Product Overview

The Bently Nevada 21000-33-10-00-087-04-02 represents the industry standard for external proximity probe mounting in critical machinery protection environments. This robust aluminum housing assembly provides a secure, explosion-proof enclosure for proximity probes, facilitating precise radial vibration and axial position measurements on high-speed turbines, compressors, and motors. Engineered for high-reliability scenarios, it allows for seamless probe adjustment and replacement without machine disassembly, directly supporting Turbine Supervisory Instrumentation (TSI) accuracy. By isolating the sensor from harsh external elements while maintaining rigid mechanical alignment, this housing ensures that the Bently Nevada 3500 system receives stable, high-fidelity signals necessary for preventing catastrophic asset failure and optimizing maintenance intervals.

Model Configuration Analysis

21000 - Proximity Probe Housing Series

The 21000 series is the foundational aluminum housing designed for global industrial applications requiring hazardous area certifications and rugged environmental protection.

-33-10-00 - Mounting and Thread Geometry

The "-33" indicates a 3.3-inch unthreaded sleeve length, allowing the probe to bypass thick insulation or casing walls. The "-10" and "-00" suffixes define specific internal probe diameters and the primary mounting thread pitch for the housing body.

-087 - Total Sleeve Length

This suffix specifies a total sleeve length of 8.7 inches. Precise length selection is mandatory to ensure the probe reaches the target surface while remaining within its calibrated linear range.

-04-02 - Hazardous Area and Conduit Options

The "-04" configuration provides multiple global agency approvals, including ATEX and CSA for explosive atmospheres. The "-02" option equips the unit with a 3/4-14 NPT conduit entry for standardized industrial electrical connections.

Technical Specifications

Field Engineering Guidelines

Engineers must prioritize the probe "Gap Voltage" during the commissioning phase. Rotate the probe sleeve until the Proximitor Sensor output registers approximately -10.0 Vdc, ensuring the sensor operates in the center of its linear region. Apply a high-quality thread lubricant to the 3/4-14 NPT housing threads to prevent seizing in high-heat environments. Always verify that the flexible conduit has sufficient slack to accommodate machine thermal expansion; failure to do so can strain the probe lead and introduce signal noise into the DCS or 3500 rack.

Critical Environment Performance

The 21000-33-10-00-087-04-02 excels where standard mounts fail. Its anodized aluminum construction resists oxidation and chemical exposure, maintaining an airtight seal against oil mist and moisture. This housing provides the mechanical damping required to eliminate parasitic vibrations that could lead to "False Trips" in systems like Honeywell Experion PKS. By ensuring a rigid, fixed distance between the probe and the shaft, it provides the sub-micron resolution needed for predictive diagnostics in high-pressure steam and gas turbine applications.

Ordering info

• One (1) Brand New Bently Nevada 21000 Aluminum Housing.

• Internal adjustable probe sleeve (8.7 inch total length).

• Sealing O-ring and gasket kit for environmental protection.

• Locking nut for secure probe positioning.

• Manufacturer's Certificate of Conformance.

Shipping & Global Dispatch

Delivery time: 3-5 days when payment finish through our preferred carriers DHL, FEDEX, or UPS. We utilize multi-layered anti-static industrial packaging and custom foam shielding to ensure the unit arrives in pristine, factory-sealed condition. Each shipment includes a comprehensive packing list and tracking data for global transparency.

Technical Support Q&A

Q1: Can this housing be used with non-Bently Nevada probes?

A1: While physically possible with adapters, we strictly recommend using genuine 3300 XL series probes to maintain system calibration and the hazardous area certification integrity of the 21000 assembly.

Q2: What is the benefit of the 3.3-inch unthreaded length (-33)?

A2: This unthreaded section allows the sleeve to pass through a machine's thermal insulation or a thick outer casing without the risk of cross-threading or mechanical binding during deep-set installations.

Q3: Does this housing include the proximity probe?

A3: No. The 21000 series designates the housing assembly only. Probes, extension cables, and Proximitor sensors must be specified separately based on your target material and measurement range requirements.

Q4: How do I maintain the IP66 rating over time?

A4: Inspect the VITON O-rings during every maintenance turnaround. Replace any seals that show signs of compression set or thermal degradation to prevent oil ingress into the probe cavity.