21000-16-10-15-070-03-02 Bently Nevada Proximity Probe Housing Assembly

Product Introduction

The Bently Nevada 21000-16-10-15-070-03-02 is a rugged, externally mounted proximity probe housing assembly designed for high-reliability vibration monitoring in hazardous industrial environments. Compliant with API 670 standards, this aluminum housing protects reverse-mount 3300 XL probes from environmental damage while allowing for easy gap adjustment without machine disassembly. For critical dimensioning, resonance prevention guidelines, and explosion-proof wiring diagrams, please download the official technical reference: Download 21000 Series Installation Manual.

Configuration Hierarchy: Suffix Tree

• 21000 — Explosion-Proof Aluminum Housing Body
  • └─ 16 — Probe Option: 3300 XL 8 mm reverse-mount probe
  • └─ 10 — Probe Cable Length: 1.0 meter (39 inches)
  • └─ 15 — Standoff Adapter Length (C): 1.5 inches (38 mm)
  • └─ 070 — Probe Penetration (D): 7.0 inches (178 mm)
  • └─ 03 — Fittings: NPT Reducers & Multi-size Seal Grommets
  • └─ 02 — Mounting Thread: 3/4-14 NPT

Core Engineering Specifications

• Body Material: A380 Aluminum (Lightweight & Corrosion Resistant)
• Sleeve Material: AISI 304 Stainless Steel (High Mechanical Integrity)
• Enclosure Rating: CSA Type 4 / IP-rated for moisture/dust exclusion
• Adjustment Range: ± 0.5 in (13 mm) for precise probe gap setting
• Hazardous Approvals: CSA Class I Div 1 & 2 (Groups C, D); Class II; Class III
• Standard Compliance: Fully API 670 compliant for external housings
• Typical Weight: 1.1 kg (2.4 lb) excluding additional fittings

Global PLC Spare HUB's Insight

The 21000-16-10-15-070-03-02 is the "Service Engineer's Choice" for large rotating machinery. By utilizing an external housing, you can calibrate or replace a vibration probe while the machine is running, avoiding costly downtime. The 1.5-inch standoff combined with a 7-inch penetration is specifically designed for bearing pedestals with external thermal insulation or heavy cast-iron casings. Note that because the D dimension exceeds 5 inches, we strongly recommend checking for mechanical resonance in the sleeve to ensure high-frequency vibration signal accuracy.

Field Application & Diagnostic Value

• Target Machinery: Large centrifugal compressors, steam turbine bearings, and boiler feed pumps.
• Diagnostic Capability: Enables 24/7 radial vibration and axial position monitoring.
• Application Advantage: Protects the delicate probe-to-extension cable connection from oil, moisture, and mechanical impact.

Commercial Logistics

• Condition: New & Original (Factory Sealed Packing)
• Warranty: 12 Months Comprehensive Warranty
• Dispatch Time: Ships within 24-48 hours from stock
• Global Express: Secure delivery via FedEx, UPS, or DHL

Technical FAQ (Field Experience)

• Q: Why is the standoff adapter (Option 15) necessary for this configuration?
• A: The standoff adapter provides the required clearance between the housing body and the machine casing. It allows the 7-inch sleeve to penetrate deeply enough to reach the shaft while keeping the housing body accessible for external gapping.
• Q: Does the 7-inch penetration (D=070) require extra mechanical support?
• A: Per Bently Nevada guidelines, internal support is mandatory if the total length (C+D) exceeds 12 inches. While this 8.5-inch reach is usually stable, engineers should verify there is no resonance at the machine’s specific operating RPM.
• Q: How does the "03" fitting option assist with different field cable sizes?
• A: Option 03 is a "Universal Kit" including grommets for cable sizes from 1/8 to 3/8 inches. This ensures a tight, environmental seal regardless of whether you are using standard or heavy-duty triaxial field wiring.
• Q: Can this aluminum housing be used in offshore/marine environments?
• A: While the 21000 is Type 4 rated, for highly corrosive marine/salt-spray environments, we typically recommend the 24701 Stainless Steel version. However, A380 aluminum is excellent for most onshore industrial refineries.
• Q: What is the significance of the "reverse mount" probe used inside this housing?
• A: Unlike standard probes threaded from the front, a reverse-mount probe (Option 16) is installed from the rear of the sleeve. This allows it to be tightened and gapped from the outside of the machine through the housing body.

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