Technical Specifications Breakdown
Key parameters for the 21000-28-00-00-039-03-02 are listed below for quick reference:
| Feature | Specification |
|---|---|
| Model | 21000 Proximity Probe Housing Assemblies |
| Probe Option | 28 3300 XL 8 mm probe, selectable hazardous area approvals |
| Probe Penetration | 039 = 3.9 in |
| Mounting Thread | 02 3/4-14 NPT |
| Material | 21000 Aluminum body with 304 stainless steel sleeve |
| Weight | 1.1 kg (2.4 lb) typical, without fittings |
| Certifications | CSA Type 4, Explosion-proof, API 670 compliant |
Industry Applications and Operational ROI
This housing assembly is engineered for critical turbomachinery including steam turbines, compressors, and pumps. By providing a secure, certified enclosure, it reduces unplanned downtime caused by probe failure or environmental ingress. The 21000-28-00-00-039-03-02 supports continuous machinery health monitoring, directly improving maintenance planning and extending asset life. Compared to generic enclosures, this Bently Nevada solution offers field-proven reliability and full compliance with API 670 standards, minimizing integration risk.

Installation and Setup Guidance
When installing the 21000-28-00-00-039-03-02, ensure the mounting surface is clean and flat. Use the supplied 3/4-14 NPT plug and reducer as needed. The cable seal grip accommodates cable diameters from 1/8 to 3/8 inches. Verify that the probe sleeve length matches the required gap for your application. Always follow the manufacturer's wiring diagram (drawing 140979) for non-incendive circuit connections in hazardous areas.
Maintenance and Reliability
Periodically inspect the housing for signs of corrosion or damage, especially in harsh environments. Check that all fittings and seals remain tight to maintain the explosion-proof rating. The aluminum body and 304 stainless steel sleeve offer resistance to chemical exposure. No internal adjustments are required; routine visual checks suffice to ensure long-term reliability.
Robust Protection for Critical Vibration Monitoring
In rotating machinery monitoring, the housing assembly that secures the proximity probe is as vital as the probe itself. The Bently Nevada 21000-28-00-00-039-03-02 provides a rugged, explosion-proof enclosure designed for demanding industrial environments. This assembly ensures reliable, repeatable vibration and position measurements while safeguarding the probe from contaminants and mechanical damage.

Selection Guide and Purchasing Advice
Choose the 21000-28-00-00-039-03-02 when you need a pre-configured assembly with a 3.9-inch probe penetration and 3/4-14 NPT mounting. For different probe lengths or fitting options, consult the suffix code table. AutoDCSTech stocks this assembly as new and original in factory packing with a 12-month warranty. Please verify current lifecycle status and availability with AutoDCSTech before ordering.
Availability & Condition at AutoDCSTech
| Part Number | 21000-28-00-00-039-03-02 |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
