Technical Specifications Breakdown
Key parameters for the 21000-34-10-20-018-04-02 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 | 10 = 1.0 m (39 in) |
| Standoff Adapter | 20 = 2.0 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 |
Industry Applications
Turbine and Compressor Monitoring
In steam turbines and centrifugal compressors, shaft vibration must be measured with minimal interference. The 21000-34-10-20-018-04-02 provides a rigid, repeatable mounting point for the 3300 XL probe, reducing measurement uncertainty. The 2.0 in standoff adapter and 1.8 in probe penetration allow precise gap setting for API 670 compliance.
Hazardous Area Installations
With selectable hazardous area approvals and CSA Type 4 enclosure rating, this housing is suited for refineries and chemical plants. The aluminum body and stainless steel sleeve resist corrosion while the explosion-proof design meets safety requirements.
Pump and Motor Protection
Large pumps and motors benefit from continuous proximity monitoring.

Installation & Setup Guidance
Before installation, verify that the mounting thread (3/4-14 NPT) matches the machine port. The standoff adapter should be adjusted to achieve the correct probe gap per the manufacturer's instructions. Use the supplied O-rings and thread seal to prevent leakage. For hazardous areas, ensure conduit fittings are properly rated and sealed.
Maintenance & Reliability
Periodically inspect the housing for signs of corrosion or mechanical damage. Check that the dome cover is tight and O-rings are not degraded. The 304 stainless steel sleeve provides resistance to process fluids, but regular visual checks are recommended in aggressive environments.
Robust Protection for Critical Vibration Monitoring
When uptime depends on accurate vibration data, the housing that protects your proximity probe is just as important as the probe itself. The Bently Nevada 21000-34-10-20-018-04-02 is a purpose-built proximity probe housing assembly designed for harsh industrial environments. It secures a 3300 XL 8 mm probe with connector protector, ensuring reliable clearance and vibration measurements on rotating machinery.

Selection Guide & Purchasing Advice
When selecting a replacement housing, confirm that the suffix codes match your original configuration. The 21000-34-10-20-018-04-02 is a new original Bently Nevada unit in factory packaging. AutoDCSTech stocks this assembly and offers a 12-month warranty. Please verify current lifecycle status and availability with AutoDCSTech before ordering.
Availability & Condition at AutoDCSTech
| Part Number | 21000-34-10-20-018-04-02 |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
