Product Overview
The Bently Nevada 21000-34-00-20-095-04-02 is a precision-engineered proximity probe housing assembly designed for reliable vibration monitoring in critical rotating machinery. Part of the 21000 series, this aluminum housing with a 304 stainless steel sleeve protects the probe in demanding industrial environments. It is certified as a CSA Type 4 enclosure and fully compliant with the American Petroleum Institute's (API) 670 Standard for externally mounted proximity probe housings, making it a trusted choice for machinery protection systems.
Technical Specifications
The following specifications are directly from the manufacturer for the 21000-34-00-20-095-04-02 model:
| Parameter |
Value |
| Probe Option |
3300 XL 8 mm probe with connector protector, selectable hazardous area approvals |
| Probe Cable Length |
Not required (00) |
| Standoff Adapter |
2.0 in (20) |
| Probe Penetration |
9.5 in (095) |
| Fitting Option |
One 3/4-14 NPT plug only (04) |
| Mounting Thread |
3/4-14 NPT (-02) |
| Housing 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) |
Key Features & Benefits
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Explosion-proof rating for hazardous areas, ensuring safe operation in potentially explosive atmospheres.
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CSA Type 4 enclosure certification guarantees protection against water splashes and dust ingress.
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API 670 compliance ensures the housing meets industry standards for externally mounted proximity probes.
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Aluminum body with 304 stainless steel sleeve offers a balance of lightweight design and corrosion resistance.
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Optional standoff adapter (2.0 in) allows flexible mounting configurations.
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Threaded ports for conduit connections simplify wiring and provide secure cable entry.
Industry Applications
This Bently Nevada 21000-34-00-20-095-04-02 housing is ideal for use in industries where continuous vibration monitoring is essential. Common applications include:
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Oil & Gas: Monitoring compressors, pumps, and turbines in refineries and processing plants.
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Power Generation: Protecting steam turbines, gas turbines, and generators from excessive vibration.
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Manufacturing: Ensuring the reliability of large rotating equipment like paper machines and rolling mills.
By maintaining precise clearance between the probe and the shaft, this housing helps prevent catastrophic failures and unplanned downtime, directly contributing to operational efficiency.
Installation & Setup Guidance
Proper installation is critical for accurate vibration measurement. Follow these guidelines:
- Mount the housing securely using the 3/4-14 NPT thread, ensuring the probe is positioned perpendicular to the shaft surface.
- Adjust the standoff adapter to achieve the recommended gap between the probe tip and the shaft (typically within the linear range of the probe).
- Route the probe cable through the conduit ports, avoiding sharp bends and excessive strain.
- Verify the probe penetration depth (9.5 in) to ensure optimal sensing area coverage.
- Use the provided NPT plug to seal unused ports, maintaining the enclosure's integrity.
Maintenance & Reliability
Routine inspection of the probe housing is essential for long-term reliability. Check the O-rings and thread seals periodically for wear and replace them if damaged. Keep the exterior clean to prevent buildup that could compromise the seal. With proper care, this housing provides extended service life, reducing total cost of ownership. The stainless steel sleeve resists corrosion, while the aluminum body offers lightweight durability—minimizing maintenance frequency and downtime.
Selection Guide & Purchasing Advice
Before ordering the 21000-34-00-20-095-04-02, verify that your existing system requires a 3300 XL 8 mm probe and that the mounting thread (3/4-14 NPT) matches your installation. If your application requires a different standoff adapter or penetration depth, please review other suffix options in the 21000 series. For a reliable supply of genuine Bently Nevada parts, PLC Source PRO offers this model new in factory packing with a 12-month warranty. Ensure you have the correct probe and cable length to complete your setup.