Bently Nevada 21000-28-05-00-034-04-02 Proximity Probe Housing Assemblies

The Bently Nevada 21000-28-05-00-034-04-02 Proximity Probe Housing Assembly is part of the trusted 21000 series of sensor housings designed to protect and precisely position proximity transducers in critical rotating machinery applications. This model features a compact build and tight probe fit, making it especially suited for installations with limited space or specialized OEM machinery where precise alignment is still essential.

Constructed from corrosion-resistant stainless steel and designed to provide a secure, stable environment for the probe, the 21000-28-05-00-034-04-02 is widely used in turbomachinery, compressors, gearboxes, and industrial motors. Its ability to endure severe operating environments—while maintaining probe alignment integrity—makes it indispensable in asset monitoring and machinery protection systems.

The model’s combination of shorter body length, precision machining, and IP-rated protection ensures optimal signal fidelity and long operational lifespan of the probe even in the most hostile field conditions.

Technical Specifications

Applications

The 21000-28-05-00-034-04-02 is used extensively in industries requiring high reliability, compact design, and robust protection for vibration monitoring systems. Some of the most common applications include:

• Gas & Steam Turbines

  Ideal for installations with minimal axial clearance near bearing housings or couplings.

• Compressors and Blowers

  Facilitates probe mounting on compressor casings for vibration and position detection.

• Motors and Generators

  Used on end bell or shaft housing locations in rotating electrical machinery.

• Gearboxes and Couplings

  Enables proximity probe monitoring for misalignment, backlash, or shaft runout.

• OEM Skid-Based Machinery

  Integrated into compact custom systems where space, vibration, and heat are critical factors.

• Pumps in Chemical Plants

  Installed to provide early failure detection and enable condition-based maintenance (CBM).

Product Advantages

• Compact Design for Tight Spaces

  At just 34 mm in length, this housing fits in machinery with limited installation depth.

• Precision-Machined Stainless Steel

  Ensures dimensional accuracy and resistance to harsh chemical or offshore conditions.

• Optimized Signal Integrity

  Maintains probe alignment, eliminating false readings due to mechanical looseness or misalignment.

• Reliable Sealing

  Combines gasket and O-ring to prevent ingress of dust, oil, and moisture in industrial zones.

• High Vibration Tolerance

  Withstands high-frequency vibration without probe displacement or signal degradation.

• Long-Term Durability

  Built to endure temperature extremes, shock, and continuous vibration for over 10 years in the field.

Frequently Asked Questions (FAQ)

1. What is the housing length of model 21000-28-05-00-034-04-02?

   The total length is 34 mm, making it one of the most compact options in the 21000 series.

2. Can I use this housing with Bently Nevada 3300 XL proximity probes?

   Yes, it is fully compatible with 3300 XL and 7200 series probes.

3. What kind of cable entry does it support?

   It features a ½” NPT side-entry port, which supports standard sensor cables with sealing glands.

4. Is it suitable for outdoor or offshore use?

   Absolutely. It’s IP65-rated and made from stainless steel, offering excellent corrosion resistance.

5. What type of sealing does it use?

   The assembly uses both gasket and O-ring sealing to ensure tight environmental protection.

6. Is the housing field-serviceable?

   Yes, the design supports on-site probe replacement without removing the entire assembly.

7. Does the housing require any additional bracket for mounting?

   Mounting brackets are optional and depend on the machine design; a locknut is included by default.

8. Can this housing be mounted horizontally?

   Yes, it supports both horizontal and custom mounting depending on probe configuration.

9. What certifications does this product meet?

   It meets CE and RoHS compliance for use in regulated environments.

10. Is the housing electrically conductive or isolated?

    The body is conductive stainless steel; electrical isolation is managed at the probe system level.