Product Overview
When you need reliable vibration monitoring in demanding rotating machinery, the Bently Nevada 21000-16-05-00-105-03-02 delivers a robust solution. This industrial automation module is a proximity probe housing assembly designed to protect and position a reverse mount proximity probe for accurate shaft displacement measurements. Built with an aluminum body and a 304 stainless steel sleeve, it offers durability in harsh environments.
The 21000-16-05-00-105-03-02 comes as a new, original unit in factory packing, backed by a 12-month factory warranty. It includes a 3300 XL 8 mm probe with a 0.5 m (20 in) cable, a 3/4-14 NPT mounting thread, and a complete set of fittings for conduit connections. With CSA Type 4 enclosure certification and API 670 compliance, this housing assembly is engineered for explosion-proof hazardous area applications.
Key Specifications
Every technical detail of the 21000-16-05-00-105-03-02 is precisely engineered to meet industrial standards. Below are the critical parameters:
| Specification |
Value |
| Probe Option |
16 – 3300 XL 8 mm probe |
| Probe Cable Length |
05 – 0.5 m (20 in) |
| Standoff Adapter |
00 – None |
| Probe Penetration (Option D) |
105 – 10.5 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 1/8–3/16 in, 1/4–5/16 in, 5/16–3/8 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 probe cable |
| Weight (typical, without fittings) |
1.1 kg (2.4 lb) |
The housing assembly includes a dome cover, threaded ports for conduit connections, an optional-length probe sleeve, O-rings, a reverse mount proximity probe, a thread seal, and optional conduit fittings. The standoff adapter is optional and not included in this configuration.
Industry Applications
The 21000-16-05-00-105-03-02 is ideal for monitoring shaft vibration and axial position in turbines, compressors, pumps, and other rotating equipment. Its explosion-proof certification makes it suitable for hazardous areas such as oil refineries, chemical plants, and gas processing facilities.
In a typical application, the housing is mounted externally on the machine case, and the probe sleeve penetrates to the desired depth. The 10.5 in probe penetration allows flexible positioning while maintaining measurement accuracy. The 0.5 m cable length is perfect for short runs to the junction box.
Because the assembly is fully compliant with API 670, you can trust it to meet the stringent requirements of the petroleum and petrochemical industries. This module is a dependable choice for upgrading older vibration monitoring systems that require robust, certified housings.
Installation & Setup Guidance
Proper installation is crucial for accurate readings. Follow these steps for best results:
- Select a mounting location that provides a clear line of sight to the target shaft surface. Ensure the probe tip is perpendicular to the shaft.
- Use the 3/4-14 NPT thread to secure the housing into the machine case. If the probe penetration length (C plus D) is between 1.0 and 2.0 inches, counter boring may be necessary to reduce side view or rear view effects.
- For probe penetration lengths exceeding 300 mm (12 in), add sleeve support near the probe to prevent resonance.
- Route the probe cable through the cable seal grip, selecting the appropriate grommet size from the provided range (1/8 to 3/8 inches).
- Connect the probe to the extension cable and monitor as per your system's wiring diagram.
Adjust the probe penetration (Option D) within the 13 mm (±0.5 in) range to achieve the optimal gap voltage. Always verify that the probe tip does not contact the shaft during operation.
Maintenance & Reliability
Routine inspection ensures long-term performance. Check the housing for any signs of corrosion or damage, especially in corrosive atmospheres. The aluminum body with 304 stainless steel sleeve provides excellent resistance, but regular cleaning is recommended.
Inspect the cable seal grip and grommets periodically to maintain a watertight seal. Replace worn grommets to prevent moisture ingress. Verify that all fittings remain tight to avoid loosening due to vibration.
The housing is rated for temperatures up to +80 °C (T4 rating) and down to -50 °C, making it suitable for extreme environments. With proper care, this module will provide years of reliable service, reducing downtime and maintenance costs.
Selection Guide & Purchasing Advice
Before ordering, confirm that the 21000-16-05-00-105-03-02 matches your system requirements. Check the probe cable length, penetration dimension, and mounting thread compatibility with your existing setup. If you need a different probe option or cable length, Bently Nevada offers a wide range of configurations—contact our team for assistance.
This product is new, in original factory packing, and covered by a 12-month warranty. PLC Source PRO ensures fast delivery and reliable support for all your industrial automation needs. For bulk orders or custom configurations, please reach out to our sales department.