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MTL introduces 9311-FB Fieldbus Barrier

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9311-FB Field Mounted Barrier Provides IS Spur Connections For FOUNDATION Fieldbus™ Or Profibus-PA

February 14, 2007 - Hampton, NH - MTL introduces a "second generation" of their Fieldbus Barrier wiring hub - the 9311-FB. The 9311-FB is a field-mounted unit that delivers intrinsically safe spur connections from a non-intrinsically safe trunk for connection to FOUNDATION fieldbus H1 or Profibus-PA field devices.

Key benefits include:

Intelligent power management

Flexible grounding options

Wide ambient temperature range of -40°C to ±75°C

When installed in a suitable enclosure, the 9311-FB can be installed in Zone 1 (gas) or Zone 2 (dust) hazardous areas, with the trunk wiring implemented using suitably protected cable and increased safety (Ex e) connection facilities. Each 9311-FB unit supports four intrinsically safe spurs, which can be connected to FISCO or "Entity" certified fieldbus devices in a Zone 1 or Zone 0 hazardous area. The spurs are short-circuit protected and each unit includes an optional fieldbus terminator by means of a linking plug.

The 9311-FB is bus-powered and requires no additional power supply in the field. Typically up to four 9311-FB units are connected to one hazardous area trunk, allowing up to 16 intrinsically safe fieldbus devices to be supported on the fieldbus segment. When used with a fieldbus host control system, power for the trunk can be provided by the MTL-Relcom F800 or FPS Series power supplies in redundant or non-redundant format. The 9311-FB module may be housed in a variety of field enclosures to suit end-user requirements. A range of standard, single-unit Glass Reinforced Polyester (GRP) and Stainless Steel (SS) enclosures are available as well as custom enclosures that can accommodate multiple Fieldbus Barriers together with field wiring terminals, surge protectors and live-disconnect switches.

A software calculator tool is available free of charge from MTL for the design of fieldbus segments using 9311-FB Fieldbus Barriers. The tool calculates the voltage and current levels in the segment according to input parameters including the number of Fieldbus Barriers connected, field device currents, cable length, cable cross section and power supply rating. Error conditions such as trunk overload are displayed.

About MTL
MTL has been serving the process and related industries since its formation in 1971. Today, the MTL Instruments Group plc, is a world leader in the development and supply of electronic instrumentation and protection equipment for the process control and telecommunications industries. Many of the world's most critical processes are monitored, controlled or protected by MTL equipment and the Group is distinguished by the quality and reliability of its products, its global network of sales-and-support centres and its acknowledged position as a thought-leader in this high technology marketplace. With 36 dedicated sales centres in 13 countries and a further 137 MTL representatives in 64 countries, MTL's expertise in Intrinsic Safety, Surge Protection, Open System Platforms and Operator Displays is unsurpassed.

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