MTL4644D MTL Instruments Single Channel 4-20mA HART Repeater Power Supply

Product Overview

• The MTL4644D is a single-channel repeater power supply for 2/3-wire transmitters.
• It features a dual-output design, allowing one input to drive two isolated loads.
• This MTL4644D unit supports bi-directional HART communication for smart sensors.
• Provides high-speed 50µs response times for critical process control.
• The MTL4644D is engineered for high-accuracy 4-20mA signal replication.

Technical Specifications

• Brand: MTL Instruments / Eaton
• Model: MTL4644D
• Input Type: 0 to 24mA (supports 2-wire and 3-wire devices)
• Output Type: Dual 4 to 20mA isolated outputs
• Transmitter Voltage: 16.5V @ 20mA
• Accuracy: Better than 15µA at 20°C
• Response Time: 50µs (Settles to within 10% of final value)
• HART Support: Bi-directional on Input and Output Channel 1
• Load Resistance: Up to 450Ω per output at 20mA
• Power Consumption: 96mA @ 24V DC
• Indicator: Green LED for Power status

Global PLC Spare HUB’s Insight

• The MTL4644D is the ideal "signal splitter" for high-reliability industrial loops.
• Our review highlights the ultra-low 0.8µA/°C temperature drift, ensuring stability in outdoor cabinets.
• The module eliminates the need for external power supplies for 3-wire sensors.
• Fast 50µs processing makes it a top-tier choice for high-speed safety instrumented systems.

Application Scenarios & Equipment Compatibility

• Process Automation: Linking field transmitters to both a PLC and a local chart recorder.
• HART Networking: Transparent digital communication for remote device configuration.
• Safety Systems: High-speed signal isolation for surge-sensitive control loops.
• Ground Loop Elimination: Providing a fully-floating supply to isolate noisy field grounds.

Diagnostic & Safety Capabilities

• Visual Diagnostics: Front-panel Green LED for instant power verification.
• Signal Integrity: Output resistance >1MΩ prevents downstream load interference.
• Isolation Barrier: Protects control system I/O cards from field-side electrical transients.
• Smart Device Access: Enables full HART pass-through for maintenance and calibration.

Shipping and Purchase Terms

• Logistics Network: Global expedited shipping via FedEx, UPS, and DHL.
• Handling Time: Orders for the MTL4644D ship within 24-48 hours.
• Warranty Protection: Backed by a full 12-month quality warranty.
• Package List: One (1) MTL4644D isolator module.

Frequently Asked Questions (FAQ)

• Can I use only one output of the MTL4644D if needed? Yes, if only one output is required, the other can be left open without affecting the performance of the active channel.
• How do I wire a 3-wire transmitter to the MTL4644D? The module provides a terminal specifically for the third wire (common), ensuring the transmitter receives the full 16.5V supply.
• Does the MTL4644D require external calibration? No, the module is factory-calibrated for high precision (better than 15µA accuracy) and is designed for maintenance-free operation.
• What happens if the input signal exceeds 20mA? The MTL4644D accurately repeats signals up to 24mA, covering standard over-range diagnostic levels.
• Selection Guide: Why use the 4644D instead of the 4541? Choose the MTL4644D specifically when you need to split one signal into two independent outputs or when ultra-fast 50µs response is required.

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