchs KFD2-STC4-Ex2 | 2-Channel SMART Transmitter Power Supply | 0/4–20 mA

Pepperl+Fuchs KFD2-STC4-Ex2 | Reliable Power Supply for SMART Transmitters in Intrinsically Safe Applications

Overview

The KFD2-STC4-Ex2 is a 2-channel isolated barrier from Pepperl+Fuchs, designed to supply power to 2-wire SMART transmitters in hazardous areas. 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 SMART transmitters

• Output: 0/4–20 mA current

• Power Supply: 20–35 V DC via Power Rail or terminals 14+, 15-

• Load Resistance: 0–550 Ω at 20 mA

• 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: 283699

Technical Specifications

• Input Signal: 0/4–20 mA

• Available Voltage: ≥16 V at 20 mA

• Output Signal: 0/4–20 mA (overload >25 mA)

• Ripple: Max. 50 µA rms

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

• Temperature Influence: ≤0.25 µA/K

• Frequency Range:

  • Field side to control side: 0–7.5 kHz (-3 dB)

  • Safe area to hazardous area: 0.3–7.5 kHz (-3 dB)

• Settling Time: 200 µs

• Rise/Fall Time: 20 µs

• Galvanic Isolation:

  • Output/Power Supply: Functional insulation, 50 V AC

  • Output/Output: Functional insulation, 50 V AC

• Ambient Temperature Range: -20 °C to +60 °C

• Weight: Approximately 150 g

Approvals and Certifications

• ATEX: II (1)G [Ex ia Ga] IIC, II (1)D [Ex ia Da] IIIC, I (M1) [Ex ia Ma] I

• IECEx: [Ex ia Ga] IIC, [Ex ia Da] IIIC, [Ex ia Ma] I

• UL: cULus Listed

• CE: EN 61326-1:2013 (industrial locations)

• UKCA: Certified

Applications

• Process Automation Systems

• Chemical and Petrochemical Industries

• Oil and Gas Facilities

• Pharmaceutical Manufacturing

• Water and Wastewater Treatment Plants

Why Choose Pepperl+Fuchs KFD2-STC4-Ex2?

• Intrinsic Safety: Suitable for use in hazardous areas with appropriate certifications

• High Accuracy: Ensures precise signal transmission with minimal deviation

• Galvanic Isolation: Protects control systems from field-side faults

• Compact Design: Slim housing saves space in control cabinets

• Easy Configuration: DIP switches allow for straightforward setup and mode selection

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