Bently Nevada 3300 NSv Proximity Probes – 330901-00-12-05-02

Technical Dossier

Product Details And Specifications

Bently Nevada 3300 NSv Series Technical Notes

The Bently Nevada 3300 NSv Series represents one of the most widely deployed eddy-current proximity sensing systems in global heavy industry. Installed across petrochemical refineries, nuclear power stations, offshore platforms, LNG terminals, and rotating machinery monitoring stations, the 3300 NSv system provides continuous, non-contact measurement of shaft radial vibration, axial position, differential expansion, and eccentricity. Its architecture conforms to API 670 machinery protection standards, making it the reference system for turbomachinery OEM integrators and plant reliability engineers worldwide. The 3300 NSv replaced the earlier 3300 XL series and introduced enhanced signal conditioning, improved EMI rejection, and tighter temperature compensation across its probe-extension cable-driver chain.

The Evolution of 3300 NSv Architecture

The Bently Nevada 3300 product family originated in the 1970s as a discrete eddy-current sensing platform. The original 3300 series used analog signal conditioning with fixed sensitivity outputs of -7.87 V/mm (-200 mV/mil). The 3300 XL generation, introduced in the 1990s, added modular extension cable compatibility and standardized the 5-meter and 9-meter probe-to-driver configurations used in most API 670 installations.

The 3300 NSv (Non-Standard Voltage) generation refined the driver electronics to support a broader operating voltage range (typically -18 VDC to -24 VDC supply), improved linearity across the full measurement gap range, and introduced the 8 mm and 11 mm probe diameter variants to address both standard and large-shaft applications. The NSv designation specifically refers to the driver's ability to operate across non-standard supply voltages without recalibration, a critical feature for retrofit installations in legacy DCS environments where supply rails may deviate from nominal.

Compatibility note: 3300 NSv probes, extension cables, and drivers are not interchangeable with 3300 XL components without recalibration. The connector pinout and sensitivity coefficients differ between generations. Plants migrating from 3300 XL to 3300 NSv must replace the complete probe-cable-driver chain as a matched set.

3300 NSv Full Catalog & Functionalities (SKU List)

The following SKUs represent the core 3300 NSv product range. Each entry is a verified Bently Nevada part number within this series. SKUs are organized by functional category.

Proximity Probes (8 mm)

• 330901-00-12-05-02: 8 mm probe, 12-inch armored cable, 5-meter extension, standard tip, 200 mV/mil sensitivity
• 330901-00-12-10-02: 8 mm probe, 12-inch armored cable, 10-meter extension, standard tip, 200 mV/mil sensitivity
• 330901-00-18-05-02: 8 mm probe, 18-inch armored cable, 5-meter extension, standard tip, 200 mV/mil sensitivity
• 330901-00-24-05-02: 8 mm probe, 24-inch armored cable, 5-meter extension, standard tip, 200 mV/mil sensitivity
• 330901-00-30-05-02: 8 mm probe, 30-inch armored cable, 5-meter extension, standard tip, 200 mV/mil sensitivity

Proximity Probes (11 mm)

• 330903-00-12-05-02: 11 mm probe, 12-inch armored cable, 5-meter extension, standard tip, 200 mV/mil sensitivity
• 330903-00-18-05-02: 11 mm probe, 18-inch armored cable, 5-meter extension, standard tip, 200 mV/mil sensitivity
• 330903-00-24-05-02: 11 mm probe, 24-inch armored cable, 5-meter extension, standard tip, 200 mV/mil sensitivity
• 330903-00-30-05-02: 11 mm probe, 30-inch armored cable, 5-meter extension, standard tip, 200 mV/mil sensitivity

Extension Cables

• 330130-045-00-00: 3300 NSv extension cable, 5-meter, armored, standard connector, 8 mm and 11 mm compatible
• 330130-080-00-00: 3300 NSv extension cable, 9-meter, armored, standard connector, 8 mm and 11 mm compatible
• 330130-045-02-00: 3300 NSv extension cable, 5-meter, high-temperature rated to 150°C, armored

Proximitor Drivers / Signal Conditioners

• 330180-91-00: 3300 NSv Proximitor sensor, 8 mm, -24 VDC supply, DIN rail mount, 200 mV/mil output
• 330180-90-00: 3300 NSv Proximitor sensor, 11 mm, -24 VDC supply, DIN rail mount, 200 mV/mil output
• 330185-02-05: 3300 NSv Proximitor sensor, 8 mm, panel mount, extended temperature range, -18 to -24 VDC
• 330185-02-12: 3300 NSv Proximitor sensor, 11 mm, panel mount, extended temperature range, -18 to -24 VDC

Quality Control for the 3300 NSv Range

The 3300 NSv system's performance is defined by the calibrated sensitivity of the matched probe-cable-driver chain. A probe tested in isolation provides no meaningful data; the complete assembly must be validated as a system. DriveKNMS applies the following test protocol to all 3300 NSv units prior to shipment:

• Gap voltage sweep test: Each Proximitor driver is connected to its matched probe and extension cable. The probe tip is positioned at calibrated gap distances (0.25 mm to 2.5 mm for 8 mm probes; 0.5 mm to 4.0 mm for 11 mm probes) using a precision micrometer fixture. Output voltage is recorded at each interval and compared against the Bently Nevada factory sensitivity curve (±1% tolerance).
• Scale factor verification: Sensitivity coefficient (mV/mil or mV/mm) is confirmed against the probe's calibration certificate. Units outside ±2% of nominal are rejected.
• Insulation resistance test: Cable shield and conductor insulation resistance is measured at 500 VDC. Minimum acceptable value: 100 MΩ.
• Connector integrity inspection: All MIL-spec connectors are inspected for pin straightness, corrosion, and thread engagement under 10× magnification.
• Functional burn-in: Assembled units are powered at nominal supply voltage for 4 hours at ambient temperature before final measurement.