Configured for non-contacting shaft displacement and vibration measurements in machinery protection loops, the Bently Nevada 330709-000-050-10-12-05 (330709 Proximity Probes) provides direct physical/electrical execution.

Suffix Option Coding

• 330709: 3300 XL 11 mm Proximity Probe, 1/2-20 UNF thread, without armor

• -000: Unthreaded length (0.0 in)

• -050: Overall case length (5.0 in)

• -10: Total length (1.0 m / 3.3 ft)

• -12: Miniature coaxial ClickLoc connector, fluid-resistant boot

• -05: Multiple hazardous area and marine agency approvals

Mechanical and Electrical Parameters

Rotor Dynamics and Gap Voltage Validation

The 3300 XL 11 mm probe utilizes high-frequency eddy-current probe scaling to measure extended displacement ranges under variable rotor dynamics. Due to the larger 11 mm tip diameter, this hardware provides double the linear range of standard 8 mm probes. During physical installation, field technicians must perform a gap voltage validation. The probe must be mechanically threaded into position until the DC bias voltage at the Proximitor sensor output reaches a target value of -10.0 VDC. This electrical baseline confirms that the probe is positioned at the geometric midpoint of its 4.0 mm linear calibration envelope, optimizing the loop for long-stroke axial thrust parameters or large radial vibration excursions.

Shipping Package Inventory

• 1 x Bently Nevada 330709-000-050-10-12-05 Proximity Probe

• 2 x 1/2-20 UNF Hexagonal locknuts

• 1 x Silicone coaxial connector protective boot

• 1 x Factory physical calibration certificate pack

Field Installation Guidelines

Proper mechanical alignment is mandatory to protect the extended eddy-current field from distortion. Because of the 11 mm tip profile, the probe requires a minimum counterbore clearance diameter of 25.4 mm; any adjacent metal inside this cylindrical boundary will cause side-wall interference and alter the factory scale factor. Thread the probe into the mounting bracket while using a digital multimeter to actively trace the DC gap voltage. Once the baseline -10.0 VDC target is verified, secure the locknuts to prevent shifts caused by high-amplitude machine vibration. Hand-tighten the miniature coaxial ClickLoc connector until a mechanical click confirms engagement, then slide the fluid-resistant boot over the junction. Route the 1.0-meter probe lead through grounded protective conduit, adhering to a minimum bend radius of 25.4 mm.

Logistics and Dispatch Data

Delivery time: 2-7 days when payment finish, with all shipping executed via premium DHL/FEDEX/UPS air transport handlers. The hardware is encased within dedicated anti-static industrial packaging. This includes sealed ESD moisture-barrier bags and custom-cut high-density polyethylene foam padding designed to isolate the ceramic tip matrix and the flexible coaxial lead from transient impact or structural stresses during global transit.

Frequently Asked Questions

Q: Can a 3300 XL 11 mm probe be utilized with a standard 3300 XL 8 mm Proximitor Sensor?

A: No. The 3300 XL 11 mm probe features unique electrical characteristics, and its standard scale factor is 3.94 V/mm (100 mV/mil), whereas the 8 mm system operates at 7.87 V/mm (200 mV/mil). Pairing this probe with an incorrect Proximitor sensor will invalidate the calibration loop and trigger a system error.

Q: What is the outcome if the ClickLoc connector is disconnected while the monitoring panel is live?

A: A live disconnection of the passive probe cable instantly interrupts the high-frequency RF loop of the Proximitor. This generates an immediate open-circuit saturation voltage, forcing the matching channel on the 3500 monitoring rack into a "Not OK" status fault condition, thereby blocking false machine trip actions.

Q: Does this probe require structural grounding at the machine housing block?

A: No. The probe case is electrically isolated from the internal coil and coaxial shield. System insulation is maintained through the extension cable, and the entire monitoring loop must be grounded exclusively at a single point at the monitor rack instrument ground plane to prevent ground loop noise.