Description

Brief Product Description

The Pepperl+Fuchs KFD2-STC5-1 is a high-performance 1-channel transmitter power supply designed to provide regulated energy to SMART field instruments while ensuring superior galvanic isolation. It facilitates bidirectional HART communication and converts field signals into high-accuracy 4-20mA outputs for industrial control systems.

​High-Integrity Signal Isolation and Power Delivery

The Pepperl+Fuchs KFD2-STC5-1 serves as a critical link between field instrumentation and the control room by providing stable DC power to 2-wire and 3-wire SMART transmitters. This module eliminates ground loops and suppresses electrical noise through robust galvanic isolation, conforming to international safety standards. By maintaining an isolated current value throughout the transmission process, the device ensures that analog input signals remain accurate and reliable, even in environments prone to heavy electromagnetic interference.

Bidirectional Communication and HART Compatibility

A primary advantage of the KFD2-STC5-1 lies in its support for bidirectional digital communication. The module allows operators to superimpose HART, BRAIN, or Foxboro protocol signals onto the analog current loop without signal degradation. Furthermore, the unit features integrated test sockets specifically designed for field communicators. This allows technicians to perform diagnostics and calibration directly at the module. An internal 250-ohm resistor is also available for HART communication, providing flexibility for various control side configurations, including both sink and source modes.

Performance and Environmental Reliability

Engineered for efficiency, the KFD2-STC5-1 operates with remarkably low power dissipation—typically under 1W—which reduces heat buildup in crowded control cabinets. The device handles a wide input voltage range of 18V to 30V DC and delivers a precise 4-20mA output across loads up to 800 ohms. Its rapid signal response, characterized by 100µs rise times and a 200µs settling time, ensures that real-time process changes are reflected instantly in the PLC or DCS logic. These technical benchmarks make the KFD2-STC5-1 a preferred choice for fast-acting safety and control loops.

Key Technical Characteristics

• SMART Protocol Support: Facilitates seamless data exchange via HART and other digital protocols.
• Universal Input Compatibility: Interfaces effectively with 2-wire/3-wire transmitters and current sources.
• Superior Galvanic Isolation: Provides 300V basic insulation between input, output, and power supply.
• High Precision Output: Maintains signal deviation within 10µA for exceptional process accuracy.
• Efficient Thermal Management: Low power consumption extends the operational life of the module.
• Integrated Diagnostics: Features dedicated test sockets for simplified field-side troubleshooting.

Technical Specifications