Introduction
The Bently Nevada 21000-16-05-00-103-03-02 is a 21000 Series proximity probe housing assembly configured around a 3300 XL 8 mm proximity probe. It is designed to provide a secure, well-defined mechanical installation for proximity measurement on critical rotating equipment.
What makes this configuration especially useful is its 10.3-inch probe penetration combined with a 0.5 m cable and a dedicated fitting arrangement. This extended configuration is suited to machinery where the sensing location is significantly recessed from the external mounting point. The assembly also includes a 3/4-14 NPT plug, a 3/4-14 to 1/2-14 NPT reducer, and a cable seal grip with interchangeable grommets for several cable diameters.
For turbine, compressor, generator, and other rotating-machinery installations, maintaining the probe at the correct mechanical position is essential. The 21000-16-05-00-103-03-02 provides a complete housing arrangement that helps simplify this aspect of installation while supporting a clean and maintainable monitoring setup.
Technical Specifications
The part number identifies a specific combination of probe, cable, penetration, fittings, and mounting configuration. In this model, 16 denotes the 3300 XL 8 mm probe, 05 specifies a 0.5 m cable, 00 indicates no standoff adapter, 103 represents a 10.3-inch penetration, 03 defines the fitting package, and 02 specifies the 3/4-14 NPT mounting thread.
| Specification | Details |
|---|
| Manufacturer | Bently Nevada |
| Part Number | 21000-16-05-00-103-03-02 |
| Product Series | 21000 Series |
| Product Type | Proximity Probe Housing Assembly |
| Compatible Probe | 3300 XL 8 mm |
| Probe Option | 16 – 3300 XL 8 mm probe with connector |
| Probe Cable Length | 0.5 m / 20 in |
| Standoff Adapter | None |
| Probe Penetration | 10.3 in |
| Fitting Option | 03 |
| Fittings Included | One 3/4-14 NPT plug; one 3/4-14 to 1/2-14 NPT reducer; one cable seal grip |
| Cable Seal Grommets | For cable sizes approximately 1/8–3/16 in, 1/4–5/16 in, and 5/16–3/8 in |
| Mounting Thread | 3/4-14 NPT |
| Housing Material | Aluminum body with 304 stainless-steel sleeve |
| Measurement Type | Non-contact shaft displacement / relative vibration |
| Typical Machinery | Turbines, compressors, generators, pumps and motors |
| Housing Diameter | Configuration-dependent; verify applicable installation drawing |
| Unit Weight | Exact net weight is configuration-dependent |
| Shipping Weight | Approximately 2 kg |
| Installation | Extended-penetration proximity probe housing |
Applications
Deep-Reach Turbine Monitoring
The extended 10.3-inch penetration makes this assembly particularly useful where the proximity probe must reach through a substantial section of the machine structure before reaching the shaft measurement point.
Compressor Shaft Measurement
Compressors require stable shaft monitoring to help identify changes in rotor behavior. A properly mounted 3300 XL 8 mm proximity probe can provide the non-contact measurement required by a compatible monitoring system.
Generator and Motor Protection
Large generators and motors may use proximity probes to observe relative shaft movement. The housing provides a defined mechanical path for positioning the sensor while protecting the installation from unwanted movement.
Bearing and Machine Casing Installations
Where the measurement location is recessed within a bearing housing or machine casing, the 10.3-inch penetration provides useful installation reach without relying on improvised mechanical extensions.
Retrofit Projects
The complete configuration can be advantageous when replacing an existing 21000 Series assembly. Matching the original penetration and fitting arrangement can reduce field modifications and help preserve the established monitoring geometry.
Condition Monitoring Systems
The assembly can form part of a larger machinery condition-monitoring chain consisting of the proximity probe, appropriate driver electronics, signal cabling, and monitoring equipment.
Advantages
10.3-Inch Extended Penetration
The most notable feature of this model is its 10.3-inch probe penetration. This makes it particularly valuable for installations where the probe must reach a deeply recessed sensing position.
Complete Fitting Arrangement
Unlike a basic housing configuration, this model includes a defined fitting package with a 3/4-14 NPT plug, reducer, and cable seal grip. This can simplify installation planning and provide greater flexibility for cable routing.
3300 XL 8 mm Platform
The housing is configured for the widely used 3300 XL 8 mm proximity probe, making it a practical choice for machinery already designed around this sensing platform.
No Standoff Adapter
The absence of a standoff adapter creates a straightforward configuration for applications where the 10.3-inch housing penetration itself provides the required reach.
Robust Industrial Construction
The aluminum housing body and 304 stainless-steel sleeve provide a durable mechanical structure suitable for demanding machinery-monitoring environments.
Flexible Cable Sealing
The included cable seal grip and multiple grommet sizes allow the assembly to accommodate several cable diameters, helping maintenance teams establish a cleaner and more secure cable-entry arrangement.
Maintenance-Friendly Design
A complete housing assembly can simplify replacement work by reducing the need to source and assemble multiple mechanical components separately.
Designed for Critical Rotating Equipment
When correctly integrated with compatible monitoring electronics, the assembly supports applications where reliable shaft-position and vibration information is an important part of machinery protection.
Technical FAQs
1. What is the Bently Nevada 21000-16-05-00-103-03-02?
It is a Bently Nevada 21000 Series proximity probe housing assembly configured for a 3300 XL 8 mm proximity probe. It provides the mechanical housing and mounting arrangement required for extended-reach proximity monitoring installations.
2. Which probe is used with this housing?
The assembly is configured for a 3300 XL 8 mm proximity probe. The “16” portion of the part number identifies the probe option.
3. How long is the probe cable?
The assembly uses a 0.5 meter (20-inch) probe cable. This is represented by the “05” section of the ordering code.
4. What does the “103” option mean?
The “103” option specifies a 10.3-inch probe penetration. This is the primary mechanical feature distinguishing this configuration from shorter penetration versions in the 21000 Series.
5. Does this model include a standoff adapter?
No. The “00” section specifies no standoff adapter. The required probe reach is provided through the housing's 10.3-inch penetration.
6. What fittings are included?
The “03” fitting option includes one 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, and one cable seal grip. The seal grip is supplied with grommet options for several cable diameters.
7. What mounting thread does the assembly use?
The housing uses a 3/4-14 NPT mounting thread. This should be checked against the machine-side mounting arrangement before installation.
8. What is the housing made from?
The 21000 configuration uses an aluminum housing body with a 304 stainless-steel sleeve. This construction provides mechanical support while offering useful resistance to industrial environmental conditions.
9. What are the dimensions and weight of this assembly?
The defining dimensional specification is the 10.3-inch probe penetration. Public product listings report a shipping weight of approximately 2 kg. A definitive net weight and complete dimensional envelope should be confirmed against the applicable engineering drawing rather than inferred from similar 21000 Series models.
10. Is this model a replacement for an older Bently Nevada configuration?
Yes. Available product listings identify 21000-16-05-00-103-03-02 as a replacement for 21000-28-05-00-103-03-02. When performing a replacement, the complete installation requirements and applicable approvals should still be verified before ordering.
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