Product Overview

The Bently Nevada 330881-16-05-035-01-02 is a highly integrated PROXPAC XL proximity transducer system engineered for industrial machine condition monitoring. By consolidating the functionality of a traditional proximity probe and an external Proximitor sensor into a single, robust housing, this device simplifies the installation process for critical turbomachinery applications. It utilizes advanced eddy-current technology to detect shaft displacement, rotor vibration, and axial position, providing high-fidelity data to monitoring systems without the requirement for intermediate coaxial cabling.

Designed to operate in harsh industrial environments, the 330881-16-05-035-01-02 is a mission-critical component in Turbine Supervisory Instrumentation (TSI) setups. Its integrated design reduces potential points of failure, such as connector degradation or cable damage, which are common in distributed sensor architectures. This transducer ensures that the critical -10 VDC gap voltage target is easily achieved and maintained, providing a linear electrical output directly proportional to the distance between the probe tip and the observed shaft. For maintenance and engineering teams, this unit offers a compact, efficient solution for monitoring high-speed assets where space is constrained and reliability is the top priority.

Technical Specifications

Model Configuration Explanation

The model string breakdown for the 330881-16-05-035-01-02 is as follows:

• 330881: Designates the PROXPAC XL integrated proximity transducer series.

• 16: Specifies the probe diameter and thread configuration.

• 05: Denotes the unthreaded length requirement.

• 035: Represents the total case length in millimeters (35 mm).

• 01: Indicates the specific connector type integrated into the housing.

• 02: Defines the agency approval and calibration standards applied to this unit.

Typical Applications

The PROXPAC XL series is widely utilized in sectors where high-precision vibration data is required:

• Steam and Gas Turbines: Monitoring shaft radial vibration and bearing performance.

• Large Industrial Pumps: Detecting mechanical misalignment and impeller wear.

• Centrifugal Compressors: Managing axial thrust position to protect critical thrust bearings.

• Large Electric Motors: Ensuring rotor stability and monitoring dynamic air-gap characteristics.

• Hydroelectric Power Plants: Providing consistent displacement data in humid, demanding environments.

System Compatibility

The 330881-16-05-035-01-02 is a self-contained unit but functions as part of a wider monitoring ecosystem:

• Monitoring Racks: Compatible with standard 3500 series vibration monitoring systems and earlier Bently Nevada rack designs.

• Power Supplies: Designed for standard -24 VDC industrial power rails.

• Data Acquisition: Interfaces directly with standard vibration input cards, provided the input impedance and power requirements are satisfied.

• Mounting Hardware: Compatible with standard Bently Nevada mounting brackets and conduit assemblies for secure machine integration.

Installation Protocols

Achieving optimal sensor performance requires strict adherence to installation best practices:

• Positioning: Ensure the transducer is mounted perpendicular to the shaft centerline to prevent measurement bias.

• Gap Setting: Utilize a depth micrometer to achieve the nominal gap. Connect the transducer to a digital voltmeter and adjust the housing until the -10 VDC output setpoint is reached.

• Grounding: Secure the stainless steel housing to the machine chassis to ensure a solid electrical ground, which is vital for effective RFI/EMI shielding.

• Cabling: Ensure the cable run is protected by industrial conduit; avoid tight bend radii that can stress the integrated cable-to-housing interface.

• Torque Management: Use appropriate jam nuts and locking washers to prevent transducer migration during continuous machine operation.

Product Advantages

• Integrated Architecture: Eliminates external Proximitor housings and extension cables, simplifying installation and reducing spare parts inventory.

• Reliability: The factory-sealed construction protects internal signal conditioning electronics from oil, moisture, and dust ingress.

• Signal Precision: Minimized signal path length reduces potential noise and interference, leading to cleaner data for diagnostics.

• Compact Design: Ideal for machinery with limited space between the bearing housing and the shaft.

• Simplified Commissioning: Direct electrical output reduces the troubleshooting time typically associated with separate probe/cable/sensor systems.

Ordering Information

The 330881-16-05-035-01-02 package includes:

• One (1) PROXPAC XL integrated proximity transducer.

• Necessary installation hardware (nuts and lock washers).

• Technical configuration and calibration documentation.

• Note: Verify the mounting thread compatibility with your machine's existing port before ordering to avoid fitment issues.

Frequently Asked Questions

• Is the PROXPAC XL field-repairable if the probe tip is damaged?

  No. The unit is a factory-sealed, integrated assembly. Structural damage to the tip or body requires the complete unit to be replaced.

• Can this transducer be used without a -24 VDC power supply?

  No. The integrated signal conditioning electronics require a stable -24 VDC source to function within the linear range.

• How does the 35 mm case length affect installation?

  The 35 mm case length determines the reach of the probe into the machine casing. Ensure this matches your port depth to maintain the correct gap.

• Does the transducer require a specific shaft target material?

  Calibration is based on 4140 steel. If the target material is different, a scale factor adjustment will be necessary for accurate readings.

• What is the role of the -10 VDC gap voltage target?

  The -10 VDC setpoint ensures the transducer is operating in the center of its linear range, providing a full swing for accurate vibration monitoring.

• How can I verify the transducer is healthy?

  Monitor the DC gap voltage at the input card terminal. A steady voltage within the expected range indicates proper operation.

• Can I use this in an oil-submerged environment?

  Yes, the 330881 is designed to be oil-resistant, provided the cable-to-housing interface is sealed correctly during installation.

• Does the PROXPAC XL generate the same signal as a separate Proximitor system?

  Yes, the electrical output is designed to be directly compatible with monitoring systems configured for standard Bently Nevada 8 mm proximity probes.