Description of the KFD2-UFC-EX1 FREQUENCY CONVERTER by Pepperl Fuchs

Introduction:

• The KFD2-UFC-EX1.D is a high-performance frequency converter designed for intrinsically safe applications in hazardous environments, such as the oil and gas industry.
• This device transforms digital signals from NAMUR sensors or dry contacts into an accurate analog output of 0/4 mA to 20 mA, with integrated setpoint values and line failure detection to maximize process reliability.

Technical Features

• Type: Universal single-channel frequency converter
• Power Supply: 20-35 V CC (typically 24 V CC)
• Input Signal: Configurable (e.g., 0-20 mA, 4-20 mA)
• Output Signal: Configurable (e.g., 0-20 mA, 0-10 V)
• Intrinsic Safety Certifications: ATEX, IECEx, FM, cUL
• Safety Integrity Level (SIL): SIL 2 according to IEC/EN 61508/61511
• Input Frequency Range: 1 mHz to 5 kHz
• Multiple Switch Outputs: 2 relays and 1 potentially isolated transistor output
• Integrated Line Failure Detection (LFD): Monitors interruptions and short circuits
• Overload Function: 1 to 1000 seconds, adjustable in steps of 1 second
• Collective Error Output: Through the power rail

Advantages

• International Certifications: ATEX, IECEx, FM/UL/cUL for use in explosive atmospheres.
• Easy Configuration: Via a front key or PACTware software.
• SIL 2 Compliance: Meets the functional safety standards IEC/EN 61508/61511 for critical operations.

Recommended Applications or Uses

• Process Automation: Ideal for applications requiring a secure and precise transmission of digital signals to field devices in hazardous areas.
• NAMUR Sensors or Dry Contacts: Allows integration with sensors.