MTL​ (Measurement Technology Ltd) is a global leader in industrial instrumentation and hazardous area protection solutions. Specializing in intrinsic safety barriers, signal conditioners, and surge protection devices, MTL serves oil & gas, chemical, and process industries worldwide. With over 50 years of expertise, the brand delivers reliable, certified products for critical safety applications, ensuring operational excellence in explosive environments.

Product Overview

The ​MTL 4544​ is a high-performance repeater power supply designed for reliable signal conditioning in hazardous industrial environments. This two-channel interface device provides safe and accurate signal transmission between field-mounted transmitters in explosive atmospheres and control systems in safe areas. Featuring galvanic isolation and HART communication support, it ensures precise 4-20mA signal repetition while maintaining intrinsic safety standards for critical process control applications.

Key Features

• ​Dual-Channel Design​ - Two independent channels for efficient system integration

• ​HART Communication Support​ - Bidirectional digital signal transmission capability

• ​Galvanic Isolation​ - 250V AC isolation between hazardous and safe areas

• ​Intrinsic Safety Certification​ - Approved for Zone 0/Division 1 hazardous locations

• ​Wide Operating Range​ - Flexible 20-35V DC power supply input

• ​High Accuracy​ - Precision signal repetition with minimal error

• ​Compact Design​ - Space-efficient module for high-density installations

• ​LED Status Indicators​ - Visual power and operational status monitoring

Technical Specifications

Electrical Characteristics

Power Specifications

• ​Supply Voltage Range​ | 20-35V DC operating voltage

• ​Current Consumption​ | Maximum 96mA at 24V DC

• ​Power Dissipation​ | 1.4W standard version, 1.9W S-version

• ​Isolation​ | 250V AC galvanic isolation between all circuits

Signal Performance

• ​Signal Range​ | 4-20mA standard, 0-24mA over-range capability

• ​Transfer Accuracy​ | Better than 15μA at reference temperature

• ​Temperature Stability​ | <0.8μA/°C drift across operating range

• ​Output Ripple​ | <50μA peak-to-peak maximum

• ​Response Time​ | Fast 50μs settling time to within 10% of final value

Load Capabilities

• ​Safe-Area Load​ | Up to 360Ω at 24mA, 450Ω at 20mA

• ​Current Sink Capability​ | MTLx544S version supports 600Ω maximum

• ​Output Resistance​ | >1MΩ circuit output resistance

Safety Certifications

Hazardous Area Approvals

• ​ATEX Certification​ | II 1G Ex ia IIC T4 Ga

• ​IECEx Certification​ | Ex ia IIC T4 Ga

• ​FM Approval​ | Class I, Division 1 Groups A, B, C, D

• ​Zone Classification​ | Suitable for Zone 0, IIC, T4-T6 hazardous areas

• ​Division Rating​ | Division 1, Group A hazardous locations

Safety Parameters

• ​Maximum Voltage (Uo)​​ | 28V

• ​Maximum Current (Io)​​ | 93mA

• ​Maximum Power (Po)​​ | 651mW

• ​Maximum Input Voltage (Um)​​ | 253V RMS or DC

Mechanical Specifications

Physical Construction

• ​Housing Material​ | Industrial-grade materials

• ​Enclosure Design​ | Compact form factor for high-density installation

• ​Mounting System​ | DIN rail compatible (35mm standard)

• ​Connection Method​ | Screw terminal blocks

• ​Weight​ | Approximately 110g (0.11kg)

Environmental Specifications

• ​Operating Temperature​ | -20°C to +60°C

• ​Storage Temperature​ | -40°C to +80°C

• ​Protection Rating​ | IP20 equivalent for front protection

• ​Vibration Resistance​ | Suitable for industrial environments

Applications

The MTL 4544 is ideal for:

• ​Oil and Gas Facilities​ - Process measurement in explosive atmospheres

• ​Chemical Plants​ - Hazardous area signal conditioning and isolation

• ​Pharmaceutical Manufacturing​ - Critical process control applications

• ​Water Treatment Plants​ - Signal isolation and repetition

• ​Power Generation​ - Safety-critical measurement systems

• ​Marine Applications​ - Offshore and shipboard systems

• ​Industrial Automation​ - General process control applications

Installation & Operation

Mounting Configuration

• ​DIN Rail Mounting​ | Standard 35mm DIN rail installation

• ​Orientation​ | Any mounting position supported

• ​Clearance Requirements​ | Standard industrial spacing

• ​Group Installation​ | Can be mounted with other MTL series devices

Electrical Connections

• ​Terminal Connections​ | Screw terminal blocks for secure wiring

• ​Wiring Specifications​ | Follow manufacturer's torque specifications

• ​Grounding​ | Proper grounding for safety and performance

• ​HART Communication​ | Terminals 1&2 and 4&5 for HART signals

Configuration

• ​No Configuration Required​ | Plug-and-play operation

• ​Status Monitoring​ | LED indicators for power and operation status

• ​Function Verification​ | Simple operational verification procedure

Why Choose MTL 4544?

• ​Proven Safety​ | Certified for most demanding hazardous areas

• ​Dual-Channel Efficiency​ | Two independent channels in compact design

• ​HART Communication​ | Support for digital signal transmission

• ​High Accuracy​ | Precision signal repetition for critical applications

• ​Easy Integration​ | Simple installation and operation

• ​Global Compliance​ | International safety certifications

• ​Reliable Performance​ | MTL's reputation for industrial reliability

Maintenance & Service

• ​Visual Inspection​ | Regular check of physical condition and LED status

• ​Performance Verification​ | Periodic signal accuracy testing

• ​Terminal Check​ | Verify terminal tightness during maintenance

• ​Environmental Protection​ | Ensure operating within specifications