MTL4576-THC Eaton MTL 4500 Series | Dual-Channel Temperature Signal Converter

Manufacturer: MTL
Product No.: MTL4576-THC
Condition： In stock
Product Type: Thermocouple Isolator Module
Product Origin: EN
Payment: T/T, Western Union
Weight: 500g
Shipping port: Xiamen
Warranty: 12 months

Quantity

Selected quantity: 1

Estimate delivery times: 12-26 days (International), 3-6 days (United States).

Return within 30 days of purchase. Duties & taxes are non-refundable.

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MTL4576-THC | Thermocouple Signal Conversion and Isolation

The MTL4576-THC belongs to the MTL 4500 Intrinsically Safe Isolators family. It converts low-level thermocouple and millivolt signals into standard 4-20mA outputs.

Its two-channel architecture supports temperature measurement from hazardous-area installations. Each channel provides configurable thermocouple linearisation, temperature ranging, monitoring, and testing functions.

The module integrates cold-junction compensation into its hazardous-area connection arrangement. Users do not need to order a separate cold-junction compensation component. Configuration uses a PC running MTL PCS45 software and a PCL45USB interface.

01 | Signal Conversion Architecture

The MTL4576-THC handles the complete temperature signal conversion process between field sensors and safe-area equipment.

Field Input: Accepts low-level thermocouple signals and millivolt inputs.
Thermocouple Processing: Supports eight standard thermocouple types plus XK.
Cold-Junction Compensation: Provides automatic or selectable compensation.
Signal Linearisation: Applies software-selected linearisation for supported thermocouple types.
Analog Conversion: Converts processed measurements into 4-20mA currents.
Safe-Area Interface: Drives compatible control-system input circuits.

This architecture helps connect hazardous-area temperature sensors to PLC, DCS, and other compatible analog input systems.

02 | Engineering Specification

Manufacturer / Brand	Eaton MTL
Model	MTL4576-THC
Product Series	MTL 4500
Product Category	Intrinsically Safe Thermocouple Isolator
Channel Configuration	Two independent channels
Input Signal Types	J, K, T, E, R, S, B, N and XK; mV input
Thermocouple Standard	BS 60584
Input Signal Range	-75 to +75mV
Input Signal Span	3 to 150mV
Cold-Junction Compensation	Automatic or selectable
Cold-Junction Error	≤ 1.0°C
Output Signal	4-20mA nominal
Maximum Output Load	300Ω
Common-Mode Rejection	120dB at 240V, 50Hz or 60Hz
Series-Mode Rejection	40dB at 50Hz or 60Hz
Input Calibration Accuracy	±15µV or ±0.05% of input value, whichever is greater
Output Calibration Accuracy	±16µA
Input Temperature Drift	±0.003% of input value/°C, typical
Output Temperature Drift	±0.6µA/°C, typical
Sensor Burnout Response	Upscale, downscale, or off
Maximum Lead Resistance	300Ω with sensor-failure safety drive enabled; greater than 10kΩ with safety drive disabled
Response Time	Configurable; 500ms default
Power Supply	60mA at 24V with 20mA signal
Power Dissipation	1.4W at 24V with 20mA signal
Isolation	Functional channel-to-channel isolation and isolation between safe and hazardous-area circuits
LED Indicators	Green power/status, yellow channel status, red alarm
Hazardous-Area Application	Zone 0, IIC, T4–T6; Division 1, Group A
Maximum External Voltage	Um = 253V rms or DC
Configuration Software	MTL PCS45
Configuration Interface	PCL45USB serial interface

03 | Measurement Integrity and Interference Rejection

Low-level thermocouple signals require careful interference control. The MTL4576-THC provides defined rejection and calibration characteristics for industrial measurement applications.

Interference Rejection

120dB Common-Mode Rejection: Reduces common-mode interference at 240V and 50/60Hz.
40dB Series-Mode Rejection: Suppresses specified series-mode interference at 50/60Hz.
Channel Isolation: Provides functional isolation between channels and circuit areas.

Calibration Performance

Input accuracy: ±15µV or ±0.05% of input value, whichever is greater.
Output accuracy: ±16µA.
Cold-junction compensation error: Maximum 1.0°C.
Input drift: Typically ±0.003% of input value per °C.
Output drift: Typically ±0.6µA per °C.

These specifications help engineers evaluate signal integrity and measurement uncertainty. Actual loop performance also depends on sensor accuracy, wiring, installation conditions, and calibration.

