Product Introduction: 3500/22 288055-01 + 146031-02
The 3500/22 288055-01 and 146031-02 together form a Thrust Position Monitor and Transducer Kit for the Bently Nevada 3500 Machinery Protection System. The 3500/22 is the main monitoring module, designed specifically to monitor the axial position of a rotor (thrust position) using signals from eddy current proximity probes. The 146031-02 is a kit that includes the necessary Dual Proximity Probes, cables, and hardware required for the installation.
This system is critical for detecting excessive axial movement of a rotor within its casing, which can indicate problems with thrust bearings, such as wear or failure. Monitoring thrust position is essential for preventing catastrophic damage like rotor-to-stator rubbing in machines like turbines and compressors.
Technical Parameters
The table below outlines the key parameters for both the module and the transducer kit.
| Parameter Category | Specification |
|---|---|
| Part Number Set | 3500/22 288055-01 (Module) + 146031-02 (Transducer Kit) |
| Module Function | Thrust Position Monitor |
| Transducer Type | Dual Eddy Current Proximity Probes (typically 5 mm or 8 mm) |
| Input Channels | 2 channels (requires two probes for differential measurement) |
| System Gap Measurement Range | Typically -2 V to -18 V DC per probe. |
| Thrust Position Measurement Range | User-configurable, typically in mils or microns. |
| Module Dimensions (H x W x D) | Approx. 190 mm x 60 mm x 140 mm (7.5 in x 2.4 in x 5.5 in) [Standard 3500 rack slot] |
| Module Weight | Approx. 0.7 kg (1.5 lbs) |
| Probe Dimensions (from Kit) | Typically 5 mm or 8 mm diameter by 40-60 mm length, plus cable. |
| Kit Weight (146031-02) | Approx. 1.0 - 1.5 kg (2.2 - 3.3 lbs) depending on cable length. |
| Mounting | Module slots into a 3500 series rack. Probes mount in threaded holes on the machine case, opposing each other on the thrust collar. |
| Operating Temperature (Module) | 0°C to +65°C (+32°F to +149°F) |
| Operating Temperature (Probe) | -40°C to +177°C (-40°F to +350°F) |
| Key Features | • Differential measurement for high accuracy • Monitors thrust bearing wear • Provides OK, Alert, and Danger alarms • Kit provides all necessary components for sensor installation. |
Note: The module dimensions are standard for a 3500 series frame. The exact probe specifications and cable length are defined by the kit's full part number.
Application Scenarios
The 3500/22 Thrust Position Monitoring System is vital for protecting any machine with a significant axial load. Its primary application scenarios include:
Steam and Gas Turbines: Monitoring the axial position of the rotor to protect against thrust bearing failure, which can cause the entire rotor to shift and contact stationary components.
Centrifugal Compressors: Essential for detecting changes in axial thrust that can occur due to pressure imbalances across impellers, indicating potential bearing wear or failure.
Large Pumps and Fans: Protecting equipment where axial thrust is a factor in the machine's operation and reliability.
Marine Propulsion Systems: Monitoring thrust bearings in ship propulsion systems.
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