Product Overview
When rotating machinery reliability is non-negotiable, the Bently Nevada 21000-34-00-15-050-04-02 delivers a robust mounting solution for proximity probes. This industrial automation module is part of the 21000 series of Proximity Probe Housing Assemblies, engineered to protect and position a 3300 XL 8 mm probe in demanding environments. The housing combines an aluminum body with a 304 stainless steel sleeve, providing durability and corrosion resistance. With CSA Type 4 enclosure certification and API 670 compliance, this unit is built for hazardous-area service.
Technical Specifications
The 21000-34-00-15-050-04-02 comes with precise configuration options that define its performance. Below are the key specifications:
| Specification |
Detail |
| Probe Option |
3300 XL 8 mm probe with connector protector, selectable hazardous area approvals |
| Probe Cable Length |
Probe cable not required (00) |
| Standoff Adapter |
1.5 in (15) |
| Probe Penetration |
5 in (050) |
| Fitting Option |
One 3/4-14 NPT plug only (04) |
| Mounting Thread |
3/4-14 NPT (-02) – required when standoff adapter length is not -00 |
| Material |
Aluminum body with 304 stainless steel sleeve |
| Probe Cable Length |
1.0 m |
| 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) |
These specifications ensure that the 21000-34-00-15-050-04-02 meets the exact requirements for external mounting of proximity probes in industrial rotating equipment.
Industry Applications
The 21000-34-00-15-050-04-02 is designed for vibration and displacement monitoring in critical machinery. Typical applications include:
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Turbo-machinery: Compressors, turbines, and pumps where shaft vibration must be continuously monitored.
-
Generators: Large electric generators that require reliable proximity probe mounting for bearing and shaft position sensing.
-
Hazardous environments: Facilities with explosive atmospheres where the CSA explosion-proof rating is essential.
Because it is fully compliant with API 670, this housing is a preferred choice for refineries and petrochemical plants that must adhere to international standards.
Installation & Setup
Proper installation is critical to ensure accurate readings. The 21000-34-00-15-050-04-02 includes a dome cover, threaded ports for conduit connections, a probe sleeve, O-rings, a reverse mount proximity probe, and a thread seal. Follow these guidelines:
- Mount the housing securely using the 3/4-14 NPT mounting thread. Ensure the standoff adapter (1.5 in) is properly seated.
- Route the probe cable (1.0 m) through the conduit ports, avoiding sharp bends that could damage the cable.
- Verify the probe penetration (5 in) matches the machine’s internal clearance. The maximum dimensions (C)+(D) must be respected to avoid interference.
- Check that all O-rings are intact and the dome cover is tightened to maintain the enclosure’s explosion-proof rating.
Maintenance & Reliability
Regular inspection of the 21000-34-00-15-050-04-02 ensures long-term reliability. Because the housing protects the probe in harsh conditions, periodic checks should include:
- Visual inspection for corrosion or physical damage, especially on the aluminum body and stainless steel sleeve.
- Verification that the dome cover and conduit fittings remain tight to preserve the CSA Type 4 rating.
- Confirmation that the probe cable is not chafed or pinched, which could lead to signal loss.
By following a routine maintenance schedule, you minimize unplanned downtime and extend the service life of both the housing and the probe.
Selection Guide & Purchasing Advice
When ordering the 21000-34-00-15-050-04-02, verify that the suffix codes match your application requirements. The probe cable is not required (00), so you must supply a compatible cable if needed. The fitting option includes one 3/4-14 NPT plug, which may be used to seal an unused port. Ensure the mounting thread option (-02) is selected, as it is mandatory unless the standoff adapter length is -00. For a seamless procurement experience, PLC Source PRO offers this unit as new and original in factory packing, backed by a 12-month warranty.