Intrinsic Safety Barrier (Isolated Type)
Explosion-Proof Signal Isolation Device for Hazardous Areas – Ensure Safe Signal Transmission & System Reliability
Product Overview
Our isolated intrinsic safety barrier is a critical explosion-proof interface device designed for industrial automation systems deployed in explosive gas or dust hazardous atmospheres. Installed on the safe-area control room side, it strictly limits the electrical energy delivered to field instruments in hazardous zones to a level below the ignition threshold of explosive mixtures, realizing intrinsic safety type explosion protection.
Adopting advanced galvanic isolation technology, it integrates three functions: energy limitation for explosion protection, signal conditioning and ground loop interference elimination. It is fully compatible with various intrinsically safe field devices including pressure transmitters, temperature sensors, solenoid valves and proximity switches. Widely applied in petrochemical, pharmaceutical, mining, oil & gas and other high-risk industries, it builds a safe, stable signal transmission bridge between on-site hazardous areas and control room PLC/DCS systems.
Core Features
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Intrinsic Safety Protection with Strict Energy Limitation
Built with precision energy-limiting circuits, the barrier strictly restricts the output voltage, current and total power to the hazardous area within the safe ignition range, complying with international intrinsic safety explosion protection standards. It fundamentally prevents electrical sparks and excessive thermal effects from igniting explosive gas mixtures, and is applicable for Zone 0/1/2 hazardous areas with Class IIC explosive gases, providing essential safety guarantee for on-site production and personnel.
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Triple Galvanic Isolation for Dual Safety & Anti-Interference
It achieves complete three-terminal electrical isolation among input, output and power supply. While fulfilling explosion protection functions, it effectively eliminates ground loop interference and common-mode noise in the system. Unlike zener barriers, it does not require dedicated high-reliability grounding, which simplifies on-site wiring, improves system stability, and also protects control system I/O cards from on-site surge and electrical damage.
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Rich Signal Compatibility & Flexible Configuration
Supports full-range mainstream industrial signal types: 4-20mA analog signals, switch/digital signals, RTD/thermocouple temperature signals and RS485 communication signals. It can provide loop power supply for field intrinsically safe instruments, integrating power supply, isolation and explosion protection in one unit. Multiple channel configurations such as 1-in-1-out and 1-in-2-out are available to flexibly match different system architecture requirements.
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Comprehensive Protection & Fault-Oriented Safety Design
Built-in over-voltage, over-current and reverse polarity protection effectively prevents device damage caused by wiring errors and abnormal grid conditions. Even if a fault occurs on the safe-area side, the energy output to the hazardous area always remains within the specified safe range, ensuring no ignition risk at the hazardous site and fully safeguarding on-site equipment and personnel safety.
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Compact Modular Design for Easy Installation & Maintenance
Adopts standard DIN rail mounting with an ultra-slim modular body, greatly saving internal space of control cabinets. The standardized terminal layout enables quick on-site wiring. With a fully solid-state structure and no mechanical moving parts, it features an extra-long service life and almost no routine maintenance, adapting to long-term continuous operation in industrial environments.
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High EMC Performance for Harsh Industrial Scenarios
With optimized electromagnetic compatibility design, it effectively suppresses on-site electromagnetic interference generated by variable frequency drives, high-power motors and other equipment. It maintains stable and accurate signal transmission even in workshops with complex electromagnetic environments, ensuring reliable data interaction between the hazardous area and the control system.
Technical Specifications
- Explosion protection grade: Ex ia IIC T6 Ga (typical, customizable)
- Isolation structure: Triple isolation (input / output / power supply)
- Isolation withstand voltage: ≥ 2500V AC / 1min
- Input signal types: 4-20mA analog, switch signal, RTD/thermocouple, RS485 (Modbus RTU)
- Output signal types: 4-20mA analog, transistor/relay output, RS485 (Modbus RTU)
- Power supply: DC 24V (standard)
- Operating ambient temperature: -20℃ ~ +60℃
- Installation: Standard DIN rail mounting
- Protection grade: IP20 (indoor cabinet installation)
- Applicable hazardous zones: Zone 0 / Zone 1 / Zone 2, Class IIC explosive gas atmosphere
Typical Applications
- Signal transmission and explosion protection for field instruments in petrochemical, oil refining and chemical production plants
- Gas monitoring and intrinsically safe control systems in coal mines, tunnels and underground engineering
- Explosion-proof automation systems for pharmaceutical workshops, pesticide production and fine chemical industries
- Safety control of solenoid valves and sensors in oil & gas extraction, storage and transportation scenarios
- Explosion-proof control for paint, coating and flammable liquid production lines
- Matching with DCS/PLC control systems to build compliant and reliable hazardous area monitoring solutions
All intrinsic safety barriers undergo strict factory calibration, insulation withstand test and explosion-proof performance verification before delivery. We provide customized solutions for special signal types, channel configurations and explosion-proof grades, along with professional technical support for system scheme design and on-site commissioning, helping you build a safe, stable and compliant industrial explosion-proof automation system.
