Introduction
The 3500/33-01-00 is a 4-Channel Proximitor® Seismic Monitor within the Bently Nevada 3500 Machinery Protection System. This module is a versatile and key component designed to condition and monitor signals from a mixed set of transducers within a single slot. It can interface with both eddy current proximity probes (for measuring shaft relative vibration and position) and seismic transducers (for measuring casing vibration, typically via 4-20 mA velocity transmitters). By consolidating these functions, it provides a flexible and cost-effective solution for comprehensive machinery monitoring, offering continuous protection, dynamic signal outputs for diagnostics, and configurable Alert and Danger alarms.
Technical Parameters
The following table outlines the key technical specifications for the 3500/33-01-00 monitor.
| Parameter Category | Specification |
|---|---|
| Part Number | 3500/33-01-00 |
| Description | 4-Channel Proximitor® Seismic Monitor |
| Physical Dimensions (H x W x D) | Approximately 128 mm x 40 mm x 200 mm (5.04 in x 1.57 in x 7.87 in) *Standard single-slot module for a 3500 rack.* |
| Weight | Approximately 0.6 kg (1.3 lbs) |
| Input Channels | 4 independent channels, individually configurable per channel as: • Proximitor® Input: Powers and conditions eddy current probes (-8 VDC to -24 VDC). • Seismic Input: Accepts 4-20 mA signals from velocity transmitters or accelerometers. |
| Measurable Parameters | Shaft Relative Vibration, Shaft Absolute Vibration, Casing Vibration, RPM (Keyphasor), Position (Thrust, Eccentricity). |
| Dynamic Output | Yes (per channel), for connection to diagnostic data acquisition systems for waveform and spectrum analysis. |
| Alarm Outputs | Two user-configurable setpoints per channel (Alert and Danger) with dedicated relay outputs on the 3500 rack backplane. |
| Power Supply | Powered by the 3500 rack via the backplane (from the 3500/53 Power Supply). |
| LED Indicators | Per channel: OK, Alert, Danger, and Bypass. |
| Operating Temperature | 0°C to 65°C (32°F to 149°F) |
*Note: The specifications provided are representative of this module family. The "-01-00" suffix indicates a specific hardware and firmware version. Always consult the official Bently Nevada 3500/33 documentation for precise configuration and wiring details.*
Application Scenarios
The 3500/33 module's flexibility makes it suitable for monitoring a wide array of machines where both shaft and casing vibration data are valuable for protection and diagnosis.
Steam and Gas Turbines:
Used to monitor shaft relative vibration via proximity probes on the bearings and casing vibration via 4-20 mA seismic transducers. This provides a complete picture of the machine's dynamic behavior from both relative and absolute perspectives.
Centrifugal Compressors:
Monitors radial shaft vibration with proximity probes on several bearings and uses a 4-20 mA seismic input to monitor the vibration of a gearbox or auxiliary drive attached to the compressor, all within one module.
Pumps and Motors:
An ideal cost-effective solution for critical pumps and motors where both shaft relative position (e.g., for sleeve bearings) and overall casing vibration (for rolling element bearings) need to be monitored on a single, unified module.
Fans and Blowers:
Can be configured to monitor the casing vibration of large induced draft fans using 4-20 mA velocity transmitters, providing alarm and trip signals to the control system while saving rack space.
Hydroelectric Units:
Used to monitor slow-speed shaft runout with proximity probes and the structural vibration of the generator stator or turbine bearing housings with 4-20 mA seismic sensors.
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