Configured for non-contact displacement sensing in Turbine Supervisory Instrumentation (TSI) systems, the Bently Nevada 330851-02-000-070-90-00-05 (330851 Proximity Probe) provides direct physical/electrical execution. Equipped with an oversized 25 mm sensor head, the hardware measures high-range dynamic thrust position or differential expansion parameters by generating a high-frequency magnetic field to interact with the target machine surface.

Suffix Array Breakdown

• Base Model (330851): 3300 XL 25 mm Proximity Probe hardware platform.

• Probe Case Type (02): M30 x 2 threaded housing.

• Unthreaded Length (000): 0 mm unthreaded section.

• Overall Case Length (070): 70 mm fully threaded case body.

• Total Length (90): 9.0 meters (29.5 feet) integral cable length.

• Armor Option (00): No Armor standard coaxial insulation.

• Agency Approval (05): Multiple Approvals for hazardous area classifications.

Technical Performance Matrix

Eddy-Current Probe Scaling and Rotor Dynamics

The 25 mm sensor tip relies on specialized eddy-current probe scaling to achieve an extended linear measurement range far exceeding standard 8 mm variants, making it optimal for long-stroke differential expansion profiles. Field integration requires strict gap voltage validation to anchor the stationary measurement center point inside the linear calibration boundary. The internal coil matrices are engineered for enhanced cross-talk suppression, preventing inductive signal distortion when multiple high-diameter 25 mm probes are positioned adjacent to each other to track high-amplitude rotor dynamics.

Electrical and Mechanical FAQ

Q: Why does this probe omit an unthreaded section (0 mm option) on the M30 x 2 case?

A: The 0 mm unthreaded configuration allows the M30 x 2 threads to extend completely to the base of the 25 mm tip. This allows maximum mechanical flexibility when screwing the probe into through-wall machine cases or thick bracket structures, ensuring complete structural stability.

Q: Can this 9.0 meter integral cable probe be paired with an independent 9.0 meter extension cable?

A: No. The driver electronics are calibrated for a total loop length of 9.0 meters. Because this probe features a native 9.0 meter cable, it must connect directly to the 9.0 meter Proximitor sensor without any mid-loop extension cables. Adding an extra cable will invalidate the factory eddy-current probe scaling.

Q: How does operating near the +177 deg C temperature limit affect the transducive element?

A: The high-temperature potting material and inner winding elements of the 330851 platform are rated for continuous execution up to +177 deg C. Operating within this limit will not cause thermal scale shift or degrade the cross-talk suppression characteristics.

Field Layout Guidelines

• Mechanical Thread Engagement: Ensure at least 5 full threads of the M30 x 2 casing are engaged into the mounting plate before locking to counter continuous mechanical frequencies.

• Side Space Boundaries: Due to the large diameter of the 25 mm tip, maintain a clear radial distance from adjacent structural metal surfaces to prevent side-viewing interference from disrupting the sensor calibration fields.

• Connector Insulation Booting: Snap the miniature coaxial connector firmly into the Proximitor link port and slide the clear insulation boot over the union to prevent the outer shield path from contacting the local machine housing.

• Coaxial Routing Paths: Secure the unarmored cable along non-moving internal machine structures using oil-resistant clamps, observing a minimum bend radius of 25.4 mm (1.0 inch) to protect the internal conductor from shearing stress.

Components Included

• Standard Line Items: One Bently Nevada 330851-02-000-070-90-00-05 25 mm proximity probe, integrated M30 x 2 mounting nuts, and a clear connector protection boot.

• Excluded System Elements: Matching external 3300 XL Proximitor sensors, calibration blocks, and weatherproof industrial junction boxes must be purchased as separate hardware components.

Logistics Dispatch and Packing Profile

• Transit Turnaround Window: Delivery time: 2-7 days when payment finish, routed internationally via premium express networks including DHL, FEDEX, or UPS.

• Packaging Specification: Shipped inside heavy-duty anti-static industrial packaging featuring custom-molded interior compartments to secure the 25 mm tip assembly and coiled 9.0 meter unarmored lead against kinetic forces during transit.