MTL4787+ Transmitter Solenoid Protection | MTL Brand

MTL4787+ Dual-Channel Intrinsic Safety Barrier

The MTL4787+ delivers advanced protection for control devices in hazardous environments. This innovative barrier features two completely isolated channels in a space-saving design. It provides intrinsic safety for various field devices including transmitters and solenoids. The unit serves as a direct replacement for older MTL787S barrier models with enhanced performance.

Key Technical Specifications

• The barrier provides two fully isolated channels per module.
• It maintains 28V maximum voltage rating per channel.
• Channels 1 and 3 deliver 93mA current limit capacity.
• All channels feature 50mA fuse protection for safety.
• End-to-end resistance measures 330Ω for channels 1 and 3.
• Channels 2 and 4 show 22Ω resistance with 0.9V drop.
• Each active channel dissipates only 0.65W for efficiency.

Device Compatibility & Applications

• The barrier works with 4-20mA transmitters and smart devices.
• It safely controls solenoid valves in hazardous locations.
• The unit supports LED indicators and alarm circuits.
• It is ideal for process control valve actuation systems.
• Perfect for flow meter signal conditioning applications.
• Reliable for explosion-proof lighting control circuits.

Unique Features & Advantages

• The barrier uses Schottky diode return path technology.
• This design eliminates the need for earth return connections.
• It supports bussed power configurations for simpler wiring.
• The compact twin-channel design saves valuable panel space.
• It carries both FM and BASEEFA/IIC safety certifications.

Cable Parameter Specifications

• Group IIC (BASEEFA): 0.13µF max capacitance, 4.2mH max inductance
• Groups A/B (FM): 0.12µF max capacitance, 2.31mH max inductance
• The L/R ratio is 55 µH/Ω for IIC applications
• These parameters ensure safe operation with various cable types

Installation Benefits

• The barrier simplifies wiring with integrated return path.
• It completely eliminates ground loop issues in systems.
• The design enables faster installation than single-channel barriers.
• It maintains excellent signal integrity in noisy environments.
• The unit is approved for Zone 0 and Division 1 hazardous areas.

Certification & Compliance

• The barrier carries FM certification for North American markets.
• It has BASEEFA/IIC certification for international use.
• The unit meets Zone 0 hazardous area requirements.
• It complies with Division 1 safety standards.

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