Configured for shaft displacement monitoring in mechanical platforms, the Bently Nevada 330907-05-30-10-02-CN (330907-05-30-10-02-05 Reverse Mount Probe) provides direct physical/electrical execution of non-contacting position signal conditioning.

Suffix Model Decomposition

• 330907: Base Model (3300 NSv Reverse Mount Proximity Probe)

• 05: Probe Length (0.5 mm)

• 30: Case Length (30 mm)

• 10: Total System Length (1.0 meter)

• 02: Connector Type (Miniature coaxial ClickLoc connector)

• CN: Agency Approval (China Certification/Standard)

Hardware Specifications

TSI Mechanical Monitoring & Dynamics

The 3300 NSv reverse mount probe uses eddy-current probe scaling to convert target shaft displacement into a linearized voltage output. During site commissioning, gap voltage validation against -10 VDC targets at the oscillator output ensures the probe operates within the specified linear measurement range. Rotor dynamics are monitored by detecting high-frequency shaft position variations. Cross-talk suppression is achieved through oscillator frequency modulation, which prevents interference between adjacent proximity sensors in high-density rack configurations.

Ordering Info

• 1 x 330907-05-30-10-02-CN Reverse Mount Proximity Probe

• 1 x Protective connector thread cap

• 1 x Installation technical documentation

Installation Guidelines

• Mechanical Mounting: Mount the reverse probe through the machine casing using the integral mounting thread; verify the physical air gap with a feeler gauge to achieve the -10 VDC target.

• Cabling: Use factory-terminated coaxial cables; route through rigid grounded conduit to minimize electromagnetic noise pickup.

• Grounding: Secure the probe body to the machine ground reference to maintain a stable electrical path for the eddy-current field.

• Signal Check: Use a high-impedance multimeter to verify the static gap voltage at the oscillator interface before initiating machine rotation.

• Connector Maintenance: Ensure coaxial connectors remain clean, dry, and hand-tightened to prevent signal instability.

Frequently Asked Questions

• Q: Is the 330907 probe compatible with standard 3300 XL oscillator modules?

  A: No, the 3300 NSv system requires a dedicated NSv oscillator to maintain correct system impedance, scaling, and frequency response characteristics.

• Q: How do I determine the correct probe air gap?

  A: The correct air gap is determined by monitoring the DC gap voltage at the oscillator output; the nominal target is -10 VDC within the linear range.

• Q: Can the coaxial cable be shortened or extended in the field?

  A: No, field modification of the cable alters the system's resonant frequency and impedance, which degrades measurement accuracy and invalidates factory calibration.

• Q: What is the effect of different target materials?

  A: Probe sensitivity is factory-calibrated for 4140 steel; other materials require a correction factor adjustment to maintain displacement reading accuracy.

• Q: What is the function of the connector protective cap?

  A: The cap prevents environmental contamination, moisture, or particulate ingress into the coaxial interface during installation or storage.

• Q: Does this probe require an external power supply?

  A: No, it is a passive transducer; excitation energy is provided by the high-frequency RF carrier signal generated by the NSv oscillator.

• Q: What causes unstable or drifting signal readings?

  A: Signal drift is typically caused by loose coaxial connections, improper grounding of the probe body, or physical damage to the probe tip/cable.

• Q: Is it necessary to use thread-locking compounds?

  A: No, thread-locking compounds may introduce an electrical insulation barrier that interferes with the ground path between the probe and machine housing.