Description

BENTLY 3300/20-12-01-03-00-00: Dual Channel Proximitor Power Supply for 3300 XL System

Product Description

The BENTLY 3300/20-12-01-03-00-00 is a critical dual-channel power supply, commonly known as a Proximitor Power Supply, for the Bently Nevada 3300 XL machinery monitoring system. This module serves as the dedicated power source and signal conditioner for two eddy current proximity probes, which are used to measure shaft radial vibration, axial position (thrust), speed, and phase. The BENTLY 3300/20-12-01-03-00-00 provides the required -24V DC excitation to the probes and conditions the returning radio frequency (RF) signal, converting the gap between the probe tip and the shaft into a precise DC voltage proportional to distance. Its reliable operation is fundamental to obtaining accurate and stable vibration and position measurements for machinery protection.

Product Parameters

• Product Type: Dual-Channel Proximitor Power Supply / Signal Conditioner
• Manufacturer: Bently Nevada (Baker Hughes)
• Part Number: 3300/20-12-01-03-00-00
• Compatible System: 3300 XL Series Rack
• Number of Channels: 2 independent channels.
• Input Power: Typically +24V DC from the 3300 rack.
• Output to Probe: Supplies -24V DC (regulated) to each eddy current proximity probe.
• Output to Monitor: Provides a conditioned DC voltage ( Gap Voltage, typically -2 to -18V DC) proportional to the probe-to-shaft gap, as well as a raw AC vibration signal.
• Probe Compatibility: Designed for use with standard 5 mm or 8 mm eddy current probes and associated extension cables.
• LED Indicators: Includes power OK and fault indicators per channel.

Advantages and Features

The primary advantage of the BENTLY 3300/20-12-01-03-00-00 is its dedicated, high-performance design for powering and conditioning eddy current probes, which are the gold standard for non-contact shaft measurement. It provides excellent signal stability and noise immunity, which is crucial for detecting small vibration changes. Each channel is electrically isolated to prevent crosstalk. The module includes diagnostics to detect common field wiring problems such as open cables, shorted cables, or improper probe installation. The rugged design of the BENTLY 3300/20-12-01-03-00-00 ensures reliable performance in the high-vibration, high-electrical-noise environment typical of turbine and compressor installations.

Application Cases in Various Fields

This module is used wherever critical rotating machinery is monitored with proximity probes. In Steam and Gas Turbines for power generation, the BENTLY 3300/20-12-01-03-00-00 powers probes measuring shaft vibration and eccentricity. Within Centrifugal and Reciprocating Compressors in oil & gas and chemical plants, it supplies probes for radial vibration and axial position (thrust bearing) monitoring. For Large Pumps and Motors, it enables condition monitoring to detect imbalance or misalignment. It is also essential in Hydro Turbines, Paper Machine Rolls, and Marine Propulsion gearboxes.

Comparisons with Competing Products

Competing products include probe power supplies from other monitoring system vendors like SKF or Emerson (CSI). The BENTLY 3300/20-12-01-03-00-00 is part of the ubiquitous 3300 XL system, which is the industry benchmark for continuous online protection. Compared to generic DC power supplies, this module is specifically engineered for the unique electrical requirements of eddy current probes, providing the correct voltage, filtering, and diagnostics. Its value lies in its guaranteed compatibility, performance, and reliability within the total Bently Nevada monitoring and protection solution.

Selection Suggestions and Precautions

1. Probe and Extension Cable Matching: The BENTLY 3300/20-12-01-03-00-00 must be used with the correct probe model (sensitivity, e.g., 200 mV/mil) and a properly matched extension cable. Mismatched components will result in an incorrect scale factor (µm/V or mils/V) and faulty readings.
2. Gap Setting and Calibration: After installation, the probe must be set to its correct gap (typically specified by the machinery OEM). The corresponding DC gap voltage at the BENTLY 3300/20-12-01-03-00-00 output must be verified and calibrated in the system software to ensure accurate displacement measurement.
3. Cable Routing and Protection: Probe extension cables are sensitive. Route them away from high-power cables in separate conduits or trays to prevent electrical noise induction. Ensure cables are not damaged during installation.
4. Power Supply Redundancy: For critical machinery, the rack’s main power supply feeding the BENTLY 3300/20-12-01-03-00-00 should be redundant. Loss of power to this module means loss of protection for that channel.
5. Diagnostic Utilization: Monitor the module’s OK and fault LEDs. Integrate the module’s fault relay outputs (if available) or system diagnostics into the plant DCS/PLC for alarm generation. A fault on the BENTLY 3300/20-12-01-03-00-00 means the associated vibration/position signal is invalid, which may require placing the machinery in a safe state or relying on other protective channels.

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