Bently Nevada 330709-000-060-10-02-00 3300 XL 11 mm Proximity Probe

Product Overview

The Bently Nevada 330709-000-060-10-02-00 is a high-performance 11 mm eddy current proximity probe, part of the 3300 XL 11 mm Transducer System. This system is specifically designed for applications requiring a wider linear range than standard 8 mm probes, typically used for measuring axial thrust position or radial vibration on larger shafts where greater displacement is expected.

This model features an M16 x 1.5 metric thread and a 60 mm overall case length. It is configured without stainless steel armor and includes a 1.0-metre (3.3 feet) integral cable. The 11 mm system provides an extended linear range of 4.0 mm (160 mils), offering a standard scale factor of 3.94 V/mm (100 mV/mil) when paired with a matched 3300 XL 11 mm Proximitor sensor and extension cable. It is widely used in steam turbines, large compressors, and hydro-turbines for critical machinery protection.

Technical Configuration

Ordering Information

This part number is generated based on specific mechanical and electrical requirements. Verify all suffix codes before procurement to ensure system compatibility.

Engineering & Installation Guide

Extended Linear Range:

The 11 mm probe offers double the linear range of a standard 8 mm probe. This makes it ideal for axial position (thrust) measurements where shaft movement can exceed 2 mm. Ensure the target area on the shaft is at least 30.5 mm (1.2 in) in diameter to maintain the calibrated scale factor.

Mounting Clearances:

Due to the larger tip diameter, the 11 mm probe requires greater side clearance to prevent "side-view" interference from neighboring metallic surfaces. A minimum of 25.4 mm (1.0 in) clearance around the probe tip is required. For M16 x 1.5 threads, the recommended mounting torque is 24.5 N·m (18 lb·ft).

System Loop Matching:

The 3300 XL 11 mm probe is part of a tuned circuit. This 1.0-metre probe must be used with a 3300 XL 11 mm extension cable to achieve a total length of 5.0 or 9.0 metres, matching the calibration of the Proximitor sensor. Mixing 11 mm components with 8 mm or 5 mm components will result in total system failure or massive measurement errors.

Field Wiring & Protection:

The ClickLoc connector is designed for secure attachment but must be protected from oil and moisture. Use of connector protectors or oil-resistant heat-shrink tubing is strongly recommended in bearing housing environments. Ensure the coaxial cable is not routed parallel to high-voltage AC power lines to avoid electromagnetic interference (EMI).

Maintenance & Troubleshooting FAQ

Q: Can I use an 11 mm probe with an 8 mm Proximitor?

A: No. The 11 mm system has a different scale factor (100 mV/mil) compared to the 8 mm system (200 mV/mil). They are electrically incompatible and will not provide accurate data.

Q: What is the nominal DC gap voltage for the 11 mm system?

A: For a 3300 XL 11 mm system, the center of the linear range is typically reached at -10.0 Vdc. Adjust the mechanical gap during installation until the Proximitor output reaches this value.

Q: What should I do if the "OK" light on the monitor is off?

A: Check the continuity of the probe and extension cable. Ensure the ClickLoc connector is dry and properly seated. A "Not OK" status usually indicates a short circuit or an open circuit in the transducer loop.

Q: Does target material affect the 11 mm probe?

A: Yes. Like all Bently Nevada proximity probes, the 11 mm version is factory calibrated for AISI 4140 steel. If the target is a different alloy, the scale factor must be adjusted in the monitoring system configuration.