Pepperl Fuchs KFD2-STC4-1 SMART Transmitter Power Supply

Description Does your control system struggle to maintain digital communication with field instruments over long cable runs? The Pepperl Fuchs KFD2-STC4-1 is a high-performance signal conditioner designed specifically for SMART transmitters. Unlike basic isolators, this module provides a transparent communication path for HART protocols, allowing you to perform remote diagnostics and calibration while maintaining a clean, isolated 4–20 mA analog signal for your PLC or DCS. Inventory Status and Commercial Logistics Product Condition: New Original (Factory Sealed). Availability: High stock levels maintained for immediate global dispatch. Lead Time: Ships within 1 to 2 business days via express air freight. Warranty Protection: Full 12-month standard industrial warranty from the date of shipment. Commercial Note: While this is a high-volume component, market pricing fluctuates based on global semiconductor availability and shipping surcharges. The listed price is a reference; request a formal quote for current pricing and bulk discounts.   Technical Specifications and Field Parameters In field deployments across the oil and gas and chemical sectors, the KFD2-STC4-1 is the go-to solution for powering 2-wire transmitters where galvanic isolation is required to eliminate ground loops. Core Electrical Specifications Parameter Technical Value Model Designation KFD2-STC4-1 Input Signal 4 mA to 20 mA (SMART/HART compatible) Output Signal 4 mA to 20 mA (Active or Passive) Transmitter Supply \ge 16 V at 20 mA Supply Voltage 19 V DC to 30 V DC (via Power Rail or Terminals 11 , 12-) Accuracy < 0.1% of full scale Isolation 3-port (Input / Output / Power) HART Transparency Bidirectional (0.5 Hz to 40 kHz) Integrated Functional Capabilities The “STC” (Signal Transformer Current) series is engineered for transparency and safety. HART Communication: The module acts as a bridge for the 1.2 kHz and 2.2 kHz frequency-shift keying (FSK) signals used by HART. This allows your handheld communicator or asset management system (AMS) to “see” through the isolator to the field device. Low Power Dissipation: Modern circuitry in the STC4 revision reduces heat buildup, which is critical when mounting multiple units side-by-side in high-density cabinets. Active/Passive Output: You can configure the output to provide power (Source) or to act as a variable resistor (Sink), depending on whether your PLC card provides its own loop power.   Global Procurement and Customs Compliance Notes As a critical component in industrial automation, the KFD2-STC4-1 is subject to international trade compliance standards to ensure smooth delivery. Export Controls and Regulatory Data US ECCN: EAR99 HS Code: 85437090 (Electrical apparatus with individual functions) Safety Ratings: SIL 2 (IEC/EN 61508) rated for use in safety-instrumented systems. Country of Origin: Typically Germany or Singapore; verified on the physical unit for Certificate of Origin (COO) documentation. Logistics and Shipping Options We process international orders under FCA (Free Carrier) or DAP (Delivered at Place) terms. For urgent facility repairs, we utilize DHL or FedEx international priority. The unit weighs approximately 150 g, making it cost-effective for bulk air transport. We use specialized ESD-safe packaging to ensure the internal components are protected from static discharge during high-altitude transit.   Engineering Notes for Field Deployments Important Configuration Note: The KFD2-STC4-1 features side-mounted DIP switches to select between Sink and Source output modes. If you connect a “Source” output to a PLC card that also provides 24 V power, you run a high risk of damaging the input channel or the isolator’s output stage. Always verify the input type of your control system before power-up. Well, technically the module is rated for 4–20 mA, but it can actually pass signals up to 21.5 mA to comply with NAMUR NE43 fault signaling standards. To be frank, if you aren’t using the Power Rail for fault signaling, you should still consider using the UPR-03 rail simply to simplify your 24 V DC distribution, as it eliminates dozens of small jumper wires. On a recent project in a petrochemical facility, we found that field technicians were grounding the transmitter loop at the field junction box. This effectively bypassed the module’s 2.5 kV isolation. For the KFD2-STC4-1 to function correctly as a ground-loop eliminator, the field side must remain “floating” relative to the control room ground.   Frequently Asked Questions Can the KFD2-STC4-1 be used in intrinsically safe (Ex) applications? No. This module is a “Signal Conditioner” for non-hazardous areas. If your transmitter is located in a Zone 0, 1, or Class I Div 1 area, you must use the “Ex” version, which is the KFD2-STC4-Ex1. Does this module support 3-wire or 4-wire transmitters? The KFD2-STC4-1 is primarily designed to power 2-wire transmitters. While it can be wired to handle 3-wire devices by using terminals 1, 2, and 3, it is not the ideal module for 4-wire (self-powered) devices. For 4-wire signals, a dedicated isolator like the KFD2-CRG2-1 is generally more appropriate. How do I request a formal pro forma invoice for my project? Submit your inquiry with the total quantity and the full destination address. Our global trade experts will generate a comprehensive quote including international freight costs, estimated transit times, and all necessary HTS codes for your customs broker. Are you planning to utilize a HART handheld communicator through this module for remote calibration? PEPPERL FUCHS 2082|Industrial Signal Converter PEPPERL FUCHS 2108HAT|Fieldbus Isolator and Signal Converter Pepperl Fuchs KFD2-CR4-1-2O Transmitter Power Supply