Pepperl+Fuchs KFU8-UFT-EX2.D Replacement for KFU8 Series

Product Overview

Pepperl+Fuchs KFU8-UFT-EX2.D Replacement for KFU8 Series: Seamless Transition & Legacy System Compatibility

The Pepperl+Fuchs KFU8-UFT-EX2.D is a dual-channel frequency converter and signal conditioner designed for use in hazardous-area automation systems. As legacy KFU8 Series installations age and original units reach end-of-life, plant engineers and procurement teams face increasing pressure to source verified replacements that maintain full wiring compatibility, preserve NAMUR sensor signal integrity, and avoid costly control-system redesigns. TOPNLMS stocks the KFU8-UFT-EX2.D as a direct drop-in replacement, fully tested, ready to ship, and backed by a 12-month warranty.

Whether you are managing a scheduled turnaround, responding to an unplanned failure, or executing a phased migration from an older Pepperl+Fuchs K-System or KFD2 Series barrier platform, the KFU8-UFT-EX2.D integrates into your existing DIN-rail cabinet without structural modification. Its compact 12.5 mm housing fits standard KFU8 Series slots, and its screw-terminal wiring layout mirrors the predecessor units your maintenance team already knows.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful migration to the KFU8-UFT-EX2.D rarely involves a single component. In practice, plant engineers replacing aging frequency converters also audit adjacent modules in the same control cabinet. The KFU8-UFT-EX2.D shares the KFU8 Series power bus, so if your KFU8-PS2.1D power supply module is also approaching end-of-life, it is efficient to replace both during the same maintenance window to avoid a second shutdown.

For installations where the field sensor wiring runs through a marshalling cabinet before reaching the barrier, KFU8-SOT2-Ex2.D solenoid driver modules and KFU8-SR2-Ex2.D switch amplifiers are commonly found in adjacent slots. These units share the same 12.5 mm DIN-rail footprint and bus connector, making a coordinated multi-module replacement straightforward. Your maintenance team can swap the entire row without disturbing field cable terminations.

On the PLC side, the transistor output of the KFU8-UFT-EX2.D connects directly to standard digital input cards. If your control system uses a Siemens S7-300 SM 321 or a Rockwell Allen-Bradley 1756-IB16 digital input module, no signal conditioning adapter is needed. For older systems still using relay-output barriers, a KFD2-SR2-Ex2.W switch amplifier can serve as an intermediate stage during a phased migration, allowing you to upgrade the hazardous-area side while deferring PLC I/O card changes.

Communication integrity across the upgraded system is maintained through NAMUR NE 107 diagnostics. If your asset management system uses a Pepperl+Fuchs FieldConnex Segment Coupler or a FOUNDATION Fieldbus H1 coupler for process data aggregation, the KFU8-UFT-EX2.D’s diagnostic outputs integrate without additional configuration. For sites running HART-enabled transmitters alongside frequency sensors, the KFU8 Series bus architecture supports mixed-module configurations, so HART pass-through modules such as the KFD2-HMM-16 can coexist in the same rack.

Where physical cabinet space is constrained — a common challenge in brownfield retrofits — the 12.5 mm width of the KFU8-UFT-EX2.D provides a measurable advantage over older 20 mm K-System modules. Engineers retrofitting a 24-slot cabinet can recover up to 90 mm of rail space by migrating from 20 mm predecessors, which may eliminate the need for a cabinet expansion entirely. Signal isolators such as the KFD2-UT2-Ex2.D can also be consolidated into the same rail if universal temperature input channels are required alongside frequency measurement.

Retrofit Guidance FAQ

Q: Can I reuse existing field wiring when replacing an older KFU8 frequency converter with the KFU8-UFT-EX2.D?
A: Yes. The KFU8-UFT-EX2.D uses the same screw-terminal pin assignment as standard KFU8 Series modules. Field cables connected to the predecessor unit can be transferred directly to the replacement without re-labeling or re-routing, provided the cable cross-section is within the 0.14–1.5 mm² range specified for the terminal block.

Q: Do I need to modify my PLC program after the swap?
A: In most cases, no. The KFU8-UFT-EX2.D preserves the same transistor output signal format and frequency range as its predecessors. If your PLC program uses frequency-to-engineering-unit scaling blocks, verify that the input frequency range parameter matches the new module’s 0–25 kHz capability. No changes to I/O addressing or function block types are typically required.

Q: Is the KFU8-UFT-EX2.D compatible with NAMUR sensors already installed in Zone 1 hazardous areas?
A: Yes. The module is rated Ex ia IIC and accepts standard NAMUR proximity sensors operating at 8.2 V / 8 mA. No changes to the field sensor, cable gland, or Ex-e junction box are required. The existing Ex ia loop certification remains valid.

Q: What communication protocols does the KFU8-UFT-EX2.D support for integration with DCS or SCADA systems?
A: The module outputs a transistor pulse signal compatible with standard digital input cards on all major DCS and PLC platforms. It does not require a fieldbus protocol at the module level. NAMUR NE 107 diagnostic status (wire break, short circuit) is available via the module’s LED indicators and can be wired to a separate digital input for alarm integration in your SCADA system.

Q: How much DIN-rail space does the KFU8-UFT-EX2.D require, and will it fit in my existing cabinet?
A: The module occupies 12.5 mm of DIN-rail width. If you are replacing a same-series KFU8 module, it is a direct physical fit. If migrating from a 20 mm K-System module, you will need to verify available rail space or consolidate adjacent modules to accommodate the new unit.

Q: Can the KFU8-UFT-EX2.D be powered from the existing KFU8 bus power supply?
A: Yes. The module draws power from the KFU8 Series bus via the bus connector. Ensure your existing KFU8-PS2.1D or equivalent power supply has sufficient current capacity for the additional load (typically 35 mA per module at 24 V DC).

Q: What is the lead time and shipping arrangement for the KFU8-UFT-EX2.D?
A: Units in stock ship from Xiamen within 1–3 business days. International express delivery (DHL / FedEx) typically reaches Europe and Southeast Asia within 3–5 business days. Air freight documentation including commercial invoice, packing list, and country-of-origin certificate (Germany) is provided with every shipment.

Warranty Assurance

Every KFU8-UFT-EX2.D unit supplied by TOPNLMS is covered by a 12-month warranty from the date of shipment. Prior to dispatch, each unit undergoes functional verification including input signal simulation, output frequency measurement, power bus connectivity check, and LED diagnostic confirmation. Units that do not pass all test criteria are quarantined and not shipped.

In the event of a warranty claim, TOPNLMS provides a replacement unit or full refund at the buyer’s election. Return shipping for confirmed defective units is covered by TOPNLMS for orders within the warranty period. Our after-sales response target is 24 hours for initial acknowledgment and 72 hours for resolution proposal.

For procurement teams requiring documentation, we provide: original manufacturer datasheet, test report, commercial invoice with HS code 8533.40 (signal conditioners / isolators), packing list, and certificate of origin (Germany). Letter of credit and TT payment terms are both accepted. Bulk order pricing is available for quantities of 5 units or more.

For urgent replacement inquiries, contact our technical sales team directly:

• Email: [email protected]
• Phone / WhatsApp: +86 18359293191
• Website: https://topnlms.com

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