Description

The 3500/40-02-01 is a full-height, 4-channel Proximitor Monitor module designed for the Bently Nevada 3500 Machinery Protection System. This module processes high-frequency signals from Bently Nevada proximity probe systems (such as the 3300 XL 5mm, 8mm, or 11mm series) to continuously monitor static and dynamic shaft parameters on critical rotating machinery.

It provides real-time tracking of radial vibration (shaft displacement), axial thrust position, eccentric motion, and casing expansion, serving as a primary defense against catastrophic bearing or rotor failure.

The part number breakdown for the -02-01 suffix specifies:

• -02 (I/O Module Type): 4-Channel Proximitor I/O Module with Internal Terminations
• -01 (Agency Approval Option): CSA/NRTL/C (Class 1, Division 2, Groups A, B, C, and D)

Technical Specifications

Field Application and System Integration Notes

Channel Configuration and Transducer Selection

The 3500/40-02-01 is highly configurable through the 3500 Rack Configuration Software. Each channel must be explicitly mapped to match the target physical probe’s Scale Factor (typically 7.87 V/mm / 200 mV/mil for standard 8mm proximity sensors).

• Radial Vibration: Typically configured in orthogonal pairs (X-Y orientation at 90° separation) to track the absolute centerline motion and orbital path of the shaft within its hydrodynamic journal bearings.
• Thrust Position: Configured with dual or triple redundancy (using multi-channel voting logic) to measure axial movement. Because thrust failures happen instantly and can cause catastrophic rotor-to-stator contact, accurate calibration of the electrical voltage null point during machine assembly is mandatory.

Front Panel Buffered Outputs and Diagnostics

The 4 front-mounted coaxial connectors provide direct, unfiltered access to the raw analog signal from each proximity sensor loop.

• Field Analysis: These ports allow diagnostic instruments (such as a Bently Nevada ADRE data acquisition system or portable FFT vibration analyzers) to be hot-plugged directly into the rack without disturbing the active machinery protection circuits or the 4 to 20 mA control loops.
• Sensor OK Circuitry: The monitor incorporates continuous Built-In Self-Test (BIST) diagnostics. If a field cable breaks or a proximity probe gets physically damaged, the system detects an out-of-bounds DC gap voltage, deactivates the “OK” status LED, and clamps the associated outputs to prevent false machine trips.

Functional Legacy Notice

Note: The 3500/40 series is a legacy hardware framework. For newer installations or modern system overhauls, it is often replaced or succeeded by the 3500/42M Proximitor/Seismic Monitor, which offers advanced programmable filtering capabilities and broader transducer compatibility.

Commercial and Procurement Data

• Product Condition: New Original (Factory Sealed) or Refurbished/Tested Legacy Surplus (includes multi-channel calibration verify reports).
• Standard Warranty: 12-month comprehensive depot hardware warranty.
• Estimated Lead Time: In-stock modules generally ship globally within 1 to 3 business days.
• Pricing Notice: Price is indicative and highly dependent on active market availability, regional Class 1 Div 2 compliance documentation, and structural supply chain cycles. Contact our technical sales division for a formal commercial proposal.