Configured for shaft displacement and vibration measurement in 3300 XL transducer systems, the Bently Nevada 330703-00-100-10-11-CN (330703 Proximity Probes) provides direct physical signal execution via eddy-current induction.

Model Configuration Logic

The 330703-00-100-10-11-CN identifies an 11 mm proximity probe assembly. The configuration string specifies the unthreaded length, case length, total system length, and connector interface type, calibrated for integration with Bently Nevada 3300 XL monitoring platforms.

Hardware Specifications

Eddy-Current Induction and Rotor Dynamics

This transducer assembly utilizes eddy-current probe scaling to convert target gap distance into a proportional voltage signal. Achieving gap voltage validation at the nominal -10 VDC setpoint is necessary for linear measurement. The 11 mm tip geometry provides a broader linear range compared to 8 mm variants, requiring careful calibration to track rotor dynamics accurately. Cross-talk suppression in high-density installations is maintained by adhering to physical separation standards between adjacent probe tips to prevent oscillation interference in the Proximitor signal.

Ordering Info

• One (1) 330703-00-100-10-11-CN Proximity Probe

• Two (2) 3/4-16 UNF locking nuts

• Cable connector protector

• Linearity certification against 4140 steel target

Field Installation Guidelines

• Mechanical Alignment:

• Clear the machine mounting port of debris.

• Use a depth micrometer to set the probe at the specified nominal gap distance before tightening the lock nuts.

• Termination and Grounding:

• Engage ClickLoc connectors until a tactile click confirms positive electrical continuity.

• Ensure the probe housing maintains a low-impedance connection to the machine chassis for effective electromagnetic shielding.

• Cabling:

• Route coaxial leads within dedicated metallic conduit to prevent environmental ingress and electromagnetic noise induction.

Frequently Asked Questions

• Can this probe be field-trimmed?

  No. The coaxial cable is factory-matched to the system impedance. Altering the length introduces signal reflections and invalidates the factory calibration.

• What is the impact of shaft material on the signal?

  The probe is calibrated for 4140 steel. Alternative shaft materials change the eddy-current eddy-field interaction, requiring monitor scale factor adjustments.

• Why is an 11 mm probe used instead of 8 mm?

  The 11 mm probe provides a larger linear range, making it suitable for applications with wider shaft orbits or low-frequency oscillation measurement.

• How is the probe output verified?

  DC gap voltage is measured at the monitor card input pins; readings outside the linear range indicate potential target contact or probe failure.

• Can I use this with a non-XL Proximitor?

  No. XL series probes are electrically optimized for XL-compatible Proximitors; mismatching leads to significant linearity and accuracy errors.

• How is electrical isolation maintained?

  The TipLoc design isolates the sensor tip from the stainless steel housing, preventing ground loop formation in the sensing loop.

• What causes a reading at the negative power rail?

  A reading at the supply voltage limit indicates an open-circuit failure, typically caused by a damaged coaxial cable or loose connector.

• Is the probe pressure-tight?

  The probe assembly is designed to be pressure-tight when installed with appropriate thread sealants, allowing for use in bearing housings.