Technical Specifications Breakdown
Key parameters for the 21000-28-05-20-018-03-02 are listed below for quick reference:
| Feature | Specification |
|---|---|
| Model | 21000 - Proximity Probe Housing Assemblies |
| Probe Type | 3300 XL 8 mm probe, selectable hazardous area approvals |
| Probe Cable Length | 0.5 m (20 in) |
| Standoff Adapter Length (Option C) | 2 in |
| Probe Penetration (Option D) | 1.8 in |
| Fittings Option | One 3/4-14 NPT plug, One 3/4-14 to 1/2-14 NPT reducer, One cable seal grip with grommets |
| Mounting Thread Option | 3/4-14 NPT |
| Material | Aluminum body with 304 stainless steel sleeve |
| Weight | 1.1 kg (2.4 lb) typical, without fittings |
| Maximum (C) + (D) Dimension | 13.5 in (34.3 cm) |
Industry Applications and Operational ROI
By using the 21000-28-05-20-018-03-02, you reduce the risk of unscheduled downtime through continuous vibration monitoring. The CSA Type 4 enclosure rating and API 670 compliance ensure long-term reliability, translating to lower maintenance costs and improved asset utilization.

Installation and Setup Guidance
When installing this housing assembly, ensure the probe penetration length (C plus D) is between 1.0 and 2.0 inches; counter boring the machine case may be necessary to reduce side view or rear view effects. If the combined length exceeds 300 mm (12 in), add sleeve support near the probe to prevent resonance. The adjustment range of probe penetration option D is 13 mm (± 0.5 in). Always use the provided 3/4-14 NPT mounting thread and fittings for a secure seal.
Maintenance and Reliability
Periodically inspect the O-rings and thread seal for wear, and verify that the cable seal grip grommets are intact. The aluminum body with 304 stainless steel sleeve resists corrosion in demanding environments. For optimal performance, keep the dome cover tightly secured and check conduit connections during routine maintenance.
Robust Protection for Critical Machinery Monitoring
This housing assembly is engineered to safeguard your 3300 XL 8 mm probe, ensuring accurate measurement of shaft vibration and position in rotating machinery such as turbines, compressors, and pumps.

Selection Guide and Purchasing Advice
When ordering the 21000-28-05-20-018-03-02, confirm that the suffix codes match your application requirements: probe cable length, standoff adapter length, probe penetration, fittings, and mounting thread. 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 | 21000-28-05-20-018-03-02 |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
