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January 15, 2026
Category Connection: MTL Safety Barrier
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Tags:
#mtl safety barrier #mtl barriers #repeater power supply
Brief: Get an inside view of features that deliver consistent results in daily use. This video provides a detailed walkthrough of the MTL 4851 Loop-Powered Isolator, demonstrating its operation in hazardous area applications. You'll see how this 2-wire, 4-20mA isolator provides 1:1 signal isolation while being powered directly from the loop, and learn about its FM/ATEX/IECEx certifications for Zone 1 environments.
Related Product Features:
  • Loop-powered operation requiring no separate power supply, drawing energy directly from the 4-20mA signal.
  • Ultra-low voltage drop of only 5.0V at 20mA maximizes available loop voltage for system efficiency.
  • Provides 1:1 galvanic isolation between field and control systems to protect against ground loops and interference.
  • FM, ATEX, and IECEx certified for intrinsic safety applications in Zone 1 hazardous locations.
  • Wide operating temperature range from -40°C to +70°C for extreme environment applications.
  • High accuracy of ±0.1% ensures precise signal transmission for critical process control.
  • Fast response time of <50ms supports dynamic applications requiring quick signal processing.
  • Compact 12.5mm width design enables high-density DIN rail installations in space-constrained panels.
FAQs:
  • What certifications does the MTL 4851 isolator have for hazardous area use?
    The MTL 4851 carries FM, ATEX, and IECEx approvals for Zone 1 hazardous locations, making it suitable for international applications in explosive atmospheres with gas groups IIC and temperature class T6.
  • How is the MTL 4851 isolator powered and what is its voltage requirement?
    This isolator is loop-powered, meaning it draws power directly from the 4-20mA signal loop without requiring a separate power supply. It operates with a minimum voltage of 8.5V DC at 20mA and has a typical voltage drop of only 5.0V.
  • What applications is the MTL 4851 suitable for?
    The MTL 4851 is ideal for process control applications including temperature monitoring, pressure/level measurement, flow measurement, and analytical instruments in hazardous areas. It's particularly useful in remote locations, marine/offshore environments, and mining operations requiring intrinsic safety isolation.
  • What does the LED status indicator show on the MTL 4851?
    The bi-color LED provides visual diagnostics: solid green indicates normal operation with sufficient loop current, flashing green shows normal operation with low loop current (<3.5mA), solid red indicates a fault condition like open circuit or overload, and off means no power or loop current below 1mA.
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