Technical Specifications Breakdown
Key parameters for the 21000-34-00-15-039-04-02 are listed below for quick reference:
| Feature | Specification |
|---|---|
| Model | 21000 - Proximity Probe Housing Assemblies |
| Probe Option | 34 = 3300 XL 8 mm probe with connector protector, selectable hazardous area approvals |
| Probe Cable Length | 00 = Probe cable not required |
| Standoff Adapter | 15 = 1.5 in |
| Probe Penetration | 039 = 3.9 in |
| Fitting Option | 04 = One 3/4-14 NPT plug only |
| Mounting Thread Option | -02 - 3/4-14 NPT |
| Material | 21000 Aluminum body with 304 stainless steel sleeve |
| Weight | 1.1 kg (2.4 lb) typical, without fittings |
Application Versatility in Rotating Machinery
The 1.5 in standoff adapter and 3.9 in probe penetration allow precise positioning relative to the shaft. The aluminum body with 304 stainless steel sleeve provides corrosion resistance and mechanical strength. For intrinsically safe applications, you can order hazardous area approved proximity probes with this housing. The selectable hazardous area approvals give flexibility for different site classifications.
Installation Guidance for Reliable Performance
When installing the 21000-34-00-15-039-04-02, ensure the mounting thread (3/4-14 NPT) is properly sealed to maintain the explosion-proof integrity. The assembly includes a dome cover, threaded ports for conduit connections, a probe sleeve, O-rings, a reverse mount proximity probe, a thread seal, and optional conduit fittings. Use only approved cable glands and conduit seals to preserve the CSA rating. Verify that the probe tip extends the correct distance from the housing face per the manufacturer's specifications.
Maintenance and Reliability Considerations
Periodically inspect the housing for signs of corrosion, damage to the dome cover, or degradation of O-rings. Check that all threaded connections remain tight. The 304 stainless steel sleeve resists rust, but the aluminum body should be protected from harsh chemicals. Regular inspection intervals depend on the operating environment; quarterly checks are recommended in severe conditions. Always follow site safety procedures when working in hazardous areas.
Robust Protection for Critical Vibration Monitoring
When protecting rotating machinery, the housing that secures your proximity probe is as vital as the probe itself. The Bently Nevada 21000-34-00-15-039-04-02 provides a rugged, field-proven enclosure designed for demanding industrial environments. This assembly ensures reliable, accurate vibration measurements by maintaining precise probe positioning and shielding the sensor from contaminants and mechanical damage.

Designed for Hazardous Area Compliance
This housing assembly is engineered for use in explosive environments. The 21000-34-00-15-039-04-02 is available with Canadian Standards Association (CSA) approvals and is rated explosion proof for hazardous areas. It is certified as a CSA Type 4 enclosure, ensuring protection against dust, water ingress, and corrosive atmospheres. The assembly fully complies with the American Petroleum Institute's API 670 Standard for externally mounted proximity probe housings, making it a trusted choice for oil and gas, petrochemical, and power generation applications.

Selection Guide and Purchasing Advice
When selecting the 21000-34-00-15-039-04-02, confirm that the probe option (34) and mounting thread (-02) match your application requirements. The standoff adapter and penetration lengths are fixed, so verify shaft clearance and housing dimensions before ordering. 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 | 21000-34-00-15-039-04-02 |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
