Product Overview

The Bently Nevada 21000-00-00-00-039-03-02 is a specialized industrial enclosure engineered for the external mounting of proximity sensors on critical rotating machinery. Part of the robust 21000 series, this housing serves as a protective interface between the transducer and the industrial environment, allowing for precise shaft vibration and axial position monitoring. This specific configuration features a 3.9-inch (99mm) sleeve length, providing a mid-range reach for machine casings that require a standardized external mounting footprint.

By utilizing a reverse-mount probe configuration within this housing, maintenance teams can access, gap, and replace sensors without breaching the machine's internal casing or requiring an equipment shutdown. This design is foundational to modern Turbine Supervisory Instrumentation (TSI) and predictive maintenance strategies, ensuring maximum machine availability and streamlined sensor calibration.

Key Technical Characteristics

Constructed for high-reliability performance, the 21000-00-00-00-039-03-02 incorporates mechanical and environmental safeguards to preserve signal integrity.

• Machined Aluminum Construction: The all-metal body provides superior resistance to corrosion and mechanical impact, making it ideal for the demanding conditions of refineries and power plants.

• Environmental Sealing System: Equipped with a threaded dome cover and integrated O-ring seals, the assembly prevents the ingress of moisture, oil vapors, and process contaminants into the sensor cavity.

• Optimized Sleeve Design: The 3.9-inch sleeve is precision-machined to ensure rigid sensor placement, eliminating mechanical resonance that could interfere with high-frequency vibration data.

• Standardized Conduit Interface: Features 3/4-14 NPT threaded ports for secure integration with explosion-proof conduits, ensuring a safe and shielded path for the transducer signals.

• Enhanced Serviceability: The reverse-mount architecture simplifies the adjustment of the probe's linear electrical range (DC gap voltage) from outside the machine, significantly reducing maintenance man-hours.

Technical Specifications

• Manufacturer: Bently Nevada (Baker Hughes)

• Model Designation: 21000-00-00-00-039-03-02

• Primary Function: External Proximity Probe Mounting

• Sleeve Length: 3.9 Inches (99 mm)

• Housing Material: High-grade Aluminum

• Port Specification: 3/4-14 NPT Threaded

• Probe Compatibility: 3300 XL 8mm Reverse Mount Probes

• Seal Integrity: O-ring Protected Probe Sleeve

• Physical Mass: 1.08 kg

• Country of Origin: USA

Industrial Applications

The 21000-00-00-00-039-03-02 housing is a vital component for protecting high-capital assets across various sectors:

• Monitoring radial vibration and thrust on steam and gas turbines.

• Safeguarding centrifugal and axial compressors in hydrocarbon processing.

• Protecting sensors on high-pressure fluid pumps and industrial gearboxes.

• Vibration analysis for large-scale electric motors and cooling tower fan assemblies.