Product Details Supplier Info More products

MTL Instruments has launched a range of Fieldbus Barrier wiring hubs for connecting intrinsically safe field instruments to Foundation fieldbus networks in hazardous areas.

The 9370-FB Series Fieldbus Barrier is said to retain the features of the ‘High Energy Trunk’ technique while removing the drawbacks associated with existing Fieldbus Barrier implementations, resulting in lower costs, safer operation and higher reliability throughout the lifecycle of the fieldbus network.

The 9370-FB Series is modular in construction, comprising of a fixed carrier assembly and pluggable components.

These are assembled to form complete, self-contained enclosure systems in either stainless steel or carbon-loaded GRP and sized according to the application requirements.

A key feature of the 9370-FB is the speed in which it can be reconfigured or repaired.

All parts of the system containing complex electronic circuits are housed in ‘pluggable’ modules that can be removed and replaced while the equipment is live.

This is a sharp contrast to conventional Fieldbus Barrier implementations, where serviceability is made difficult or impossible by the ‘hard-wired’ nature of the field enclosure, which cannot be live worked in the hazardous area.

Tracing and fixing faults is also made easier as rapid substitution can be used to pinpoint the source of problems.

The barrier modules, terminator and optional surge protection devices are all certified for removal and replacement in the hazardous area without causing an ignition risk, providing the ability for expansion in service.

For example, a 12-spur enclosure, fitted with one six-spur module, can be optionally specified and installed; expansion to 12 active spurs can be accomplished by plugging a second module into the enclosure.

No other configuration is necessary, provided the fieldbus power supply is correctly sized and the full loading of the segment has been anticipated.

Optional, integrated surge protection is also a key feature of the 9370-FB Series and it includes plug-in devices to protect the barrier modules from transients transmitted along the trunk and spur cables.

In conjunction with additional protectors located at the fieldbus host and at the fieldbus instruments, they allow the user to install and operate fully protected networks.

The plug-in surge protection devices can be included at the time of installation or retrofitted once the system is in service.

This streamlines the selection process, avoids over specification and allows protection to be added in response to site experience.

View full profile