Product Overview
In rotating machinery monitoring, precise vibration and position sensing depend on a robust, correctly mounted proximity probe. The Bently Nevada 21000-16-05-15-093-03-02 Proximity Probe Housing Assembly delivers exactly that. This industrial automation module is engineered to protect a 3300 XL 8 mm probe while providing secure mounting in demanding environments. With a 0.5 m (20 in) probe cable, a 1.5 in (38 mm) standoff adapter, and a probe penetration (Option D) of 9.3 in, this assembly is ready for installation on machinery where reliable clearance and vibration data are critical.
This housing assembly is part of the trusted 21000 series from Bently Nevada, designed for externally mounted proximity probes. It meets the American Petroleum Institute's (API) 670 Standard, ensuring it aligns with industry best practices for probe mounting. The 21000-16-05-15-093-03-02 is a new, original unit in factory packing, backed by a 12-month factory warranty.
Technical Specifications
Every component of the 21000-16-05-15-093-03-02 is built for reliability in harsh industrial settings. The following specifications are directly from the product data:
| Specification |
Detail |
| Probe Option |
3300 XL 8 mm probe with connector |
| Probe Cable Length |
0.5 m (20 in) |
| Standoff Adapter |
1.5 in (38 mm) |
| Probe Penetration (Option D) |
9.3 in |
| Fittings |
One 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, one cable seal grip with grommets for cable sizes 1/8 to 3/16 in, 1/4 to 5/16 in, and 5/16 to 3/8 in |
| Mounting Thread |
3/4-14 NPT |
| Material |
Aluminum body with 304 stainless steel sleeve |
| Maximum (C) + (D) Dimension |
13.5 in (34.3 cm) with 0.5 m cable (probe P/N and S/N not visible) |
| Weight |
1.1 kg (2.4 lb) typical, without fittings |
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. The standoff adapter is included as specified.
Real-World Applications
The 21000-16-05-15-093-03-02 is ideal for monitoring critical rotating equipment such as turbines, compressors, and pumps. Its CSA certification for explosion-proof applications makes it suitable for hazardous areas classified as Class 1 Divisions 1 and 2 Groups C and D, and Class 2 Divisions 1 and 2 Groups E, F, and G. This housing assembly ensures reliable vibration and position sensing even in explosive atmospheres, helping to prevent unscheduled downtime.
In a typical installation, the 21000-16-05-15-093-03-02 mounts externally to the machine case, protecting the probe from environmental damage while maintaining accurate gap measurements. The 9.3 in probe penetration allows the probe to reach the target shaft without interference, and the 1.5 in standoff adapter simplifies alignment. This configuration is particularly effective in retrofit projects where existing probe housings need upgrading to meet API 670 standards.
Installation & Setup Guidance
Proper installation is critical for accurate readings. Follow these steps for the 21000-16-05-15-093-03-02:
- Select a mounting location that provides a clear line of sight to the target surface, avoiding any obstructions that could cause side-view or rear-view effects. For probe penetration lengths between 1.0 and 2.0 inches, counter boring the machine case may be necessary to reduce such effects.
- Use the 3/4-14 NPT mounting thread for a secure fit. If you select a probe penetration length (C plus D) greater than 300 mm (12 in), add sleeve support near the probe to prevent resonance.
- Adjust the probe penetration (Option D) within its 13 mm (± 0.5 in) range to achieve the desired gap. Use the cable seal grip with grommets to secure the probe cable and maintain the enclosure rating.
Ensure all fittings are tightened to avoid leaks in hazardous areas. The housing is rated CSA Type 4, so it is protected against water and dust ingress.
Maintenance & Reliability
Regular inspection of the housing assembly ensures long-term reliability. Check the O-rings and thread seal for wear during routine maintenance. Verify that the cable seal grip remains tight to maintain the explosion-proof rating. Environmental factors such as high temperatures (up to 80 °C) are accommodated, but always confirm the operating temperature stays within the T4 or T5 ratings as applicable.
Inspect the probe and cable for any damage, especially if the machine experiences vibration. Replace worn components promptly to avoid false readings. The aluminum body with 304 stainless steel sleeve resists corrosion, but in aggressive environments, periodic cleaning is recommended.
Selection Guide & Purchasing Advice
Before purchasing, verify that the 21000-16-05-15-093-03-02 meets your specific requirements. Check the probe cable length, standoff adapter size, and probe penetration to ensure compatibility with your machinery. The 3/4-14 NPT mounting thread is standard, but confirm it matches your installation point.
For assistance in selecting the right housing assembly, PLC Source PRO offers expert guidance and genuine Bently Nevada parts. Each unit is new and in original factory packing, with a 12-month warranty, ensuring you receive a reliable component for your control system.