Introduction

The Bently Nevada 21000-28-05-00-035-01-02 Proximity Probe Housing Assembly is a mechanical component associated with 3300XL proximity probe installations. While the probe and monitoring electronics receive most of the attention in a machinery-protection system, the mechanical mounting arrangement is equally important for maintaining reliable measurements.

A proximity probe measures shaft movement by detecting changes in the distance between its sensing tip and the rotating target. Because the measurement depends on this distance, any unwanted movement of the probe itself can affect the signal. A rigid and correctly positioned housing therefore provides an essential mechanical foundation for the monitoring system.

The housing assembly is particularly relevant in turbines, compressors, pumps, motors, generators, and other rotating equipment where vibration monitoring is used to protect high-value machinery. In these applications, inaccurate probe mounting can create unnecessary alarms or, more seriously, mask genuine changes in shaft behavior.

For maintenance teams, the 21000-28-05-00-035-01-02 can serve as a replacement housing when the existing assembly has suffered mechanical damage, deformation, corrosion, or mounting deterioration. Before installation, the replacement should be compared with the existing mechanical arrangement and the compatible 3300XL probe.

Following replacement, technicians should verify probe alignment, mechanical tightness, sensing gap, cable routing, and monitoring-channel behavior. This ensures that the new housing supports the complete measurement chain rather than simply restoring the physical installation.

Technical Specifications

Parameter	Specification
Brand	Bently Nevada
Product Series	3300XL
Part Number	21000-28-05-00-035-01-02
Product Type	Proximity Probe Housing Assembly
Component Type	Mechanical Probe Housing
Primary Function	Proximity Probe Mounting and Support
Typical Application	Rotating Machinery Monitoring
Compatible System	3300XL Proximity Monitoring Applications
Housing Body Diameter	83.3 mm
Weight	1.10 kg (2.43 lb)

The housing body diameter is 83.3 mm, while the specified weight is 1.10 kg (2.43 lb).

Because the housing forms part of a precision measurement installation, dimensional compatibility should be verified before replacement. The mechanical interface, probe arrangement, installation location, and required sensing clearance all need to match the existing machinery-monitoring design.

Recommended Related Models

Model	Product Type	Typical Application
Bently Nevada 3300 XL 8 mm Proximity Probe	Proximity Probe	Shaft vibration and position monitoring
Bently Nevada 3300 XL Proximity Transducer System	Proximity Monitoring System	Rotating machinery protection
Bently Nevada 3300 XL Extension Cable	Extension Cable	Probe signal connection
Bently Nevada 3300 XL Proximitor Sensor	Proximitor Sensor	Proximity signal conditioning
Bently Nevada 3300 Monitoring System	Machinery Monitoring System	Machinery protection and condition monitoring

These components can form part of a complete proximity-monitoring installation. Compatibility should be confirmed according to the specific probe, transducer, extension cable, housing arrangement, and monitoring system.

Popular Related Models

Model	Product Type	Typical Use
Bently Nevada 3300 XL 8 mm Proximity Probe	Proximity Probe	Turbine and compressor monitoring
Bently Nevada 3300 XL Proximitor Sensor	Proximitor Sensor	Probe signal conditioning
Bently Nevada 3300 XL Extension Cable	Extension Cable	Proximity signal transmission
Bently Nevada 3300 Monitoring System	Machinery Monitoring System	Machinery protection
Bently Nevada 3300 XL Proximity Transducer System	Proximity Monitoring System	Shaft vibration and position measurement

For maintenance applications, the housing should be selected according to the exact mechanical arrangement rather than simply the probe series. Correct probe fit, housing geometry, shaft clearance, alignment, and mounting integrity are all essential for obtaining dependable proximity-monitoring results.

Applications

The Bently Nevada 21000-28-05-00-035-01-02 Proximity Probe Housing Assembly is a mechanical mounting component designed for compatible 3300XL proximity probe installations. Its primary purpose is to provide a stable and protected mounting arrangement for the proximity probe used in rotating machinery monitoring systems.

The housing assembly is suitable for applications where reliable probe positioning is essential for accurate shaft displacement and vibration measurement.

Typical applications include:

Steam turbine monitoring
Gas turbine machinery
Centrifugal compressors
Industrial pumps
Electric motors
Generators
Gearboxes
Rotating shafts
Machinery protection systems
Predictive maintenance installations

In critical rotating equipment, the physical installation of a proximity probe is just as important as the electronic sensing system. A secure housing helps maintain the intended probe position and protects the measurement assembly from mechanical movement and installation-related disturbances.

Advantages

The 21000-28-05-00-035-01-02 provides a dedicated mechanical interface for compatible 3300XL proximity probe installations. It is particularly useful when maintaining machinery-monitoring systems where accurate and repeatable probe positioning is required.

Stable Probe Mounting
A properly designed housing helps keep the proximity probe securely positioned relative to the monitored shaft, reducing the risk of unwanted movement during machine operation.

Supports Measurement Accuracy
Probe alignment and mechanical stability directly influence the quality of proximity measurements. A rigid housing helps maintain the intended sensing relationship between the probe and target.

Designed for Rotating Machinery
The assembly is suitable for machinery-monitoring environments where vibration, temperature, and mechanical forces can affect conventional mounting arrangements.

3300XL System Compatibility
The housing is intended for compatible 3300XL proximity probe installations, making it useful for maintenance and refurbishment of established machinery-monitoring systems.

Protection for the Probe Installation
A dedicated housing can provide a more controlled mechanical environment around the probe and its mounting position.

Practical Maintenance Replacement
Replacing a damaged or worn housing can restore proper probe positioning without unnecessarily replacing the entire proximity measurement system.

Technical FAQs

1. What is the Bently Nevada 21000-28-05-00-035-01-02 used for?
It is a Proximity Probe Housing Assembly designed to provide mechanical mounting and support for compatible 3300XL proximity probe installations.

2. Why is the probe housing important in a vibration-monitoring system?
The housing maintains the mechanical position of the probe relative to the shaft. If the probe moves independently of the machine structure, the monitoring system may interpret that movement as an actual change in shaft position.

3. Can the housing be used with any proximity probe?
No. Compatibility depends on the probe design, mounting arrangement, thread or mechanical interface, and the corresponding 3300XL installation requirements.

4. What can happen if the probe housing becomes loose?
A loose housing can cause relative movement between the probe and its mounting structure. This may introduce measurement errors, unstable signals, or false vibration indications.

5. How should the housing be inspected during maintenance?
Inspect the body for mechanical damage, deformation, corrosion, loose mounting hardware, contamination, and evidence of movement. The probe mounting arrangement should also be checked for correct positioning.

6. Can mechanical vibration damage a proximity probe housing?
Long-term exposure to excessive vibration can contribute to mechanical loosening, fatigue, or damage depending on the installation environment. Mounting integrity should therefore be included in routine machinery-monitoring inspections.

7. What should be checked when installing a replacement housing?
Verify the housing part number, mounting interface, probe compatibility, installation position, clearances, and mechanical condition. The probe should be positioned correctly after the housing has been installed.

8. Does the housing itself measure vibration?
No. The housing is a mechanical mounting component. The actual proximity measurement is performed by the compatible proximity probe and its associated transducer electronics.

9. Why is alignment important when installing the housing?
The probe must maintain the correct geometric relationship with the shaft target. Poor alignment can affect the measurement gap and may produce unreliable or misleading monitoring signals.

10. Should the monitoring system be checked after replacing the housing?
Yes. After mechanical replacement, the probe position and gap should be verified, followed by inspection of the transducer output and monitoring-channel baseline. A controlled machine test can then confirm stable operation.

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