Pepperl+Fuchs KFD2-UFC-1.D Universal Frequency Converter
The Pepperl+Fuchs KFD2-UFC-1.D is a universal frequency converter (signal conditioner) designed for industrial automation and process control applications. It converts frequency signals from NAMUR sensors, 2/3-wire sensors, or dry contacts into a standard analog output (0/4-20 mA) and provides relay/transistor switching outputs. Certified for SIL 2 per IEC 61508, it is suitable for safety-related applications in hazardous areas.
Technical Specifications
Product Type: 1-channel universal frequency converter
Input Frequency Range: 1 mHz to 12 kHz (0.001 to 12000 Hz)
Input Types: NAMUR sensors (EN 60947-5-6), 2-wire/3-wire sensors, mechanical dry contacts
Open Circuit Voltage/Short-circuit Current: 22 V / 40 mA
Input Resistance: 4.7 kΩ
Switching Point/Hysteresis: Logic 1: >2.5 mA; Logic 0:<1.9 mA
Minimum Pulse Duration: >50 μs
Line Fault Detection: Breakage I ≤0.15 mA; Short-circuit I >4 mA
Output I & II: Relay outputs (250 V AC / 2 A, cos φ ≥0.7; 40 V DC / 2 A)
Output III: Electronic transistor output, passive (40 V DC, 50 mA)
Output IV: Analog output (0/4-20 mA, max load 650 Ω)
Resolution (Analog):<10 μA
Accuracy (Analog):<20 μA
Measuring Time:<100 ms
Accuracy (Frequency): 0.1% of measured value (≥0.001 Hz)
Rated Voltage: 20-30 V DC (Power Rail compatible)
Rated Current: approx. 100 mA
Power Dissipation/Consumption: ≤2 W / 2.2 W
Operating Temperature: -20°C to +50°C
Dimensions: 40 mm × 119 mm × 115 mm (W×H×D)
Safety Integrity Level: SIL 2 acc. to IEC 61508
Certifications: CE, UL, ATEX, IECEx (Zone 2)
Configuration and Functions
The KFD2-UFC-1.D features flexible configuration via PC or control panel. Each output can be individually parameterized with trip values (high/low alarms), serially switched output modes, pulse divider functions, or error message outputs. The device includes start-up override (1 to 1000 seconds), restart inhibit, debounce filter, and comprehensive line fault detection (LFD) for sensor breakage and short-circuit conditions. The analog output (0/4-20 mA) is linearly proportional to the input frequency and supports NAMUR NE43 fault signaling (downscale ≤3.6 mA, upscale ≥21.5 mA).
Application Domains
The KFD2-UFC-1.D is ideal for frequency monitoring of rotating machinery (speed monitoring of conveyors, pumps, fans), flow measurement (turbine flowmeters), counting applications, and position sensing. Its SIL 2 certification makes it suitable for safety instrumented systems (SIS) requiring reliable frequency-to-analog conversion. The device is compatible with Pepperl+Fuchs Power Rail for simplified power distribution and is widely used in chemical, petrochemical, oil & gas, and power generation industries.
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