Product Overview for the MTL4041A Isolator

The MTL4041A is a single-channel isolator for separately powered 4/20mA transmitters. Firstly, it enables bi-directional transmission of digital communication signals. As a result, you can interrogate a smart transmitter from an operator station. In addition, a hand-held communicator (HHC) also works perfectly with this unit. Specifically, the MTL4041A places the transmitter in Zone 0, IIC, T4–6 areas. Moreover, it suits Div.1, Group A hazardous locations. Consequently, the MTL4041A simplifies loop power for both conventional and smart devices.

Technical Specifications of the MTL4041A

Input and Signal Characteristics

• Number of Channels: One channel per unit.

• Input Signal Range: Supports 4 to 20mA standard loop current.

• Over/Under-range: Covers from 1.0mA to 21.5mA.

• Input Impedance (HART®): Provides >230Ω at terminals 5 and 6.

• Maximum Input Volt Drop: Less than 6.2V at terminals 5 and 6.

• Transmitter Load: Equivalent to a 310Ω load at 20mA.

Output and Accuracy Features

• Safe-area Load Resistance: Ranges from 0 to 600Ω for conventional transmitters.

• Smart Transmitter Load: Needs 250Ω ±10% for proper HART communication.

• Output Resistance: Exceeds >1MΩ for signal integrity.

• Transfer Accuracy at 20°C: Achieves better than 20µA.

• Temperature Drift: Maintains less than 1µA/°C drift.

• Response Time: Settles within 200µA of the final value after 20ms.

Communication and Power Details

• Digital Bandwidth: Supports 50Hz to 8kHz for HART signals.

• Safe-area Circuit Ripple: Shows <50µA peak-to-peak up to 80kHz.

• LED Indicator: A green LED shows power status.

• Power Requirement at 20mA: Consumes 70mA at 24V. Consumes 85mA at 20V. Consumes 50mA at 35V.

• Power Dissipation: Dissipates 1.6W at 24V. Dissipates 1.7W at 35V.

Isolation and Safety Parameters

• Isolation Voltage: Provides 250V AC isolation between safe and hazardous areas.

• Safety Description: Terminals 3-4 and 5-6 show 8.6V (diode).

• Simple Apparatus Parameters: Features U ≤ 1.5V, I ≤ 0.1A, P ≤ 25mW.

• Connection Rules: Connects to an IS loop with open circuit voltage not above 28V.

Installation Guide for the MTL4041A

Follow these steps for a reliable installation of the MTL4041A. Firstly, clip the unit onto a standard DIN rail in a safe area. For hazardous area wiring, connect the transmitter to terminals 5 (+ve) and 6 (-ve). In addition, connect a hand-held communicator to terminals 3/4 or 7/8. For the safe area, connect the control system input to terminals 9 (+ve) and 11 (-ve). Then, apply 24V DC power to terminal 14 (+ve) and terminal 13 (-ve). Finally, ensure proper grounding for maximum noise immunity.

Packaging List for the MTL4041A

• MTL4041A isolator module (1 unit)

• Product quick start guide (1 copy)

• Terminal number label sticker (1 sheet)

Frequently Asked Questions (FAQs) About the MTL4041A

Q1: Can I use the MTL4041A with a standard 4/20mA transmitter?

Yes, the MTL4041A works with both conventional and smart transmitters. However, you must set the safe-area load resistance between 0 to 600Ω for conventional types.

Q2: Does this unit support two-way HART communication?

Yes, it provides bi-directional transmission of digital signals. Therefore, you can interrogate the transmitter from a DCS or a hand-held communicator.

Q3: What is the maximum input voltage drop for the loop?

The MTL4041A has a maximum input volt drop of less than 6.2V. As a result, this ensures enough voltage for the connected transmitter.

Q4: Where can I place the transmitter with this isolator?

You can place a suitably certified transmitter in Zone 0, IIC, T4-6 areas. In addition, it also works in Div.1, Group A hazardous locations.

Q5: Why is my green LED not turning on?

Check the power supply voltage at terminals 13 and 14. Specifically, the unit needs 20-35V DC to operate correctly.