330905-00-25-05-01-CN | Bently Nevada | 3300 NSv Proximity Probe

Configured for non-contacting vibration and position monitoring in rotating machinery, the Bently Nevada 330905-00-25-05-01-CN (330905 Proximity Probe) provides direct physical signal transduction within 3300 NSv systems.

Suffix Breakdown & Model Matrix

Hardware Specifications

Eddy-Current Probe Scaling and Gap Voltage Validation

The 3300 NSv transducer system operates on the principle of eddy-current induction to measure shaft displacement. Accurate operation requires a nominal -10 VDC gap voltage when the probe is positioned at the center of its linear range. Deviation from this target gap voltage, or failure to maintain the 7.87 V/mm (200 mV/mil) sensitivity profile, directly impacts the integrity of rotor dynamics data acquisition. Maintenance personnel must ensure the target material is non-ferrous or specifically calibrated for the probe frequency to prevent non-linear output response.

Frequently Asked Questions

Q: Does the inclusion of a connector protector affect signal impedance?

A: No. The connector protector is a mechanical housing designed to prevent fluid ingress and physical damage to the ClickLoc connection and does not alter the 75 Ohm characteristic impedance of the coaxial cable.

Q: Can this probe be used in high-vibration applications?

A: Yes. The probe is engineered for machinery environments, provided the probe body is rigidly mounted using the M10 x 1 thread and the cable is secured to prevent resonant excitation.

Field Installation Guidelines

• Mounting Requirements: Install the probe into a rigid bracket to ensure the tip remains perpendicular to the target shaft. Use appropriate lock nuts to secure the setting once the -10 VDC gap voltage is achieved.
• Cable Routing: Maintain a clear path for the 0.5 meter coaxial cable. Avoid sharp bends that exceed the minimum bend radius of the FEP-insulated cable to prevent dielectric degradation.
• Grounding: Ensure that the system grounding is consistent with the 3300 NSv documentation to prevent ground loops, which can appear as low-frequency electrical noise in the vibration spectrum.
• Environment: Ensure the ambient temperature at the probe tip does not exceed +177 deg C to maintain material integrity of the PPS tip and internal potting compounds.