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- Explosion-Proof Housing Assembly
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Product Overview
The Bently Nevada CA21000-28-05-00-130-04-02 is an explosion-proof proximity probe housing assembly configured with a 3300 XL 8 mm proximity probe and a 0.5-meter integral probe cable. Its defining feature is the 13.0-inch probe penetration with no standoff adapter, making the mounting geometry particularly important when the assembly is installed on a machine casing or bearing housing.
On compressors, steam turbines, and other rotating equipment, a proximity probe measures the gap between its tip and a conductive shaft target. The CA21000 assembly provides the external mounting arrangement for this measurement point, combining the probe, sleeve, housing, and specified conduit fittings. The associated extension cable, Proximitor sensor, and monitoring channel complete the electrical measurement system.
The long probe penetration distinguishes this configuration from assemblies intended for shallower mounting positions. The probe must reach the intended sensing location while maintaining the required clearance from the shaft. Because the penetration exceeds 12 inches, additional sleeve support near the probe is required to reduce the risk of resonance in the unsupported sleeve.
The ordering code also defines the connection details. The 28 option specifies a 3300 XL 8 mm probe with multiple approvals, 05 specifies a 0.5-meter probe cable, 00 means no standoff adapter, 130 specifies 13.0 inches of probe penetration, 04 specifies one 3/4-14 NPT plug, and 02 specifies the 3/4-14 NPT mounting thread.
For replacement work, the full reference matters because changing the penetration, probe configuration, or fitting arrangement can affect both the mechanical installation and the suitability of the assembly for the existing hazardous-area installation.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Bently Nevada |
| Model | CA21000-28-05-00-130-04-02 |
| Product Family | 21000 Series |
| Product Type | Explosion-Proof Housing Assembly |
| Probe Type | 3300 XL 8 mm Proximity Probe |
| Probe Approval Configuration | Multiple approvals |
| Probe Cable Length | 0.5 meters |
| Standoff Adapter | None |
| Probe Penetration | 13.0 inches |
| Maximum C + D Dimension | 13.5 inches (34.3 cm) |
| Fitting Configuration | One 3/4-14 NPT plug only |
| Mounting Thread | 3/4-14 NPT |
| Housing Body Material | Aluminum |
| Probe Sleeve Material | 304 stainless steel |
| Housing Certification | CSA explosion-proof configuration for specified North American hazardous-area applications |
| Enclosure Rating | Type 4 |
| Temperature Classification | T5 at ambient temperatures from -50°C to +40°C; T4 from -50°C to +80°C |
| Cable Length | 0.5 meters |
| Weight | 1.1 kg |
Product Features
- 3300 XL 8 mm probe integration: Includes the specified proximity probe with multiple approvals as part of the assembly configuration.
- 13.0-inch probe penetration: Supports installations where the sensing point is located deeper within the machine mounting structure.
- Long stainless-steel sleeve: Uses a 304 stainless steel sleeve within the aluminum housing assembly.
- Explosion-proof housing configuration: The CA21000 designation identifies a housing configured for applicable CSA explosion-proof requirements.
- 0.5-meter probe cable: Defines the integral cable supplied with this probe configuration.
- No standoff adapter: Keeps the assembly configured without an additional standoff extension.
- Defined conduit arrangement: Includes one 3/4-14 NPT plug and a 3/4-14 NPT mounting connection.
- Sleeve support requirement: The long penetration requires additional support near the probe to reduce the risk of sleeve resonance.
- Configuration-specific mounting: The complete part number identifies the probe, cable, penetration, fittings, and mounting thread.
Working Principle
The CA21000 housing assembly positions the proximity probe at the required distance from the machine shaft. The housing and sleeve establish the mechanical path from the machine mounting point to the probe tip, while the 3300 XL 8 mm probe performs the actual non-contact measurement.
