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Product Overview
The Bently Nevada CA24701-28-10-35-027-03-02 is a stainless-steel proximity probe housing assembly configured for external mounting of a 3300 XL 8 mm proximity probe. It combines a reverse-mount probe, a 1-meter probe cable, a 3.5-inch standoff adapter, a 2.7-inch probe penetration, and a defined conduit fitting arrangement. The 24701 housing uses a 303 stainless-steel body with a 304 stainless-steel probe sleeve.
This assembly is particularly relevant to rotating machinery where the proximity probe must reach a shaft measurement point through a machine casing or bearing housing. On a compressor or turbine, the probe measures the distance between its sensing tip and a conductive shaft target. The external housing arrangement allows access to the probe and its mounting components without requiring the same installation approach as a probe mounted directly into the machine casing.
The selected dimensions define how the probe reaches the measurement surface. The 3.5-inch standoff adapter positions the housing relative to the machine, while the 2.7-inch penetration determines the probe’s reach inside the mounting arrangement. Together, these dimensions establish a nominal C-plus-D dimension of 6.2 inches, subject to the specified adjustment range and final installation geometry.
The complete part number also specifies the electrical and mechanical connection details. The 28 option identifies a 3300 XL 8 mm probe with selectable hazardous-area approvals, 10 specifies a 1-meter probe cable, 35 identifies the 3.5-inch standoff adapter, and 027 specifies the 2.7-inch probe penetration. The 03 fitting option includes a plug, reducer, and cable seal grip, while 02 specifies a 3/4-14 NPT mounting thread.
One configuration detail is particularly important: the E:03 fitting option is not among the CA24701 fitting configurations covered by the stated CSA explosion-proof rating. The exact configuration must therefore be resolved before it is treated as a CSA explosion-proof assembly for hazardous-area installation.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Bently Nevada |
| Model | CA24701-28-10-35-027-03-02 |
| Product Family | 24701 Series |
| Product Type | Explosion-Proof Housing Assembly |
| Probe Type | 3300 XL 8 mm Proximity Probe |
| Probe Approval Configuration | Selectable hazardous-area approvals |
| Probe Cable Length | 1 meter |
| Standoff Adapter Length | 3.5 inches |
| Probe Penetration | 2.7 inches |
| Nominal C + D Dimension | 6.2 inches |
| Maximum C + D Dimension for 1-Meter Cable | 29.2 inches (742 mm) |
| Housing Body Material | 303 stainless steel |
| Probe Sleeve Material | 304 stainless steel |
| Fitting Option | One 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, and one cable seal grip with grommets |
| Cable Seal Grip Size Ranges | 1/8–3/16 inches, 1/4–5/16 inches, and 5/16–3/8 inches |
| Mounting Thread | 3/4-14 NPT |
| CSA Explosion-Proof Configuration | E:00, E:01, E:02, or E:04; E:03 is excluded |
| Weight | 1.8 kg |
Product Features
- 3300 XL 8 mm probe integration: Includes the specified proximity probe with selectable hazardous-area approvals.
- Stainless-steel housing construction: Uses a 303 stainless-steel body and a 304 stainless-steel probe sleeve.
- 1-meter integral probe cable: Defines the cable length between the probe and the extension-cable connection.
- 3.5-inch standoff adapter: Establishes the required spacing between the machine mounting point and the probe housing.
- 2.7-inch probe penetration: Defines the probe’s reach through the sleeve toward the measurement target.
- Configured conduit fittings: The E:03 option includes a threaded plug, reducer, and cable seal grip with specified grommet ranges.
- 3/4-14 NPT mounting thread: Provides the housing’s specified mounting interface.
- External probe access: Allows access to the probe and its mounting arrangement from outside the machine casing.
- System-specific configuration: The ordering reference defines the probe, cable, adapter, penetration, fittings, and mounting thread.
- Hazardous-area configuration considerations: The CA24701 designation alone does not establish CSA explosion-proof approval for every fitting combination.
