Introduction
The Bently Nevada 21000-16-05-00-070-04-02 is a 21000 Series proximity probe housing assembly configured for a 3300 XL 8 mm proximity probe. Designed for industrial rotating machinery, this assembly provides the mechanical support needed to position and protect the probe at a defined measurement location.
Its configuration includes a 0.5 m probe cable, no standoff adapter, 7.0-inch probe penetration, one 3/4-14 NPT plug, and a 3/4-14 NPT mounting interface. The extended penetration makes this version particularly useful for machinery where the sensing point is located deeper inside the machine casing or bearing housing.
For maintenance engineers and plant operators, a correctly configured probe housing can be just as important as the sensor itself. Stable positioning, appropriate penetration, and secure mounting help establish the physical conditions required for consistent proximity measurements.
Technical Specifications
The 21000 Series uses a structured ordering system in which individual sections identify the probe type, cable length, standoff configuration, penetration length, fittings, and mounting arrangement. For 21000-16-05-00-070-04-02, the configuration is centered on a 3300 XL 8 mm probe with a 7-inch penetration.
| Specification | Details |
|---|
| Manufacturer | Bently Nevada |
| Part Number | 21000-16-05-00-070-04-02 |
| Product Type | Proximity Probe Housing Assembly |
| Housing Series | 21000 Series |
| Compatible Probe | 3300 XL 8 mm |
| Probe Option | 16 – 3300 XL 8 mm probe |
| Probe Cable Length | 0.5 m / 20 in |
| Standoff Adapter | None |
| Probe Penetration | 7.0 in |
| Fittings | One 3/4-14 NPT plug |
| Mounting Thread | 3/4-14 NPT |
| Housing Body | Aluminum |
| Sleeve | 304 stainless steel |
| Housing Body Diameter | Approximately 83.3 mm |
| Measurement Application | Shaft displacement and relative vibration |
| Typical Machinery | Turbines, compressors, generators, pumps and motors |
| Overall Installation Dimensions | Configuration-dependent; verify the applicable mechanical drawing |
| Unit Weight | Approximately 1.1 kg / 2.4 lb |
| Shipping Weight | Approximately 2 kg, depending on packaging and accessories |
Applications
Turbine Rotor Monitoring
The 21000-16-05-00-070-04-02 can be used to establish a protected mounting position for a 3300 XL 8 mm proximity probe on turbine machinery. The extended penetration is useful where the probe must reach through a machine casing toward the shaft.
Compressor Machinery
Compressors often require continuous monitoring of shaft movement and vibration. A properly installed proximity probe housing provides the mechanical stability needed to maintain the probe at its intended sensing position.
Generator and Motor Monitoring
Large generators and motors can use proximity measurements to monitor relative shaft movement. The housing assembly provides a defined mechanical interface for installations where probe alignment must remain stable during continuous operation.
Bearing Housing Installations
The 7-inch penetration configuration is particularly useful for applications in which the sensing point is recessed from the external mounting location. It provides additional reach without requiring the maintenance team to create an improvised extension arrangement.
Pump and Auxiliary Equipment
The assembly can also be used on suitable pumps and other rotating equipment where a 3300 XL 8 mm proximity measurement system is required.
Equipment Retrofit and Replacement
For machines already using a 21000 Series housing, a matching configuration can make replacement work more straightforward. Maintaining the original mounting and penetration arrangement can reduce field modification and shorten maintenance activities.
Advantages
Extended Probe Reach
The 7.0-inch penetration is the defining mechanical feature of this configuration. It gives engineers additional reach when the probe measurement point is positioned deeper within the machine structure.
3300 XL 8 mm Compatibility
The housing is configured around the established 3300 XL 8 mm proximity probe platform, making it suitable for machinery-monitoring systems built around this sensing technology.
Stable Mechanical Positioning
A dedicated housing provides a more controlled installation than an unsupported or improvised probe arrangement. Maintaining a consistent probe position is essential for repeatable proximity measurements.
Robust Material Selection
The aluminum housing body and stainless-steel sleeve provide a practical construction for industrial service, combining structural support with resistance to the conditions commonly encountered around rotating machinery.
Defined 3/4-14 NPT Interface
The standard NPT mounting connection makes the mechanical configuration easy to identify during procurement and replacement planning.
Compact Cable Configuration
The integrated 0.5 m cable provides a clearly defined probe connection arrangement for installations where the required cable run is relatively short.
Maintenance Efficiency
A complete housing assembly can reduce the amount of individual mechanical component work required during replacement. This can be especially valuable when minimizing equipment downtime is a priority.
Suitable for Critical Machinery
When incorporated into a compatible monitoring system, the assembly supports proximity measurement applications where reliable shaft-position and vibration information contributes to machinery protection and maintenance decisions.
Technical FAQs
1. What is the Bently Nevada 21000-16-05-00-070-04-02?
It is a 21000 Series Proximity Probe Housing Assembly configured for a Bently Nevada 3300 XL 8 mm proximity probe. It is intended for industrial rotating-machinery monitoring applications.
2. Which probe is used with this assembly?
The housing is configured for a 3300 XL 8 mm proximity probe. The “16” section of the ordering code identifies this probe configuration.
3. How long is the probe cable?
This model uses a 0.5 meter (20-inch) probe cable.
4. What is the probe penetration length?
The assembly provides a 7.0-inch probe penetration. This extended configuration is useful when the sensing location is relatively deep inside the machinery casing.
5. Does this model include a standoff adapter?
No. The “00” portion of the configuration indicates that no standoff adapter is included.
6. What mounting connection does the assembly use?
The housing uses a 3/4-14 NPT mounting thread. The machine-side connection should be checked carefully before installation to ensure mechanical compatibility.
7. What is the housing made from?
The 21000 Series housing configuration uses an aluminum body with a 304 stainless-steel sleeve. This combination provides a practical balance between mechanical strength, corrosion resistance, and overall assembly weight.
8. What are the dimensions and weight of the assembly?
The housing body diameter is approximately 83.3 mm, while the unit weight is approximately 1.1 kg (2.4 lb). The complete installation envelope depends on the selected configuration and should be verified against the applicable mechanical drawing.
9. Why would a 7-inch penetration be selected instead of a shorter version?
A longer penetration is useful when the probe must reach farther from the external mounting point to the actual shaft measurement location. Selecting the correct penetration helps avoid installation problems and ensures the probe can be positioned at the intended sensing point.
10. Can a different 21000 Series housing be used as a direct replacement?
Not automatically. Different 21000 Series assemblies can share the same 3300 XL 8 mm probe while having different cable lengths, penetration dimensions, standoff arrangements, fittings, or mounting configurations. The complete part number should be matched before replacement.
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