Introduction

Reliable machinery protection depends on more than monitoring electronics alone. Mechanical mounting components also play an important role in maintaining the intended position of proximity probes used to monitor rotating equipment.

The Bently Nevada 21000-00-00-00-078-04-02 Proximity Probe Housing Assembly (3300 XL) is a component to consider when maintaining compatible machinery monitoring installations. It is relevant to engineers and maintenance teams working with proximity measurement equipment in industrial environments where equipment condition and operating reliability are important.

In turbine, compressor, pump, and other rotating machinery applications, proximity measurement systems can provide information about shaft movement and machine condition. Correctly specified housing hardware helps support the physical installation required for these measurements.

For industrial procurement teams, the complete part number is essential when sourcing replacement components. Before purchasing, verify the mounting configuration, probe compatibility, and environmental requirements of the target installation. Accurate identification helps simplify maintenance planning and supports the continued operation of established monitoring systems.

Technical Specifications

Parameter	Specification
Brand	Bently Nevada
Model	21000-00-00-00-078-04-02
Product Type	Proximity Probe Housing Assembly
Associated Product Family	3300 XL
Housing Body Diameter	83.3 mm
Housing Body Diameter (inches)	3.28 in
Weight	1.10 kg / 2.43 lb
Application	Proximity probe mounting and machinery monitoring installations
System Compatibility	Verify against the installed probe and mounting configuration

Note: Confirm the mounting dimensions, material specifications, thread configuration, and compatible probe models against the technical documentation for the exact part number.

Recommended Related Models

The following Bently Nevada products may be relevant when reviewing proximity measurement hardware and compatible machinery monitoring installations. They serve different functions and should not be treated as direct replacements for the housing assembly.

Bently Nevada 330101 — 3300 XL 8 mm proximity probe model for consideration when checking compatible probe hardware.
Bently Nevada 330103 — Another 3300 XL 8 mm proximity probe designation to evaluate against the installation requirements.
Bently Nevada 330180 — 3300 XL extension cable product family component used in compatible proximity measurement systems.
Bently Nevada 3300 XL Proximitor Sensor — Signal-conditioning equipment used with compatible proximity probe systems.

Verify exact model suffixes, cable lengths, electrical compatibility, and mechanical requirements before selecting associated equipment.

Popular Related Models

For broader machinery condition monitoring and protection requirements, the following products may also be worth reviewing:

Bently Nevada 3300 XL 8 mm Proximity Probe — A sensing component used for non-contact shaft displacement and vibration measurements in compatible systems.
Bently Nevada 3300 XL Extension Cable — Connects compatible proximity probes to the associated signal-conditioning equipment.
Bently Nevada 3300 XL Proximitor Sensor — Converts the proximity probe signal into an output suitable for compatible monitoring equipment.
Bently Nevada 3500 Machinery Protection System — A machinery monitoring and protection platform used in industrial rotating equipment applications.

These products support different functions within a machinery monitoring installation. Confirm the exact model, electrical interface, mechanical mounting requirements, and system compatibility before ordering.

Applications

The Bently Nevada 21000-00-00-00-078-04-02 Proximity Probe Housing Assembly is designed for use in machinery monitoring installations associated with the Bently Nevada 3300 XL proximity measurement system. Housing assemblies are important in industrial environments where probe installation, mechanical protection, and stable positioning contribute to reliable vibration and shaft displacement monitoring.

Rotating Machinery Monitoring: Used in proximity probe installations associated with monitoring shaft movement and machine vibration.
Turbine Monitoring Systems: Relevant to compatible monitoring arrangements for steam turbines, gas turbines, and other rotating equipment.
Industrial Compressor Protection: Suitable for evaluating in compressor monitoring installations where proximity probe positioning is required.
Pump and Motor Condition Monitoring: Supports probe installation requirements in compatible machinery monitoring configurations.
Industrial Maintenance and Overhaul: Useful for maintenance teams replacing or servicing existing probe housing assemblies.
Critical Machinery Instrumentation: Relevant to industrial facilities that use proximity measurement systems as part of machinery condition monitoring and protection.

Correct application depends on the installed probe system, mounting arrangement, environmental conditions, and the specific requirements of the machinery being monitored.

Advantages

Designed for Machinery Monitoring Installations

The housing assembly is intended for proximity probe installation applications, helping support the physical arrangement required for machinery measurement systems.

Supports Consistent Probe Positioning

Properly selected and installed housing hardware helps maintain the intended probe mounting position, which is important for reliable measurement of shaft movement and vibration.

Suitable for Industrial Maintenance

The complete product designation, 21000-00-00-00-078-04-02, helps engineers and procurement teams identify the required component when planning equipment maintenance or replacement.

Integration with Existing Monitoring Infrastructure

For facilities operating compatible Bently Nevada 3300 XL equipment, identifying the correct housing assembly can help preserve the existing installation arrangement.

Practical Spare Parts Management

A clearly specified part number simplifies inventory identification, purchasing inquiries, and coordination between maintenance personnel and industrial suppliers.

Supports Equipment Reliability Programs

When correctly matched to the installed probe and mounting configuration, suitable housing hardware contributes to a properly installed machinery monitoring system.

Technical FAQs

Q1: What is the function of the Bently Nevada 21000-00-00-00-078-04-02 assembly?

It is identified as a proximity probe housing assembly associated with the 3300 XL product family. Its purpose is related to the mechanical housing and installation arrangement for a compatible proximity probe system.

Q2: What is a proximity probe used for in industrial machinery?

A proximity probe measures the relative distance between its sensing tip and a conductive target, commonly a rotating shaft. Depending on the monitoring configuration, the measurement can be used to assess shaft displacement, vibration, or axial position.

Q3: Is this housing assembly compatible with every 3300 XL probe?

Compatibility should not be assumed for every probe in the 3300 XL family. Confirm the exact probe model, mounting arrangement, thread requirements, and housing configuration before installation.

Q4: Does the housing assembly itself measure vibration?

No. The housing is a mechanical component. Actual measurement depends on the compatible proximity probe, associated extension cable where required, monitoring electronics, and the complete installed system.

Q5: Can this assembly be used for shaft displacement monitoring?

It may be used in an appropriate proximity measurement installation, provided the housing is compatible with the probe and the intended shaft measurement arrangement. The assembly alone does not determine measurement capability.

Q6: What should be checked before replacing an existing housing assembly?

Verify the full part number, mounting dimensions, thread configuration, probe compatibility, cable routing, and installation requirements. Check the equipment documentation before removing or replacing hardware.

Q7: Does the housing affect proximity probe measurement accuracy?

The housing does not independently establish measurement accuracy, but incorrect mounting, mechanical instability, or unsuitable probe positioning can affect the quality and consistency of the overall measurement installation.

Q8: Can this assembly be installed in high-vibration environments?

Its suitability depends on the specified mounting arrangement, mechanical design, operating environment, and installation instructions. Ensure the assembly is appropriate for the vibration and environmental conditions at the measurement point.

Q9: What maintenance is recommended for a proximity probe housing?

Inspect the housing and mounting hardware for looseness, corrosion, physical damage, contamination, and cable-routing problems. Follow the applicable site maintenance procedures and manufacturer guidance.

Q10: What information is required when ordering a replacement?

Provide the complete part number, 21000-00-00-00-078-04-02, and confirm the existing probe model, mounting configuration, and equipment application. This helps reduce the risk of receiving an incompatible assembly.

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