Configured for high-frequency non-contact displacement acquisition within machinery monitoring architectures, the Bently Nevada 330707-00-20-10-11-00 (330707-00-20-10-11-00 Proximity Probes) provides direct physical/electrical execution.

Suffix Breakdown & Model Configuration

• Base Model Code: 330707 (3300 XL 11 mm proximity probe assembly variant)
• Unthreaded Length Option: 00 (0.0 in unthreaded section length profile)
• Overall Case Length Option: 20 (2.0 in total housing case length specification)
• Total System Cable Length: 10 (1.0 meter integrated cable length format)
• Connector and Cable Option: 11 (FluidLoc miniature coaxial ClickLoc connector layout)
• Agency Approval Option: 00 (Standard unclassified area profile certification)

Hardware Specifications Table

Eddy-Current Probe Scaling & Rotor Dynamics

The 11 mm transducer topology establishes an extended linear operating envelope optimized for larger journal and thrust bearings. Output scaling maintains a steady sensitivity of 3.94 V/mm across the dynamic displacement window. During mechanical alignment, gap voltage validation must confirm a nominal -10 VDC baseline at mid-stroke position to prevent signal clipping during severe vibration transients. Proper coaxial shielding and routing protocols ensure robust cross-talk suppression across multi-channel monitor racks.

Standard Delivery Scope Manifest

• 1 x 3300 XL 11 mm Proximity Probe Assembly with 1.0 m FluidLoc Cable
• 1 x Mounting Locknut Accessory
• 1 x Fluorocarbon Terminal Protection Cap

Mechanical Installation and Routing Guidelines

• Bore Alignment: Ensure strict perpendicularity between the mounting thread axis and the monitored rotor shaft surface to prevent measurement skew.
• Radial Clearance: Maintain a minimum radial air gap clearance from surrounding structural metals to eliminate parasitic eddy-current damping.
• Torque Application: Apply calibrated wrench torque when threading the probe housing into machinery ports to prevent mechanical thread distortion.
• Cable Protection: Route the integrated coaxial lead through dedicated metal conduit while respecting minimum bending radius limitations.

Frequently Asked Questions and Technical Responses

• What is the calibrated output scale factor for this 11 mm transducer model?

  The nominal output scale factor is 3.94 V/mm when paired with an approved 3300 XL 11 mm Proximitor sensor.

• What special property does the FluidLoc option provide to the assembly?

  It features an internal seal that prevents process oil and fluids from migrating out of the machine through the cable core.

• Can an 11 mm probe be connected to a standard 8 mm proximitor driver?

  No, 11 mm transducer components require matched 11 mm electronic drivers to preserve correct signal scaling and impedance.

• What is the continuous temperature tolerance rating of the probe tip?

  The tip assembly is rated for continuous thermal operation between -51 deg C and +177 deg C.

• How is the static gap voltage verified during system commissioning?

  A high-impedance digital voltmeter is connected to the monitor channel terminals to confirm the -10 VDC baseline.

• What target material alloy is required for accurate displacement calibration?

  Factory scaling assumes a standard AISI 4140 carbon steel shaft surface; alternative alloys require specific correction factors.

• What is the primary cause of signal degradation during continuous operation?

  Moisture infiltration inside the coaxial connector or mechanical abrasion of the outer insulation layer.

• Why is an unthreaded casing length specified on certain mounting variants?

  The unthreaded section allows precise depth positioning through mounting brackets and sleeve adapters without thread binding.