Honeywell MTL4544 Repeater Power Supply

Overview

The Honeywell MTL4544 is a 2-channel smart transmitter repeater power supply. It safely interfaces 2-wire or 3-wire 4–20mA transmitters in hazardous areas with control systems in safe areas. The module delivers fully floating DC power to field transmitters while repeating analog signals to the control room. It supports HART® communication, allowing bidirectional digital data transfer over the analog signal. The MTL4544 ensures reliable operation in demanding industrial automation environments.

Technical Specifications

• Model Number: MTL4544

• Channels: 2 isolated input channels

• Input Signal: 4–20mA from 2-wire or 3-wire transmitters

• Output Signal: Repeated 4–20mA signal to safe area

• HART® Support: Yes – bidirectional digital communication

• Power Supply: 24V DC nominal

• Open-Circuit Voltage: < 28V

• Current Sink Option: Available (MTL4544S variant)

• Isolation: Fully floating inputs and outputs

• Safety Certification: SIL2 (single device), SIL3 (redundant) – IEC 61508

• Mounting: DIN rail or backplane

• Operating Temperature: –20°C to +60°C

• Dimensions: 1.58 cm x 10.98 cm x 12.36 cm

• Weight: 0.11 kg

Safe-Area Output

• Signal Range: 4–20mA

• Under/Over-Range: 0–24mA

• Load Resistance (MTL4544): 0–360Ω at 24mA, 0–450Ω at 20mA

• Load Resistance (MTL4544S): Current sink 600Ω max, max voltage source 24V DC

• Output Resistance: > 1MΩ

• Ripple: < 50µA peak-to-peak

Hazardous-Area Input

• Signal Range: 0–24mA including over-range

• Transmitter Voltage: 16.5V at 20mA

• Transfer Accuracy: Better than 15µA at 20°C

• Temperature Drift: < 0.8µA/°C

• Response Time: Settles to 10% within 50µs