Pepperl+Fuchs KFD2 Modules KFD2-STC4-EX1.H

Name: Pepperl+Fuchs KFD2 Modules KFD2-STC4-EX1.H
Brand: Pepperl+Fuchs

Model: KFD2-STC4-EX1.H

Brand Pepperl+Fuchs

Series KFD2

Model KFD2-STC4-EX1.H

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Technical Dossier

Product Details And Specifications

Pepperl+Fuchs KFD2 Series Technical Notes

The Pepperl+Fuchs KFD2 series represents one of the most widely deployed families of DIN-rail-mounted signal conditioners and isolating barriers in global heavy industry. Installed across chemical processing plants, nuclear power facilities, oil refineries, and offshore platforms, KFD2 modules serve as the critical interface layer between hazardous-area field instruments (4–20 mA transmitters, thermocouples, RTDs, discrete I/O) and safe-area control systems including DCS, PLC, and SCADA architectures. The series is engineered to ATEX, IECEx, and FM/CSA standards, enabling intrinsically safe (Ex ia) and non-incendive circuit topologies in Zone 0/1/2 and Division 1/2 classified areas. The KFD2 platform has accumulated decades of installed base in facilities operated by BASF, Shell, ExxonMobil, Sinopec, and comparable tier-1 industrial operators, making long-term spare parts availability a critical procurement concern.

The Evolution of KFD2 Architecture

The KFD2 series was introduced by Pepperl+Fuchs as a successor to earlier KFD and KFA barrier families, consolidating signal conditioning, galvanic isolation, and hazardous-area protection into a single compact 20 mm or 40 mm DIN-rail module. Early KFD2 variants relied on transformer-based galvanic isolation with passive loop power. Subsequent generations introduced active signal processing, HART transparency (allowing HART pass-through for field device diagnostics without breaking the 4–20 mA loop), and enhanced EMC shielding compliant with EN 61326. The KFD2-STC4 sub-family specifically addresses 2-wire transmitter power supply with current output, a topology dominant in legacy DCS installations using FOUNDATION Fieldbus-adjacent wiring infrastructure. As facilities transitioned from pneumatic to electronic instrumentation through the 1990s and 2000s, KFD2 modules were retrofitted into existing marshalling cabinets, creating a long-tail installed base that persists through the 2020s. Pepperl+Fuchs has progressively migrated new designs toward the KFD3 and FieldConnex series, placing the KFD2 family in a mature/end-of-active-development lifecycle. However, the series remains in production for the majority of catalog numbers, with select models transitioning to managed availability status.

KFD2 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked models within the Pepperl+Fuchs KFD2 series, organized by functional category. Each model is available for sourcing through DriveKNMS.

Transmitter Power Supply / Signal Conditioners (4–20 mA)

KFD2-STC4-EX1.H: 2-wire transmitter power supply, 1-channel, 4–20 mA output, HART transparent, Ex ia IIC
KFD2-STC4-EX1: 2-wire transmitter power supply, 1-channel, 4–20 mA, without HART, Ex ia IIC
KFD2-STC4-EX2: 2-wire transmitter power supply, 2-channel, 4–20 mA, Ex ia IIC
KFD2-STC4-EX2.H: 2-wire transmitter power supply, 2-channel, HART transparent, Ex ia IIC
KFD2-CD-EX1.32: Repeater power supply, 1-channel, 4–20 mA, loop-powered, Ex ia
KFD2-CD-EX2.32: Repeater power supply, 2-channel, 4–20 mA, Ex ia IIC

Temperature / RTD / Thermocouple Inputs

KFD2-UT2-EX1: Universal temperature transmitter interface, 1-channel, RTD/TC/mV/Ω input, 4–20 mA output
KFD2-UT2-EX2: Universal temperature transmitter interface, 2-channel, RTD/TC input, 4–20 mA output
KFD2-GUT-EX1.D: Universal temperature converter, galvanically isolated, 1-channel, DIN rail
KFD2-TT2-EX1: Thermocouple input isolator, 1-channel, mV signal, 4–20 mA output, Ex ia

Discrete / Digital I/O Modules

KFD2-SR2-EX1.W: Solenoid driver / switch amplifier, 1-channel, relay output, Ex ia, NAMUR input
KFD2-SR2-EX2.W: Solenoid driver / switch amplifier, 2-channel, relay output, Ex ia, NAMUR input
KFD2-DWB-EX2.D: Discrete input isolator, 2-channel, NAMUR/dry contact, transistor output
KFD2-SOT2-EX2: Solenoid output driver, 2-channel, 24 VDC output, Ex ia, short-circuit protected
KFD2-UFC-EX1.D: Universal frequency converter, 1-channel, pulse/frequency input, 4–20 mA output

Communication / Fieldbus Adapters

KFD2-HMM-EX1.179.179: HART multiplexer module, 1-channel, integrates with asset management systems
KFD2-BR-EX1.PA: PROFIBUS PA segment coupler / repeater, Ex ia, DIN rail mount

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