Bently Nevada 21000-28-05-00-40-03-02 Proximity Probe Housing

Bently Nevada 21000-28-05-00-40-03-02 Proximity Probe Housing Assembly

Product Overview

The Bently Nevada 21000 series protects proximity probes in industrial machinery monitoring systems.

This assembly combines an aluminum housing with a 304 stainless steel probe sleeve. It supports external probe mounting in demanding industrial environments.

The specified configuration includes a reverse-mount 3300 XL 8 mm proximity probe with selectable hazardous-area approvals. Its 0.5 m probe cable supports connections within the housing.

The housing provides a threaded dome cover, conduit ports, sealing components, and cable-entry fittings. Its explosion-proof design supports approved installations in hazardous locations.

• Product number: 21000-28-05-00-40-03-02
• Manufacturer: Bently Nevada
• Product family: 21000 Proximity Probe Housing Assemblies
• Condition: New and original factory packing
• Warranty: 12 months

Technical Specifications

Measurement-system note: The housing does not define probe sensitivity, linearity, resolution, or frequency response. These values depend on the installed probe and its associated Proximitor sensor. Consult the exact probe and driver documentation before designing the measurement channel.

Dimensional note: The supplied source lists 13.5 in and 34.3 mm. These values conflict. The correct conversion is approximately 34.3 cm. Verify the drawing before installation.

Configuration Breakdown

• 21000: Aluminum proximity probe housing family.
• 28: 3300 XL 8 mm probe option, with selectable hazardous-area approvals.
• 05: Probe cable length of 0.5 m.
• 00: No standoff adapter.
• 40: Probe penetration of 4.0 in.
• 03: Fitting package with a 3/4-14 NPT plug, reducer, and cable seal grip.
• 02: 3/4-14 NPT mounting thread.

The cable seal grip includes grommets for cable diameters of 1/8–3/16 in, 1/4–5/16 in, and 5/16–3/8 in. Confirm the selected cable diameter before assembly.

Features and Engineering Advantages

• Probe protection: The housing shields the installed probe and its connections from mechanical exposure.
• Threaded construction: The 3/4-14 NPT interface supports compatible threaded mounting arrangements.
• Sealed cable entry: The specified cable grip and grommets help maintain the enclosure seal.
• Hazardous-area options: Applicable certified configurations support approved installations in classified locations.
• API 670 alignment: The 21000 housing family is designed for externally mounted machinery-monitoring probes under API 670 requirements.
• Service access: The threaded dome cover provides access for inspection and probe replacement.

Typical Applications

• Steam turbines: Protect proximity probes used for shaft vibration and displacement monitoring.
• Centrifugal compressors: Support external probe mounting for machinery protection measurements.
• Industrial pumps: House probes used to monitor shaft movement and vibration.
• Process machinery: Provide a protected probe installation near classified process areas, subject to site approval.
• Machinery protection systems: Support compatible Bently Nevada monitoring channels when the probe, driver, and installation meet system requirements.

Installation Guide

1. Verify the complete part number, probe option, penetration, and mounting thread.
2. Confirm the installation drawing and available clearance around the probe tip.
3. Check the target material and probe-driver compatibility before installation.
4. Install the housing using the specified 3/4-14 NPT interface.
5. Fit the correct cable-seal grommet for the cable diameter.
6. Route the probe cable away from power conductors and strong electromagnetic interference sources.
7. Close the dome cover and verify all sealing interfaces.
8. Follow the manufacturer's torque, grounding, and hazardous-area installation instructions.

Qualified personnel must perform installation in classified areas. Follow applicable electrical codes and site safety procedures.

Commissioning, Diagnostics, and Maintenance

The housing provides mechanical protection. It does not independently measure vibration or generate diagnostic data.

• Initial verification: Check probe identity, cable routing, connector condition, and mechanical clearances.
• Signal verification: Confirm the probe-driver output and gap voltage using the compatible monitoring system.
• Vibration checks: Review shaft vibration, displacement, and alarm status through the connected machinery monitor.
• Fault isolation: Inspect cable connections, sealing points, and probe mounting when readings become unstable.
• Routine maintenance: Check for corrosion, loose fittings, damaged grommets, and compromised enclosure seals.