Working Principle
The CA24701 assembly positions the proximity probe at a controlled distance from a conductive machine shaft. The housing, standoff adapter, and probe sleeve establish the mechanical mounting arrangement; the 3300 XL 8 mm probe performs the actual displacement measurement.
The probe operates through eddy-current sensing. When connected to its compatible Proximitor sensor, the probe generates an electromagnetic field at its tip. As the distance between the probe tip and the conductive shaft changes, the electrical response of the transducer system changes. The Proximitor converts this response into an output that the monitoring equipment can use to measure shaft position or relative vibration.
The measurement chain is:
Conductive Shaft → 3300 XL 8 mm Proximity Probe → Integral Probe Cable → Compatible Extension Cable → Proximitor Sensor → Monitoring System
The standoff adapter and probe penetration serve different mechanical purposes. The adapter establishes the external offset from the machine mounting point, while the penetration defines how far the probe extends toward the shaft. Both dimensions must match the machine geometry to achieve the required sensing position.
The 1-meter probe cable is only one part of the complete electrical system. The extension cable and Proximitor must also match the required transducer configuration. Incorrect cable selection can affect the system’s electrical response even when the housing and probe fit mechanically.
Role in a Bently Nevada 3300 XL Proximity Monitoring Architecture
The CA24701-28-10-35-027-03-02 provides the mechanical mounting arrangement for a 3300 XL 8 mm proximity measurement channel. It supports the probe at the machine, while the associated electrical components transmit the measurement to the monitoring system.
| System Element | Function |
|---|---|
| CA24701 Housing Assembly | Houses and supports the externally mounted probe |
| 3300 XL 8 mm Proximity Probe | Measures the distance to a conductive shaft target |
| 1-Meter Probe Cable | Carries the probe signal to the extension-cable connection |
| Compatible Extension Cable | Connects the probe assembly to the Proximitor sensor |
| 3300 XL Proximitor Sensor | Excites the probe and conditions its electrical response |
| 3300 XL Monitoring Channel | Processes the conditioned signal for shaft-position or vibration monitoring |
| Machine Mounting Point | Establishes the housing position and probe alignment relative to the shaft |
The complete channel depends on the correct combination of probe, cable, Proximitor, and monitor. Mechanical compatibility alone is insufficient if the electrical configuration or hazardous-area requirements differ from those of the existing installation.
Industrial Applications
| Application | Typical Use |
|---|---|
| Centrifugal Compressors | Mounting proximity probes to monitor relative shaft movement |
| Steam Turbines | Supporting shaft-position and vibration measurement points |
| Gas Turbines | Installing a proximity probe through a configured machine mounting arrangement |
| Industrial Generators | Providing an external mounting system for shaft proximity measurement |
| Process Pumps | Supporting non-contact shaft monitoring where the machine design requires a housing assembly |
| Petrochemical Machinery | Installing proximity measurement components subject to the applicable hazardous-area requirements |
| Machinery Protection Systems | Maintaining existing 3300 XL proximity monitoring channels |
| Legacy Equipment Maintenance | Replacing a housing assembly while retaining the established standoff, penetration, and cable arrangement |
Installation and Maintenance
- Verify the complete part number: Confirm CA24701-28-10-35-027-03-02 against the installed assembly and maintenance documentation.
- Check the hazardous-area configuration: Resolve the E:03 fitting option before treating the assembly as CSA explosion-proof. Use a fitting configuration that meets the installation’s applicable certification requirements.
- Confirm the mounting thread: Check that the machine mounting port matches the specified 3/4-14 NPT interface.
- Verify the standoff dimension: Confirm that the 3.5-inch adapter places the housing at the required position relative to the machine casing.
- Check probe penetration: Ensure that the 2.7-inch penetration reaches the intended sensing position without interfering with internal machine components.
- Inspect the housing and sleeve: Check the 303 stainless-steel body, 304 stainless-steel sleeve, threaded connections, and sealing surfaces for damage or corrosion.
- Verify the fitting arrangement: Confirm the plug, reducer, and cable seal grip specified by the E:03 option, including the applicable grommet size for the connected cable.