The probe operates on the eddy-current principle. With a compatible Proximitor sensor supplying the required excitation, the probe generates an electromagnetic field at its tip. When the conductive shaft moves relative to the probe, the gap changes and alters the electrical response of the transducer system. The Proximitor converts that response into a signal that the monitoring equipment can interpret.
The measurement path is:
Conductive Shaft → 3300 XL 8 mm Probe → Integral Probe Cable → Extension Cable → Proximitor Sensor → Monitoring System
The 13.0-inch penetration determines how far the probe reaches into the machine installation. Because the sleeve is relatively long, its mechanical support must also be considered. An unsupported sleeve can resonate and introduce unwanted movement into the probe mounting arrangement, potentially affecting measurement quality.
The housing itself does not process vibration data. Its role is to position and protect the probe installation, while the probe, associated electronics, and monitoring system perform the sensing and signal-processing functions.
Role in a Bently Nevada 3300 XL Proximity Monitoring Architecture
The CA21000-28-05-00-130-04-02 occupies the mechanical installation point in a 3300 XL 8 mm proximity measurement channel. It provides the specified housing, sleeve, probe, and cable arrangement for measuring the relative position of a conductive machine shaft.
| System Element | Function |
|---|---|
| CA21000 Housing Assembly | Supports and houses the probe installation through the machine mounting point |
| 3300 XL 8 mm Proximity Probe | Detects changes in the gap between the probe tip and the shaft target |
| 0.5-Meter Integral Probe Cable | Connects the installed probe to the associated transducer system |
| Compatible Extension Cable | Completes the electrical connection to the Proximitor sensor |
| 3300 XL Proximitor Sensor | Supplies probe excitation and conditions the measurement signal |
| Monitoring Channel | Processes the conditioned signal for shaft-position or vibration monitoring |
| Sleeve Support | Reduces unsupported sleeve movement and resonance risk in the long-penetration installation |
The assembly’s mechanical dimensions and electrical configuration must match the installed measurement channel. In particular, the 13.0-inch penetration, sleeve support, probe cable length, extension cable, and Proximitor configuration should be considered together when planning an installation or replacement.
Industrial Applications
| Application | Typical Use |
|---|---|
| Centrifugal Compressors | Installing proximity probes where the sensing point requires substantial penetration through the machine casing |
| Steam Turbines | Supporting shaft-position and relative-vibration measurement installations |
| Gas Turbines | Providing a configured mounting arrangement for proximity-based shaft monitoring |
| Industrial Generators | Positioning a probe at a designated shaft measurement point |
| Process Pumps | Supporting proximity measurement where the existing machine design requires a long probe sleeve |
| Petrochemical Facilities | Housing a proximity probe in an appropriately certified hazardous-area installation |
| Machinery Protection Systems | Maintaining an established 3300 XL proximity measurement channel |
| Legacy Equipment Maintenance | Replacing a housing assembly while preserving the original penetration, cable, and mounting arrangement |
Installation and Maintenance
- Verify the complete part number: Confirm CA21000-28-05-00-130-04-02 against the installed assembly and equipment records.
- Check hazardous-area certification: Confirm that the CA21000 configuration and its applicable CSA approval conditions meet the requirements of the installation location.
- Verify the mounting thread: Confirm that the machine mounting port matches the specified 3/4-14 NPT interface.
- Confirm the penetration dimension: Check that the 13.0-inch nominal probe penetration reaches the intended sensing location without interfering with internal machine components.
- Install sleeve support: Provide additional support near the probe because the penetration exceeds 12 inches. This reduces the risk of resonance in the unsupported sleeve.
- Inspect the housing and sleeve: Check the aluminum body, stainless steel sleeve, mounting threads, seals, and fittings for visible damage or deformation.
- Verify the fitting arrangement: Confirm the single 3/4-14 NPT plug and ensure that the required conduit connection is properly configured.
- Protect the integral probe cable: Prevent twisting, crushing, sharp bending, or excessive tension on the 0.5-meter cable during installation.
