3500/40M Proximitor® Monitor

Overview

The Bently Nevada 3500/40M Proximitor® Monitor is the standard eddy-current proximity-probe monitor for the 3500 machinery protection system. It continuously conditions proximity transducer signals, derives vibration/position parameters in engineering units, compares them against programmable Alert/Danger setpoints, and publishes high-resolution data to the rack interface for diagnostics—delivering protection and condition-monitoring in one module. The 40M is a four-channel monitor; each channel is independently configurable and integrates cleanly with the 3500 Rack Configuration Software and System 1 environment via the rack interface. 

What it Measures (per-channel functions)

Each channel can be assigned one of the standard proximity functions used on rotating assets, allowing the same module to cover multiple roles in a train: Radial Vibration, Thrust Position, Differential Expansion, Eccentricity, and REBAM (rolling-element bearing absolute measurement). This flexibility lets you combine two radial bearings plus a thrust channel in a single card, or deploy special mixes for steam-turbine DE/thermal growth monitoring—without changing hardware. 

Protection & Alarming

The 40M continuously evaluates derived static values (overall, gap/position, etc.) and applies user-programmable Alert/Danger thresholds with time delays and latching options. Alarms are time-stamped and made available to the rack for relays and event logs, supporting both automatic trips and fast root-cause analysis. 

Data for Diagnostics (System 1)

In addition to protection, the 40M provides the dynamic signal path that enables waveforms, orbits, and trends in System 1 when the rack is equipped with a Transient Data Interface (3500/22M TDI). This pairing preserves protection independence in the monitors while streaming static/dynamic/transient data over Ethernet for condition-based maintenance. 

Integration & Operation

• 4-channel card, hot-swappable in the 3500 rack; front LEDs report OK/fault status.

• Accepts Bently Nevada proximity transducers (eddy-current) and scales them to engineering units.

• Configured with 3500 Rack Configuration Software; data collection and remote work through System 1 via the TDI.

• Part of a modular system designed to meet API 670 requirements for machinery protection. 

Typical Applications

Compressor radial vibration and thrust position; steam/gas turbine radial/DE/thermal growth; large motors/generators shaft vibration; critical pumps and fans requiring API-class protection with deep diagnostics. 

Compatibility & Ordering Notes

Provide your probe model/cable lengths, intended channel mix (e.g., 2× radial + 1× thrust), and System 1/TDI details so we can confirm firmware compatibility and I/O. If you are upgrading from older 3500 monitors, we’ll validate slot positions and alarm philosophy to match your site standard. 

What’s Included 

3500/40M Proximitor® Monitor module only. Probes, I/O modules, rack hardware, and cabling are quoted separately.

Call to Action

Need the right channel set, probe lengths, or DE/thrust configuration for your machine? Send your rack BOM and rotor layout—Seven Star LLC will validate the setup, confirm availability/lead time, and offer the best regional pricing.