MTL5053 Fieldbus Intrinsic Safety Barrier
The MTL5053 is an isolator/power supply module specifically developed to extend 31.25kbit/s (H1) FOUNDATION Fieldbus networks into hazardous areas. It provides intrinsically safe power and communication to fieldbus devices powered through the signal conductors, complying with Fieldbus Foundation specifications for IS power supply (Type 133). The module allows fieldbus instruments to be located in Zone 0, IIC, T4-6 hazardous areas when suitably certified, enabling process control in the most demanding environments.
Technical Specifications
Product Type: Fieldbus isolator / IS power supply
Data Rate: 31.25 kbit/s (H1)
Location of Fieldbus Device(s): Zone 0, IIC, T4-6 hazardous area
Hazardous-Area Fieldbus Power Supply: 18.4V ± 2%, 105Ω ±3% DC impedance, 80mA maximum current
Maximum Cable Length: Determined by IS requirements, device power consumption, and voltage drop
Digital Signal Transmission: Compatible with 31.25kbit/s fieldbus systems, complies with fieldbus standards
Supply Voltage: 20 to 35V DC
LED Indicator: Green: power indication
Power Requirement (Vs) with 80mA output load: 135mA typical at 24V, 105mA at 35V
Power Dissipation within unit (with 80mA output load): 2.3W typical at 24V, 2.6W maximum at 35V
Isolation: 250V AC between safe- and hazardous-area circuits and power supply
Internal Terminator: Switch-selectable on top of module
Safety Description (Terminals 1 and 2): 22V, 102Ω, 216mA; Um = 250V rms or DC
Mounting: Horizontal DIN rail (recommended with 10mm spacing between adjacent units)
Operating Temperature (optimum orientation): 0°C to 60°C (reduced to 45°C for non-optimum orientation)
MS010 DIN-rail module spacers: Available for proper heat dissipation
Fieldbus Intrinsic Safety
The MTL5053 provides the power and communication interface between a safe-area fieldbus segment and hazardous-area fieldbus devices. It limits the energy delivered to the hazardous area to intrinsically safe levels, allowing fieldbus instruments to be installed in Zone 0 (gas) and Zone 20 (dust) environments. The module includes a switch-selectable internal terminator for installations where the safe-area bus length is short. The device must be installed on a horizontal DIN rail mounted on a vertical surface with 10mm spacing between adjacent units for adequate heat dissipation. The MTL5053 complies with Fieldbus Foundation requirements for IS power supply Type 133†.
Application Domains
The MTL5053 is used in FOUNDATION Fieldbus H1 segments in oil and gas production facilities, chemical plants, pharmaceutical manufacturing, power generation, and refining. It enables the use of fieldbus instruments in hazardous areas while maintaining the full functionality of the fieldbus network, including device configuration, diagnostics, and real-time process data.
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