04 | Cold-Junction Compensation and Sensor Configuration

Thermocouples generate millivolt signals based on temperature differences. Accurate conversion therefore requires appropriate cold-junction compensation.

The MTL4576-THC integrates this function into its hazardous-area connection arrangement. Engineers can select automatic or configurable compensation modes.

Supported thermocouple types include:

Thermocouple Type	Engineering Application
J	General industrial temperature measurement
K	Wide-range industrial temperature monitoring
T	Low-temperature measurement applications
E	Temperature measurement requiring high thermoelectric output
R / S	High-temperature process measurement
B	High-temperature furnace applications
N	Industrial high-temperature measurement
XK	Supported special thermocouple input configuration

Verify the thermocouple type and applicable sensor calibration standard before configuring each channel.

05 | Configuration and Commissioning Workflow

Configuration requires a personal computer with the appropriate MTL software and interface hardware.

Prepare the Hardware: Obtain a PC, MTL PCS45 software, and PCL45USB interface.
Verify Input Types: Identify the connected thermocouple or millivolt source.
Select Linearisation: Configure the correct thermocouple characteristic.
Set Measurement Range: Define the required input span and output scaling.
Configure Compensation: Select the appropriate cold-junction compensation mode.
Set Burnout Behaviour: Choose upscale, downscale, or off response.
Configure Response Time: Retain the 500ms default or select a suitable alternative.
Verify Output: Test the 4-20mA signal against the receiving analog input.
Record Configuration: Document channel settings and commissioning results.

Engineering Note: The specification identifies 500ms as the default response time. Accuracy at 100ms or 200ms requires confirmation from Eaton's MTL product documentation.

06 | LED Diagnostics and Field Troubleshooting

The three LED indications help technicians identify operating conditions during commissioning and maintenance.

Green LED	Power and general status indication
Yellow LED	Channel status indication
Red LED	Alarm indication

Practical Diagnostic Recommendations

Unexpected Output: Check the selected input type and configured measurement span.
Temperature Offset: Verify cold-junction compensation settings and terminal connections.
Unstable Readings: Inspect thermocouple polarity, cable routing, and grounding arrangements.
Incorrect Burnout Response: Review the programmed sensor-failure direction.
Output Saturation: Check input range configuration and the connected loop load.
Communication Problems: Inspect the PC interface and configuration software connection.

07 | System Integration and Application Compatibility

The MTL4576-THC converts hazardous-area temperature measurements into a standard current signal. Its output supports integration with compatible safe-area instrumentation.

PLC Systems: Connect the 4-20mA output to compatible analog input modules.
DCS Platforms: Transfer temperature measurements into process control channels.
SCADA Systems: Provide measurement signals through compatible control-system interfaces.
Industrial Instrumentation: Support temperature monitoring and process indication.
Hazardous-Area Sensors: Accept supported thermocouple signals from specified hazardous locations.

Check loop load, input impedance, wiring resistance, and safety parameters before system integration. The maximum nominal output load is 300Ω.

08 | Intrinsic Safety and Installation Considerations

The module is specified for hazardous-area signal sources in the following applications:

Gas Group: IIC.
Equipment Protection: T4–T6 temperature classes, subject to certification details.
IEC Zone: Zone 0 application.
North American Classification: Division 1, Group A application.
Maximum External Voltage: Um = 253V rms or DC.

Always consult the applicable certificate for intrinsic safety parameters. Verify the complete loop design, entity parameters, grounding, and installation requirements before energising the system.

12-Month Comprehensive Warranty

Every part supplied by Global PLC Spare Hub is covered by a 12-month warranty from the date of invoice.

Coverage: Functional defects and hardware failures under normal operating conditions.
Commitment: We provide immediate repair, replacement, or a full refund for any verified defective components to minimize your operational downtime.

Returns & Exchange Policy

We offer a 30-day return policy to ensure you receive the exact part your system requires.

Eligibility: Returns are accepted for uninstalled items in their original, factory-sealed packaging.
RMA Process: Please contact our support team to obtain a Return Merchandise Authorization (RMA) number before shipping.
Fast Processing: Refunds or exchanges are processed within 3–5 business days after the returned item passes our technical inspection.

Need Technical Assistance?Not sure if this part is compatible with your system? [Consult our Engineers] before purchasing to ensure 100% compatibility.