Introduction
The model 330780-52-00 is a 3300 XL Proximitor® Sensor from Baker Hughes Bently Nevada. This module is a critical signal conditioner and demodulator specifically designed for use with eddy current proximity probes (typically 5 mm or 8 mm). It provides the radio frequency (RF) power to the probe, demodulates the returning signal, and converts the changing gap between the probe tip and the machine shaft into a precise DC voltage proportional to vibration or position. The -52-00 suffix indicates a specific hardware configuration, often related to the connector type and internal calibration, making it a direct replacement or compatible unit for various machinery protection systems.
Parameters / Specifications
The following table outlines the key technical parameters for the 330780-52-00 module.
| Parameter | Specification |
|---|---|
| Model Number | 330780-52-00 |
| Description | 3300 XL Proximitor® Sensor (Signal Conditioner) |
| Physical Dimensions | Approx. 110 mm x 45 mm x 30 mm (4.3 in x 1.8 in x 1.2 in). |
| Weight | Approx. 0.3 kg (0.66 lb) |
| Function | Signal Conditioner / Demodulator for Eddy Current Probes |
| Compatible Probe Diameters | 5 mm and 8 mm Proximity Probes (System dependent) |
| Input Power Supply | -17 to -26 VDC |
| Output Signal | -1 to -17 VDC (scaled for a 2 mm measurement range) |
| Sensitivity | -8.00 V/mm (± 5%) / -200 mV/mil (± 5%) |
| Frequency Response | 0 to 10,000 Hz (0 to 600,000 CPM) |
| Electrical Connection | Standard military-style (MS) connectors, as defined by the -52-00 suffix. |
| Operating Temperature | -40°C to +85°C (-40°F to +185°F) |
| Mounting | Designed for direct mounting or DIN rail mounting. |
Note: The exact specifications, particularly the connector type and any calibration details, are defined by the -52-00 suffix. This module is typically part of a larger transducer system (e.g., 3300 XL 8mm System). Always confirm compatibility with the existing probe and cable system.
Application Scenarios
The 330780-52-00 Proximitor is a fundamental component in machinery protection systems, enabling the accurate measurement of shaft dynamics.
Shaft Vibration Monitoring:
Used as the signal conditioning unit for proximity probes measuring radial shaft vibration on critical equipment like turbines, compressors, and large pumps. The output is fed to a monitoring system for alarm and shutdown functions.
Axial Position Monitoring:
Conditions the signal from a proximity probe measuring the thrust position of a rotor, providing vital data to prevent catastrophic thrust bearing failure.
Keyphasor® Signal Generation:
Used to condition the signal from a proximity probe to generate a once-per-revolution Keyphasor pulse, which is essential for determining phase reference in vibration analysis and for speed measurement.
Radial Position Monitoring:
Provides the DC gap voltage used to determine the average shaft position within a bearing (radial position), important for understanding a machine's centerline and alignment.
Replacement and Retrofit:
Commonly used as a direct replacement for older or faulty Proximitor modules in existing Bently Nevada 3300 XL and other compatible systems, ensuring continued machinery protection with updated hardware.
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