21000-34-05-20-065-03-02 | Bently Nevada 8 mm Probe Housing Assembly

What Is the 21000-34-05-20-065-03-02?

When machinery vibration threatens uptime, the 21000-34-05-20-065-03-02 from Bently Nevada provides a robust solution. This proximity probe housing assembly integrates an 8 mm probe with a 0.5 m cable and a 2.0 in standoff adapter. It is designed for hazardous areas with CSA explosion-proof certification. Engineers rely on this unit for accurate, continuous monitoring in demanding industrial environments.

Key Features & Technical Specs

• Probe Option: 3300 XL 8 mm probe with connector protector and selectable hazardous area approvals.
• Probe Cable Length: 0.5 m (20 in) for flexible installation.
• Standoff Adapter: 2.0 in length ensures proper probe positioning.
• Probe Penetration: 6.5 in for deep measurement access.
• Fitting Option: Includes one 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, and cable seal grip with grommets for cable sizes from 1/8 to 3/8 inches.
• Mounting Thread: 3/4-14 NPT for secure attachment.
• Material: Aluminum body with 304 stainless steel sleeve for durability.
• Weight: 1.1 kg (2.4 lb) typical, without fittings.
• Maximum (C) + (D) Dimension: 13.5 in (34.3 cm) with probe P/N and S/N not visible.

A standout specification is the 8 mm probe size, which delivers high-resolution vibration data for early fault detection. This precision helps prevent unplanned downtime.

Industry Applications

In rotating machinery like pumps, compressors, and turbines, the 21000-34-05-20-065-03-02 excels. It is fully compliant with API 670 Standard for externally mounted proximity probe housings. For example, in a refinery, this housing assembly withstands harsh conditions while providing reliable shaft vibration and position measurements. Its CSA Type 4 enclosure rating ensures protection against dust and water ingress.

Installation & Setup

Mount the housing using the 3/4-14 NPT thread option. Ensure the standoff adapter length matches your application—2.0 in is standard. Connect the probe cable through the cable seal grip, selecting the correct grommet for your cable diameter (1/8 to 3/8 inches). Tighten the dome cover securely to maintain the explosion-proof seal. Always follow the manufacturer’s manual for torque specifications.

Routine Care & Reliability

Inspect the housing periodically for signs of wear or corrosion, especially in corrosive environments. The aluminum body with stainless steel sleeve offers long service life. Verify that O-rings and thread seals remain intact to preserve the hazardous area rating. Regular inspection reduces the risk of false readings and extends equipment life.

Compatibility & Integration

This housing assembly works with Bently Nevada monitoring systems that accept 8 mm proximity probes. It integrates seamlessly with vibration monitoring racks and data acquisition units. The CSA approval ensures compatibility with intrinsically safe barriers for hazardous locations. For specific system compatibility, consult the official Bently Nevada documentation.

Common Questions About the 21000-34-05-20-065-03-02

Q: What is the probe cable length on this model?

A: The probe cable length is 0.5 m (20 in), as specified in the ordering information.

Q: Is this housing assembly explosion-proof?

A: Yes, when ordered with the correct options (E:00, E:01, E:02, or E:04), the CA version of the housing is rated explosion-proof by CSA.

Q: What materials are used in the construction?

A: The housing has an aluminum body with a 304 stainless steel sleeve, providing corrosion resistance and strength.

Q: What mounting thread does this unit require?

A: It requires a 3/4-14 NPT mounting thread, which is mandatory when the standoff adapter length option is not -00.

Q: What is the typical weight without fittings?

A: The typical weight is 1.1 kg (2.4 lb) without fittings.

Product Support & Availability

The 21000-34-05-20-065-03-02 is in stock and ready to ship from Petro Auto Tech. As a new and original factory-packed unit, it comes with a 12-month warranty. Contact Petro Auto Tech for lifecycle status and ordering details.