21000-34-00-00-028-04-02 | Bently Nevada 8 mm Probe Housing Assembly

Introduction to the Bently Nevada 21000-34-00-00-028-04-02

When reliable vibration monitoring in hazardous environments is critical, the 21000-34-00-00-028-04-02 from Bently Nevada delivers a robust solution. This proximity probe housing assembly is part of the trusted 21000 series, engineered for externally mounted probes in industrial settings. It combines an aluminum body with a 304 stainless steel sleeve for durability in harsh conditions.

The assembly supports a 3300 XL 8 mm probe with a connector protector, selectable for hazardous area approvals. With a probe penetration of 2.8 inches and a 3/4-14 NPT mounting thread, it fits standard conduit connections. This model also includes one 3/4-14 NPT plug for sealing unused ports.

Key Features & Technical Specifications of the 21000-34-00-00-028-04-02

• Probe Option: 3300 XL 8 mm probe with connector protector, selectable hazardous area approvals.
• Probe Cable Length: 1.0 meter (probe cable not required with this suffix).
• Probe Penetration: 2.8 inches (028 suffix).
• Fitting Option: One 3/4-14 NPT plug only (04 suffix).
• Mounting Thread: 3/4-14 NPT (02 suffix).
• Material: Aluminum body with 304 stainless steel sleeve.
• Weight: 1.1 kg (2.4 lb) typical, without fittings.
• Maximum Dimension (C + D): 32.9 inches (83.5 cm) with visible probe P/N and S/N.

The distinctive feature of this assembly is its CSA Type 4 enclosure rating and explosion-proof certification for hazardous areas. This ensures safe operation in environments where flammable gases or dusts may be present, meeting API 670 standards for externally mounted proximity probes.

Applications & Use Cases

Engineers often deploy the 21000-34-00-00-028-04-02 in rotating machinery monitoring, such as turbines, compressors, and pumps. Its explosion-proof design makes it ideal for oil and gas refineries, chemical plants, and other hazardous locations. Furthermore, the assembly supports intrinsically safe applications when paired with approved proximity probes.

In a typical scenario, this housing protects the probe from physical damage while providing a sealed conduit connection. Consequently, it reduces maintenance needs and extends sensor life in demanding environments.

Installation & Setup Guide

Mount the housing securely using the 3/4-14 NPT threaded port. Ensure the probe sleeve length matches the required penetration depth of 2.8 inches. For explosion-proof installations, use only CSA-rated versions with appropriate fitting options (E:00, E:01, E:02, or E:04).

Connect the probe cable through the conduit port, then tighten the dome cover to seal the assembly. Verify that all O-rings are properly seated to maintain the Type 4 enclosure rating. Finally, test the probe output before commissioning.

Maintenance & Reliability

Regular inspection of the housing assembly helps prevent unplanned downtime. Check the O-rings and seals for wear every six months, especially in corrosive environments. The aluminum and stainless steel construction resists corrosion, but periodic cleaning with a damp cloth is recommended.

Additionally, verify that the probe connector protector remains intact. If the assembly is exposed to extreme vibrations, retighten the mounting threads annually. This proactive approach extends service life and maintains measurement accuracy.

Compatibility & Integration

The 21000-34-00-00-028-04-02 works with Bently Nevada 3300 XL 8 mm proximity probes and compatible monitoring systems. It integrates seamlessly with existing 21000 series housings and can be used with various conduit fittings. For hazardous area installations, ensure the probe and housing share the same approval rating.

This assembly is also compatible with standoff adapters (not included) for custom mounting depths. Always refer to the Bently Nevada manual for specific system integration details.

Frequently Asked Questions about the 21000-34-00-00-028-04-02

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

A: The probe penetration is 2.8 inches, as indicated by the 028 suffix code.

Q: Is this housing explosion-proof?

A: Yes, when ordered with the correct fitting options (E:00, E:01, E:02, or E:04), it is CSA-rated explosion-proof for hazardous areas.

Q: What material is the housing made of?

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

Q: What is the weight of this assembly?

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

Q: Does this model include a probe cable?

A: No, the probe cable is not required with the 00 suffix for cable length.

Product Support & Availability

The Bently Nevada 21000-34-00-00-028-04-02 is in stock and ready to ship from Petro Auto Tech. We offer a 12-month factory warranty and original factory packing. Contact our team for pricing and lead times.