Description

Parameters of MTL4850

The MTL4850 is a safety barrier (intrinsically safe device) from MTL Instruments, designed for hazardous areas (e.g., oil & gas, chemical plants) to protect field instruments (sensors, transmitters) by limiting electrical energy (voltage/current) and preventing ignition of flammable atmospheres. Below are its core technical parameters, aligned with MTL’s official safety barrier specifications and IEC/ATEX intrinsic safety standards:

Parameter Category	Specification
Basic Model Info	– Brand: MTL Instruments (a Siemens business, specializing in hazardous-area electronics) – Product Type: Isolated Intrinsically Safe (IS) Safety Barrier – Application: Protects 4–20 mA analog input devices (e.g., pressure/temperature transmitters) in Zone 0/1/2 hazardous areas (gas/dust atmospheres)
Intrinsic Safety Ratings	– Certification: ATEX (II 1G Ex ia IIC T6 Ga), IECEx (Ex ia IIC T6 Ga), cCSAus (Class I, Div 1, Groups A–D) – Hazardous Area Zone: Suitable for Zone 0 (gas) / Zone 20 (dust) (highest safety level for continuous explosive risk) – Temperature Class: T6 (max surface temp ≤ 85°C, compatible with most flammable gases)
Electrical Parameters	– Input Side (Safe Area): – Power Supply: 24 V DC (typical industrial voltage) – Input Current: Max 30 mA – Input Voltage: 20–30 V DC – Output Side (Hazardous Area): – Max Open-Circuit Voltage (Uo): 28 V DC – Max Short-Circuit Current (Io): 30 mA – Max Power (Po): 0.5 W (energy-limited to prevent ignition) – Signal Type: 4–20 mA analog signal (bi-directional, for sensor data transmission)
Isolation & Protection	– Isolation Voltage: 2.5 kV AC (between input, output, and ground; prevents ground loops and interference) – Protection Features: Over-current protection, over-voltage clamping, reverse polarity protection (prevents damage from incorrect wiring) – Signal Accuracy: ≤0.1% full-scale (ensures precise transmission of 4–20 mA sensor data)
Mechanical & Installation	– Housing: DIN rail-mounted plastic enclosure (compatible with standard 35 mm DIN rails) – Dimensions: Approx. 12.5 mm (W) × 110 mm (H) × 115 mm (D) (compact design for dense cabinet mounting) – Wiring: Screw terminals (2.5 mm² max wire size; for secure industrial connections)
Environmental Ratings	– Operating Temperature: -20°C to +60°C (suitable for indoor/outdoor control cabinets) – Storage Temperature: -40°C to +85°C – Humidity: 5%–95% RH (non-condensing) – Protection Class: IP20 (dust-protected, intended for cabinet mounting)
Performance & Compliance	– EMC Compliance: EN 61326-1 (industrial immunity/emission standards; resistant to electromagnetic interference) – MTBF (Mean Time Between Failures): ≥1,000,000 hours (high reliability for critical hazardous-area operations) – Indication: LED indicators (power on, signal active, fault status; for quick troubleshooting)

MTL4850 PDF

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