Technical Specifications Breakdown
Key parameters for the 21000-28-10-20-018-04-02 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 Cable Length | 10: 1.0 m (39 in) |
| Standoff Adapter | 20: 2 in |
| Probe Penetration | 018: 1.8 in |
| Fitting Option | 04: One 3/4-14 NPT plug only |
| Mounting Thread Option | 02: 3/4-14 NPT |
| Material | Aluminum body with 304 stainless steel sleeve |
| Weight | 1.1 kg (2.4 lb) typical, without fittings |
Application in Turbomachinery and Rotating Equipment
This housing assembly is purpose-built for externally mounted proximity probes on critical rotating machinery such as steam turbines, compressors, and pumps. Its compliance with the American Petroleum Institute's API 670 Standard ensures it meets the rigorous requirements of the oil and gas, power generation, and petrochemical industries.

Installation Guidance for Hazardous Environments
Proper installation of the housing assembly is critical for reliable vibration monitoring. The unit features a 3/4-14 NPT mounting thread and includes one 3/4-14 NPT plug for conduit connections. Ensure that all connections are sealed according to the manufacturer's guidelines to maintain the explosion-proof rating. The 21000-28-10-20-018-04-02 is rated for use in Class I Divisions 1 and 2 Groups C and D, as well as Class II Divisions 1 and 2 Groups E, F, and G, with enclosure Type 4. For intrinsically safe applications, order hazardous area approved proximity probes with this housing.
Maintenance and Reliability Considerations
To ensure long-term reliability, inspect the housing assembly periodically for signs of corrosion or mechanical damage, especially in harsh environments. The aluminum body with 304 stainless steel sleeve offers resistance to corrosion. The assembly includes O-rings and a thread seal to maintain environmental integrity. Always verify that the probe cable length of 1.0 m is adequate for your routing path, as the maximum (C) + (D) dimension with visible probe is 17.0 in (43.18 cm).
Robust Protection for Critical Machinery Monitoring
When selecting a housing assembly for proximity probes in demanding industrial environments, the Bently Nevada 21000-28-10-20-018-04-02 stands out as a reliable choice. This component is engineered to safeguard sensitive vibration sensors while maintaining accurate measurement in hazardous areas.

Selection Guide and Purchasing Advice
When evaluating the Bently Nevada 21000-28-10-20-018-04-02 for your application, confirm that the probe penetration of 1.8 in and standoff adapter of 2 in match your machine's geometry. This assembly is supplied new and in original factory packing with a 12-month warranty from AutoDCSTech. Please verify current lifecycle status and availability with AutoDCSTech before ordering to ensure compatibility with your existing monitoring system.
Availability & Condition at AutoDCSTech
| Part Number | 21000-28-10-20-018-04-02 |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
