Configured for radial vibration and axial position measurement in rotating machinery, the Bently Nevada 330130-070-00-CN (330130-070-00-CN Proximity Probe) provides direct physical execution of displacement sensing via eddy-current induction.

Model Suffix Classification

The 330130-070-00-CN is defined by the following configuration parameters:

• 330130: 3300 XL 8mm Proximity Probe.

• 070: 7.0 meters cable length (integral).

• 00: Connector type (Standard).

• CN: Agency approval (China specific).

Physical and Electrical Specifications

Eddy-Current Probe Scaling and Signal Validation

The 3300 XL probe operates by generating an electromagnetic field that induces eddy currents in the target surface. The Proximitor sensor monitors the loading effect of these currents to determine the gap distance. Precise gap voltage validation is required to ensure system linearity; the standard target for mid-range operation is -10 VDC. Deviations from this voltage during static bench testing indicate improper installation gap or target material non-conformity. Proper rotor dynamics analysis relies on the consistency of this scaling factor across the entire linear range.

Ordering Information

• 1 x 330130-070-00-CN 8mm Proximity Probe

• 1 x Threaded probe housing nut

• 1 x Calibration data sheet

• 1 x Connector protective cap

Site Installation Guidelines

• Proximity Mounting: Ensure the probe is mounted in a rigid, non-conductive bracket if possible, or ensure the mounting location does not interfere with the electromagnetic field.

• Gap Setting: Use a feeler gauge to establish the initial installation gap, followed by a final electrical validation of -10 VDC gap voltage at the monitor output.

• Cable Management: Maintain a minimum bend radius of 25 mm to preserve the coaxial cable impedance.

• Grounding: Ensure the probe shield is continuous and grounded at the monitor interface to prevent ground loops.

Technical Inquiry Clarifications

• Q: Can the probe cable be field-spliced?

  A: No. Any splicing changes the impedance of the coaxial cable, which directly alters the eddy-current scaling and renders the measurement inaccurate.

• Q: What is the purpose of the 8mm tip?

  A: The 8mm diameter is optimized for a 2mm linear measurement range, balancing probe sensitivity with mechanical robustness.

• Q: Is the tip material conductive?

  A: The tip is constructed from high-temperature engineering plastic, while the internal coil is copper. The tip does not conduct current to the target.

• Q: How often should the probe be recalibrated?

  A: Probes do not require periodic calibration if the installation gap remains stable and the target material composition is unchanged.

• Q: Can I use this probe with a 3300 series (non-XL) Proximitor?

  A: No. The 3300 XL probe and Proximitor are impedance-matched as a system; using non-XL components will result in significant signal errors.

• Q: What happens if the gap exceeds the linear range?

  A: The output voltage will saturate or drift non-linearly, making vibration data unreliable for machine protection.

• Q: Is the housing grounded to the machine case?

  A: The probe housing is typically grounded to the machine case via the mounting threads. Ensure no paint or scale inhibits electrical contact.

• Q: Why is the -10 VDC gap voltage important?

  A: It centers the probe's operation within the linear region of the Proximitor's response curve, ensuring 1:1 signal tracking of target movement.