Bently Nevada 21000-16-10-15-081-03-02 Proximity Probe Housing Assembly

Engineering Overview: Advanced Proximity Protection

The 21000-16-10-15-081-03-02 is a precision-engineered Proximity Probe Housing Assembly from Bently Nevada. Designed to house the industry-standard 3300 XL 8mm proximity system, this assembly provides a rugged, environmentally sealed enclosure for vibration monitoring in critical rotating equipment. It is fully compliant with API 670 standards, ensuring that internal probe electronics remain protected from process fluids, mechanical impact, and hazardous atmospheric conditions.

Configuration Breakdown

The following table details the specific technical configuration for the 21000-16-10-15-081-03-02:

• Model: 21000 (Proximity Probe Housing Assembly)
• Probe Option (16): 3300 XL 8 mm probe
• Cable Length (10): 1.0 m (39 in)
• Standoff Adapter (15): 1.5 in (38 mm)
• Probe Penetration (081): 8.1 in
• Fittings (03): Conduit plug, reducer, and seal grip kit
• Mounting Thread (02): 3/4-14 NPT

Global PLC Spare HUB’s Insight

The 21000-16-10-15-081-03-02 excels in environments where sensor stability is threatened by heavy industrial vibration or ambient chemical exposure. Its aluminum body paired with a stainless steel sleeve provides the perfect balance of weight reduction and corrosion resistance. We recommend this specific configuration for long-reach installations where precise probe penetration is required to bypass machinery casing obstructions.

Applications, Diagnostics & Logistics

• Suitable Equipment: Large centrifugal compressors, steam turbines, gas turbines, and heavy-duty industrial gearboxes.
• Diagnostic Capability: Enables stable acquisition of gap, vibration, and position data. The housing design allows for easy maintenance of the reverse-mount proximity probe without requiring a total teardown of the machine casing.
• Warranty: Guaranteed 12-month factory-grade warranty.
• Shipping: Expedited global transit via FedEx, UPS, or DHL; 24–48 hour dispatch.

Model Comparison & Technical Advice

Below is a technical comparison for your selection process:

• 21000-16-10-15-081-03-02 (Current Selection): Optimized for 8.1-inch penetration with a 1.5-inch standoff. Best for deep-cavity machine casing requirements.
• 21000-28-05-00-070-01-02: Features a shorter penetration (7.0-inch) and no standoff adapter.

Technical Suggestion: If your machine case has limited clearance, the 21000-28-05-00-070-01-02 is superior. However, for installations requiring thermal or mechanical standoff to avoid casing resonance, the 21000-16-10-15-081-03-02 provides the necessary reach and structural integrity.

Expert Frequently Asked Questions

Why is sleeve support required for penetrations greater than 12 inches?
At lengths exceeding 12 inches, probe resonance becomes a high risk. Supporting the sleeve prevents false vibration readings caused by mechanical excitation of the probe tip.

How does the CSA explosion-proof rating affect my installation?
The assembly is rated for Class 1, Divisions 1 & 2. You must use appropriate explosion-proof conduit seals at the port entry to maintain the integrity of the enclosure in hazardous zones.

Can I replace the proximity probe while the housing is mounted?
Yes, the dome cover design allows for probe removal/replacement without unmounting the entire housing assembly from the machine casing.

What is the purpose of the included conduit fitting kit (-03)?
The kit provides NPT adapters and a cable seal grip to ensure that the internal wiring is completely isolated from moisture and contaminants—essential for outdoor installations.

How do I handle the counter-boring requirement mentioned for short penetration depths?
For penetrations under 2 inches, counter-boring ensures that the housing does not "see" the side of the bore, which would otherwise introduce signal noise (side-view effects) into your vibration data.

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