21000-27-05-00-40-03-02 Bently Nevada 21000 Probe Housing Assembly

Engineered Protection for Industrial Proximity Measurement Systems

Bently Nevada 21000-27-05-00-40-03-02 is a proximity probe housing assembly from the 21000 Series. It provides a protected mounting arrangement for reverse mount proximity probes in industrial machinery installations.

This configuration combines a 3300 XL NSv probe option, a 0.5-meter probe cable, and 4.0-inch probe penetration. Its aluminum housing and 304 stainless steel sleeve provide structural support for demanding industrial environments.

The assembly incorporates a dome cover, threaded conduit connections, probe sleeve, O-rings, and sealing components. Its fitting package includes NPT connections and a cable seal grip. These components help organize the probe installation and protect the measurement interface.

The 21000 housing platform supports externally mounted proximity probe installations. Its design addresses mechanical protection, cable routing, environmental sealing, and hazardous-area installation requirements.

01 | Ordering Code Architecture and Configuration Breakdown

The complete part number identifies the probe interface, cable length, mounting arrangement, penetration depth, and fitting package.

Code Segment	Selected Option	Configuration Description
21000	21000	Proximity Probe Housing Assembly
27	Probe Option 27	3300 XL NSv probe with selectable hazardous-area approvals
05	Cable Length 05	0.5 m (20 in)
00	Standoff Adapter 00	No standoff adapter
40	Penetration 40	4.0 inches
03	Fitting Option 03	One 3/4-14 NPT plug, one reducer, and one cable seal grip
02	Mounting Thread 02	3/4-14 NPT

Complete Ordering Number: 21000-27-05-00-40-03-02

Fitting Option 03 – Included Components:

• One 3/4-14 NPT plug.
• One 3/4-14 to 1/2-14 NPT reducer.
• One cable seal grip.
• Interchangeable grommets for different cable diameters.

Cable Seal Grip Compatibility:

• 1/8 to 3/16 inches.
• 1/4 to 5/16 inches.
• 5/16 to 3/8 inches.

Configuration Note: Option 00 specifies no standoff adapter. Option 02 identifies the 3/4-14 NPT mounting thread. Verify the mounting interface against the applicable installation drawing.

02 | Technical Specifications and Mechanical Construction

Specification	Technical Details
Manufacturer	Bently Nevada
Product Number	21000-27-05-00-40-03-02
Product Series	21000
Product Type	Proximity Probe Housing Assembly
Probe Configuration	3300 XL NSv reverse mount probe option
Housing Material	Aluminum
Probe Sleeve Material	304 Stainless Steel
Probe Cable Length	0.5 m (20 in)
Standoff Adapter	Not included
Probe Penetration	4.0 inches
Mounting Thread	3/4-14 NPT
Fitting Configuration	Option 03
Typical Assembly Weight	Approximately 1.1 kg (2.4 lb), without fittings
Maximum C + D Dimension	13.5 inches (34.3 cm), subject to probe visibility configuration
Factory Warranty	12 months

Dimensional Consideration: The supplied maximum dimension is 13.5 inches, equivalent to approximately 34.3 cm. Confirm the applicable C and D reference points before installation.

03 | Housing Architecture and Component Functions

The 21000 Proximity Probe Housing Assembly combines several mechanical and sealing components into one installation arrangement.

Component	Engineering Function
Dome Cover	Provides an enclosed housing access arrangement.
Aluminum Housing Body	Supports the assembly structure and mounting arrangement.
304 Stainless Steel Sleeve	Provides the probe mounting interface.
O-Rings	Support sealing between compatible assembly interfaces.
Reverse Mount Probe	Provides non-contact shaft displacement measurement.
Thread Seal	Supports sealing at designated threaded connections.
Conduit Fittings	Provide cable and conduit connection interfaces.
Standoff Adapter	Provides an optional mounting extension when specified.

The selected configuration does not include a standoff adapter. Its 4.0-inch penetration option defines the selected probe installation geometry.

04 | Probe Measurement Interface and Diagnostic Applications

The assembly supports a compatible 3300 XL NSv proximity measurement arrangement. The probe detects shaft movement without direct mechanical contact.

Typical Diagnostic Applications:

• Shaft Displacement: Monitor changes in shaft position relative to the probe target.
• Radial Vibration: Supply proximity signals for compatible machinery vibration monitoring channels.
• Axial Position: Support axial displacement monitoring when the probe orientation and target arrangement permit.
• Mechanical Clearance: Help engineers evaluate shaft-to-probe positioning during commissioning.
• Signal Stability: Support investigation of abnormal measurement changes and connection problems.

The housing itself does not calculate vibration severity or identify mechanical faults. The connected probe, Proximitor Sensor, and monitor perform the measurement and diagnostic functions.

