330851-02-000-060-10-00-CN | Bently Nevada | 3300 XL 25 mm Proximity Probe

Configured for non-contact displacement measurement in TSI platforms, the Bently Nevada 330851-02-000-060-10-02-00-CN (330851 Proximity Probe) provides direct physical/electrical execution.

Suffix Breakdown & Model Matrix

• 330851: 3300 XL 25 mm Proximity Probe base model.
• 02: M30 x 2 thread probe case type.
• 000: 0 mm unthreaded length.
• 060: 60 mm overall case length.
• 10: 1.0 m (3.3 ft) total system length.
• 00: No armor configuration.
• CN: Country-specific agency approval.

Hardware Specifications

Mechanical Monitoring and TSI Characteristics

The 330851 probe utilizes eddy-current probe scaling to convert shaft surface displacement into an analog voltage output. During integration, gap voltage validation is performed to achieve a -10 VDC target, ensuring the sensor operates within the linear range of the Proximitor. To maintain accurate rotor dynamics data, the probe must be oriented at 90 deg relative to the target surface. Cross-talk suppression is maintained by respecting minimum spatial clearances, which prevents signal interference caused by overlapping electromagnetic fields from adjacent sensors.

Frequently Asked Questions

Q: Can the 1.0 m system length be adjusted in the field?

A: No. The transducer system is a calibrated assembly consisting of the probe, cable, and Proximitor. Modifying the system length alters the impedance and frequency response, which invalidates the factory calibration.

Q: What is the requirement for the target surface when using a 25 mm probe?

A: The target must be conductive and flat, with a minimum diameter exceeding the probe tip area to avoid edge effects that cause non-linear output voltage shifts.

Field Installation Guidelines

• Mounting: Use the M30 x 2 threads to secure the probe body. Ensure the lock nut is tightened sufficiently to prevent movement under vibration, without exceeding the torque limit of the probe housing.
• Cable Routing: Maintain a minimum bend radius of 25.4 mm (1.0 in) for the coaxial cable. Protect the FEP jacket from abrasive contact or exposure to incompatible fluids.
• Grounding: The probe body must maintain a clean electrical path to the machine case to minimize common-mode noise on the signal output.
• Calibration: Verify the gap voltage at the Proximitor output using a high-impedance voltmeter during initial installation to confirm the probe is correctly positioned at the -10 VDC midpoint.