MTL 2213 Isolated Intrinsic Safety Barrier
The MTL 2213 is a loop-powered, isolated intrinsic safety barrier designed for 4-20mA analog signals. It provides a critical safety interface between hazardous area instrumentation (e.g., pressure transmitters, temperature sensors) and safe area control systems (PLCs, DCS). The device limits electrical energy entering the hazardous area to prevent ignition of explosive atmospheres while maintaining high signal integrity and providing galvanic isolation to eliminate ground loops.
Technical Specifications
Product Type: Intrinsic safety barrier / 4-20mA isolator
Power Supply: Loop-powered (16.5 to 42.5 V DC from output loop)
Input Signal (Hazardous Area): 4-20 mA DC
Output Signal (Safe Area): 4-20 mA DC
Isolation Voltage: 1500 V AC (1 min) between input, output, and power
Accuracy: ±0.1% of span (typical)
Response Time: < 50 ms
Safety Certifications: ATEX Ex ia IIC, IECEx Ex ia IIC, FM/CSA Class I Div 1
Input Voltage (hazardous area): 9-32 V DC (dependent on loop resistance)
Temperature Drift: ≤ ±50 ppm/°C
Load Capacity (output): ≥ 650 Ω at 20 mA
Operating Temperature: -20°C to +60°C
Storage Temperature: -40°C to +85°C
Humidity: 5-95% RH (non-condensing)
Protection Rating: IP20 (DIN rail mount, suitable for control cabinet)
Dimensions (W × H × D): 22.5 mm × 100 mm × 115 mm
Weight: Approx. 150 g
Mounting: DIN rail (TS35/7.5 or TS35/15)
HART Compatibility: Yes (transparent, no signal attenuation)
Intrinsic Safety and Signal Integrity
The MTL 2213 uses precision limiting networks to ensure that voltage, current, and power levels remain below the ignition thresholds of explosive atmospheres (Ex ia IIC). Unlike traditional Zener barriers that require a high-integrity grounding system, the MTL 2213 employs an isolated architecture that eliminates the need for safety grounding, simplifying installation and reducing fault points. The built-in DC/DC converter provides a stable 18V loop power for field transmitters, ensuring reliable operation even over long cable runs with significant voltage drop.
HART Compatibility and Transparent Communication
The MTL 2213 is fully transparent to HART communication, allowing digital signals from smart transmitters to pass through without attenuation or filtering. This enables engineers to perform device configuration, diagnostics, and calibration from the safe area using a HART communicator or asset management software. The device is compatible with major process automation systems (Emerson, Yokogawa, Siemens) and supports both HART 5, 6, and 7 standards.
Application Domains
The MTL 2213 is used in hazardous area process control for isolating 4-20mA signals from pressure, temperature, level, and flow transmitters. It is essential in oil and gas (wellhead monitoring, pipeline pressure), chemical and pharmaceutical (reactor temperature, tank level), power generation (gas turbine monitoring), and water/wastewater treatment (gas detection in enclosed areas). The device meets the requirements of SIL 2 safety instrumented systems (SIS) when used with certified transmitters.
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