21000-34-00-30-018-03-02 | Bently Nevada 8 mm Probe Housing Assembly

Introduction to the 21000-34-00-30-018-03-02

When reliable vibration monitoring is critical for rotating machinery, the 21000-34-00-30-018-03-02 from Bently Nevada provides a robust solution. This proximity probe housing assembly is part of the 21000 series, designed for externally mounted probes in hazardous areas. It features an aluminum body with a 304 stainless steel sleeve, ensuring durability in demanding industrial environments. With a typical weight of 1.1 kg (2.4 lb) without fittings, this assembly is built for long-term performance.

Key Features and Technical Specs of the 21000-34-00-30-018-03-02

• Probe Option: 3300 XL 8 mm probe with connector protector, selectable hazardous area approvals
• Standoff Adapter: 3.0 inches (30 suffix code)
• Probe Penetration: 1.8 inches (018 suffix code)
• Mounting Thread: 3/4-14 NPT (option -02)
• Fittings Included: One 3/4-14 NPT plug, one 3/4-14 to 1/2-14 NPT reducer, and a cable seal grip with grommets for cables from 1/8 to 3/8 inches
• Material: Aluminum body with 304 stainless steel sleeve
• Weight: 1.1 kg (2.4 lb) typical, without fittings

A standout feature is the 3.0-inch standoff adapter, which allows precise positioning of the probe relative to the target surface. This configuration helps maintain consistent gap settings, reducing measurement errors in critical applications.

Applications and Use Cases

In industries such as oil and gas, power generation, and petrochemical, the 21000-34-00-30-018-03-02 is commonly used for monitoring shaft vibration and position in turbines, compressors, and pumps. Its CSA Type 4 enclosure rating and explosion-proof certification make it suitable for hazardous areas. For example, in a refinery, this housing assembly can be installed on a centrifugal compressor to provide continuous vibration data, helping prevent unplanned downtime.

Installation and Setup

Mounting the 21000-34-00-30-018-03-02 requires a 3/4-14 NPT threaded port. The included fittings allow flexible conduit connections: the 3/4-14 NPT plug seals unused ports, while the reducer adapts to 1/2-14 NPT. The cable seal grip accommodates cable diameters from 1/8 to 3/8 inches, ensuring a secure environmental seal. Always follow the manufacturer's manual for proper torque and alignment to avoid probe damage.

Maintenance and Reliability

To maximize service life, inspect the O-rings and thread seal periodically for wear or contamination. The aluminum body and stainless steel sleeve resist corrosion, but regular cleaning with a dry cloth is recommended. Because this assembly is used in safety-critical applications, verify all connections and seals during routine maintenance. Following these practices helps extend the operational life of the 21000-34-00-30-018-03-02 and reduces replacement costs.

Frequently Asked Questions about the 21000-34-00-30-018-03-02

Q: What is the probe cable length for the 21000-34-00-30-018-03-02?

A: The suffix code 00 indicates that a probe cable is not required for this assembly.

Q: What is the standoff adapter length for this model?

A: The standoff adapter length is 3.0 inches, as indicated by the 30 suffix code.

Q: What mounting thread option is used?

A: The mounting thread is 3/4-14 NPT, specified by the -02 suffix code.

Q: Is the 21000-34-00-30-018-03-02 suitable for hazardous areas?

A: Yes, it is rated explosion proof and CSA Type 4, with selectable hazardous area approvals for the probe.

Q: What materials are used in the housing?

A: The housing has an aluminum body with a 304 stainless steel sleeve.

Product Support and Availability

The 21000-34-00-30-018-03-02 is available as a new, original factory-packed unit from Petro Auto Tech. It comes with a 12-month factory warranty. For lifecycle status or technical documentation, please contact Petro Auto Tech before ordering.