21000-34-05-20-066-03-02 | Bently Nevada 0.5 m Cable Proximity Probe Housing Assembly

Solving Challenging Vibration Monitoring with the Bently Nevada 21000-34-05-20-066-03-02

When engineers need to monitor shaft vibration in hazardous areas, they require a robust housing that protects the probe and meets strict safety standards. The 21000-34-05-20-066-03-02 from Bently Nevada delivers exactly that. This Proximity Probe Housing Assembly combines an aluminum body with a 304 stainless steel sleeve, ensuring durability in harsh industrial environments. With a 0.5 m (20 in) probe cable and a 6.6 in probe penetration, it fits tight installations where precise measurement is critical. The assembly includes a 3/4-14 NPT mounting thread and a standoff adapter of 2.0, making it versatile for various machine train configurations.

Key Features and Technical Specs of the 21000-34-05-20-066-03-02

• Probe Option: 3300 XL 8 mm probe with connector protector for selectable hazardous area approvals.
• Probe Cable Length: 0.5 m (20 in) for flexible routing.
• Standoff Adapter: 2.0 length for precise gap setting.
• Probe Penetration: 6.6 in to accommodate thick machine casings.
• Fitting Option: Includes one 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, and a cable seal grip with grommets for cable sizes from 1/8 to 3/8 inches.
• Mounting Thread: 3/4-14 NPT for standard conduit connections.
• Material: Aluminum body with 304 stainless steel sleeve for corrosion resistance.
• Weight: 1.1 kg (2.4 lb) typical, without fittings.
• Maximum (C) + (D) Dimension: 13.5 in (34.3 cm) with visible probe P/N and S/N not visible.

One distinctive spec is the 2.0 standoff adapter, which allows precise axial positioning of the probe relative to the shaft. This ensures accurate gap voltage settings and reliable vibration data collection.

Real-World Applications for the 21000-34-05-20-066-03-02

This housing assembly is ideal for monitoring radial vibration and thrust position on compressors, turbines, pumps, and electric motors in refineries, chemical plants, and power generation facilities. Because it is CSA certified as a Type 4 enclosure and meets API 670 standards, it suits both non-hazardous and hazardous area installations. The 0.5 m probe cable simplifies wiring in confined spaces, while the 6.6 in penetration reaches through thick bearing housings.

Installation Guide for the Bently Nevada Proximity Probe Housing Assembly

Mount the housing using the 3/4-14 NPT thread into a pre-drilled hole in the machine casing. Adjust the standoff adapter to achieve the desired probe gap. Use the included cable seal grip to secure the probe cable and maintain environmental sealing. For hazardous area installations, follow the specific approval requirements. Ensure the probe tip is clean and properly aligned with the target surface.

Maintenance and Reliability Tips

Periodically inspect the O-rings and thread seal for wear or damage. Check the cable seal grip for tightness to prevent moisture ingress. Verify that the dome cover screws securely into the body. In corrosive environments, the 304 stainless steel sleeve provides long-term resistance. Regular inspection per the manufacturer's manual ensures reliable operation.

Compatibility and Integration

The 21000-34-05-20-066-03-02 is designed for use with Bently Nevada 3300 XL 8 mm proximity probes. It integrates seamlessly with Bently Nevada monitoring systems such as the 3500 Series. The 3/4-14 NPT fitting allows connection to standard conduit and junction boxes. The assembly is fully compliant with API 670 for externally mounted proximity probe housings.

FAQ about the 21000-34-05-20-066-03-02

Q: What is the probe cable length of the 21000-34-05-20-066-03-02?

A: The probe cable length is 0.5 m (20 in).

Q: What is the probe penetration depth of this housing assembly?

A: The probe penetration is 6.6 in.

Q: What mounting thread option is used?

A: The mounting thread option is 3/4-14 NPT.

Q: Is the 21000-34-05-20-066-03-02 suitable for hazardous areas?

A: Yes, it is available with CSA approvals for hazardous areas and is rated explosion proof.

Q: What materials are used in the housing?

A: The body is aluminum, and the sleeve is 304 stainless steel.

Product Support and Availability

The 21000-34-05-20-066-03-02 is in stock and ready to ship from Petro Auto Tech. It comes as new and original in factory packing with a 12-month factory warranty. Contact Petro Auto Tech for current lifecycle status and availability.