Pepperl Fuchs KFD2-STV4-Ex1-1 Isolated Voltage Transmitter Power Supply

Description Are you struggling with signal attenuation or common-mode noise when transmitting 0–5 V or 0–10 V signals from a hazardous area to your control room? The KFD2-STV4-Ex1-1 is a high-precision intrinsically safe (IS) barrier designed specifically for voltage-output sensors. It provides a stabilized power supply to field transmitters located in Zone 0 or Class I, Div 1 environments and transfers the resulting voltage signal across a 2.5 kV galvanic isolation barrier. Unlike standard current-loop barriers, this module is optimized to maintain high impedance on the input to prevent loading down sensitive voltage-based instruments. Inventory Status and Commercial Logistics Product Condition: New Original (Factory Sealed). Availability: In stock at global distribution hubs. Lead Time: 1 to 2 business days for international dispatch. Warranty Protection: 12-month standard industrial warranty. Commercial Note: Because voltage-output barriers are more specialized than standard 4–20 mA units, spot-market availability can fluctuate. The listed price is a reference; request a formal quote for current pricing and lead-time confirmation. Technical Specifications and Safety Parameters In field deployments involving gas analysis or specialized pressure transducers, the “STV” series is the standard for maintaining signal linearity across the isolation barrier. Core Electrical and Safety Specifications Parameter Technical Value Model Designation KFD2-STV4-Ex1-1 Input (Hazardous Side) 0/1 V to 5 V or 0/2 V to 10 V Output (Safe Side) 0/1 V to 5 V or 0/2 V to 10 V (1:1 Transfer) Transmitter Supply $\ge$ 12.9 V at 15 mA Supply Voltage 19 V DC to 30 V DC (via Power Rail or Terminals) Input Impedance $\ge$ 10 M$\Omega$ Isolation Barrier 3-port (Input / Output / Power) Safety Integrity Level SIL 2 (IEC/EN 61508) Intrinsically Safe Marking [Ex ia Ga] IIC, [Ex ia Da] IIIC, [Ex ia Ma] I Integrated Functional Capabilities This module provides a secure bridge for voltage-based data without the risk of energy transfer into explosive atmospheres. Voltage Ratio Accuracy: The module maintains a 1:1 transfer ratio with exceptional linearity. Honestly, if you are seeing a drop in voltage at the PLC, it is almost always due to the safe-side load impedance being too low rather than a fault in the barrier. Power Rail Integration: Supports the UPR-03 Power Rail, which allows for centralized power distribution and collective error messaging. If the field wiring shorts, the module can signal a fault to the DCS via the rail’s internal bus. Galvanic Isolation: The 3-port isolation eliminates ground loops between the field instrument, the PLC input card, and the 24 V DC power system. Global Procurement and Customs Compliance Notes Shipping intrinsically safe equipment like the KFD2-STV4-Ex1-1 requires careful adherence to international safety and trade standards. Regulatory and Trade Classifications US ECCN: EAR99 HS Code: 85437090 (Electrical apparatus with individual functions) Certification Documentation: ATEX, IECEx, and UL certificates are available. We provide these with every shipment to ensure your local inspectors can sign off on the installation without delay. Country of Origin: Usually Germany or Singapore; check the module side-label for exact Certificate of Origin (COO) verification. Logistics and Shipping Options We offer FCA (Free Carrier) and DAP (Delivered at Place) terms for all international orders. For critical facility repairs, we utilize priority air services (DHL/FedEx). At a net weight of approximately 150 g, these modules are cost-effective for bulk air transport. We utilize specialized ESD-safe and shock-resistant packaging to ensure the internal safety-limiting components remain within factory calibration during high-altitude transit. Engineering Notes for Field Deployments Critical Safety Warning: The blue terminals (1-3) are the intrinsically safe side. You must maintain a minimum of 50 mm clearance between the blue IS wiring and the non-IS (green) wiring. Mixing these wires in the same ducting can bypass the safety protection and lead to an ignition risk in the hazardous area. Well, technically the module supports up to 10 V output, but to be frank, voltage signals are far more susceptible to electromagnetic interference (EMI) than 4–20 mA loops. In our experience, if your cable run from the barrier to the PLC is longer than 10 meters, you should use shielded twisted-pair cabling and ground the shield at the cabinet end to prevent signal “ghosting.” On a recent project involving hydrogen storage sensors, we found that field technicians were attempting to use this module for a 4-wire transmitter. While it can work, the KFD2-STV4-Ex1-1 is specifically optimized to provide power to the transmitter via terminals 1 and 3. If your transmitter has its own power source, you must ensure it does not back-feed voltage into the barrier, or you risk blowing the internal safety fuses. Frequently Asked Questions What is the difference between the STV4 and the STC4? The STC4 is for current signals (4–20 mA), while the STV4 is for voltage signals (0–5 V or 0–10 V). They are not interchangeable. Connecting a 4–20 mA signal to an STV4 input will likely result in a saturated output and incorrect data. Can I adjust the output range on the module? No. The KFD2-STV4-Ex1-1 is a 1:1 transfer barrier. If you put in 2 V, you get 2 V out. Any scaling or ranging must be handled at the sensor (field side) or in the PLC/DCS software. How do I request a formal pro forma invoice for my project? Submit your inquiry with the required quantity and your full delivery address. Our global trade team will provide a comprehensive quote, including HTS codes, estimated freight costs, and transit times, within one business day. What is the specific input voltage range of the sensor you are looking to isolate? PEPPERL FUCHS 2082|Industrial Signal Converter PEPPERL FUCHS 2108HAT|Fieldbus Isolator and Signal Converter Pepperl Fuchs KFD2-CR4-1-2O Transmitter Power Supply Pepperl Fuchs KFD2-STC4-1 SMART Transmitter Power Supply