Field example: A compressor channel shows intermittent vibration alarms after maintenance. Inspect the probe cable grip and connector first. Then verify the gap voltage and cable continuity before changing alarm settings.

This procedure helps distinguish installation faults from genuine shaft vibration. It does not replace the monitoring system's diagnostic instructions.

Compatibility and Selection Guidance

Confirm these interfaces before ordering:

• Probe: Verify the installed probe's exact 3300 XL 8 mm configuration and approval requirements.
• Driver: Use a compatible Proximitor sensor and extension cable for the selected probe system.
• Mounting: Confirm the 3/4-14 NPT thread and 4.0 in penetration suit the machine geometry.
• Cable entry: Match the cable diameter to the supplied seal-grip grommet.
• Hazardous location: Check the complete installation's certification, wiring method, and applicable area classification.

Model Comparison and Technical Recommendation

Compare the specified assembly with the following alternative. The linked product page provides the reference for its configuration.

Selection recommendation: Choose the specified model when its 0.5 m cable, 4.0 in penetration, and mounting arrangement match the installation.

Consider the alternative when its documented cable length, adapter arrangement, or fitting package better suits the machine. Do not assume suffix differences are interchangeable. Verify the full configuration against the installation drawing.

Certifications and Environmental Considerations

• RoHS: The supplied documentation references European Directive 2011/65/EU.
• CSA hazardous-area approvals: Applicable CA21000 housing configurations cover specified North American classified areas.
• Classifications: Listed approvals include Class I, Class II, and Class III locations, subject to the specific certificate and installation conditions.
• Temperature codes: T5 applies from -50°C to +40°C; T4 applies from -50°C to +80°C for the stated certified configuration.
• Enclosure: CSA Type 4 classification applies to certified housing configurations.
• API 670: The housing family supports externally mounted proximity probe installations designed around this machinery protection standard.

Certification depends on the ordered configuration and installation. Verify the current certificate and applicable local requirements before use.

Packaging, Shipping, and Warranty

• Product condition: New and original factory packing.
• Packaging: Supplied in factory packaging, subject to stock configuration.
• Shipping carriers: FedEx, UPS, and DHL.
• Dispatch: Typically within 24–48 hours after order confirmation and availability verification.
• Warranty: 12 months from the applicable warranty start date.

Packaging-list note: The specified assembly includes its configured housing, probe, sealing components, and selected fittings. Confirm the final packing list before shipment. Additional monitoring hardware is not included unless explicitly stated.

Global PLC Spare HUB's Insight

Housing selection affects probe access, cable routing, and long-term measurement reliability. Engineers should verify mechanical fit before reviewing electronic measurement performance.

For example, a compressor retrofit may require a longer penetration or a different cable entry. A matching probe alone does not guarantee a suitable housing installation.

Our recommendation is to compare the full ordering code with the existing installation drawing. Confirm thread engagement, probe position, cable diameter, and hazardous-area approval before replacement.

Frequently Asked Questions

1. Does this housing measure shaft vibration by itself?

No. The housing supports and protects the proximity probe. A compatible probe, driver, and monitoring system provide measurement and diagnostic functions.

2. Can I replace another 21000 housing with this model?

Not without checking the complete ordering code. Compare penetration, mounting thread, adapter requirements, cable length, and fittings. Small configuration differences can affect probe position and sealing.

3. How should I investigate unstable vibration readings?

Inspect the cable entry, connector, and probe mounting first. Then verify the gap voltage and signal continuity. Compare the result with the monitor's diagnostic guidance.

4. Is this model suitable for every hazardous location?

No. Suitability depends on the ordered certification, area classification, temperature conditions, and installation method. Confirm the applicable certificate before installation.

5. What should I confirm before purchasing?

Provide the complete part number, existing probe details, mounting dimensions, cable diameter, and hazardous-area requirements. These details help verify configuration compatibility and reduce installation delays.

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