KFD2-STC4-Ex120 Pepperl+Fuchs

KFD2-STC4-Ex120 PEPPERL+FUCHS Controller module

Brand：Pepperl+Fuchs Model number：KFD2-STC4-Ex120

Country of origin: Germany Product weight：0.55kg

HS code：8517623990

Product Details：

Product Dimensions：

The KFD2-STC4-Ex120 is part of the K-System lineup from Pepperl+Fuchs, which is a modular signal conditioning system known for its space-saving design and reliability. It transfers an analog input signal from the hazardous area to the safe area while maintaining galvanic isolation. A key feature of this module is its ability to support HART communication, allowing digital signals to be superimposed on the 4 mA to 20 mA analog signal for remote configuration and diagnostics of field instruments.

Product Parameters

Power Supply: 20 V DC to 35 V DC via Power Rail or terminals 11 and 12.
Input Side (Hazardous Area): Terminals 1, 2, and 3. It supports 2-wire SMART transmitters and 3-wire SMART transmitters.
Input Signal Range: 4 mA to 20 mA.
Output Side (Safe Area): Terminals 7, 8, and 9.
Output Signal: 4 mA to 20 mA or 1 V to 5 V (depending on the terminal selection and load).
Galvanic Isolation: $2.5 \text{ kV}$ reinforced insulation between the input, output, and power supply according to EN 60079-11.
HART Compatibility: Bi-directional communication for SMART signals.
Transmission Error: Less than $20 \text{ µA}$ at $20 \text{°C}$ .
Ambient Temperature Range: $-20 \text{ °C}$ to $60 \text{ °C}$ ( $-4 \text{ °F}$ to $140 \text{ °F}$ ).
Mounting: 35 mm DIN mounting rail.

Product Advantages

Intrinsic Safety: It provides a robust barrier that limits energy to the hazardous area, preventing sparks or thermal effects that could ignite explosive atmospheres.
HART Transparency: The module allows for seamless integration of SMART field devices, enabling operators to perform remote calibration and asset management without needing to visit the field.
Versatile Configuration: It supports multiple wiring schemes (2-wire and 3-wire), making it highly adaptable to different transmitter types in the field.
High Reliability: Featuring excellent galvanic isolation and low drift, it ensures that the signal received by the control system is accurate and free from ground loop interference.
Easy Installation: The Power Rail compatibility significantly reduces wiring effort by providing the supply voltage directly through the DIN rail.

Important Considerations and Precautions

Hazardous Area Compliance: Ensure that the connected field devices match the intrinsic safety parameters (Entity Concept: $U_o$ , $I_o$ , $P_o$ ) of the KFD2-STC4-Ex120 to maintain the safety rating of the loop.
Proper Grounding: While the device provides galvanic isolation, the metal DIN rail should be properly grounded to ensure electromagnetic compatibility (EMC).
Power Supply Stability: Use a regulated 24 V DC power supply. Excessive voltage or spikes can damage the internal circuitry of the barrier.
Terminal Connections: Pay close attention to the terminal numbers. Improperly connecting the safe-area output to hazardous-area field wiring can bypass the safety barrier and create a dangerous situation.
Environmental Limits: Do not exceed the specified operating temperature. If installed in a closed cabinet with high-density modules, ensure adequate ventilation or spacing.

Product Applications

The KFD2-STC4-Ex120 is widely used in industries requiring explosion protection, such as Oil and Gas, Chemical processing, and Pharmaceuticals.

Transmitter Powering: Powering pressure, temperature, or level transmitters located in Zone 0, 1, or 2 hazardous areas.
Signal Isolation: Eliminating ground loops between field instruments and the DCS/PLC in the control room.
SMART Asset Management: Enabling centralized management of field devices via HART protocol for predictive maintenance and remote troubleshooting.
Refinery and Tank Farm Monitoring: Interfacing with sensors used for tank gauging or flow measurement where volatile vapors are present.

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