Eaton MTL5532 Pulse Isolator MTL

MTL5532 Pulse Isolator for Hazardous Area Signals

Product Introduction

The MTL5532 pulse isolator transfers frequency signals from Zone 0 hazardous locations to safe-area control systems. It accepts inputs from sensors, flow meters, or vibration monitors. This device then delivers either a 4-20mA analogue signal or a digital pulse output. Fully floating channel design ensures excellent noise rejection. In addition, the MTL5532 provides galvanic isolation of 250V rms. Engineers use this model widely in safety loops and SIL-rated applications.

Technical Specifications

Input Characteristics

The MTL5532 reads input signals with high sensitivity. Output turns OFF when input current falls below 1.2mA (or resistance exceeds 10kΩ). Output turns ON when input rises above 2.1mA (or resistance drops below 2kΩ). Input impedance sits at greater than 10kΩ, which minimizes loading on field sensors.

Output Modes

This isolator offers two output options. First, the analogue output provides a 4-20mA signal. Second, the pulse output delivers digital pulses. Switching frequency reaches 0-10 kHz for analogue output mode. In pulse output mode, frequency goes up to 0-50 kHz. The output signal range spans 0-22mA including under/over range conditions.

Current and Load Details

Normal operating current is 24mA. Load resistance ranges from 0 to 450Ω at 20mA. For voltage output applications, minimum load resistance exceeds 1MΩ. Therefore, the MTL5532 works with most PLC and DCS input cards directly.

Transfer Accuracy and Drift

Transfer accuracy stays better than 20µA. Temperature drift measures below 1.0µA/°C, ensuring stable readings across varying ambient conditions. Ripple is kept under 50µA peak-to-peak. Hysteresis sits at 0.2mA when using a 650Ω load. Response time reaches 60ms, which is adequate for most process control loops.

Isolation and Safety Features

Galvanic isolation stands at 250V rms between safe-area circuits and the power supply. This device carries IECEx/ATEX approval for Zone 0 hazardous locations. EMC compliance follows EN61326. The MTL5532 is suitable for use in safety instrumented systems up to SIL2 and SIL3 when properly integrated.

Configuration Method

You need a personal computer to configure the MTL5532. Use the MTL PCS45 software together with a PCL45USB serial interface. This setup allows you to select output mode, adjust filtering, and set frequency ranges. Meanwhile, no configuration is required for basic 4-20mA operation. The default settings work for most standard pulse inputs.

Mechanical and Environmental Parameters

Mount the MTL5532 on a standard 35mm DIN rail (T-section). Dimensions are 109.8 mm deep, 118.8 mm high, and 15.8 mm wide. Weight is only 150g. Operating temperature ranges from -20°C to 60°C. Storage allows -40°C to 80°C. Humidity tolerance spans 5% to 95% relative humidity, non-condensing.

Power Supply and Dissipation

Power supply requirement is 20-35 Vdc. Maximum power dissipation reaches 1.75W at 35V. At 24V, maximum dissipation drops to 1.35W. This low power consumption makes the MTL5532 suitable for crowded cabinets with limited cooling.

LED Indication

Three LEDs provide clear status information:

• Green LED – Power is present

• Yellow LED – Output status or pulse activity

• Red LED – Line fault detection (LFD) indicates a field wiring issue

These indicators help maintenance staff diagnose problems quickly without additional tools.

Installation Guide

Follow these steps to install the MTL5532 correctly:

1. Mount the DIN rail – Use a 35mm T-section rail with proper grounding.

2. Attach the unit – Hook the top onto the rail, then press the bottom until it clicks.

3. Connect power – Wire 20-35 Vdc to the power terminals. Observe correct polarity.

4. Wire the input – Connect the pulse or vibration sensor to the input terminals.

5. Wire the output – Connect the 4-20mA or pulse output to your control system.

6. Apply power – Check that the green LED lights up.

7. Configure if needed – Use MTL PCS45 software for non-default settings.

For hazardous area use, always follow local wiring codes and the device’s IECEx/ATEX certificate conditions.

Packaging List

• MTL5532 pulse isolator unit – 1 piece

• Terminal crimp ferrules – 6 pieces

• Product label with model and certifications – pre-installed

• Quick start reference card – 1 sheet

Note: No certificates or warranty documents are included.

Shipping Methods

We ship worldwide using FedEx, UPS, or DHL. Tracking numbers are provided within 24 hours after dispatch.

Frequently Asked Questions (FAQ)

1. Can the MTL5532 accept a dry contact switch input?
Yes, it works with dry contacts. The switch must have an off resistance above 10kΩ and an on resistance below 2kΩ. Most mechanical relays and micro switches meet this requirement.

2. What is the red LED telling me?
The red LED indicates a line fault. This means the field wiring has a break or short circuit. Check your input sensor and cabling immediately.

3. Do I need a computer to use this isolator?
No, not for basic 4-20mA output. The MTL5532 works out of the box with default settings. You only need the PCS45 software for pulse output mode or custom frequency scaling.

4. How fast can the pulse output run?
In pulse output mode, the MTL5532 handles frequencies up to 50 kHz. This supports most flow meters, encoders, and high-speed counters.