Product Overview

The Pepperl+Fuchs KFD2-UT2-Ex1 serves as a high-precision universal temperature converter designed to bridge hazardous area field signals with safe area control systems. This single-channel isolated barrier processes a diverse range of inputs, including resistance temperature detectors (RTD), thermocouples, potentiometers, and voltage signals, converting them into a linearized 0/4 mA ... 20 mA analog output. In the context of large-scale rotating machinery like steam turbines and compressors, the KFD2-UT2-Ex1 provides critical thermal monitoring for bearings and lubricants, preventing catastrophic mechanical failure through early detection of overheating. Its high-resolution signal processing and galvanic isolation eliminate ground loops and electromagnetic interference, ensuring that your DCS or PLC receives the most accurate thermal data available from the field.

Core Technical Advantages

This module features a highly flexible input architecture that allows engineers to standardize on a single barrier for various sensor types, significantly reducing spare parts inventory. The KFD2-UT2-Ex1 utilizes the PACTware configuration software, enabling precise digital calibration and parameterization of sensor limits, cold junction compensation, and burnout behaviors. The hardware supports both sink and source modes for its current output, offering seamless compatibility with any control system input card. Furthermore, the unit incorporates active Line Fault Detection (LFD) and sensor burnout monitoring, which automatically drives the output to a predefined safety value if a field wire breaks or a sensor fails. Its SIL 2 certification ensures that this converter meets the rigorous safety requirements of modern industrial processes and functional safety protocols.

Technical Specifications

Installation Guide

Engineers should install the KFD2-UT2-Ex1 on a 35 mm DIN rail, ideally utilizing the K-System Power Rail to minimize individual wiring for the 24V DC supply. When using thermocouples, ensure that the cold junction compensation mode is correctly set in PACTware—internal compensation requires the use of the K-CJC-** terminal block for maximum precision. Maintain a minimum bending radius for specialized thermocouple extension wires to avoid signal degradation. For 3-wire or 4-wire RTD configurations, utilize the dedicated terminals to automatically compensate for lead resistance, ensuring the measurement remains independent of cable length. Always isolate hazardous area cables from power lines with at least 50mm of clearance to maintain the intrinsic safety rating.

Engineering Advantages

The KFD2-UT2-Ex1 excels in extreme industrial environments by maintaining its calibration stability despite fluctuations in ambient temperature or power supply noise. Its galvanic isolation protects high-value PLC input cards from high-voltage transients that can occur in industrial plant floors. The module's ability to process potentiometer inputs makes it uniquely suited for valve position feedback and other displacement sensing tasks in hazardous zones. By integrating SIL 2 reliability into a compact 20mm housing, this converter provides a high-density solution for safety-instrumented systems (SIS) without compromising on signal integrity or diagnostic transparency.

Delivery & Logistics

Delivery Time: 3-5 days once payment is finalized.

Shipping Carriers: Shipped globally via DHL, FEDEX, or UPS. We utilize anti-static packaging for all shipments to guarantee that the electronics arrive in perfect operational condition.

Technical FAQs

Q1: Can I configure the KFD2-UT2-Ex1 without the PACTware software?

A1: No, this module requires PACTware and a K-ADP-USB adapter for full configuration of sensor types, measuring ranges, and fault behavior. This digital approach ensures higher accuracy compared to traditional DIP-switch settings.

Q2: Does this module support 2-wire, 3-wire, and 4-wire RTD connections?

A2: Yes, the KFD2-UT2-Ex1 provides terminals for all three RTD wiring methods. We recommend 3-wire or 4-wire connections for long-distance runs to eliminate error caused by cable resistance.

Q3: How does the "Burnout Detection" feature protect my system?

A3: If a thermocouple or RTD wire breaks, the LFD circuitry detects the open circuit and forces the 4-20mA signal to a high (>21mA) or low (<3.6mA) fault value. This allows your PLC to trigger an alarm immediately rather than acting on a "frozen" or floating measurement.

Q4: Is the KFD2-UT2-Ex1 compatible with both active and passive PLC input cards?

A4: Yes. The module's output can be configured for "Source" mode (providing its own loop power) or "Sink" mode (using power provided by the PLC card), ensuring total flexibility during system integration.