Introduction
The Bently Nevada 21000-16-05-00-065-04-02 is a 21000 Series proximity probe housing assembly configured for a 3300 XL 8 mm proximity probe. It provides a mechanically secure environment for the probe while establishing the positioning and connection arrangement required for reliable shaft monitoring on industrial rotating equipment.
This configuration combines a 3300 XL 8 mm probe, a 0.5 meter cable, no standoff adapter, a 6.5-inch probe penetration, one 3/4-14 NPT plug, and a 3/4-14 NPT mounting interface. The resulting assembly is particularly useful when a proximity probe must be positioned at a defined distance within a machine casing or protective housing.
For machinery maintenance and retrofit work, the 21000 series offers a practical approach to protecting the sensing element while keeping probe access and mechanical positioning under control. It is a strong fit for applications where dependable shaft measurement and robust installation hardware are equally important.
Technical Specifications
The model number provides a useful breakdown of the configuration. The 16 identifies the 3300 XL 8 mm probe option, 05 specifies a 0.5 m cable, 00 indicates no standoff adapter, and 065 represents a 6.5-inch probe penetration. The 04 fitting option provides one 3/4-14 NPT plug, while 02 identifies the 3/4-14 NPT mounting thread.
| Specification | Details |
|---|
| Manufacturer | Bently Nevada |
| Part Number | 21000-16-05-00-065-04-02 |
| 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 | 6.5 in |
| Fittings Option | 04 – One 3/4-14 NPT plug |
| Mounting Thread | 3/4-14 NPT |
| Housing Body Material | Aluminum |
| Sleeve Material | 304 stainless steel |
| Housing Body Diameter | Approximately 83.3 mm |
| Typical Measurement | Shaft displacement / relative vibration |
| Typical Machinery | Turbines, compressors, pumps, motors and generators |
| Overall Length | Configuration-dependent; verify installation drawing |
| Unit Weight | Approximately 1.1 kg / 2.4 lb |
| Shipping Weight | Approximately 2 kg, depending on packaging |
| Installation Type | Industrial proximity-probe housing arrangement |
Applications
Turbine Shaft Monitoring
The 21000 housing can be used to position a 3300 XL 8 mm proximity probe for turbine shaft monitoring. The protected probe arrangement helps maintain a controlled sensing location while allowing the monitoring system to observe changes in rotor movement.
Compressor Monitoring
In compressors, shaft vibration and displacement measurements can play an important role in machinery protection. The 6.5-inch penetration configuration provides additional installation reach where the sensing location is positioned relatively deep inside the machine structure.
Generator and Motor Applications
Large motors and generators can use proximity measurements to monitor shaft behavior. A rigid housing arrangement helps keep the probe physically stable and properly aligned during continuous operation.
Pumps and Auxiliary Rotating Equipment
The assembly can also be considered for pumps and other rotating machinery where a protected 3300 XL proximity probe installation is required.
Retrofit Installations
When an existing machine has been designed around a 21000 Series housing, replacing the complete assembly with a matching configuration can simplify field maintenance and avoid unnecessary modifications to the mounting arrangement.
Long-Term Machinery Protection
The housing supports the physical installation of the proximity probe within a larger machinery-monitoring architecture. When paired with compatible monitoring electronics, it can contribute to continuous observation of shaft position and vibration.
Advantages
Purpose-Built Probe Protection
The housing provides mechanical support and protection for the proximity probe, helping shield the sensing assembly from the surrounding industrial environment while maintaining its intended position.
3300 XL 8 mm Compatibility
The configuration is specifically arranged around a 3300 XL 8 mm probe. This makes it suitable for installations already standardized around the 3300 XL proximity measurement platform.
Extended 6.5-Inch Penetration
The relatively long probe penetration provides useful installation flexibility for machinery where the sensing point is positioned deeper within the equipment casing.
Compact 0.5-Meter Cable Configuration
The 0.5 m cable option offers a defined connection length for installations where the monitoring electronics or cable termination point is located close to the housing.
Durable Material Combination
The aluminum housing body combined with a 304 stainless-steel sleeve provides a practical construction for industrial service while keeping the assembly lighter than an all-stainless housing.
Defined NPT Mounting Interface
The 3/4-14 NPT mounting thread provides a standardized threaded interface for appropriate industrial mounting arrangements.
Maintenance-Friendly Configuration
A clearly defined housing assembly makes it easier for maintenance teams to reproduce an existing installation configuration without having to separately specify every mechanical component.
Suitable for Critical Machinery
For rotating equipment where unexpected shaft movement can lead to costly downtime, a properly positioned and mechanically stable proximity probe can provide valuable measurement data for machinery protection.
Technical FAQs
1. What is the Bently Nevada 21000-16-05-00-065-04-02?
It is a Bently Nevada 21000 Series Proximity Probe Housing Assembly configured for a 3300 XL 8 mm proximity probe. The assembly is intended for industrial rotating-machinery monitoring applications.
2. Which proximity probe does this housing use?
The configuration is designed for a 3300 XL 8 mm proximity probe. The “16” in the ordering code identifies this probe option.
3. What is the cable length?
The model uses a 0.5 meter (20-inch) probe cable. The cable-length selection is represented by the “05” option in the part number.
4. Does this model have a standoff adapter?
No. The “00” configuration indicates no standoff adapter.
5. What is the probe penetration length?
The “065” option specifies a 6.5-inch probe penetration. This dimension should be checked carefully against the machine's physical installation requirements before replacement.
6. What type of mounting thread does the housing use?
The assembly uses a 3/4-14 NPT mounting thread. The mounting connection should be verified against the existing machine-side hardware before installation.
7. What material is the 21000 housing made from?
The housing configuration uses an aluminum body with a 304 stainless-steel sleeve. This construction is intended to provide a practical combination of mechanical durability and corrosion resistance.
8. What are the dimensions and weight of the assembly?
The housing body diameter is approximately 83.3 mm, and the listed unit weight is approximately 1.1 kg (2.4 lb). Shipping weight can be approximately 2 kg depending on packaging and accessories. The complete installation envelope should be verified against the applicable mechanical drawing.
9. Is the probe housing itself the vibration-monitoring device?
No. The housing is the mechanical assembly used to mount and protect the proximity probe. The actual measurement is performed by the compatible 3300 XL proximity probe and processed through the associated driver and monitoring equipment.
10. Can another 3300 XL 8 mm housing replace this model?
Not automatically. Different 21000 Series assemblies can have different cable lengths, standoff dimensions, penetration lengths, fittings, and mounting arrangements. Even when the same 3300 XL 8 mm probe is used, the complete configuration should be matched before selecting a replacement.
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