Product Overview
The Bently Nevada 21000-34-00-20-030-03-02 is an industrial automation module designed as a rugged proximity probe housing assembly for permanent vibration monitoring in rotating machinery. This model combines a 2.0-inch standoff adapter with 3.0-inch probe penetration, providing precise, repeatable mounting for the 3300 XL 8 mm probe. Built to withstand harsh environments, the housing features an aluminum body with a 304 stainless steel sleeve, ensuring long-term durability in demanding applications.
Technical Specifications
The 21000-34-00-20-030-03-02 comes with a clear set of specifications that define its performance and compatibility. Below are the key parameters:
| Parameter |
Value |
| Probe Option |
3300 XL 8 mm probe with connector protector |
| Probe Cable Length |
Not required (00) |
| Standoff Adapter |
2.0 in (20) |
| Probe Penetration |
3.0 in (030) |
| Fitting Option |
One 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, one cable seal grip with grommets for various cable sizes |
| Mounting Thread |
3/4-14 NPT (-02) |
| 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 rated for hazardous areas, ensuring safe operation in explosive environments.
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CSA Type 4 enclosure certification provides protection against dust, oil, and water ingress.
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Fully compliant with API 670 Standard for externally mounted proximity probe housings, guaranteeing industry-accepted performance.
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Versatile fitting options accommodate various cable sizes (1/8 to 3/16 in, 1/4 to 5/16 in, 5/16 to 3/8 in) for flexible installation.
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Aluminum body with 304 stainless steel sleeve offers corrosion resistance and mechanical strength.
Industry Applications
The 21000-34-00-20-030-03-02 is ideal for vibration monitoring on critical rotating equipment such as turbines, compressors, pumps, and motors. In petrochemical plants, its explosion-proof design allows safe installation in classified areas. In power generation facilities, the housing's API 670 compliance ensures reliable shaft vibration measurement, helping to prevent unplanned downtime. Its robust construction also suits offshore and marine applications where corrosion resistance is paramount.
Installation & Setup Guidance
When installing the 21000-34-00-20-030-03-02, ensure the mounting thread (3/4-14 NPT) is clean and free of debris. Use the provided standoff adapter to achieve the correct probe gap. For optimal performance, follow the recommended torque values for the NPT connections and verify the probe tip gap using the calibration procedure. The housing includes a dome cover that screws into the body; ensure it is properly seated to maintain the enclosure rating. For conduit connections, use the threaded ports provided and install the cable seal grip to maintain moisture resistance.
Maintenance & Reliability
Routine inspection of the housing should focus on the integrity of the O-rings and the thread seal to prevent moisture ingress. Check the cable seal grip periodically for signs of wear or cracking. In corrosive environments, inspect the aluminum body and stainless steel sleeve for pitting or damage. The housing's robust design minimizes maintenance needs, reducing lifecycle costs and improving overall reliability.
Selection Guide & Purchasing Advice
Before ordering, verify that the probe cable length and standoff adapter dimensions match your installation requirements. The 21000-34-00-20-030-03-02 is supplied new and in original factory packing, backed by a 12-month warranty. For additional support or to confirm compatibility with your existing monitoring system, contact PLC Source PRO.