1. Product Introduction: Bently Nevada 3500/45 140072‑04

The Bently Nevada 3500/45 140072‑04 is a four‑channel Position / Displacement Monitor Module in the 3500 machinery protection series. It is designed to monitor shaft and structural position phenomena including axial displacement, differential expansion, case expansion, and valve travel. It accepts a variety of position sensor inputs (such as LVDTs, proximity probes in some configurations, or potentiometers) and continuously evaluates the signals against user‑set thresholds. It is typically installed in a 3500 rack and works in concert with relay and output modules to provide machine protection, alarm, and diagnostic functions.

This variant (140072‑04) may differ from earlier versions (e.g. 140072‑02) in firmware, front connector layout, or minor performance refinements, but retains the core functional capabilities of the 3500/45 family.

2. Technical Specifications

Below is a table of the major parameters for 3500/45 140072‑04 (typical values where applicable):

3. Applications

The 3500/45 140072‑04 module is suited for any rotating or position‑sensitive machinery where precise displacement or expansion monitoring is critical. Common applications include:

• Axial Position Monitoring: For turbines, compressors, pumps — to detect axial movement of the shaft.

• Differential Expansion Monitoring: In machines with moving casings, to track relative displacement between machine components under thermal loading.

• Case Expansion / Deformation Monitoring: To detect casing distortion or thermal expansion under load.

• Valve Position / Actuator Feedback: Monitoring valve spool or actuator movement to ensure correct control.

• Protective Alarm Functions: Trigger alerts or shutdowns when movement exceeds safe limits.

• Trending & Diagnostics: Recording displacement history for predictive maintenance.

Industries and equipment types in which this module is often used:

• Fossil / Steam / Gas Turbines

• Large Centrifugal Compressors

• Pumps, Fans, Blowers

• Petrochemical Process Machinery

• Power Generation (conventional, cogeneration, combined cycle)

• Paper / Pulp, Mining, Heavy Industry

This module offers flexibility in retrofits, upgrades, and new installations, especially where multiple displacement sensors are required in one system.

4. Advantages & Key Features

• Multi‑channel capability: Handles four independent displacement channels in one module.

• Sensor flexibility: Compatible with AC/DC LVDTs and potentiometers, enabling adaptation to different transducer types.

• High signal fidelity: Includes built-in filtering and signal conditioning to reduce noise and interference.

• Programmable alarm logic: Users can set alert and danger thresholds, with multiple modes (e.g. differential, total, valve position).

• Real‑time monitoring: Continuous evaluation of position signals with buffered outputs for external use.

• Compact footprint: Takes minimal rack space while providing full functionality.

• System interoperability: Integrates seamlessly into the 3500 rack architecture alongside other modules for comprehensive machine protection.

• Reliability in industrial environments: Designed for harsh conditions with wide temperature and humidity tolerance.

5. Brand & Series

• Brand: Bently Nevada

• Series / Platform: 3500 Machinery Protection System

The 3500 series is a modular, field-proven platform for vibration, displacement, temperature, and process monitoring of critical rotating machinery.

6. Related / Alternative Models in Same Series or Domain

Below are five modules in the 3500 family or closely related functionally, with basic parameter comparison.

These modules broadly cover the spectrum of vibration, displacement, process, and hybrid monitoring, and they share compatible rack architecture.

7. Popular Models from the Same Brand (Bently Nevada)

Here are five well‑used or highly regarded modules (from the 3500 line or related lines) from the same brand, with parameter overviews: