Product Introduction
The configuration 3500/42M 176449-02 + 128229-01 represents a specialized Bently Nevada 3500 System setup for monitoring Thrust Position on large rotating machinery. This system is designed to precisely measure and protect against axial displacement of a rotor, which is critical for preventing catastrophic damage from rotor-to-stator contact.
3500/42M: This is the core Dual Channel Thrust Position Monitor module. It accepts signals from two opposing proximity probes to measure the axial movement of a thrust collar or rotor. The "M" variant often indicates a modular or enhanced version with specific features like 4-20mA outputs.
176449-02: This is typically a Junction Box or Termination Assembly. It provides a robust, environmentally protected interface point for wiring the proximity probes to the monitoring system.
128229-01: This is a 3300 XL 8mm Proximity Probe System. It includes the proximity probe, extension cable, and proximitor (driver) necessary to generate the gap voltage signal for the monitor.
Together, they form a complete, integrated solution for monitoring axial thrust bearing wear and detecting abnormal rotor float.
Technical Parameters & Specifications
| Parameter Category | Specification |
|---|---|
| Core Module | 3500/42M Dual Channel Thrust Position Monitor |
| Primary Function | Monitors axial position of a rotor using two opposing proximity probes. Calculates differential expansion (position) and provides alarm trips. |
| Input Signals | Two -7.87 V/mm (-200 mV/mil) analog signals from 3300 XL series proximity probes (like 128229-01). |
| Key Parameters Monitored | • Thrust Position (Differential or Individual Channel) • Gap Voltage for each probe • Dynamic Peak-to-Peak vibration (optional) |
| Alarm Capabilities | Two programmable alarm levels (Alert and Danger) per channel for position, plus gap voltage alarms (e.g., Probe Fault). |
| Outputs | Two 4-20mA outputs (typically for each channel's position) and relay alarm outputs. |
| Power Supply | +24 VDC from the 3500 system rack. |
| Probe System (128229-01) | 3300 XL 8mm Proximity Probe, standard 5m cable length (verify length from PN), sensitivity -7.87 V/mm. |
| Junction Box (176449-02) | Typically a NEMA 4/IP66 rated enclosure for field wiring termination. |
| Dimensions (Module) | 206 mm x 52 mm x 258 mm (8.1 in x 2.05 in x 10.15 in) - Standard 3500 series single-slot module. |
| Weight | Approx. 1.1 kg (2.4 lbs) for the complete kit (module, probes, junction box, and cables). • Module only: ~0.9 kg (2.0 lbs) • Junction Box & Probes: ~0.2 kg (0.4 lbs) additional. |
| Operating Temperature | Module (in rack): 0°C to +65°C (+32°F to +149°F). Probe: Up to 177°C (350°F) for standard versions. |
| Compatibility | Designed for installation in a 3500 series rack (e.g., 3500/15, 3500/25). |
Application Scenarios
This specific thrust position monitoring system is essential in industries where axial load management is critical for machine safety and longevity:
Steam Turbines & Generators: The primary application. Precisely monitors thrust bearing wear to prevent the rotor from moving axially into the stationary components (diaphragms, seals), which could cause a catastrophic rub. Critical during start-up, shutdown, and load changes.
Gas Turbines (Industrial & Aero-derivative): Monitors axial displacement caused by thermal expansion and thrust loads, protecting compressor and turbine stages.
Centrifugal & Axial Compressors: Used in refinery, petrochemical, and pipeline services to monitor thrust balance and detect issues like thrust bearing failure, which can destroy the rotor in seconds.
Large Pumps (Boiler Feed, Pipeline): Monitors axial movement in multi-stage pumps to prevent internal wear ring contact and impeller damage due to thrust imbalance.
Hydro Turbines: Monitors axial movement of the runner and shaft assembly.
Global direct procurement guarantee
All products are purchased directly from overseas original manufacturers or authorized channels, 100% guaranteed genuine quality, sufficient spot inventory, and comprehensive model coverage
Quality Commitment
Each product has been tested by our technicians, providing 12-month long warranty, worry-free after-sales
Flexible procurement plan
- Bulk order enjoys Friendship discount (2 pieces or more can be applied)
- Long-term cooperative customers can apply for priority supply
Full service support
7×24 hours technical consultation, from selection guidance to installation and commissioning to provide full life cycle service (paid)
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On the basis of the same quality, we provide:
- More competitive price system
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- More complete technical support (free product technical documentation)
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