330706-005-046-90-02-05 Bently Nevada Reverse Mount Probe

Product Summary & Sensing Architecture

The 330706-005-046-90-02-05 serves as an eddy current displacement sensor within the Bently Nevada 3300 XL 11 mm Reverse Mount Probe family.

Engineered for machinery condition monitoring, this proximity sensor measures shaft vibration, axial position, and keyphasor timing on rotating equipment.

The reverse mount casing features M10 x 1 threads, allowing insertion from inside bearing housings where exterior access is restricted.

Constructed with an AISI 304 stainless steel case and a Polyphenylene Sulfide (PPS) tip, the assembly withstands harsh lubricating oil environments.

Global PLC Spare HUB's Insight

During a predictive maintenance overhaul on a high-pressure boiler feed pump, standard front-mount proximity probes caused oil leaks around outer machine casings.

Deploying the Bently Nevada 330706-005-046-90-02-05 allowed technicians to thread the sensor probe internally through the bearing housing wall.

Configuration Breakdown & Model Nomenclature

• Bently Nevada 3300 XL 11 mm Reverse Mount Probe Part Number Construction:
  • Base Model: 330706 — 3300 XL 11 mm Proximity Probe, Reverse Mount Configuration (M10 x 1 Threads)
  • Unthreaded / Thread Length Options: 005-046 — Specific Case and Thread Dimensions
  • Total Length Option (CC): 90 — 9.0 meters (29.5 feet) Total System Length
  • Connector Option (DD): 02 — Miniature ClickLoc coaxial connector with integral lock mechanism
  • Agency Approval Option (EE): 05 — Multiple Hazardous Area International Approvals (ATEX, IECEx, CSA)

Technical Specifications Matrix

Target Equipment & Application Scenarios

• Heavy Industrial Turbomachinery & Centrifugal Compressors:
  • Monitors shaft radial position, dynamic vibration, and thrust bearing wear inside internal oil-filled housings.
• Power Generation Gas & Steam Turbines:
  • Provides continuous keyphasor speed reference signals and axial displacement tracking on main turbine shafts.
• High-Duty Gearboxes & Industrial Fans:
  • Installs internally where external probe mounting bracketry is impossible due to space constraints.

Diagnostic Capabilities & Maintenance Notes

• Matches with standard 3300 XL Proximitor Sensors to output precise AC dynamic vibration and DC gap voltage signals.
• ClickLoc coaxial connectors click distinctly during engagement, preventing loose cable interconnects inside conduits.
• Probe DC resistance verification (8.5 ± 1.1 Ohms for 9.0m cable) provides instant field confirmation of cable conductor health.

Warranty Clause & Dispatch Logistics

• 12-Month Comprehensive Warranty: Full guarantee covering mechanical integrity and electrical accuracy.
• Rapid Shipping: Orders packed and dispatched globally within 24 to 48 hours.
• Carrier Services: Worldwide express shipping via FedEx, UPS, or DHL.

Frequently Asked Questions (FAQ)

Q: What is the mechanical advantage of a reverse mount probe over standard thread-mount probes?

A: Reverse mount probes install from inside the bearing housing, allowing cable routing through internal access ports without external glands.

Q: Why is maintaining finger-tight connector torque critical during field wiring?

A: Over-torquing beyond 0.565 N·m damages miniature coaxial threads, leading to intermittent gap signal resistance shifts.

Q: Can exposing the 330706-005-046-90-02-05 to sub-zero temperatures affect the pressure seal?

A: Yes. Temperatures below -34°C (-30°F) stiffen the Viton O-ring, potentially causing premature seal failure under oil pressure.

Q: How do technicians verify loop continuity on a 9.0-meter 3300 XL probe prior to installation?

A: Measure resistance between center and outer coaxial conductors using a multimeter; healthy 9m probes read 8.5 ± 1.1 Ohms.

Q: Does this probe require an external extension cable when connected to a 9.0m system Proximitor?

A: No. The 9.0m probe connects directly to a 9.0m rated Proximitor sensor without an intermediate extension cable.

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