Product Overview
The Bently Nevada 21000-16-10-15-081-03-02 is a precision-engineered proximity probe housing assembly designed for reliable vibration monitoring in critical rotating machinery. This model, part of the 21000 series, combines a rugged aluminum body with a 304 stainless steel sleeve to deliver exceptional durability in demanding industrial environments. As a new and original unit in factory packing, it ensures authentic performance and long service life.
This housing assembly is configured with a 3300 XL 8 mm probe (option 16) and a 1.0 m (39 in) probe cable (option 10). The standoff adapter length is 1.5 in (38 mm) (option 15), and the probe penetration depth is 8.1 in (option 081). Fittings include one 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, and a cable seal grip with grommets for cable sizes from 1/8 to 3/8 inches. The mounting thread is 3/4-14 NPT (option 02).
Technical Specifications
Below are the key specifications for the Bently Nevada 21000-16-10-15-081-03-02. These values are directly from the manufacturer's data and define the operational envelope of this assembly.
| Parameter |
Value |
| Probe Option |
3300 XL 8 mm probe with connector |
| Probe Cable Length |
1.0 m (39 in) |
| Standoff Adapter |
1.5 in (38 mm) |
| Probe Penetration (Option D) |
8.1 in |
| Mounting Thread |
3/4-14 NPT |
| Material |
Aluminum body with 304 stainless steel sleeve |
| Maximum (C)+(D) with visible probe (P/N and S/N) |
17.0 in (43.18 cm) |
| Maximum (C)+(D) Dimension |
32.9 in (83.5 cm) |
| Weight (typical, without fittings) |
1.1 kg (2.4 lb) |
The adjustment range for probe penetration option D is 13 mm (±0.5 in). For penetration lengths between 1.0 and 2.0 inches, counter boring the machine case may be necessary to reduce side or rear view effects. If the combined penetration (C plus D) exceeds 300 mm (12 in), sleeve support near the probe is required to prevent resonance.
Industry Applications
This housing assembly is ideal for vibration monitoring on turbines, compressors, pumps, and other rotating equipment where shaft displacement must be measured accurately. In a typical refinery application, the 21000-16-10-15-081-03-02 mounts externally on the machine case, protecting the proximity probe while providing a reliable signal to the monitoring system. Its CSA Type 4 enclosure rating and explosion-proof certification (Class 1 Divisions 1 and 2, Groups C and D; Class 2 Divisions 1 and 2, Groups E, F, and G) make it suitable for hazardous areas.
For maintenance teams, this assembly simplifies probe installation and replacement. The dome cover and threaded ports allow easy conduit connections, while the optional standoff adapter accommodates various mounting configurations. The included fittings ensure a secure, leak-proof seal, reducing the risk of contamination and downtime.
Installation & Setup Guidance
Proper installation is critical for accurate measurements. Follow these guidelines when mounting the Bently Nevada 21000-16-10-15-081-03-02:
- Verify the mounting thread (3/4-14 NPT) matches the machine port. If the standoff adapter option is not 00, the mounting thread defaults to 3/4-14 NPT.
- Ensure the probe penetration (option D) is set within the 13 mm (±0.5 in) adjustment range. For penetration lengths between 1.0 and 2.0 inches, counter bore the machine case to minimize side or rear view effects.
- If the total penetration (C plus D) exceeds 300 mm (12 in), add sleeve support near the probe to prevent resonance.
- Use the provided cable seal grip with appropriate grommets (sizes 1/8 to 3/16, 1/4 to 5/16, or 5/16 to 3/8 inches) to secure the cable and maintain the enclosure rating.
- Connect conduit to the threaded ports, ensuring a tight fit to preserve the explosion-proof integrity.
Maintenance & Reliability
Routine inspection of the housing assembly ensures long-term reliability. Check the O-rings and thread seal periodically for wear, especially in high-vibration environments. Verify that the dome cover remains securely tightened and that all fittings are free from corrosion. The aluminum body and stainless steel sleeve resist environmental degradation, but regular cleaning of the exterior helps maintain the enclosure rating.
Because this assembly is CSA certified for hazardous areas, any maintenance must be performed with the power removed and in accordance with local regulations. Replacing worn grommets or fittings promptly prevents moisture ingress and maintains the non-incendive circuit integrity.
Selection Guide & Purchasing Advice
When ordering the 21000-16-10-15-081-03-02, confirm that the suffix codes match your application requirements. The probe option (16) specifies the 3300 XL 8 mm probe, which is a standard choice for many machines. The cable length (10) of 1.0 m suits most installations, but longer cables may be needed for remote monitoring. The standoff adapter (15) and probe penetration (081) must be selected to position the probe tip correctly relative to the shaft.
Verify that your system is compatible with the 8 mm probe format and that the mounting thread is correct. If you have any doubts, consult the manufacturer's documentation or contact a technical specialist. PLC Source PRO offers this new, original unit with a 12-month factory warranty, ensuring you receive a genuine Bently Nevada product.