21000-16-10-00-256-01-02 Bently Nevada Proximity Housing Assembly

Global PLC Spare HUB's Insight

The 21000-16-10-00-256-01-02 assembly is the industry benchmark for externally mounted proximity probe protection. At Global PLC Spare HUB, we emphasize that this housing is not merely a mounting device but a critical safety barrier. Fully compliant with API 670 standards, its aluminum-and-stainless-steel construction ensures structural integrity in harsh petrochemical environments while maintaining the precise gapping required for high-fidelity vibration data.

Configuration Breakdown

• 21000: Proximity Probe Housing Assembly
  • Probe Option: -16 (3300 XL 8 mm probe included)
  • Probe Cable Length: -10 (1.0 meter)
  • Standoff Adapter: -00 (None)
  • Probe Penetration: -256 (25.6 inches)
  • Fittings: -01 (Explosion-proof fitting + one plug)
  • Mounting Thread: -02 (3/4-14 NPT)

Technical Specifications

• Body Material: Aluminum housing with 304 stainless steel sleeve.
• Weight: 1.1 kg (2.4 lb) typical.
• Protection Rating: CSA Type 4 enclosure; Explosion-proof.
• Thermal Rating: T5 @ Ta -50 °C to +40 °C / T4 @ Ta -50 °C to +80 °C.
• Compliance: API 670 Standard compliant.

Industrial Applications & Diagnostics

• Recommended Equipment: Large-scale industrial gas compressors, steam turbines, and critical motor-pump trains.
• Application: Secure, hazard-protected mounting for radial vibration and axial thrust position sensing.
• Diagnostic Capability: Enables stable probe positioning, ensuring the 3300 XL probe captures accurate shaft orbital data without resonance interference.

Global PLC Spare HUB Support

• Warranty: 12-month manufacturer quality assurance coverage.
• Shipping: Global express logistics via FedEx, UPS, or DHL with 24-48 hour dispatch.

Professional FAQ

• When is sleeve support required for this assembly?
  If the combined penetration length exceeds 300 mm (12 in), sleeve support is mandatory to suppress mechanical resonance.
• Can this housing be used for intrinsically safe (IS) applications?
  Yes, these housings are fully certified for IS installations when used with approved Zener barriers or galvanic isolators.
• Why does the manufacturer recommend counter-boring the machine case?
  For short penetration depths, counter-boring minimizes the side-view effects of the machine case, which otherwise creates interference.
• What is the significance of the Type 4 enclosure rating?
  Type 4 certification guarantees that the housing is watertight and dust-tight, essential for harsh industrial facilities.
• Can I adjust the probe penetration after installation?
  Yes, the adjustment range for option D is 13 mm (± 0.5 in), allowing for fine-tuning the gap during commissioning.

Selection Guidance & Comparison

• Comparison: For alternative configurations, view the 21000-28-10-15-018-04-02.
• Advice: Always verify that your conduit entry point aligns with the 3/4-14 NPT threading to ensure an airtight explosion-proof seal.
• Best Practice: During assembly, ensure O-rings are lubricated and seated correctly to maintain the IP rating of the dome cover.

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