Description

The Bently Nevada 330709-000-070-10-02-00 serves as the primary 330709 Proximity Probe utilized to execute non-contact displacement and vibration measurements across Bently Nevada 3300 XL Series Machinery Protection platforms. Consequently, this non-contacting sensor translates the physical gap variation between the probe tip and a rotating shaft into an analog radio frequency feedback loop.

Suffix Breakdown & Model Matrix

• 330709: Base model number for 3300 XL 11 mm Proximity Probe with metric M16 x 1.5 thread and no armor.
• -000: Unthreaded length option designating 0 mm of unthreaded case section.
• -070: Overall case length option designating a 70 mm threaded body.
• -10: Total length option specifying a 1.0 meter (3.3 feet) integrated cable configuration.
• -02: Connector and cable option designating a miniature coaxial ClickLoc connector on standard cable.
• -00: Agency approval option specifying standard configuration with no hazardous area certifications.

Hardware Specifications

Transducer Interface & Mechanical Monitoring Characteristics

This probe system establishes a calibrated magnetic field to maintain precise eddy-current probe scaling when targeting industrial materials such as AISI 4140 steel. The physical construction ensures a low-loss signal path to support accurate gap voltage validation (-10 VDC targets) within the center of the calibrated linear range. Furthermore, the internal sensing coil provides native cross-talk suppression against adjacent probe assemblies, isolating external electronic noise from the dynamic waveforms used to evaluate high-speed rotor dynamics.

Frequently Asked Questions

Q: Why is the scale factor of this 11 mm probe lower than that of standard 8 mm probes?

A: The 11 mm tip diameter expands the physical size of the eddy-current field to achieve a broader linear range of 4.0 mm. Consequently, the trade-off for this extended measurement depth is a reduced scale factor sensitivity of 3.94 V/mm (100 mV/mil) compared to the 8 mm variant.

Q: What are the installation hazards associated with the unarmored standard cable?

A: The lack of stainless steel armor reduces weight and spatial constraints but exposes the outer FEP jacket to direct mechanical abrasion and pinching. Forcing the unarmored cable past a minimum bend radius limit of 25.4 mm permanently deforms the internal shielding layer, altering system capacitance.

Field Installation Guidelines

1. Thread the metric M16 x 1.5 probe case into the machined casing hole by hand to prevent cross-threading the mounting profile.
2. Adjust the probe depth mechanically while evaluating the live DC loop voltage to reach the designated -10 VDC baseline setting.
3. Torque the primary mounting locknuts to a maximum limit of 63.3 N m to ensure mechanical locking without warping the body.
4. Clean the gold-plated brass ClickLoc coaxial terminals and press them together firmly by hand until an audible physical click registers positive mechanical engagement.