SKU: 330703-000-070-10-02-00

Bently Nevada 3300 XL 11 mm Proximity Probe 330703-000-070-10-02-00

The Bently Nevada 330703-000-070-10-02-00 is a 3300 XL 11 mm proximity probe with an M14x1.5 metric thread and a 1.0-meter total length. Engineered for an extended 4.0 mm linear range, it provides professional-grade axial position and vibration monitoring for large-scale industrial turbines.

Technical Functionality and Measurement Principle

The Bently Nevada 330703-000-070-10-02-00 operates as a high-precision displacement sensor within the 3300 XL 11 mm Proximity Transducer System. This eddy current probe measures the dynamic and static distance between the probe tip and a conductive target surface, such as a turbine shaft. Because this model utilizes an 11 mm tip diameter, it achieves a significantly larger linear range compared to standard 8 mm probes. This expanded measuring window allows the sensor to monitor machinery with greater axial float or significant thermal expansion, ensuring that the system captures critical data even during extreme mechanical shifts.

Part Number Configuration and Specifications

The specific digits in the 330703-000-070-10-02-00 code designate the physical dimensions and electrical certifications of the unit.

Model Number: 330703 (3300 XL 11 mm Probe with M14 x 1.5 Metric Thread)
Unthreaded Length: 0 mm
Overall Case Length: 70 mm
Total Length: 1.0 meter (3.3 feet)
Connector Option: Miniature coaxial ClickLoc connector with connector protector
Agency Approval: Standard (Non-hazardous area)
Sensor Tip Diameter: 11 mm
Linear Range: 4.0 mm (160 mils)
Scale Factor: 3.94 V/mm (100 mV/mil)
Target Material: AISI 4140 Steel (Standard calibration)

Strategic Industrial Applications

Industrial facilities deploy the 330703 series primarily when the machine’s expected movement exceeds the 2.0 mm limit of standard sensors. Consequently, this probe is a staple in Turbine Supervisory Instrumentation (TSI) for large-scale power generation and oil and gas processing. Furthermore, the probe’s design features a polyphenylene sulfide (PPS) tip, which prevents fluid ingress and maintains electrical insulation in harsh environments.

Primary use cases include:

Monitoring axial (thrust) position in large steam and gas turbines
Measuring differential expansion between the machine rotor and casing
Tracking radial vibration in heavy-duty fluid-film bearings
Providing phase reference signals in high-speed rotating assets

Integration and System Reliability

The 330703-000-070-10-02-00 integrates directly with a 3300 XL extension cable and an 11 mm Proximitor Sensor. Because Bently Nevada optimizes the 3300 XL series for signal stability, this probe effectively resists electromagnetic interference (EMI) and eliminates “crosstalk” between adjacent sensors. Moreover, the patented ClickLoc connector ensures a secure, vibration-proof link between the probe and the extension cable. By installing this transducer, maintenance teams receive the high-resolution data necessary to implement predictive maintenance, thereby reducing the risk of unplanned downtime and extending the service life of critical rotating equipment.