Bently Nevada 330709-000-070-10-02-00 3300 XL 11mm Proximity Probe

The Bently Nevada 330709-000-070-10-02-00, also cataloged as the 330709 Proximity Probe, operates as a dedicated hardware component for non-contact displacement measurement within TSI (Turbine Supervisory Instrumentation) networks.

Suffix Breakdown & Model Matrix

• 330709: 3300 XL 11 mm Proximity Probe base model.
• 000: 0 mm unthreaded length.
• 070: 70 mm overall case length.
• 10: 1.0 m total system length (requires matching 1.0 m Proximitor).
• 02: Miniature coaxial ClickLoc connector with standard cable.
• 00: No agency approval.

Hardware Specifications

Mechanical Monitoring and TSI Characteristics

This 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. Furthermore, rigorous 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 this 1.0 m system length be adjusted by swapping cables?

A: No. The 3300 XL transducer system is a calibrated assembly consisting of the probe, extension cable (if applicable), and Proximitor. Any modification to the cable length alters the system impedance and negates the factory-calibrated frequency response.

Q: What is the risk of excessive torque on the probe casing?

A: The probe body is designed for a specific torque limit. Exceeding the maximum rating can cause deformation of the casing, potentially compromising the internal sensing coil and resulting in non-linear signal output or premature failure.

Field Installation Guidelines

• Target Surface: Ensure the target material is AISI 4140 steel or equivalent for factory-standard linearity. Target diameter must exceed 30.5 mm to avoid edge effects.
• Mounting: Use the M16 x 1.5 threads to secure the probe. Ensure the lock nut is tightened firmly to prevent vibration-induced gap shifts.
• Cable Routing: Maintain a minimum bend radius of 25.4 mm. Protect the FEP cable jacket from abrasion or exposure to incompatible chemicals.
• Electrical Grounding: The probe body must maintain a clean, low-impedance electrical path to the machine case to prevent 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.