21000-34-10-20-018-04-02 | Bently Nevada 8 mm Proximity Probe Housing Assembly

Introduction to the 21000-34-10-20-018-04-02

When you need a rugged, explosion-proof housing for proximity probes in hazardous areas, the 21000-34-10-20-018-04-02 from Bently Nevada delivers. This assembly integrates a 3300 XL 8 mm probe with a connector protector, a 1.0 m (39 in) probe cable, and a 2.0 in standoff adapter. It supports selectable hazardous area approvals and is rated as a CSA Type 4 enclosure. Designed for externally mounted proximity probes, it fully complies with API 670 standards.

Key Features & Technical Specs

• Probe Option: 3300 XL 8 mm probe with connector protector and selectable hazardous area approvals.
• Probe Cable Length: 1.0 m (39 in) — provides flexibility for installation in confined spaces.
• Standoff Adapter: 2.0 in — ensures proper probe positioning relative to the target.
• Probe Penetration: 1.8 in — defines how far the probe extends into the housing.
• Fitting Option: One 3/4-14 NPT plug only — simplifies conduit connections.
• Mounting Thread: 3/4-14 NPT — must be ordered when standoff adapter is not -00.
• Material: Aluminum body with 304 stainless steel sleeve — resists corrosion and mechanical stress.
• Weight: 1.1 kg (2.4 lb) typical, without fittings — lightweight for easy handling.
• Maximum Dimensions: (C)+(D) with visible probe P/N and S/N: 17.0 in (43.18 cm); overall maximum: 32.9 in (83.5 cm).
• CSA Approvals: Explosion-proof for hazardous areas; CSA Type 4 enclosure rating.

One distinctive spec is the 8 mm probe size, which offers high sensitivity for detecting shaft vibrations in rotating machinery. This makes the 21000-34-10-20-018-04-02 ideal for critical asset protection.

Applications & Use Cases

In the oil and gas industry, the 21000-34-10-20-018-04-02 is used to monitor compressor and turbine vibrations in hazardous zones. For power generation, it provides reliable data for balancing and alignment checks. Its CSA explosion-proof rating ensures safe operation in environments with flammable gases. Additionally, the API 670 compliance makes it a preferred choice for refinery and petrochemical plants.

Installation & Setup

Mount the housing using the 3/4-14 NPT thread option to secure it to a conduit or bracket. The 1.0 m probe cable allows routing through standard conduit fittings. Use the supplied 3/4-14 NPT plug for unused ports to maintain enclosure integrity. Ensure the standoff adapter is set to 2.0 in for proper probe gap. Always follow Bently Nevada’s installation manual for torque specifications and wiring.

Maintenance & Reliability

Periodically inspect the O-rings and thread seal for wear to maintain the explosion-proof seal. Check the probe cable for cuts or abrasions, especially near the connector. The aluminum body and stainless steel sleeve resist corrosion in harsh environments. Regular calibration checks every 12 months help sustain measurement accuracy. By following these steps, you extend service life and reduce unplanned downtime.

Compatibility & Integration

The 21000-34-10-20-018-04-02 works with Bently Nevada monitoring systems that accept 8 mm proximity probes. It integrates with 3500 series racks and other vibration monitoring platforms. The CSA Type 4 enclosure allows use in washdown areas. For intrinsically safe applications, pair with approved barriers. No special software is required for mechanical installation.

Troubleshooting & Common Issues

If you experience erratic readings, check the probe cable for damage or loose connections. A missing or worn O-ring can compromise the explosion-proof rating. Verify that the standoff adapter is set to 2.0 in, as incorrect penetration affects linearity. If the housing leaks, inspect the thread seal and tighten the dome cover. For persistent issues, consult the Bently Nevada troubleshooting guide.

FAQ about 21000-34-10-20-018-04-02

Q: What is the probe cable length on the 21000-34-10-20-018-04-02?

A: The probe cable length is 1.0 m (39 in).

Q: Is this housing rated for hazardous areas?

A: Yes, it is CSA explosion-proof rated and available with selectable hazardous area approvals. Only CA versions are explosion-proof by CSA when ordered with specific options.

Q: What mounting thread does the 21000-34-10-20-018-04-02 use?

A: It uses a 3/4-14 NPT mounting thread, which must be ordered if the standoff adapter length is not -00.

Q: What material is the housing made of?

A: The body is aluminum with a 304 stainless steel sleeve.

Q: What is the weight of this assembly?

A: It weighs 1.1 kg (2.4 lb) typical, without fittings.

Product Support & Availability

The 21000-34-10-20-018-04-02 is in stock and ready to ship from Petro Auto Tech. We provide new, original factory-packed units with a 12-month warranty. Contact our team for pricing and delivery options.