Introduction to 3500/20-01-02-00 125768-01
The 3500/20-01-02-00 125768-01 is a critical monitoring module from the Bently Nevada 3500 Series, a globally recognized system for machinery protection. This specific model is a Dual Channel Radial Vibration Monitor.
Its primary function is to continuously monitor the relative shaft vibration of rotating machinery using data from eddy current proximity probes. It processes the raw signals to provide key vibration measurements (such as Peak-to-Peak amplitude) and the DC gap voltage, which indicates the average distance between the probe tip and the shaft. The module also typically includes a Keyphasor input, which is a timing reference essential for determining vibration phase and speed. If pre-configured vibration or gap voltage thresholds are exceeded, it triggers alarms to protect critical assets like turbines and compressors from damage. The "125768-01" is a specific hardware or firmware revision.
Technical Parameters
The following table details the key specifications for the 3500/20-01-02-00 module.
| Parameter | Specification |
|---|---|
| Product Family / Series | Bently Nevada 3500 |
| Module Type | Rack-Monitoring Module |
| Function | Dual Channel Radial Vibration Monitor |
| Compatible Sensors | Eddy Current Proximity Probes (e.g., 5 mm, 8 mm) |
| Key Measurements | Relative Shaft Vibration (Peak-to-Peak), DC Gap Voltage |
| Keyphasor Input | Yes (1 per module, used for phase reference) |
| Input Power | Powered by the 3500 Rack |
| Alarm Channels | Two dedicated alarm relays per channel (Alert and Danger) |
| Communication | Integrates with the 3500 framework; data accessible via the 3500/92 Communication Module |
| Operating Temperature | 0°C to +65°C (+32°F to +149°F) (Typical for control room environments) |
| Mounting | Installs in a 3500 Series rack |
| Approx. Dimensions (H x W) | 3 U (133.4 mm) x 1/4 Rack Width (Typical for a single-width 3500 module) * |
| Approx. Weight | ~ 1.0 kg (2.2 lbs) |
Note: The exact dimensions are defined by the rack slot it occupies.
Application Scenarios
This module is fundamental for monitoring the health and stability of shafts in high-speed, critical rotating equipment across various industries.
Power Generation: Protecting large steam and gas turbines in power plants by monitoring radial shaft vibration to detect imbalance, misalignment, and shaft instability, preventing catastrophic failure.
Oil & Gas: Safeguarding critical centrifugal and axial compressors on offshore platforms and in refineries by ensuring the shaft is running within its safe mechanical clearances.
Petrochemical & Refining: Monitoring high-speed machinery like synthesis gas compressors and turbo-expanders to provide early warning of mechanical faults, allowing for predictive maintenance.
Hydroelectric Power: Monitoring the shaft runout and vibration of large hydro-turbine generators to ensure operational stability and longevity.
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