Product Overview

The Bently Nevada 21000-28-05-00-092-03-02 serves as a specialized mechanical interface assembly designed for the precise mounting of eddy-current proximity transducers. This housing assembly provides the necessary rigid environment to protect transducers from harsh industrial conditions while maintaining the consistent gap alignment required for accurate rotor dynamics monitoring. By isolating the transducer from machine-induced structural vibration, this assembly ensures that the electrical signals provided to the monitoring rack are representative of actual shaft displacement.

Technical Specifications

Model Configuration Explanation

The 21000-28-05-00-092-03-02 model string defines the physical parameters of the housing:

• 21000: Base series for Bently Nevada proximity probe housings.

• 28: Compatibility with 8 mm diameter proximity probes.

• 05: Mounting thread interface (3/4-14 NPT for standard machine port integration).

• 00: Configuration indicating no additional intermediate extensions.

• 092: Overall housing assembly length of 92 mm.

• 03: Conduit fitting specification for industrial wiring protection.

• 02: Material and coating specification optimized for high-temperature and chemical resistance.

Typical Applications

The 21000 series housing assembly is utilized in critical turbomachinery environments:

• Gas and Steam Turbines: Supporting probes monitoring radial shaft vibration in bearing housings.

• Industrial Gearboxes: Protecting sensors in high-vibration, oil-mist environments.

• Centrifugal Pumps: Providing a secure, pressure-tight seal for monitoring shaft axial position.

• Test Stand Instrumentation: Enabling quick, reliable replacement of transducers during machine development cycles.

System Compatibility

This housing is mechanically engineered to accommodate all standard Bently Nevada 8 mm proximity probes. The internal thread design is matched to standard 8 mm probe thread pitches, allowing for precise adjustment of the probe gap. It is intended for use with Bently Nevada Proximitor sensors, where the rigid mounting provided by the 21000 series is necessary to prevent signal noise (cross-talk or resonance) from interfering with the transducer's calibrated linear range.

Installation Guidelines

Installation must be performed to ensure the transducer remains stable and shielded:

• Preparation: Inspect machine ports for thread integrity; ensure no debris is present that could misalign the housing.

• Sealing: Apply an industry-standard thread sealant (compatible with process fluids and temperatures) to the 3/4-14 NPT mounting threads.

• Mounting: Thread the assembly into the port, ensuring the housing remains perpendicular to the shaft centerline to maintain uniform gap sensitivity.

• Alignment: Perform a mechanical gap check using a depth micrometer once the probe is inserted into the housing.

• Securing: Utilize the provided jam nuts to lock the housing position. Over-torquing should be avoided to prevent thread deformation.

• Grounding: Confirm that the stainless steel housing is in electrical contact with the machine frame to ensure proper system shielding.

Product Advantages

• High-Temperature Performance: Designed to maintain structural rigidity and seal integrity up to 177 deg C.

• Corrosion Resistance: The stainless steel alloy provides a durable barrier against oxidation and harsh lubrication chemistries.

• Noise Mitigation: Reduces measurement errors caused by mechanical resonance through robust, low-deflection material characteristics.

• Simplified Maintenance: Standardized dimensions facilitate rapid replacement during scheduled machine outages.

Ordering Information

The 21000-28-05-00-092-03-02 housing kit includes the following components:

• One (1) 92 mm stainless steel housing assembly.

• Integrated conduit fitting (Suffix 03).

• Installation locking nuts and washers.

• Protective O-rings for port sealing.

• Note: Confirm the specific probe length matches the housing's internal reach requirement before final installation.

Frequently Asked Questions

• Can this housing be used in high-pressure oil cavities?

  Yes, provided that the 3/4-14 NPT threads are installed with a suitable high-pressure rated sealant or thread compound.

• What is the primary purpose of the 92 mm length?

  The 92 mm length is a standard compact housing dimension designed for shallow-depth machine ports where minimal stick-out is required.

• Does this housing require specialized grounding?

  The housing must be installed to create a metal-to-metal contact with the machine chassis, ensuring the transducer shield is properly grounded.

• How do I ensure the probe tip does not vibrate within the housing?

  The internal threads of the 21000 series are precision-machined to ensure a tight fit with the probe body; secure the probe using the provided lock nuts.

• Is the housing material resistant to synthetic lubricants?

  Yes, the stainless steel used in this assembly is compatible with most standard turbine and synthetic lubrication oils.

• How does this assembly affect transducer calibration?

  The housing is a passive component; however, rigid mounting prevents vibration-induced "jitter," which is essential for accurate factory-calibrated signal response.

• What should I do if the threads are damaged during installation?

  If threads are cross-threaded or damaged, the housing assembly must be replaced to ensure the pressure seal and structural rigidity are maintained.

• Are there different conduit fitting options?

  Yes, the 21000 series offers various conduit fitting types; this specific model includes the 03 option, matching standard industrial cable conduit requirements.