MTL5541 Galvanic Isolated Barrier

The MTL5541 is a 1-channel galvanic isolated barrier from the MTL5500 Series, designed to provide intrinsic safety for 2- or 3-wire 4-20mA transmitters located in hazardous areas (Zone 0, IIC, T4-6). It supplies fully floating DC power to the transmitter and repeats the current in the isolated output circuit, eliminating the need for a high-integrity earth ground required by traditional shunt diode safety barriers. The module is HART transparent, allowing 2-way HART communication for 2-wire transmitters installed in hazardous areas.

Intrinsic Safety and Galvanic Isolation

The MTL5541 provides total intrinsically safe isolation for communication with transmitters approved for use in hazardous areas. Its galvanic isolation eliminates the need for a high integrity earth ground required when using shunt-type diode safety barriers. The module is suitable for 2 and 3 wire temperature transmitters located in hazardous areas and supports HART communication for 2-wire transmitters installed in hazardous areas. The device features 3-port isolation as standard, with isolation between safe- and hazardous-area terminals at 250V RMS, tested at 1500V RMS minimum, and 50V isolation between safe area and power supply. The hazardous-area input accepts 0 to 24mA including over-range.

Application Domains

The MTL5541 is used in chemical and petrochemical plants for isolating 4-20mA loops in hazardous areas, oil and gas facilities for monitoring pressure and temperature transmitters, pharmaceutical manufacturing for sterile process monitoring, power generation for turbine and boiler instrumentation, and water/wastewater treatment for chemical dosing and level monitoring.