Description
MTL F271-IS
Technical Specifications
- Product Type: Intrinsically safe fieldbus isolator
- Zone Suitability: For hazardous area Zone 0, Zone 1, Zone 2
- Isolation Voltage: High galvanic isolation between safe and hazardous side
- Bus Type: Fieldbus segment isolation
- Power Supply: 24VDC from safe side control cabinet
- Protection Rating: IP20
- Operating Temperature: -20 °C to +60 °C
- Certifications: ATEX, IECEx intrinsic safety certification
- Mounting: DIN rail mounting
Functional Features
- Galvanic isolation separates safe control cabinet side and hazardous fieldbus segment.
- Intrinsic safety energy limiting circuit restricts voltage and current entering hazardous zone.
- Supports multi-drop fieldbus connection for multiple fieldbus transmitters and actuators.
- Built-in short circuit protection for fieldbus segment.
- Bus diagnostic function detects fieldbus wiring fault and segment overload.
- LED indicators for power, bus run and fault status.
- Low signal attenuation preserves fieldbus communication quality.
- Surge suppression circuit protects against transient voltage surges.
- Compact DIN rail modular design for control cabinet installation.
- Complies with ATEX and IECEx standards for explosive atmosphere.
Application Scenarios
- Petrochemical plant fieldbus network intrinsic safety isolation
- Refinery hazardous area Foundation Fieldbus and Profibus PA system
- Offshore platform fieldbus instrument isolation
- Chemical reactor zone fieldbus instrument protection
- Tank farm fieldbus instrument safety barrier
Material Composition
- Housing: Flame-retardant thermoplastic plastic enclosure
- Main PCB: FR4 printed circuit board with conformal coating
- Isolation component: High isolation safety transformer
- Energy limiting circuit: Precision resistors and zener diodes
- Terminal block: Copper alloy spring cage terminals
- Status indicators: High brightness LED diodes
Structural Characteristics
- Standard DIN rail rectangular modular housing.
- Front panel fitted with LED status indicators.
- One side terminals for safe side control cabinet wiring.
- Opposite side terminals for hazardous area fieldbus wiring.
- Internal high isolation transformer separates safe and hazardous circuits.
- Rear spring clip for DIN rail mounting.
Working Principle 24VDC power supply from safe cabinet enters the isolator. The internal isolation transformer provides galvanic isolation between safe side and hazardous fieldbus segment. Energy limiting circuit limits maximum voltage and current delivered to hazardous zone to below ignition threshold of explosive gas mixture. Fieldbus communication signals pass through the isolation transformer with minimal distortion. Short circuit protection activates automatically when fieldbus segment short circuit occurs, cutting energy supply to hazardous side. Fault status is indicated by front panel LED.
Installation Requirements
- Mount isolator on DIN rail inside non-hazardous control cabinet.
- Separate hazardous side fieldbus wiring and safe side wiring, do not route in same cable tray.
- Use intrinsically safe approved shielded fieldbus cable for hazardous side wiring.
- Follow ATEX/IECEx installation rules for hazardous area instrument wiring.
- Verify maximum number of fieldbus devices per segment.
- Perform fieldbus segment load calculation before commissioning.
- Test bus communication and short circuit protection after installation.
Usage Notes
- Do not install this module inside explosive hazardous zone.
- Do not exceed certified voltage and current parameters for hazardous side circuit.
- Do not connect non-intrinsically safe equipment to hazardous side terminals.
- Check terminal tightness periodically.
- Keep cabinet free of corrosive gas and conductive dust.
- Do not modify internal circuit components.
- Re-verify intrinsic safety parameters after any fieldbus wiring modification.
