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Description
3500 Internal Barriers are intrinsically safe interfaces that provide explosion protection for transducer systems connected directly to the 3500 Machinery Protection System.

The internal barriers are fully compatible with the 3500 System and provide a convenient and cost-effective solution for installing all types of transducer systems within a hazardous area.

Unlike external barriers, 3500 Internal Barriers are an integral part of the 3500 System and will not degrade the system's performance.

We offer Bently Nevada transducer systems with comprehensive approvals for hazardous area installations. The transducer systems are matched to those of the 3500 Internal Barriers. See Compatible Monitors and Transducers on page 6.

Each component complies both individually and as part of a system with the safety requirements of North American and international standards. Hence, you don't have to reference individual certificates to verify the compatibility between components.

Standard and internal barrier monitors can reside within the same 3500 rack. You can upgrade standard monitors by replacing existing I/O modules with those that contain internal barriers.

Installation Guidelines
The internal barriers for a 3500 rack are incorporated in special Monitor I/O Modules. These barriers provide explosion protection for transducer systems that are connected to the 3500 system. An intrinsically safe (IS) earthing module provides the IS earth connection through the 3500 system backplane.

The IS Earth Module requires a dedicated I/O module position and precludes the use of this monitor position for other 3500 System modules. This limits a standard 19-inch rack to 13 monitor positions. Furthermore, a number of installation options are not available when internal barriers are installed in a 3500 rack.

New Rack Installations
The same rack can contain both internal barrier and standard I/O module types without compromising the separation between hazardous and safe area field wiring.

The External Termination option is not available for I/O modules with internal barriers because
hazardous area approvals do not allow the use of intrinsically safe wiring within a multi-cored
cable assembly.

Monitors that contain Triple Modular Redundant (TMR) rack options cannot use internal barrier I/O modules since connecting a transducer to multiple I/O module inputs will compromise the integrity of the IS system.

A rack that contains any internal barrier module must have a 3500/04-01 IS Earthing Module to provide the Barrier Module IS earth connection.