Product Overview
The Bently Nevada 21000-28-10-00-217-04-02 is a precision-engineered proximity probe housing assembly designed for reliable vibration monitoring in critical rotating machinery. This industrial automation module combines a rugged aluminum body with a 304 stainless steel sleeve, ensuring durability in harsh environments. The model number 21000-28-10-00-217-04-02 specifies a 3300 XL 8 mm probe with a 1.0 m cable, 21.7-inch probe penetration, and a 3/4-14 NPT mounting thread.
This housing assembly is part of the Bently Nevada 21000 series, known for its accuracy and longevity in condition monitoring applications. Whether you are upgrading an existing system or installing new monitoring points, the 21000-28-10-00-217-04-02 delivers consistent performance.
Technical Specifications
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Probe Option: -28 (3300 XL 8 mm probe with multiple approvals)
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Probe Cable Length: 1.0 m (39 inches)
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Standoff Adapter: None (option -00)
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Probe Penetration: 21.7 inches
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Fitting Option: One 3/4-14 NPT plug only (option -04)
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Mounting Thread: 3/4-14 NPT (option -02)
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Material: Aluminum body with 304 stainless steel sleeve
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Weight: 1.1 kg (2.4 lb) typical, without fittings
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Certification: CSA Type 4 enclosure; explosion-proof when ordered with specific options
The 3/4-14 NPT thread provides a standard, secure mounting interface compatible with most industrial machine casings. The 304 stainless steel sleeve resists corrosion, making this housing suitable for humid or chemically aggressive environments.
Industry Applications
This proximity probe housing assembly is ideal for monitoring shaft vibration and axial position in turbines, compressors, pumps, and large electric motors. For example, in a petrochemical plant, the 21000-28-10-00-217-04-02 can be mounted on a compressor train to detect early signs of rotor instability, allowing maintenance teams to plan interventions before unplanned downtime occurs.
In power generation, the housing supports continuous vibration monitoring of steam turbine bearings. The 21.7-inch probe penetration enables deep insertion into the machine casing, ensuring accurate measurement even when access is limited. Its CSA Type 4 rating protects against water and dust ingress, which is critical in outdoor or washdown areas.
Installation & Setup Guidance
Before installation, verify the mounting thread (3/4-14 NPT) matches the machine's tapping. Clean the mounting hole thoroughly to ensure a proper seal. When inserting the probe, maintain the specified penetration depth of 21.7 inches to achieve optimal gap voltage. Do not overtighten the fitting, as this can damage the probe tip or distort the housing.
Route the 1.0 m cable away from high-voltage lines and sharp edges. Use cable clamps to secure the cable and prevent vibration-induced fatigue. If an explosion-proof configuration is required, select the appropriate fittings during ordering to maintain the CSA certification.
Maintenance & Reliability
Regularly inspect the housing for signs of wear, especially the stainless steel sleeve and the NPT threads. Check the cable for cuts or abrasions, as damaged cabling can lead to intermittent signal loss. Periodically verify the probe gap using a calibration tool to ensure readings remain accurate.
Because the 21000-28-10-00-217-04-02 uses a 304 stainless steel sleeve, it offers superior resistance to corrosion compared to standard carbon steel housings, reducing the frequency of replacements. By following a preventive maintenance schedule, you extend the service life of the probe assembly and minimize costly downtime.
Compatibility & Integration
The 21000-28-10-00-217-04-02 is designed for use with Bently Nevada 3300 XL 8 mm proximity probes (option -28). It is compatible with Bently Nevada vibration monitoring systems, including the 3500 series rack-based monitors and the newer 3300 series. The standard 3/4-14 NPT thread ensures mechanical compatibility with most industrial machine ports.
For signal processing, connect the probe to a compatible Bently Nevada monitor that provides power and converts the proximity signal into vibration or position readings. The housing itself does not require external power; it serves as a mechanical interface and protective enclosure for the probe.
Selection Guide & Purchasing Advice
When ordering, confirm that the configuration matches your requirements: the probe option (-28), cable length (-10), standoff adapter (-00), penetration (-217), fitting (-04), and mounting thread (-02). If you need a standoff adapter or different fitting, select the appropriate option codes. For explosion-proof installations, ensure the fittings and enclosure meet your area classification.
PLC Source PRO offers genuine Bently Nevada parts with fast shipping. Contact our team to verify stock and lead times for the 21000-28-10-00-217-04-02. We are a trusted supplier for industrial automation spares, ensuring you receive authentic components for your critical machinery.