BENTLY 3500/04 Internal Barriers

BENTLY 3500/04 Internal Barriers

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.

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.

I/O Module Positioning

Internal barrier I/O modules have an increased depth over that of standard barrier I/O modules. Consider the rack position with respect to adjacent modules to ensure that you can easily access the I/O modules during maintenance.

Internal barrier I/O and IS Earthing modules can occupy any general-purpose rack position and can be adjacent to standard I/O module types without compromising the 50 mm (2 in) physical separation requirement between safe and hazardous area field wiring.

Follow these guidelines when positioning I/O modules:

· Group all internal barrier I/O modules in adjacent rack positions to simplify the installation. 

· Place the IS Earthing Module in a rack position that provides easy access for routine online maintenance. 

· Consider the IS Earthing Module's positioning relative to adjacent internal barrier I/O modules and cabinet bulkheads.

Cabinet and Panel Installations

The internal barrier I/O modules add approximately 50 mm (2 in) to the depth of the rack to provide the 50 mm (2 in) physical separation between safe and hazardous area field wiring. Hence, a standard rack with internal barrier modules will not fit into a 400 mm cabinet.

The bulkhead rack version is available for installations that require this cabinet type. A standard rack with internal barrier modules will fit comfortably in a 600 mm cabinet and the 3500/06 Weatherproof Housing.

We recommend the following installation guidelines for the internal barriers within a cabinet or panel:

· The positioning of the hazardous and safe area connectors dictates installations route the hazardous area field wiring above the 3500 rack and safe area wiring below the 3500 Rack. 

· Installations should carefully route the safe area wiring from the bulkhead version along the top of the 3500 rack to maintain the 50 mm (2 in) separation between safe and hazardous area wiring.

Compliance and Certifications FCC

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:

· This device may not cause harmful interference. 

· This device must accept any interference received, including interference that may cause undesired operation.

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