Bently Nevada 3500/40M 135489-04 Proximitor I/O Module with Internal Barriers and Internal Terminations

Bently Nevada 135489-04 I/O Module With Internal Barriers And Internal Terminations

The Bently Nevada 135489-04, also cataloged as the 135489 Proximitor I/O Module, serves as a rear-mounted termination unit with integrated intrinsic safety barriers for proximity probe inputs in the 3500/40M Proximitor Monitor system.

Hardware Specifications

Intrinsic Safety Barriers and Galvanic Isolation

The 135489-04 integrates intrinsic safety barriers directly into the I/O module, eliminating the need for external isolators when connecting probes in hazardous areas. Galvanic isolation ensures that sensor signals remain electrically separated from rack electronics, preventing cross-channel interference and maintaining deterministic displacement measurements. This design supports compliance with hazardous area certifications while simplifying installation.

Frequently Asked Questions (FAQ)

Q: Can the 135489-04 module be used with all proximitor probe sizes? A: Yes. It supports 5 mm, 8 mm, 11 mm, and 25 mm 3300 XL Proximitor systems.

Q: Does the module require external isolators for hazardous areas? A: No. Internal intrinsic safety barriers provide direct compliance for Class I, Div 1 and Zone 0/1 installations.

Q: How is power supplied to the module? A: Power is delivered through the 3500 backplane, with nominal consumption of ~11.2 W for the monitor pair.

Field Installation Guidelines

• Install the module in the designated rear I/O slot of the 3500 rack.
• Ensure probe wiring is routed through the integrated grommet and terminated securely.
• Maintain shield grounding at the rack end only to avoid circulating currents.
• Confirm hazardous area compliance by verifying barrier integrity before energizing.
• Route proximity probe cabling separately from high-voltage conductors to minimize induced noise.
• Verify environmental conditions meet specified operating and storage ranges.