330905-00-25-05-12-CN 3300 NSv Proximity Probe | Bently Nevada

Configured for small-shaft vibration and position monitoring, the Bently Nevada 330905-00-25-05-12-CN (330905 Proximity Probe) provides direct physical signal transduction for 3300 NSv transducer systems.

Suffix Breakdown & Model Matrix

Hardware Specifications

Gap Voltage Validation and Cross-Talk Suppression

The 3300 NSv system requires precise gap voltage validation to ensure accurate signal transduction. The probe operates with a target -10 VDC gap voltage when positioned at the center of the linear operating range. Maintenance personnel must verify this output using a digital voltmeter to confirm that the transducer system is centered relative to the shaft target. Furthermore, when installing multiple probes in proximity for phase reference or X-Y radial vibration measurements, maintain minimum separation distances to ensure effective cross-talk suppression. Failure to observe these spacing requirements may introduce frequency interference and signal noise into the rotor dynamics data stream.

Frequently Asked Questions

Q: Is the FluidLoc cable compatible with existing extension cables from the 3300 XL system?

A: No. The 3300 NSv system is specifically calibrated for the NSv probe and cable characteristics. Mixing components from the standard 3300 XL transducer system will invalidate the 7.87 V/mm (200 mV/mil) system sensitivity and introduce measurement errors.

Q: Can the M10 x 1 thread be used for bulkhead mounting?

A: Yes, provided the mounting bracket is rigid. Ensure the thread is not over-torqued during installation to prevent mechanical deformation of the probe case, which could affect the internal sensing coil integrity.

Field Installation Guidelines

• Mounting Stability: Secure the probe into a rigid bracket using the provided lock nuts. Ensure the tip is positioned at the required gap distance from the target shaft surface to achieve the nominal -10 VDC gap voltage.
• Cable Handling: Use the ClickLoc connector mechanism to establish the signal path. Do not pull on the cable to disconnect; depress the locking sleeve to release.
• Shielding: Route the coaxial cable away from high-voltage wiring or EMI sources. Ground the system shield at the monitor rack terminal block to maintain a clean common reference.
• Fluid Protection: While the FluidLoc cable mitigates internal wicking, ensure the external connections are protected within appropriate conduit or NEMA-rated junction boxes if the area is subject to fluid spray or condensation.