05 | Suitable Equipment and Industrial Applications

The 21000 housing assembly suits externally mounted proximity probe installations. Engineers can evaluate it for the following equipment.

• Gas Turbines: Protect probe installations used for shaft displacement monitoring.
• Steam Turbines: Support external probe mounting arrangements for rotating shaft measurements.
• Centrifugal Compressors: Provide a protected mounting enclosure for machinery monitoring probes.
• Process Compressors: Organize probe positioning and cable connections in industrial process environments.
• Industrial Pumps: Support suitable bearing housing and shaft monitoring arrangements.
• Power Generation Equipment: Protect externally mounted measurement components in rotating machinery systems.
• Oil and Gas Facilities: Support proximity probe installations requiring suitable hazardous-area protection.

Engineers should evaluate housing material, process exposure, probe orientation, and hazardous-area classification. Confirm actual environmental suitability before selecting the assembly.

06 | Installation and Engineering Verification

Correct installation requires dimensional checks and careful coordination between the probe, sleeve, housing, and cable connections.

Pre-Installation Checks

• Confirm the complete part number and suffix configuration.
• Verify the 3/4-14 NPT mounting interface.
• Check the available mounting depth and 4.0-inch probe penetration.
• Confirm the 0.5-meter probe cable arrangement.
• Inspect the aluminum body and stainless steel sleeve.
• Check O-rings, thread seals, and cable grip grommets.
• Verify the selected probe's hazardous-area approval requirements.

Installation Sequence

1. Prepare the mounting port and inspect its NPT threads.
2. Verify the housing position against the machinery installation drawing.
3. Install the specified probe sleeve and sealing components.
4. Position the reverse mount probe according to the required penetration depth.
5. Connect the selected conduit fittings and cable seal grip.
6. Route the probe cable without excessive tension or bending.
7. Secure the dome cover and inspect the sealing interfaces.
8. Complete electrical checks before commissioning the measurement channel.

Use the manufacturer's installation instructions for sealing methods and tightening requirements. Do not invent torque values for unspecified housing connections.

07 | Commissioning and Maintenance Diagnostics

The housing provides mechanical protection and connection management. Maintenance teams should inspect its mechanical condition alongside the connected probe signal.

Inspection Item	Recommended Diagnostic Action
Housing Cover	Check cover engagement and sealing condition.
Mounting Threads	Inspect for damage, looseness, and incorrect engagement.
Probe Sleeve	Check alignment and mechanical integrity.
O-Rings	Inspect for deformation, wear, and incorrect installation.
Cable Seal Grip	Verify the selected grommet matches the cable diameter.
Probe Position	Confirm penetration and target clearance.
Electrical Connections	Inspect connector engagement and signal continuity.
Monitoring Channel	Review gap voltage, displacement trends, and alarm status.

Practical Troubleshooting:

• Unstable Readings: Inspect the probe connection, cable routing, and mounting stability.
• Unexpected Gap Voltage: Verify probe penetration, target clearance, and probe alignment.
• Moisture Inside the Housing: Inspect the dome cover, O-rings, conduit fittings, and cable grip.
• Loose Mechanical Assembly: Check NPT connections and mounting support.
• Intermittent Signal: Inspect the probe connector and electrical cable for damage.

Record commissioning measurements and housing inspection results. Compare later readings against these baseline records. This practice helps technicians identify installation changes early.

08 | Hazardous-Area Certifications and Compliance

The 21000 and 24701 housing families offer CSA-certified configurations for specified hazardous-area applications. The manufacturer also identifies CSA Type 4 enclosure compliance and API 670 design compliance.

North American Hazardous-Area Classification

Classification	Applicable Rating
Class I	Divisions 1 and 2, Groups C and D
Class II	Divisions 1 and 2, Groups E, F, and G
Class III	Applicable Class III designation
Circuit Protection	Non-incendive when connected according to drawing 140979
Enclosure Type	CSA Type 4

Temperature Classification

Temperature Class	Ambient Temperature
T5	-50°C to +40°C
T4	-50°C to +80°C

Regulatory Compliance:

• CSA: Certified configurations support the specified explosion-proof applications.
• API 670: The housing design complies with the applicable externally mounted proximity probe housing requirements.
• CSA Type 4: The certified enclosure configuration meets the stated enclosure classification.
• RoHS: Compliance with European Directive 2011/65/EU.

Important Ordering Distinction: CA21000 and CA24701 housings serve North American end users. Other end-user countries require the standard 21000 or 24701 housing ordering designation.

The selected probe option 27 offers selectable hazardous-area approvals. Confirm the actual probe approval and housing certification combination before installation. Do not assume that every suffix combination carries identical certification.

