Product Overview
When machinery protection demands reliable vibration monitoring in hazardous environments, the Bently Nevada 21000-28-05-35-020-04-02 Proximity Probe Housing Assembly delivers a robust solution. This industrial automation module houses a 3300 XL 8 mm proximity probe, providing a secure, explosion-proof enclosure for continuous rotor vibration and position measurement in critical rotating equipment.
Designed for external mounting, the 21000-28-05-35-020-04-02 combines a lightweight aluminum body with a 304 stainless steel sleeve, ensuring durability without adding excessive weight. It is certified as a CSA Type 4 enclosure and fully complies with the American Petroleum Institute's API 670 standard for externally mounted proximity probe housings.
Key Features & Benefits
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Explosion-proof certification: CSA certified for Class I Divisions 1 and 2 Groups C and D, Class II Divisions 1 and 2 Groups E, F, and G, and Class III. Temperature ratings T5 @ Ta = -50°C to +40°C and T4 @ Ta = -50°C to +80°C.
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Non-incendive circuit: When connected per drawing 140979, the circuit is non-incendive, enhancing safety in intrinsically safe applications.
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API 670 compliance: Meets industry standard for externally mounted proximity probe housings, ensuring reliable performance in petroleum and chemical plants.
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Material quality: Aluminum body with 304 stainless steel sleeve offers corrosion resistance and structural integrity.
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Selectable probe options: Supports 3300 XL 8 mm probes with selectable hazardous area approvals.
Technical Specifications
This Bently Nevada 21000-28-05-35-020-04-02 unit includes the following configuration:
| Specification |
Detail |
| Probe Option |
28: 3300 XL 8 mm probe, selectable hazardous area approvals |
| Probe Cable Length |
05: 0.5 m (20 in) |
| Standoff Adapter |
35: 3.5 in |
| Probe Penetration |
020: 2 in |
| Fitting Option |
04: One 3/4-14 NPT plug only |
| Mounting Thread Option |
02: 3/4-14 NPT (required when standoff adapter length is not 00) |
| Material |
Aluminum body with 304 stainless steel sleeve |
| Maximum (C) + (D) Dimension |
13.5 in (34.3 mm) with 0.5 m probe cable (probe P/N and S/N not visible) |
| Weight |
1.1 kg (2.4 lb) typical, without fittings |
Industry Applications
This housing assembly is ideal for monitoring vibration and position in turbomachinery, compressors, pumps, and motors. In petrochemical facilities, the explosion-proof rating ensures safe operation in classified areas. For example, a refinery using this Bently Nevada 21000-28-05-35-020-04-02 can reliably monitor shaft vibration on a critical compressor, preventing unplanned downtime.
The API 670 compliance makes it suitable for applications where external mounting is required, such as on bearing housings. Its compact design and 3/4-14 NPT mounting thread allow for straightforward integration into existing machinery.
Installation & Setup Guidance
When installing the Bently Nevada 21000-28-05-35-020-04-02, follow these steps:
- Verify the mounting thread (3/4-14 NPT) matches the machine's port.
- Ensure the probe cable length (0.5 m) is sufficient for routing to the monitor.
- Position the probe so that the penetration depth (2 in) is correctly set for optimal measurement.
- Secure the housing using the provided NPT plug and fittings.
Always consult the machine's installation manual for specific torque requirements and clearance considerations.
Maintenance & Reliability
Regular inspection of the housing and probe is essential for long-term reliability. Check for any signs of corrosion or damage to the aluminum body and stainless steel sleeve. Verify that all fittings remain tight and that the probe cable is not abraded. The CSA Type 4 enclosure rating protects against water and dust ingress, reducing maintenance frequency in harsh environments.
Selection & Purchasing Advice
Before ordering, confirm that the probe option, cable length, and standoff adapter match your application requirements. This Bently Nevada 21000-28-05-35-020-04-02 is a new, original factory-packed unit with a 12-month warranty. For additional configurations or assistance, PLC Source PRO provides reliable sourcing for industrial automation parts.