Honeywell MTL4575 Temperature Converter

Overview

The Honeywell MTL4575 is a temperature converter designed for hazardous areas. It converts thermocouple (THC) or RTD signals into standard 4–20mA current loops. The device enables safe, accurate data transmission to control systems in safe areas. It features configurable alarms, integral cold junction compensation, and DIN rail mounting.

Technical Specifications

• Model: MTL4575

• Number of Channels: One

• Input Types: Thermocouple (J, K, T, E, R, S, B, N) or RTD (Pt100, Pt500, Pt1000, Cu50, Cu53, Ni100/500/1000)

• RTD Wiring: 2-, 3-, or 4-wire

• Input Signal Range: –75 to +75 mV, or 0–400Ω (0–1000Ω for Pt & Ni sensors)

• Input Signal Span: 3–150 mV, or 10–400Ω (10–1000Ω for Pt & Ni sensors)

• RTD Excitation Current: 200 µA nominal

• Output Signal: 4–20 mA into 600Ω max

• Alarm Output: Relay, 250 mA at 35V max, software configurable

• Cold Junction Compensation: Integral, automatic or selectable

• Cold Junction Error: ±1.0°C

• Common Mode Rejection: 120 dB for 240V at 50/60 Hz

• Series Mode Rejection: 40 dB for 50/60 Hz

• Calibration Accuracy: THC/mV ±15 µV or ±0.05% of input; RTD ±80 mΩ; output ±11 µA

• Temperature Drift: THC/mV ±0.003%/°C; RTD ±7 mΩ/°C; output ±0.6 µA/°C

• Safety Drive on Sensor Failure: Upscale, downscale, or off

• Early Burnout Detection: Optional for thermocouples

• Maximum Lead Resistance (THC): 600Ω

• Response Time: Configurable, 500 ms default

• LED Indicators: Green for power/status, yellow for alarm

• Power Consumption: 50 mA at 24V with 20mA output

• Power Dissipation: 1.2 W at 24V

• Operating Voltage: Um = 253V RMS or DC

• Mounting: DIN rail

• Configuration: PC with MTL PCS45 software and PCL45USB interface

• Weight: 0.24 lbs