- Check the extension cable and Proximitor: Match the complete transducer arrangement to the installed 3300 XL system requirements.
- Set the probe gap correctly: Establish the required operating gap according to the applicable transducer installation procedure.
- Verify the monitoring signal: Check the probe output and monitoring-channel response before returning the machine to normal operation.
- Record the assembly configuration: Document the complete part number, penetration, sleeve support arrangement, cable routing, and monitoring channel for future maintenance.
Related Components
| Component | Function |
|---|---|
| 3300 XL 8 mm Proximity Probe | Measures the relative distance between the probe tip and a conductive shaft target |
| 3300 XL Extension Cable | Connects the probe’s integral cable to the compatible Proximitor sensor |
| 3300 XL Proximitor Sensor | Excites the probe and converts its response into an electrical output for monitoring |
| Probe Support and Oil Seal, 37948-01 | Supports long sleeves where the installation requires passage through an inner bearing housing |
| 3/4-14 NPT Plug | Closes the specified threaded port in the housing configuration |
| 3300 XL Monitoring Channel | Receives and processes the conditioned proximity signal |
Recommended Related Models
| Model / Product | Product Type | Typical Application |
|---|---|---|
| Bently Nevada CA21000-28-05-00-064-04-02 | Explosion-Proof Housing Assembly | Related configuration with the same 3300 XL 8 mm probe option, 0.5-meter cable, no standoff adapter, and fitting arrangement, but a shorter 6.4-inch penetration |
| Bently Nevada 21000-28-05-00-130-04-02 | Aluminum Proximity Probe Housing Assembly | Related configuration with the same nominal penetration and connection options for applications where the standard 21000 housing is suitable |
| Bently Nevada 21000-28-05-00-030-04-02 | Aluminum Proximity Probe Housing Assembly | Shorter 3.0-inch penetration configuration for installations requiring less probe reach |
| Bently Nevada CA24701 Series | Stainless Steel Explosion-Proof Housing Assembly | Related housing family where a stainless steel housing body is required and the configured assembly meets the application requirements |
| Bently Nevada 3300 XL 8 mm Proximity Probe | Proximity Probe | Related sensing component for a compatible 3300 XL proximity measurement channel |
These configurations differ in penetration, housing construction, or approval status. The standard 21000 version should not be substituted for a CA21000 assembly where the installation requires the applicable explosion-proof housing certification.
Key Advantages
- Combines a 3300 XL 8 mm proximity probe with its housing and cable configuration.
- Provides a defined 13.0-inch nominal probe penetration for deeper mounting locations.
- Uses an aluminum housing body and 304 stainless steel sleeve.
- Specifies the mounting thread and conduit fitting arrangement in the complete part number.
- Supports applicable explosion-proof installations when used within its certification conditions.
- Identifies the long-sleeve support requirement for the selected penetration.
Technical FAQs
What does the 130 code mean in CA21000-28-05-00-130-04-02?
The 130 option specifies a nominal probe penetration of 13.0 inches. This determines the probe’s reach through the sleeve and into the machine installation. The selected mounting geometry must provide sufficient clearance at the sensing tip.
Why does this assembly need additional sleeve support?
The selected penetration exceeds 12 inches. A long unsupported sleeve can resonate, introducing unwanted movement into the probe mounting structure. Additional support near the probe reduces this risk and helps maintain a stable sensing arrangement.
Does the CA21000-28-05-00-130-04-02 include the proximity probe?
Yes. The 28 option identifies a 3300 XL 8 mm proximity probe with multiple approvals as part of the assembly configuration. The corresponding extension cable, Proximitor sensor, and monitoring channel are separate elements of the complete measurement system.
Can a standard 21000 housing replace this CA21000 assembly?
Not automatically. Although the standard 21000 family can use a similar probe, penetration, and fitting arrangement, the CA21000 designation is associated with the applicable CSA explosion-proof housing configuration. Where explosion-proof certification is required, the replacement must meet the site’s approval and installation requirements.