Introduction
The part number 3500/20-01-02-00 refers to a specific configuration of a Vibration Monitor Module from the Bently Nevada 3500 Machinery Protection System. The suffix -01-02-00 defines its hardware revision and specific firmware. The associated number 125768-01 is often a top-level assembly or kit number.
This module is a core component of the 3500 system, designed to continuously monitor the health of critical machinery. It accepts input from two vibration transducers (typically proximity probes for relative shaft vibration or accelerometers) and provides continuous protection by comparing the vibration levels against user-configured alarm setpoints. If a dangerous condition is detected, it triggers alarms to shut down the machine (trip) or alert operators, thereby preventing severe damage.
Key Parameters
The following table outlines the key specifications for the 3500/20 Vibration Monitor Module.
| Parameter Category | Specification |
|---|---|
| Part Number | 3500/20-01-02-00 (Module) / 125768-01 (Assembly) |
| Function | Dual-Channel Vibration Monitor |
| Compatibility | Bently Nevada 3500 Series Racks |
| Input Channels | 2 independent channels |
| Input Signal | Accepts from Proximity Probes (for shaft vibration) or Seismics (for case vibration) |
| Dynamic Signal Range | • Proximitor Power: -2 V to -18 V DC • Gap Voltage: -2 V to -18 V DC |
| Key Measurements | Vibration (Peak-to-Peak in mils or µm), Gap Voltage, 1X Amplitude/Phase |
| Alarm Relays | Per channel: Danger (Trip), Alert (Warning), OK (Buffered) |
| Power Supply | Powered from the 3500 rack backplane |
| Operating Temperature | -30 °C to +65 °C (-22 °F to +149 °F) |
| Dimensions (H x W x D) | Approx. 193 mm x 57 mm x 200 mm (7.6 in x 2.25 in x 7.87 in) Standard 3500 module frame size |
| Weight | Approx. 0.8 kg (1.76 lbs) |
| Mounting | Slides into a slot in a 3500 series rack |
Application Scenarios
The 3500/20 module is a fundamental protection device used in a wide array of industries where the failure of rotating equipment can lead to catastrophic safety, environmental, or financial consequences. Its primary applications include:
Turbine Supervisory Instrumentation:
Steam & Gas Turbines: Monitors radial shaft vibration to detect unbalance, misalignment, or shaft instabilities. It is a critical safety system that automatically trips the turbine if vibration levels exceed safe limits, preventing a catastrophic failure.
Compressor Protection:
Centrifugal & Axial Compressors: Used in oil & gas, petrochemical, and refinery applications to protect high-value compressors. It guards against damage from subsynchronous vibrations, oil whirl, and other rotor-dynamic phenomena.
Large Pump and Fan Monitoring:
Monitors critical pumps in water treatment, power generation, and other process industries. It protects large induced draft (ID) and forced draft (FD) fans in power plants by detecting bearing failures and impeller issues.
Generator and Large Motor Protection:
Installed on large electric motors and generators to monitor shaft and bearing vibration, ensuring their reliable operation within safe mechanical limits.
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