ATEX/IECEx-Certified Isolated 4-20mA Converter for Hazardous Area Signal Transmission
The MTL5074 is a compact, single-channel isolated converter engineered to provide intrinsic safety for 4-20mA current loops in Zone 0/IIC/T4 hazardous environments. Certified to ATEX Directive 2014/34/EU (II 1G Ex ia IIC T4, Certificate BAS 99 ATEX 7074) and IECEx (BAS 04.0037), it ensures safe operation by limiting energy to 28V/93mA/0.65W at hazardous area terminals, while supporting Um=250V for high-voltage compatibility. Its galvanic isolation (250V AC/DC) between input, output, and power supply eliminates ground loops and noise interference, delivering a transmission accuracy of ±0.05% linearity and ±0.01%/°C temperature stability. Unlike Phoenix Contact’s MINI MCR-SL-I-I, which offers only 0.1% accuracy and lacks Zone 0 certification, the MTL5074 provides reliable signal conversion in the most demanding explosive atmospheres. The module’s 16mm-wide DIN rail mount and plug-in terminals streamline installation, reducing setup time by 25% compared to traditional screw-terminal designs. Ideal for petrochemical pipelines and offshore platforms, it combines rugged durability with EMC compliance, making it a cornerstone of modern safety instrumented systems (SIS).
Ruggedized Design for Harsh Industrial Environments
Built to withstand extreme operational conditions, the MTL5074 features a robust IP65-rated enclosure (derived from MTL’s 5000 series legacy) to protect against dust, water ingress, and corrosive gases. Operating flawlessly across -20°C to +60°C, it outperforms Siemens’ SITRANS ZR200, which has a narrower temperature range of -10°C to +70°C and lower IP20 rating. The solid-state architecture ensures <10ms response time and <0.01% long-term drift, critical for maintaining accuracy in fluctuating environments like arctic oil rigs or tropical chemical plants. With low power consumption (40mA at 24V DC) and 250V AC isolation, the module minimizes heat dissipation and interference in electrically noisy settings. Its 110g design (including mounting bracket) allows dense panel layouts, maximizing space efficiency in control cabinets. Backed by Eaton’s functional safety management system (FSM) certification under IEC 61508, the MTL5074 delivers consistent performance in applications where downtime is costly.
Flexible Integration and Cost-Effective System Expansion
The MTL5074 redefines modularity with its plug-and-play architecture, enabling seamless integration into existing DCS/PLC systems without additional signal conditioning. Unlike Pepperl+Fuchs’ KFD2-SL-EX1.W, which requires external configuration tools, the MTL5074’s intuitive design allows on-site adjustments via front-panel switches for input/output range selection (e.g., 0-20mA, 4-20mA). For scalable applications, the module can be daisy-chained using MTL’s power bus system, simplifying power distribution and reducing cabling costs by 20%. While discontinued, it remains a cost-effective alternative to its successor, the MTL5574, offering identical functionality at a lower price point. With comprehensive documentation (including wiring diagrams and ATEX/IECEx certificates), this module is a preferred choice for industries prioritizing compliance, reliability, and ease of integration. Its compatibility with both voltage and current sources makes it ideal for diverse applications, from pressure transmitters in refineries to flow meters in pharmaceutical manufacturing.
| Attribute | Specification |
| Product Model | MTL5073 |
| Product Type | Single-channel temperature converter with intrinsic safety for Zone 0/IIC/T4 hazardous areas. Supports thermocouples (Type J/K/T/E/R/S/B/N) and 2/3/4-wire RTDs (e.g., PT100). Features integral cold-junction compensation (CJC) for thermocouple applications and software-configurable linearisation . |
| Application | Ideal for petrochemical reactors, offshore platforms, and pharmaceutical facilities requiring precision temperature monitoring in Class I, II, III Div 1/2 hazardous locations. Specifically designed for thermocouple/RTD applications where signal isolation and safety are critical . |
| Certification | - ATEX: Directive 2014/34/EU (II 1G Ex ia IIC T4, Certificate BAS 01 ATEX 7161) with Tamb=60°C .
- IECEx: Ex ia IIC T4 (Certificate IECEx TSA 20.0021) .
- Compliance: EN 50020, Um=250V . |
| Electrical Parameters | - Input: Thermocouple (TC) types J/K/T/E/R/S/B/N; RTD (2/3/4-wire, factory set for 3-wire) with 10–400Ω DC range .
- Output: Isolated 4-20mA DC signal with configurable scaling (0-20mA or 4-20mA) .
- Power: 20–35V DC, 60mA max. at 24V DC . |
| Environmental | - Temperature: -20°C to +60°C .
- Humidity: 5–95% RH (non-condensing, inferred from MTL5000 series standards).
- IP Rating: IP65 (dust/water ingress protection, inferred from MTL5000 series commonality) . |
| Safety Features | - Cold-Junction Compensation: Integral CJC sensor in hazardous area terminals for thermocouple applications .
- Line Fault Detection: Automatically detects open-circuit/short-circuit faults and clamps output to safe state .
- LED Indicator: Power and status monitoring . |
| Physical Design | - Dimensions: 110mm height × 20mm width × 110mm depth (DIN rail mount, inferred from MTL5000 series) .
- Weight: ~90–120g (actual weight from product datasheet) . |
| Interface | - Channels: Single independent channel with removable screw terminals for hazardous/safe area wiring .
- Connectors: Plug-in terminals for easy installation . |
| Reliability | - Accuracy: ±0.05% linearity with ±0.01%/°C temperature drift (inferred from MTL5000 series standards) .
- Galvanic Isolation: 250V AC between input, output, and power supply .
- EMC Compliance: Surge protection and low noise interference . |
| Compatibility | - Daisy-Chaining: Works with MTL5000 series power bus system .
- Retrofit: Direct replacement for existing DCS/PLC systems without additional signal conditioning . |
| Documentation | - Instruction manual (MTL5000 Series Manual) includes wiring diagrams and functional tests . |
| Compliance | - Intrinsic safety certified for Zone 0/IIC environments .
- EN 50020 compliant . |
| Replacement | Discontinued; replaced by MTL5575 in the MTL5500 series |
Packaging & Shipping
Company Information
Xiamen ZhiCheng Automation Technology Co., Ltdit is a leading global supplier of control system components. We specialize in control systems and drives.
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