09 | Comparison with 21000-34-05-15-29-04-02

Both products belong to the Bently Nevada 21000 proximity housing family. However, their ordering configurations differ and require individual mechanical verification.

Alternative Product: 21000-34-05-15-29-04-02 – Bently Nevada 21000 Proximity Housing Unit

Selection Criteria	21000-27-05-00-40-03-02	21000-34-05-15-29-04-02
Product Family	21000	21000
Probe Option	27 – 3300 XL NSv probe	34 – Verify exact probe configuration
Cable Length	0.5 m	05 suffix; verify option definition
Standoff Adapter	00 – None	15 – Verify adapter specification
Penetration Option	40 – 4.0 inches	29 – Verify penetration specification
Fitting Option	03	04
Mounting Thread	02 – 3/4-14 NPT	02 – Verify thread specification
Primary Selection Focus	3300 XL NSv probe and 4.0-inch penetration	Alternative probe and housing configuration

Technical Selection Recommendations

• Select 21000-27-05-00-40-03-02 when the application requires the specified 3300 XL NSv probe option, 0.5-meter cable, and 4.0-inch penetration.
• Consider 21000-34-05-15-29-04-02 when the existing installation requires its alternative probe and standoff configuration.
• For replacement projects: Compare actual probe type, sleeve length, penetration, fittings, and mounting thread.
• For new installations: Calculate the required probe position from the machinery mounting geometry.
• For hazardous areas: Verify both housing and probe approvals independently.

Engineering Recommendation: Do not substitute these assemblies based only on the shared 21000 series designation. The probe option, standoff adapter, penetration, and fitting configuration determine mechanical compatibility. Obtain the complete dimensional drawings before approving a replacement.

10 | Global PLC Spare HUB's Insight

The 21000-27-05-00-40-03-02 should be selected as a complete mechanical installation assembly, not simply as an enclosure. Its probe option, penetration depth, cable length, and NPT fittings define the installation interface.

One important engineering consideration involves probe penetration. A 4.0-inch penetration configuration must match the distance between the housing mounting reference and the required probe sensing position. Incorrect penetration can restrict probe adjustment or affect target clearance.

The cable seal grip also deserves attention during field installation. Its grommet must match the actual cable outside diameter. Incorrect sizing can compromise the intended cable sealing arrangement.

For hazardous-area projects, engineers should evaluate the complete equipment configuration. Housing certification alone does not establish the approval status of every installed probe. Confirm the applicable CSA classification and probe approval documentation together.

Another practical consideration involves material selection. The aluminum body reduces assembly weight, while the 304 stainless steel sleeve provides a robust probe interface. Engineers should evaluate process exposure and installation conditions before selecting the housing material.

For replacement planning, compare dimensional drawings rather than relying on part-family similarity. This approach reduces mounting errors and helps maintain consistent probe positioning.

11 | Packaging and Commercial Information

• Manufacturer: Bently Nevada.
• Model: 21000-27-05-00-40-03-02.
• Product: Proximity Probe Housing Assembly.
• Configuration: 3300 XL NSv probe option, 0.5-meter cable, and 4.0-inch penetration.
• Condition: New and original in factory packing, as specified by the supplier.
• Warranty: 12 months.
• Shipping: Contact our sales team for available shipping arrangements.

The listed assembly includes its specified housing and fitting configuration. Confirm the final probe, sleeve, seals, and accessory contents against the sales quotation.

12 | Frequently Asked Questions

Q1: How does the housing's aluminum body affect installation planning?

The aluminum body provides a lightweight structural enclosure. Its typical assembly weight reaches approximately 1.1 kg without fittings. Engineers should include additional fitting weight when calculating mounting support requirements.

Q2: How should engineers determine the correct cable seal grip grommet?

Measure the actual cable outside diameter before selecting a grommet. Match the measurement to one of the three supplied diameter ranges. An incorrect grommet size may compromise the intended sealing arrangement.

Q3: What is the engineering significance of the 304 stainless steel probe sleeve?

The sleeve provides a stainless steel interface around the installed probe. It supports the mechanical mounting arrangement and separates the probe installation from the aluminum housing body. Confirm process compatibility before selecting the assembly.

Q4: Can engineers use this housing with a different Bently Nevada proximity probe?

Do not assume universal probe compatibility. This ordering configuration specifies a 3300 XL NSv probe option. Alternative probes require verification of mounting geometry, sleeve dimensions, connector configuration, and hazardous-area approvals.

Q5: What information should engineers verify before replacing an existing 21000 housing?

Record the complete ordering code and inspect the existing installation. Measure penetration depth, mounting thread, cable diameter, and available mounting space. Also verify the probe type, fitting arrangement, and certification requirements before approving the replacement.

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