Bently Nevada NSv Proximity Probes – 330903-00-05-10-01-05

Technical Dossier

Product Details And Specifications

Bently Nevada NSv Proximity Probes Series Technical Notes

The Bently Nevada NSv Proximity Probes series represents one of the most widely deployed non-contacting vibration measurement technologies in global heavy industry. Installed across petrochemical complexes, nuclear power stations, offshore platforms, and refinery rotating equipment trains, the NSv series provides continuous shaft displacement and vibration monitoring as a core input to machinery protection systems. The series interfaces directly with Bently Nevada 3500 and 3300 series monitoring racks, making it a foundational component in plant-wide condition monitoring architectures. Its eddy-current operating principle delivers sub-micron resolution without physical contact with the rotating shaft, enabling continuous operation in high-temperature, high-pressure, and chemically aggressive environments where conventional sensors fail.

The Evolution of NSv Architecture

Bently Nevada's proximity probe technology originated in the 1960s with the introduction of the 3000 series eddy-current probes, which established the 5 mm and 8 mm tip diameter form factors that remain industry standards today. The NSv (Non-contacting vibration) designation emerged as Bently Nevada standardized its probe-extension-driver cable assemblies into matched system sets, ensuring consistent sensitivity (typically 7.87 mV/µm or 200 mV/mil) across the full measurement chain. Early NSv probes used a 3-wire coaxial cable architecture with a fixed 1-meter or 5-meter integral cable, requiring field splicing for longer runs. The introduction of the extension cable system (330130 series) decoupled probe length from driver distance, enabling installations up to 9 meters total system length. The transition from the 3300 XL series drivers to the 3500/40M and 3500/42M rack-mounted monitors brought digital signal conditioning, reducing sensitivity to EMI in high-voltage switchgear environments. Current NSv probes maintain backward compatibility with legacy 3300 series drivers, a critical factor for brownfield plant maintenance where full system replacement is cost-prohibitive. The series is now in a mature/sustaining lifecycle phase; Bently Nevada (a Baker Hughes company) continues to supply replacement probes but has directed new installations toward the System 1 Evolution platform with integrated wireless capabilities.

NSv Proximity Probes Full Catalog & Functionalities (SKU List)

The following SKUs represent the core NSv Proximity Probe catalog, organized by tip diameter, cable length, and connector configuration. Each model is a matched-system component; substitution outside matched sets will alter system sensitivity and invalidate calibration.

330903-00-05-10-01-05: 5 mm probe, 0.5 m cable, 3/8-24 UNF thread, standard temperature, 200 mV/mil sensitivity — the subject listing SKU.
330903-00-05-10-00-05: 5 mm probe, 0.5 m cable, 3/8-24 UNF thread, standard temperature, no connector, bare lead termination.
330903-00-05-10-01-10: 5 mm probe, 1.0 m cable, 3/8-24 UNF thread, standard temperature, standard connector.
330903-00-05-10-01-50: 5 mm probe, 5.0 m cable, 3/8-24 UNF thread, standard temperature, standard connector.
330903-00-08-10-01-05: 8 mm probe, 0.5 m cable, M10 thread, standard temperature, standard connector, higher gap range.
330903-00-08-10-01-10: 8 mm probe, 1.0 m cable, M10 thread, standard temperature, standard connector.
330903-00-08-10-01-50: 8 mm probe, 5.0 m cable, M10 thread, standard temperature, standard connector.
330903-00-05-05-01-05: 5 mm probe, 0.5 m cable, 3/8-24 UNF thread, high-temperature variant (up to 177°C), standard connector.
330903-00-05-05-01-10: 5 mm probe, 1.0 m cable, 3/8-24 UNF thread, high-temperature variant, standard connector.
330903-00-08-05-01-05: 8 mm probe, 0.5 m cable, M10 thread, high-temperature variant, standard connector.
330903-00-08-05-01-10: 8 mm probe, 1.0 m cable, M10 thread, high-temperature variant, standard connector.
330905-00-05-10-01-05: 5 mm probe, 0.5 m cable, metric M8 thread, standard temperature, 200 mV/mil, for metric bearing housings.
330905-00-08-10-01-05: 8 mm probe, 0.5 m cable, metric M12 thread, standard temperature, for large-bore metric installations.
330130-080-00-00: NSv extension cable, 8.0 m, used to extend probe-to-driver distance in the matched system.
330180-51-05: 3300 NSv driver module, DIN-rail mount, 5 mm probe input, 24 VDC supply, paired with 330903 5 mm probes.
330180-51-08: 3300 NSv driver module, DIN-rail mount, 8 mm probe input, 24 VDC supply, paired with 330903 8 mm probes.
330850-50-00: 3500/40M proximitor I/O module, rack-mount, accepts NSv probe signals for 3500 series monitoring systems.