Bently Nevada 3300/45-03-02-00-00 Dual Differential Expansion Monitor

Bently Nevada 3300/45 Dual Differential Expansion Monitor - Technical Overview

1. Product Introduction

The 3300/45 Dual Differential Expansion Monitor is a key component of Bently Nevada’s Asset Condition Monitoring portfolio, designed to measure the axial position of a rotor relative to the machine casing (differential expansion) at a distance from the thrust bearing. It is critical for detecting axial clearances and thermal expansion changes in rotating machinery (e.g., turbines), enabling early fault prevention.

2. What is Differential Expansion?

Differential Expansion refers to the axial position of the rotor relative to the machine casing, typically measured via a proximity probe transducer mounted on the casing and observing an axial surface (e.g., rotor collar). Changes in axial position affect axial clearances and usually result from thermal expansion during startup/shutdown.

3. Core Functionalities

3.1 Monitoring Capabilities

Dual-Channel Monitoring: Provides continuous differential expansion measurement for two independent channels.

Magnitude & Direction Tracking: Monitors both the size and direction of differential expansion for each channel.

Configurable Alarms: Four alarm setpoints per channel (two "over" and two "under" alarms), with the option to turn off Channel B for single-location measurement needs.

3.2 Application Integration

Integrates into Turbine Supervisory Instrumentation systems, enabling comprehensive axial motion monitoring for turbines and other high-speed rotating equipment.

4. Front-Panel Interface

Analog Meters & LEDs: Real-time visualization of differential expansion levels, with status indicators for OK, ALERT, DANGER, and BYPASS.

Buffered Outputs: Isolated outputs for signal distribution to external systems (e.g., control rooms, data loggers).

For detailed specifications, installation guidelines, or integration support, refer to Bently Nevada’s official 3300/45 documentation or technical services.

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