Introduction
The 3500/15 133300-01 is a critical monitoring module within the Bently Nevada 3500 Machinery Protection System, a premier platform for safeguarding industrial equipment. Specifically, this part number refers to a Dual-Channel Velocity Input / Seismic Monitor Module. It is designed to accept signals from velocity transducers (seismometers) and convert them into standardized vibration signals for monitoring, alarming, and shutdown functions to protect assets like fans, pumps, and motors.
Technical Parameters
The key technical specifications, including physical dimensions and weight, are summarized in the table below.
| Parameter Category | Specification |
|---|---|
| Model / Part Number | 3500/15 133300-01 |
| System/Platform | Bently Nevada 3500 Series Rack |
| Module Type | Dual-Channel Velocity Input Monitor |
| Slot Compatibility | Occupies a single slot in a 3500 Series rack. |
| Input Type | Accepts signals from passive or industrial velocity transducers (typically 100 mV/in/sec or 100 mV/mm/s sensitivity). |
| Input Channels | Two (2) independent channels. |
| Frequency Range | Typically 4.5 Hz to 1,000 Hz (270 to 60,000 CPM). |
| Dynamic Range | Up to 2.0 in/sec (50 mm/sec) peak velocity. |
| Outputs | Provides buffered sensor signals, 4-20 mA proportional outputs (per channel), and relay contact outputs for Alarm and Danger (per channel). |
| Power Supply | Powered from the 3500 rack backplane. |
| Key Features | Includes continuous self-test, programmable alarm setpoints, integration to displacement (optional), and DIN/ISO compliance for casing vibration. "133300-01" is a specific hardware assembly code. |
| Dimensions (H x W x D) | ~193 mm x 48 mm x 170 mm (Standard 3500 1/2-slot module size). |
| Weight | ~0.5 kg (Approximate). |
| Operating Temperature | 0°C to 65°C (32°F to 149°F). |
Application Scenarios
This module is essential for monitoring the casing or structural vibration of rotating machinery where shaft-relative measurement is not feasible or must be supplemented:
Low/Medium-Speed Machinery: Ideal for motors, fans, pumps, blowers, and gearboxes where the primary vibration frequencies fall within its effective range.
Machine Casing/Bearing Cap Monitoring: Directly measures the absolute vibration of the machine structure using mounted velocity transducers to assess overall mechanical health.
Industrial Fans & Blowers: Widely used in power plants, refineries, and HVAC systems to detect imbalance, misalignment, or structural resonance in large fan assemblies.
Electric Motors: Monitors for developing faults such as bearing wear, looseness, or electrical issues that manifest as increased casing vibration.
Rolling Element Bearing Machines: Provides effective monitoring for equipment where shaft access is impossible, relying on casing-mounted sensors to capture vibration energy from bearing defects.
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