Introduction
The part number 3500/33-01-00 149992-01 refers to a specific configuration of the Bently Nevada 3500/33 Proximitor® Seismic Monitor. This module is a versatile, 4-channel monitoring card designed for a mixed set of transducer types within a single slot of the 3500 rack system. It can condition and monitor signals from both eddy current proximity probes (for shaft relative vibration and position) and seismic transducers (for casing vibration, typically velocity). The module provides continuous monitoring, dynamic waveform output, and generates Alert and Danger alarms to protect a wide range of machinery.
Technical Parameters
The following table outlines the key technical specifications for the 3500/33-01-00 149992-01 module.
| Parameter Category | Specification |
|---|---|
| Part Number | 3500/33-01-00 149992-01 |
| 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, configurable per channel as: • Proximitor® Input: For eddy current probes (-8 VDC, 200 mA max) • Seismic Input: For velocity transmitters (4-20 mA) or accelerometers |
| Measurable Parameters | Shard Relative Vibration, Shaft Absolute Vibration, Casing Vibration, RPM (Keyphasor), Position (Thrust, Eccentricity) |
| Dynamic Output | Yes (for connection to diagnostic data acquisition systems) |
| 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 "149992-01" is likely a factory-specific order code or hardware revision. The core functionality is defined by the "3500/33-01-00" base number. Always consult the official configuration and manual for the specific module.*
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 seismic transducers. This provides a complete picture of the machine's dynamic behavior.
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.
Pumps and Motors:
An ideal cost-effective solution for pumps 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 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.
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 seismic sensors.
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