21000-34-00-20-018-03-02 | Bently Nevada 1.8 in Probe Housing Assembly

What Is the 21000-34-00-20-018-03-02?

When machinery protection demands robust vibration monitoring, the 21000-34-00-20-018-03-02 from Bently Nevada delivers a durable proximity probe housing assembly. This model features a 2.0 in standoff adapter and 1.8 in probe penetration, engineered for hazardous area applications. Part of the 21000 series, it combines an aluminum body with a 304 stainless steel sleeve for long-lasting performance.

Key Features & Technical Specs

• Probe Option: 3300 XL 8 mm probe with connector protector and selectable hazardous area approvals.
• Standoff Adapter: 2.0 in length for precise positioning.
• Probe Penetration: 1.8 in for accurate gap measurement.
• 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 required when standoff adapter length is not -00.
• Material: Aluminum body with 304 stainless steel sleeve for corrosion resistance.
• Probe Cable Length: 1.0 m for flexible installation.
• Weight: 1.1 kg (2.4 lb) typical, without fittings.
• Maximum (C) + (D) Dimension: 32.9 in (83.5 cm) for overall assembly length.

A standout spec is the 1.8 in probe penetration, which ensures consistent proximity sensing in tight turbine or compressor installations. This precision reduces measurement errors and supports reliable machine health monitoring.

Applications & Use Cases

In oil and gas refineries, the 21000-34-00-20-018-03-02 monitors shaft vibration and position on rotating equipment. For chemical plants, its CSA Type 4 enclosure and explosion-proof rating suit hazardous environments. Additionally, power generation facilities benefit from its API 670 compliance for externally mounted proximity probes. Consequently, this housing assembly helps prevent unplanned downtime by delivering accurate data for predictive maintenance.

Installation Guide

Mount the housing using the 3/4-14 NPT thread option for secure attachment. First, select the appropriate cable seal grip grommet based on your cable diameter (1/8 to 3/16, 1/4 to 5/16, or 5/16 to 3/8 inches). Then, install the standoff adapter to achieve the 2.0 in offset. Ensure the probe sleeve penetrates 1.8 in into the housing for correct gap setting. Finally, tighten the dome cover and conduit fittings to maintain the explosion-proof seal. Always follow Bently Nevada guidelines for wiring and grounding to avoid signal noise.

Maintenance & Reliability

Regular inspection of the O-rings and thread seal helps maintain the housing’s environmental integrity. Because the assembly is rated explosion proof, verify that all fittings remain tight after installation. The aluminum body and stainless steel sleeve resist corrosion, extending service life in harsh conditions. As a result, the 21000-34-00-20-018-03-02 reduces lifecycle costs by minimizing replacement frequency.

Compatibility & Integration

This housing works with Bently Nevada 3300 XL 8 mm proximity probes and is designed for use with compatible monitoring systems. Its CSA Type 4 enclosure and API 670 compliance ensure seamless integration into existing vibration monitoring networks. For best results, pair with Bently Nevada signal conditioners and cables that match the 1.0 m probe cable length.

FAQs about 21000-34-00-20-018-03-02

Q: What probe cable length is included with the 21000-34-00-20-018-03-02?

A: The probe cable length is 1.0 m, as specified in the ordering data.

Q: What is the maximum overall dimension of this housing assembly?

A: The maximum (C) + (D) dimension is 32.9 in (83.5 cm).

Q: Is the 21000-34-00-20-018-03-02 suitable for hazardous areas?

A: Yes, it is rated explosion proof for hazardous areas and has CSA Type 4 enclosure certification.

Q: What mounting thread does this model require?

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

Support & Availability

The 21000-34-00-20-018-03-02 is in stock and ready to ship from Petro Auto Tech. Contact our team for ordering assistance or technical questions. We provide fast delivery and factory warranty support.