Product Overview
The Bently Nevada 21000-28-05-00-070-01-02 is a precision-engineered Proximity Probe Housing Assembly designed for demanding industrial environments. This Industrial Automation Module provides a robust, explosion-proof enclosure for 3300 XL 8 mm proximity probes, ensuring reliable vibration and position monitoring in rotating machinery.
Built with an aluminum body and a 304 stainless steel sleeve, the 21000-28-05-00-070-01-02 delivers exceptional durability and corrosion resistance. It is CSA certified as a Type 4 enclosure and fully complies with the American Petroleum Institute's (API) 670 Standard for externally mounted proximity probe housings, making it a trusted choice for critical asset protection.
Key Specifications
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Model: 21000-28-05-00-070-01-02
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Probe Option: 3300 XL 8 mm probe with connector, selectable hazardous area approvals
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Probe Cable Length: 0.5 m (20 in)
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Standoff Adapter: 0 in
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Probe Penetration: 7 in
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Fitting Option: One 3/4-14 NPT explosion-proof fitting and one 3/4-14 NPT plug
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Mounting Thread: 3/4-14 NPT
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Material: Aluminum body with 304 stainless steel sleeve
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Weight: 1.1 kg (2.4 lb) typical, without fittings
Technical Specifications
The table below summarizes the critical dimensional and compliance data for the Bently Nevada 21000-28-05-00-070-01-02. These values are directly from the manufacturer's documentation.
| Parameter |
Value |
| Probe Cable Length |
0.5 m |
| Maximum (C) + (D) Dimension (with visible probe P/N and S/N) |
Not visible |
| Maximum (C) + (D) Dimension |
13.5 in (34.3 mm) |
| Weight (without fittings) |
1.1 kg (2.4 lb) typical |
| Housing Material |
Aluminum body with 304 stainless steel sleeve |
| Enclosure Rating |
CSA Type 4 |
| Explosion-Proof Certification |
Class I Divisions 1 and 2 Groups C and D; Class II Divisions 1 and 2 Groups E, F, and G; Class III |
| Temperature Code |
T5 @ Ta = -50°C to +40°C; T4 @ Ta = -50°C to +80°C |
| Compliance |
RoHS Directive 2011/65/EU |
Industry Applications
The 21000-28-05-00-070-01-02 excels in applications where reliable vibration and position sensing are critical. Typical use cases include:
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Turbomachinery Monitoring: Steam turbines, gas turbines, and compressors require precise shaft vibration measurement. This housing ensures the probe remains stable and protected, even in hazardous areas.
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Pump and Motor Protection: In petrochemical or refining plants, continuous monitoring of pumps and motors prevents unplanned downtime. The explosion-proof design allows installation in Class I, Division 1 locations.
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Generators and Large Rotating Equipment: For generators and other large assets, the housing's robust construction and API 670 compliance make it a preferred choice for OEM and retrofit projects.
By choosing the Bently Nevada 21000-28-05-00-070-01-02, you gain a housing that meets stringent safety standards while delivering long-term reliability—a key factor in reducing total cost of ownership.
Installation & Setup Guidance
Proper installation is essential for accurate measurements. Follow these guidelines:
- Ensure the mounting thread (3/4-14 NPT) is clean and properly sealed. The housing includes one 3/4-14 NPT explosion-proof fitting and one plug; install these according to local electrical codes.
- Verify the probe penetration depth (7 in) matches your machine's bearing clearance. Incorrect penetration can lead to false readings or physical damage.
- Route the probe cable (0.5 m) without sharp bends or stress. Use the provided conduit connection points to maintain the explosion-proof integrity.
- After mounting, verify the probe tip is positioned correctly relative to the shaft surface. Consult the Bently Nevada installation manual for gap voltage settings.
Always follow the manufacturer's instructions and applicable safety regulations when installing in hazardous areas.
Maintenance & Reliability
The 21000-28-05-00-070-01-02 is designed for minimal maintenance. However, periodic inspections are recommended:
- Check the dome cover and threaded ports for signs of wear or corrosion. The aluminum body and stainless steel sleeve resist most industrial environments.
- Inspect the O-rings and thread seal during routine shutdowns. Replace them if they show cracking or deformation.
- Verify that the conduit fittings remain tight to preserve the explosion-proof rating.
- Confirm the probe cable is not chafed or damaged, especially near the housing exit.
Regular checks not only extend the life of the housing but also prevent unexpected failures in your monitoring system.
Selection Guide & Purchasing Advice
When ordering the Bently Nevada 21000-28-05-00-070-01-02, verify the suffix codes match your requirements:
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Probe Option (28): 3300 XL 8 mm probe with connector—choose the hazardous area approval level as needed.
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Cable Length (05): 0.5 m—confirm this is sufficient for your routing.
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Standoff Adapter (00): 0 in—if you need a standoff, select the appropriate option and note that the mounting thread option must be specified.
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Probe Penetration (070): 7 in—must match your machine's dimensions.
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Fitting (01): One 3/4-14 NPT explosion-proof fitting and one plug—standard for most installations.
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Mounting Thread (02): 3/4-14 NPT—required when standoff adapter is not 00.
For North American end users, the CA21000 version is available with CSA certification. For all other regions, the standard 21000 is required. PLC Source PRO offers this item as new and original, with factory packing and a 12-month warranty.