Product Overview

The Bently Nevada 135489-01 is a 3500/42M 4-Channel Proximitor®Monitor Module,part of the 3500 Machinery Protection System by Bently Nevada(Emerson).This module is designed to accept input from up to four Bently Nevada proximity probe systems(e.g.,3300 XL or 3300 NSv sensors)to continuously monitor radial vibration,axial position(thrust),or differential expansion on critical rotating machinery such as turbines,compressors,pumps,and generators.

The“M”in 3500/42M denotes the“Modular”or enhanced version with improved diagnostics,flexible alarm logic,and compatibility with modern digital communication protocols via the 3500 rack interface.

🔹Note:The 135489-01 is the monitor module only—it requires external Proximitor sensors(e.g.,176999-01)and probes(e.g.,132419-01)to form a complete measurement loop.

Technical Specifications

Parameter Value

Manufacturer Bently Nevada(Emerson)

Model 3500/42M

Part Number 135489-01

Channels 4 independent channels

Input Type Buffered-24 V DC output from 3300 XL/NSv Proximitor sensors

Measurement Types•Radial vibration(peak-to-peak)

•Axial position(DC gap)

•Differential expansion

•Keyphasor reference(if configured)

Frequency Range 0–1 kHz(standard),up to 10 kHz with high-frequency option

Alarm Outputs 2 programmable relay outputs per channel(Alert&Danger)

Relay Type Form C(SPDT),isolated

Relay Ratings 2 A 30 V DC;1 A 120 V AC(resistive)

Communication Via 3500 backplane to 3500/15 or/15E Rack Interface Module

Configuration Using 3500 Rack Configuration Software(Windows-based)

Diagnostics Probe OK,sensor health,open/short detection,gap voltage monitoring

Mounting Occupies one slot in 3500 chassis

Power Supplied via 3500 backplane(±24 V DC)

Approvals CSA,CE,ATEX,IECEx(when installed in certified rack)

Compliance API 670(5th Edition),IEC 61508(for protection functions)

Key Features&Functions

✅True Peak-to-Peak Vibration Measurement

Unlike RMS-based sensors,the 3500/42M captures actual shaft orbit amplitude—critical for detecting rubs,looseness,or resonance in journal bearings.

✅Dual Alarm Relays per Channel

Each channel provides independently configurable Alert(warning)and Danger(trip)relays for integration into shutdown systems or DCS alarms.

✅Advanced Diagnostics

Monitors gap voltage,sensor health,and cable integrity in real time.Alerts if a probe is shorted,open,or out of calibration range.

✅Flexible Signal Processing

Supports:

Dynamic(AC-coupled):for vibration

Static(DC-coupled):for thrust position

High-pass/low-pass filtering to reject noise or focus on specific fault frequencies

✅Seamless Integration

Data is accessible via Modbus RTU/TCP(through 3500/15E),OPC,or Emerson’s AMS Machinery Health Manager for predictive maintenance.

Typical Applications

Steam Turbines:Radial vibration on HP/IP/LP sections+thrust position

Centrifugal Compressors:Journal bearing vibration monitoring

Motor-Driven Pumps:Early detection of imbalance or misalignment

Gearboxes:Input/output shaft position tracking

Paper Mill Rolls:Differential expansion monitoring

Often used alongside:

3500/25(Speed Input)

3500/15E(Ethernet Rack Interface)

3500/50(Overspeed Protection)

3300 XL Probes&Proximitors

Related Products

Product Description

135489-02 Same module with different firmware or regional variant

3500/40 Legacy 2-channel version(non-M)

3500/45 2-channel high-frequency vibration module

176999-01 3300 XL 8 mm Proximitor(required companion)

132419-01 3300 XL 8 mm probe

3500/15E(135040-02)Ethernet-enabled rack interface for data access

Installation&Maintenance Notes

🔧Installation:

Install in any available slot(except Slot 1)of a 3500 chassis.

Ensure total probe+extension cable length=5.0 m or 9.0 m(standard calibrated lengths).

Use twisted,shielded cable;ground shield at monitor end only.

🛠️Maintenance:

Verify gap voltage during commissioning(~–10 V DC at mid-range).

Test relay operation during safety system functional checks.

Back up configuration files(.rcf)before any rack modification.

⚠️Critical Note:While the 3500/42M provides relay outputs,final trip actions for life-safety or catastrophic failure should be validated per API 670 and may require voting logic(e.g.,3500/53)or SIL-rated modules.

Warranty&Support

The 135489-01 is backed by Emerson’s standard 2-year warranty and global technical support.As a core component of the 3500 platform,it benefits from Bently Nevada’s long-life commitment—units installed in the 1990s are still supported today.

Summary

The Bently Nevada 3500/42M Monitor Module(135489-01)is a high-integrity,4-channel solution for continuous machinery protection using proximity probe technology.Combining precision measurement,robust alarm logic,and deep diagnostics,it remains a gold standard in industries where unplanned downtime carries severe operational,financial,or safety consequences.When integrated into a full 3500 system,it delivers actionable insights that protect both assets and personnel.

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