- Protect the probe cable: Avoid twisting, crushing, or sharply bending the 1-meter integral cable during installation.
- Match the extension cable and Proximitor: Confirm that the complete transducer system uses the correct electrical configuration and total cable length.
- Set the probe gap correctly: Establish the required operating gap according to the applicable 3300 XL installation procedure.
- Verify the measurement signal: Check the Proximitor output and monitoring-channel response before returning the machine to normal operation.
- Record the final configuration: Document the assembly reference, cable arrangement, mounting dimensions, fitting configuration, hazardous-area approval, and monitoring channel.
Related Components
| Component | Function |
|---|---|
| 3300 XL 8 mm Proximity Probe | Detects changes in the distance between the probe tip and the conductive shaft |
| 3300 XL Extension Cable | Connects the integral probe cable to the compatible Proximitor sensor |
| 3300 XL Proximitor Sensor | Supplies probe excitation and converts the sensing response into a usable electrical output |
| Probe Support and Oil Seal, 37948-01 | Supports long probe sleeves where the installation requires passage through an inner bearing housing |
| 3/4-14 NPT Plug | Closes the specified threaded port |
| 3/4-14 to 1/2-14 NPT Reducer | Adapts the designated threaded connection in the E:03 fitting arrangement |
| Cable Seal Grip and Grommets | Secures the cable entry for a compatible cable diameter |
| 3300 XL Monitoring Channel | Receives and processes the conditioned proximity signal |
Recommended Related Models
| Model / Product | Product Type | Typical Application |
|---|---|---|
| Bently Nevada 24701-28-10-35-027-03-02 | Stainless-Steel Proximity Probe Housing Assembly | Related reference with the same probe, cable, adapter, penetration, fitting, and mounting-thread configuration |
| Bently Nevada CA24701-28-10-35-027-01-02 | Explosion-Proof Housing Assembly | Related fitting configuration with one explosion-proof fitting and one plug; confirm the full ordering configuration before selection |
| Bently Nevada CA24701-28-10-35-027-04-02 | Explosion-Proof Housing Assembly | Related fitting configuration with one 3/4-14 NPT plug only |
| Bently Nevada 3300 XL 8 mm Proximity Probe | Proximity Probe | Sensing component for a compatible 3300 XL proximity measurement channel |
| Bently Nevada 3300 XL Extension Cable | Extension Cable | Connects the installed probe to the compatible Proximitor sensor |
| Bently Nevada 3300 XL Proximitor Sensor | Proximity Signal Conditioner | Conditions the probe signal for the monitoring system |
The alternative housing references have different fitting arrangements. Confirm the required CSA approval, connector routing, cable entry, and mounting dimensions before using any alternative.
Key Advantages
- Combines an 8 mm proximity probe with a defined stainless-steel housing arrangement.
- Specifies a 1-meter probe cable, 3.5-inch standoff adapter, and 2.7-inch penetration.
- Provides a defined mounting thread and conduit fitting configuration.
- Supports external probe access for installation and maintenance.
- Allows the complete housing configuration to be identified through its ordering reference.
Technical FAQs
What does the 35 code mean in CA24701-28-10-35-027-03-02?
The 35 option specifies a 3.5-inch standoff adapter. It establishes the offset between the machine mounting point and the housing, working together with the 2.7-inch probe penetration to determine the nominal C-plus-D dimension.
What does the 027 code specify?
The 027 option represents a nominal probe penetration of 2.7 inches. This dimension defines the probe’s reach through the housing sleeve toward the conductive shaft target.
Is this exact E:03 configuration CSA explosion-proof?
The E:03 fitting option is not among the fitting configurations listed for CSA explosion-proof-rated CA24701 housings. The supplied model reference should therefore not be treated as an approved CSA explosion-proof assembly without resolving the configuration.
Does the 1-meter probe cable mean the complete measurement system uses only 1 meter of cable?
No. The 1-meter specification refers to the probe cable included in this assembly. The extension cable between the probe and Proximitor is a separate part of the complete transducer system. Their combined electrical configuration must match the associated Proximitor and monitoring channel.