Pepperl+Fuchs KFD2-STC5-Ex1 SMART Transmitter Power Supply

Technical Overview

1-channel isolated barrier for 2-wire/3-wire SMART transmitters. Provides intrinsic safety for 4-20mA signals with HART communication, SIL 2 compliant.

Key Features

1-channel isolated barrier for analog input signals.
24 V DC supply via Power Rail or terminals 14+, 15-.
Input for 2-wire and 3-wire SMART transmitters and 2-wire SMART current sources.
Output 4 mA ... 20 mA current sink/current source.
Supports bi-directional HART communication.
Terminals with integrated test points.
Up to Safety Integrity Level (SIL) 2 according to IEC/EN 61508.
Galvanic isolation between input/output/power.
Compact 20 mm housing width for high-density DIN rail mounting.
Suitable for installation in hazardous areas: Zone 0, 1, 2 and Division 1, 2.

Technical Specification Matrix

Parameter	Value
Signal Type	Analog input
Safety Integrity Level (SIL)	SIL 2
Systematic Capability (SC)	SC 3
Supply Connection	Power Rail or terminals 14+, 15-
Rated Voltage (Ur)	18 ... 30 V DC
Input Signal	0/4 ... 20 mA
Output Signal	4 ... 20 mA current sink/current source
Power Dissipation	≤ 1 W at maximum load
Power Consumption	≤ 1.6 W at maximum load
Ambient Temperature	-20 ... 70 °C (-4 ... 158 °F)
Degree of Protection	IP20
Mounting	35 mm DIN mounting rail acc. to EN 60715:2001
Internal Resistor	250 Ω (for HART communication)
Physical Weight (kg)	0.15
Dimensions L x W x H (cm)	11.5 x 2 x 12.4

Industrial Applications

1. Hazardous Area Process Monitoring in Oil & Gas

This module enables safe and reliable transmission of 4-20 mA signals from SMART pressure, temperature, or flow transmitters located in Zone 0, 1, or 2 hazardous areas (e.g., oil refineries, gas processing plants) to control systems in the safe area. The intrinsic safety design prevents ignition in potentially explosive atmospheres.

Problem Solved

Ensures signal integrity and prevents explosions by isolating non-intrinsically safe control systems from field devices in explosive gas/dust environments, crucial for continuous process monitoring and control.

Intrinsic SafetyHazardous AreaZone 0/1/24-20mAHART CommunicationProcess ControlExplosion Protection

2. Chemical Plant Safety Instrumented Systems (SIS)

Integrated into Safety Instrumented Systems (SIS) in chemical plants, the KFD2-STC5-Ex1 provides an SIL 2 rated interface for critical process variables. It ensures that signals from field instruments (e.g., emergency shutdown valves, level sensors) located in hazardous zones are transmitted safely and reliably to the safety PLC, supporting functional safety requirements.

Problem Solved

Provides a high-integrity, SIL 2 compliant barrier for safety-critical measurements in chemical processing, preventing potential safety incidents by ensuring accurate and isolated signal transmission from hazardous to safe areas.

Safety Instrumented System (SIS)SIL 2Functional SafetyChemical ProcessingIsolated BarrierHART Communication

3. Remote Diagnostics and Asset Management in Petrochemical Facilities

The bi-directional HART communication capability of the KFD2-STC5-Ex1 allows for remote diagnostics, configuration, and asset management of SMART field devices (e.g., Coriolis flow meters, pH sensors) installed in petrochemical hazardous areas from a control room. This minimizes the need for personnel entry into dangerous zones, enhancing safety and operational efficiency.

Problem Solved

Facilitates remote monitoring and maintenance of instruments in hazardous petrochemical environments through HART communication, reducing personnel exposure to danger and streamlining commissioning and calibration.

HART CommunicationRemote DiagnosticsAsset ManagementPetrochemicalSMART TransmittersHazardous Area Maintenance