Bently Nevada 21000-00-00-00-042-03-02 Proximity Probe Housing Assembly

Brief Product Summary

This Bently Nevada 21000 series assembly serves as a protective external mounting for proximity probes, utilizing an aluminum enclosure and a 4.2-inch sleeve to facilitate precise sensor positioning. It is engineered to maintain environmental integrity while allowing for the external adjustment of probes during machinery operation.

Technical Overview and Functional Description

The Bently Nevada 21000-00-00-00-042-03-02 Proximity Probe Housing Assembly facilitates the installation of proximity transducers into machine bearing housings. By utilizing a high-grade aluminum construction, this assembly protects the probe from harsh external conditions while providing a stable platform for accurate vibration and position measurements.

The 21000 series is specifically intended for applications where a standard internal mount is impractical. Because this model features a 4.2-inch (107mm) sleeve length, it allows the probe to reach through thick machine casings to access the target shaft surface. Furthermore, the housing incorporates 3/4-14 NPT conduit connections, which ensure a moisture-resistant seal for the sensor cabling.

For specialized installations where the sleeve length exceeds 12 inches, users should implement additional support structures. Specifically, part number 37948-01 (probe support and oil seal) is recommended to mitigate resonance and prevent mechanical fatigue of the sleeve. Consequently, this assembly remains a critical component in Turbine Supervisory Instrumentation (TSI) systems for power generation and hydrocarbon processing sectors.

Key Technical Characteristics

• Sleeve Length: 107 mm (4.2 inches) provides extended reach for recessed mounting requirements.
• Material Construction: Manufactured from corrosion-resistant aluminum to withstand industrial atmospheric exposure.
• Conduit Interface: Features standard 3/4-14 NPT threads for seamless integration with industrial electrical piping.
• Environmental Protection: Designed to shield sensitive transducer components from oil, debris, and physical impact.
• Adjustability: Enables external positioning of the proximity probe to achieve the correct voltage gap without machine disassembly.

Specifications Table

Application Guidelines

Engineers typically deploy the 21000-00-00-00-042-03-02 in scenarios where vibration probes must be replaced or adjusted while the machine is in operation. Since the housing is externally accessible, maintenance personnel can safely modify the probe gap without exposing themselves to rotating equipment. This model is particularly effective when used in conjunction with Bently Nevada 3300 XL series 8mm or 5mm proximity systems to monitor shaft radial vibration, axial thrust, or eccentricity in large-scale turbines and compressors.