MTL has released the 9311-FB fieldbus barrier. This fieldbus barrier is a field-mounted wiring hub that creates intrinsically safe spur connections from a non-intrinsically safe trunk, for connection to Foundation Fieldbus H1 or Profibus-PA fieldbus field devices. It may be installed in a zone 1 (gas) or zone 21 (dust) hazardous area, with the trunk wiring implemented using suitably protected cable and increased safety (Ex e) connection facilities. Each unit supports four intrinsically safe spurs, which may be connected to FISCO or 'Entity' certified fieldbus devices in a Zone 1 or Zone 0 hazardous areas. The spurs are short circuit protected. Each unit includes an optional fieldbus terminator by means of a linking plug.
The 9311-FB Fieldbus barrier is bus-powered and requires no additional power supply in the field. Typically, up to three 9311-FB units may be connected to one hazardous area trunk, allowing up to 12 intrinsically safe fieldbus devices to be supported on the hazardous area segment.
When used with a fieldbus host control system, power for the trunk may be provided by the MTL-Relcom FPS Series power supplies in redundant or non-redundant format. For F800-based power supply systems, the F802 power module will provide a high output voltage and current, making it ideal for use with the 9311-FB.
This module may be housed in a variety of field enclosures, to suit end-user requirements. A range of standard, single-unit glass reinforced polyester and stainless steel enclosures will be available for smaller projects. A custom systems capability will satisfy projects that require more than one fieldbus barrier per enclosure or ancillary components.
For more information contact K.V. Dahya, Extech Safety Systems, +27 (0)11 791 6000, [email protected]
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