Bently Nevada 3300/47-09-03-01-00 Differential Expansion Monitor

Bently Nevada 3300/47 Complementary Input Differential Expansion Monitor - Technical Overview

1. Product Introduction

The 3300/47 Complementary Input Differential Expansion Monitor is a specialized solution from Bently Nevada’s Asset Condition Monitoring portfolio, engineered to address differential expansion measurement challenges in large-scale industrial machinery (e.g., turbines, generators). It enables extended monitoring ranges beyond the limits of single proximity probes, critical for detecting rotor-casing misalignment and preventing catastrophic contact.

2. Core Functionalities

2.1 Measurement Principle

Complementary Probe Arrangement: Uses two proximity probes to observe a rotor collar in a complementary configuration. When one probe reaches its linear range limit, the other probe takes over—extending the total monitoring range to double that of a single transducer.

Differential Expansion Monitoring: Measures the magnitude and direction of differential expansion between the rotor and casing, a key indicator of thermal or mechanical imbalance in large machines.

2.2 Alarming & Visualization

LCD Display: Real-time visualization of differential expansion magnitude and direction.

Four Alarm Setpoints: Configurable for two "over" and two "under" expansion conditions, enabling proactive alerts for abnormal motion.

3. Application Suitability

Ideal for large industrial machines (e.g., steam turbines, heavy-duty generators) where:

Conventional proximity probes lack sufficient linear range.

Machine size or design limits convenient probe mounting locations.

Extended monitoring ranges are critical to prevent rotor-casing contact.

4. Key Benefits

Extended Range: Doubles the linear monitoring range of standard proximity probes, eliminating blind spots in large machinery.

Early Fault Detection: Identifies differential expansion anomalies (e.g., uneven thermal growth, mechanical misalignment) before they escalate to rotor-casing rubs.

Configurable Alarms: Four setpoints (two over, two under) enable tiered warning systems for operational flexibility.

For detailed installation, calibration, or integration guidance, consult Bently Nevada’s official 3300/47 documentation or technical support.

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