Product Overview
When machinery reliability is non-negotiable, the Bently Nevada 21000-28-00-00-039-03-02 provides a robust housing solution for 3300 XL 8 mm proximity probes. This Industrial Automation Module is engineered for externally mounted vibration and position monitoring in demanding environments. With a 3.9-inch probe penetration and a 3/4-14 NPT mounting thread, it ensures precise and secure installation. The housing is CSA certified explosion-proof, making it suitable for hazardous areas.
Technical Specifications
The Bently Nevada 21000-28-00-00-039-03-02 is built to exacting standards. Below are the key specifications drawn directly from the manufacturer's data:
| Parameter |
Value |
| Probe Option |
28 – 3300 XL 8 mm probe, selectable hazardous area approvals |
| Probe Cable |
00 – not required |
| Standoff Adapter |
00 – without fittings |
| Probe Penetration |
039 = 3.9 inches |
| Fitting Option |
03 – includes 3/4-14 NPT plug, reducer, and cable seal grip with grommets for cable sizes 1/8-3/16, 1/4-5/16, and 5/16-3/8 inches |
| Mounting Thread |
02 – 3/4-14 NPT |
| Material |
Aluminum body with 304 stainless steel sleeve |
| Weight |
1.1 kg (2.4 lb) typical, without fittings |
Key Features & Benefits
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Explosion-proof design: CSA certified for Class I, Divisions 1 and 2, Groups C and D; Class II, Divisions 1 and 2, Groups E, F, and G; and Class III.
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Compliance: RoHS Directive 2011/65/EU compliant, meeting environmental standards.
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API 670 compliant: Fully compliant with the American Petroleum Institute's standard for externally mounted proximity probe housings.
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Versatile fittings: Includes a 3/4-14 NPT plug, a reducer, and a cable seal grip accommodating multiple cable sizes.
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Durable construction: Aluminum body with a 304 stainless steel sleeve for long-lasting performance.
Industry Applications
The Bently Nevada 21000-28-00-00-039-03-02 is ideal for rotating machinery monitoring in industries such as oil & gas, power generation, and petrochemical processing. Its explosion-proof certification makes it a reliable choice for hazardous environments where safety is critical. For example, in a refinery compressor train, this housing protects the proximity probe, ensuring accurate vibration readings that prevent unplanned downtime. The 3.9-inch probe penetration suits installations requiring a longer reach, while the 3/4-14 NPT thread simplifies mounting in standard ports.
Installation & Setup Guidance
Proper installation is essential for optimal performance. Start by verifying that the mounting thread (3/4-14 NPT) matches your machine's port. Apply a suitable thread sealant to prevent leakage. When routing the probe cable, use the provided cable seal grip with grommets—choose the grommet that matches your cable diameter (1/8-3/16, 1/4-5/16, or 5/16-3/8 inches). Ensure the probe tip is positioned correctly relative to the target surface, typically with a recommended gap as per the 3300 XL probe specifications. Tighten all fittings securely but avoid over-torquing.
Maintenance & Reliability
Regular inspection of the housing and probe assembly is recommended to maintain reliability. Check the O-rings and thread seals for wear, especially in high-vibration environments. Periodically verify that the conduit connections remain tight and that the cable grip is intact. The aluminum body and stainless steel sleeve are corrosion-resistant, but environmental factors like chemical exposure should be assessed. By following a simple maintenance routine, you can extend the service life of the 21000-28-00-00-039-03-02 and avoid costly failures.
Selection Guide & Purchasing Advice
Before purchasing the Bently Nevada 21000-28-00-00-039-03-02, confirm that your application requires a 3.9-inch probe penetration and a 3/4-14 NPT mounting thread. If your installation requires a different penetration length or thread, consider other suffix options in the 21000 series. Also, verify the hazardous area classification of your site to ensure the CSA certification matches your needs. For North American end users, the CA21000 version is available; for other regions, use the standard 21000 housing. PLC Source PRO offers this unit new and in original factory packing, backed by a 12-month warranty. Order with confidence for your critical machinery monitoring needs.