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HIMA KFD2-STC4-Ex1 – Intrinsic Safety Isolated Barrier
Product Overview
The HIMA KFD2-STC4-Ex1 is a 1-channel intrinsic safety isolated barrier designed for hazardous industrial environments. It supplies power to 2-wire and 3-wire smart transmitters in explosive areas, while isolating and transferring analog signals (0/4-20 mA) to safe areas. This device solves critical challenges in process industries, such as preventing electrical sparks in hazardous zones and ensuring accurate signal transmission between field and control systems, making it suitable for oil, gas, chemical, and pharmaceutical facilities.
Technical Specifications — KFD2-STC4-Ex1
| Parameter | Value |
|---|---|
| Product Model | KFD2-STC4-Ex1 |
| Manufacturer | HIMA |
| Product Type | 1-Channel Intrinsic Safety Isolated Barrier |
| Power | 20-35 VDC (power rail or terminal connection), 1.8 W power consumption |
| Communication / Protocol | Bi-directional digital signal transfer, HART compatible |
| Operating Temperature | -20 °C to +60 °C |
| Mounting | 35 mm DIN mounting rail (per EN 60715:2001) |
| Dimensions (HxWxD) | 124 mm x 20 mm x 115 mm |
| Weight | Approx. 200 g |
| Typical Interfaces | Screw terminals with test points, field/control side connections |
| Compliance | SIL 2 (IEC/EN 61508), ATEX, UL 61010-1, IEC 60529 (IP20) |
HIMA KFD2-STC4-Ex1
Key Features and Benefits — KFD2-STC4-Ex1
- Provides intrinsic safety protection for hazardous zones, preventing electrical hazards in areas with explosive gases, vapors, or dust.
- Transfers 0/4-20 mA analog signals with high accuracy (≤10 µA deviation at 20 °C) and low ripple (max. 50 µA rms).
- Integrates test sockets for HART communicators and internal 250 Ω resistance for low-loop resistance scenarios.
- Galvanic isolation between output and power supply ensures signal purity and protects control systems from field-side interference.
- Compact design and DIN rail mounting save cabinet space, simplifying integration into existing industrial setups.
Related Models
- KFD2-STC4-Ex2: 2-channel variant of the isolated barrier, suitable for multiple transmitter setups in hazardous areas.
- KFD2-STC5-Ex1: Replacement model for KFD2-STC4-Ex1, with enhanced functionality and compatibility.
- KFD2-STC4-Ex1.H: HART-optimized variant, offering improved digital signal transfer for smart transmitters.
- KFD2-STC4-Ex1.2O.H: 1-input, 2-output model, ideal for signal splitting in complex control systems.
Installation and Maintenance — KFD2-STC4-Ex1
- Mount on a standard 35 mm DIN rail, ensuring adequate spacing from adjacent equipment for heat dissipation.
- Wire field-side connections to terminals 1+, 2-, 3 (or 5-, 6+) and control-side to 7-, 8+, 9, following intrinsic safety guidelines.
- Regular maintenance involves checking terminal connections, verifying signal accuracy, and inspecting LED status indicators.
- Test HART communication via integrated test points to ensure bi-directional signal transfer works properly.
- Spare parts are available for legacy systems, though the model is discontinued and replaced by KFD2-STC5-Ex1.
