Product Introduction: 3500/50-01-00-01 133388-02
The 3500/50-01-00-01 133388-02 is a specific hardware version of the Axial Position Monitor module from the Bently Nevada 3500 Machinery Protection System. This dual-channel module is designed to monitor the axial (thrust) position of a machine's rotor relative to its casing. It is a critical protection component, typically using two non-contact eddy-current proximity probes to measure the position of the thrust collar. By monitoring this parameter, it helps prevent catastrophic damage caused by excessive rotor float, which can lead to thrust bearing failure and rotor-to-stator contact.
Technical Parameters
The key technical specifications for the 3500/50-01-00-01 133388-02 module are summarized in the table below.
| Parameter | Specification |
|---|---|
| Part Number | 3500/50-01-00-01 133388-02 |
| System | Bently Nevada 3500 |
| Module Type | Axial Position Monitor (Dual-Channel) |
| Dimensions (H x W x D) | 190 mm x 55 mm x 120 mm (Standard 3500 Rack Slot) |
| Weight | 0.48 kg |
| Input Channels | 2 (for redundant or differential measurement) |
| Input Signal | Accepts signals from eddy-current proximity probes |
| Measurement Parameter | Thrust Position |
| Measurement Range | User-configurable, typically 0 to 100 mils (0 to 2.5 mm) |
| Dynamic Range | 80 dB |
| Alarm Setpoints | Two user-configurable levels per channel (Alert and Danger) for both forward and reverse thrust |
| Outputs | 4-20 mA proportional output for position (per channel) |
| Power Supply | Powered by the 3500 Rack; +24 VDC from the rack's power supply |
| Operating Temperature | -20°C to +65°C |
Application Scenarios
The 3500/50 monitor is essential for protecting machinery where axial thrust is a critical failure mode.
Steam and Gas Turbines:
Monitors the axial position of the turbine rotor to prevent catastrophic damage from excessive thrust bearing wear or failure, which can occur due to load changes or steam/combustion forces.
Centrifugal Compressors:
Critical for detecting changes in axial thrust caused by varying process conditions, internal seal wear, or impeller fouling, protecting the compressor from severe internal damage.
Large Pumps and Fans:
Used on high-power, single-stage pumps and fans to monitor thrust bearing wear and detect conditions like impeller imbalance that can induce axial load.
Redundant Thrust Monitoring:
The dual-channel design allows for a redundant configuration, ensuring continuous protection even if one probe or channel fails, which is a critical requirement for high-availability systems.
Marine Propulsion Systems:
Protects the main thrust bearings of marine propulsion systems from overload, which is vital for operational safety and machinery integrity.
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