Description

Pepperl+Fuchs KFD2-STC4-Ex2 Product Description

Technical Specifications

• Product Model: KFD2-STC4-Ex2
• Brand: Pepperl+Fuchs
• Warranty: One Year
• Input Voltage: 24 VDC nominal supply voltage (operating range 19.2 VDC ~ 31.2 VDC)
• Operating Temperature: -20°C to +60°C
• Storage Temperature: -40°C to +85°C
• Response Time: ≤150 μs signal transmission delay per channel
• Protection Class: IP20 for DIN rail cabinet installation
• Accuracy Class: 0.05% full scale signal transfer accuracy
• Output Frequency: 0–10 kHz input signal processing bandwidth
• Rated Current Range: Max 115 mA total power consumption
• Communication Interface: Screw-clamp field wiring terminals, standard TH35 DIN rail base
• Supported Protocols: Passive 4–20 mA analog loop transmission, intrinsically safe signal conditioning
• Overload Capacity: 250 VAC isolation test voltage between hazardous and safe side
• Dimensions: 126 mm (H) × 12.5 mm (W) × 115 mm (D), 6 mm narrow housing width
• 

Product Overview

The KFD2-STC4-Ex2 is a two-channel intrinsically safe isolated barrier and smart transmitter power supply module from Pepperl+Fuchs K-System series, designed to form the safety interface between 2-wire 4–20 mA field transmitters located in explosive hazardous areas and the safe-side DCS/PLC control system. This module provides regulated loop power for field sensors such as pressure, temperature, flow and level transmitters, while limiting voltage, current and energy fed into Zone 0/1 hazardous locations to meet intrinsic safety explosion protection requirements.

It resolves critical risks in hazardous process industries, including excessive electrical energy triggering ignition of flammable gas, vapor or dust mixtures, ground loop interference causing drifting analog readings, transient surge damage to expensive plant control cards, and non-compliant barrier configurations failing third-party safety audits. Each channel features full galvanic isolation between the safe control cabinet side and field hazardous side, effectively blocking common-mode noise and voltage spikes induced by frequency converters, large motors and high-voltage switchgear in process plants.