Bently Nevada 3300 NSv Proximity Probes: 330908-22-31-10-01-05

Technical Dossier

Product Details And Specifications

Bently Nevada 3300 NSv Series Technical Notes

The Bently Nevada 3300 NSv (Non-contacting Vibration) Proximity Probe System is one of the most widely deployed eddy-current sensing platforms in global heavy industry. Installed across petrochemical refineries, nuclear power stations, LNG terminals, offshore platforms, and rotating machinery facilities, the 3300 NSv system provides continuous, non-contact measurement of shaft radial vibration, axial position, and differential expansion. Its architecture is fully compatible with the Bently Nevada 3300 Series monitors and integrates directly into DCS environments via standard 4–20 mA and voltage output signals. The system's long-term field reliability has made it the de facto standard for API 670-compliant machinery protection on critical rotating assets including steam turbines, gas compressors, centrifugal pumps, and gearboxes.

The Evolution of 3300 NSv Architecture

Over successive generations, the 3300 NSv platform expanded its conductor configurations (8 mm, 11 mm, 14 mm tip diameters), cable lengths (from 0.5 m to 9 m standard, with custom extensions), and temperature ratings (standard to -40°C / +177°C). The system maintains backward compatibility with 3300 Series monitors, ensuring that facilities running legacy Bently Nevada infrastructure can source replacement probes without monitor recalibration. As the broader 3300 platform has entered its mature/end-of-active-production phase, long-term maintenance support and certified refurbished inventory have become the primary sourcing strategy for asset-intensive operators.

3300 NSv Full Catalog & Functionalities (SKU List)

The following SKUs represent the core 3300 NSv proximity probe catalog, organized by configuration. Each entry reflects a distinct combination of tip diameter, cable length, connector type, and temperature rating.

Proximity Probe Bodies

• 330908-22-31-10-01-05: 8 mm probe, 1 m armored cable, standard temp, reverse-mount, 5 m extension compatible — the subject SKU of this page.
• 330908-22-31-10-01-00: 8 mm probe, 1 m armored cable, standard temp, no extension, direct proximitor connection.
• 330908-22-31-10-02-05: 8 mm probe, 2 m armored cable, standard temp, reverse-mount, 5 m extension.
• 330908-22-31-10-05-05: 8 mm probe, 5 m armored cable, standard temp, reverse-mount, 5 m extension.
• 330908-22-31-10-09-05: 8 mm probe, 9 m armored cable, standard temp, reverse-mount, 5 m extension.
• 330908-22-31-10-01-10: 8 mm probe, 1 m armored cable, standard temp, reverse-mount, 10 m extension.
• 330908-22-31-10-05-10: 8 mm probe, 5 m armored cable, standard temp, reverse-mount, 10 m extension.
• 330908-22-31-10-09-10: 8 mm probe, 9 m armored cable, standard temp, reverse-mount, 10 m extension.

High-Temperature Probe Variants

• 330908-22-31-10-01-05-HT: 8 mm probe, 1 m cable, high-temp rating to +177°C, 5 m extension, for hot-section turbine applications.
• 330908-22-31-10-05-05-HT: 8 mm probe, 5 m cable, high-temp, 5 m extension, steam turbine bearing housings.

Extension Cables

• 330130-080-00-00: 8 m extension cable, standard temp, armored, for 3300 NSv probe-to-proximitor runs.
• 330130-050-00-00: 5 m extension cable, standard temp, armored, most common field configuration.
• 330130-100-00-00: 10 m extension cable, standard temp, armored, long-distance installations.

Proximitor Modules (Signal Conditioners)

• 330180-91-00: 3300 NSv Proximitor, 8 mm system, DIN rail mount, 24 VDC, 4–20 mA output, standard configuration.
• 330180-91-05: 3300 NSv Proximitor, 8 mm system, panel mount, 24 VDC, voltage output, for legacy monitor integration.
• 330180-91-CN: 3300 NSv Proximitor, 8 mm system, conformal-coated PCB, for high-humidity offshore environments.

Mounting Hardware & Accessories

• 330905-00-00-00: Probe mounting bracket, stainless steel, adjustable, for 8 mm 3300 NSv probes.
• 330910-00-00-00: Probe tip guard, 8 mm, for transport and installation protection.

Sourcing Hard-to-Find & Obsolete 3300 NSv Parts

The Bently Nevada 3300 NSv platform has entered its mature lifecycle phase. Baker Hughes (the current owner of the Bently Nevada brand) has progressively shifted active production toward the 3500 Series and Orbit 60 platforms. As a result, a significant portion of the 3300 NSv catalog — including specific cable length configurations, high-temperature variants, and legacy proximitor models — is no longer available through standard OEM distribution channels.

Quality Control for the 3300 NSv Range

The 3300 NSv system's performance is defined by the calibrated linearity of the eddy-current sensing chain across the full probe-cable-proximitor assembly. DriveKNMS applies a dedicated test protocol for all 3300 NSv components:

• Gap voltage linearity test: Each probe-proximitor pair is tested across the full sensing range (0–2 mm for 8 mm probes) using a calibrated steel target. Output linearity must meet ±0.5% of full-scale specification.
• Cable continuity and insulation resistance: Extension cables are tested for conductor continuity, shield integrity, and insulation resistance (>100 MΩ at 500 VDC) to eliminate intermittent field failures.
• Proximitor output verification: DC output voltage and 4–20 mA signal are verified at three gap positions (near, mid, far) against Bently Nevada factory calibration curves.
• High-temperature variant soak test: HT-rated probes undergo a 4-hour thermal soak at 150°C prior to final gap calibration to confirm dimensional stability of the probe tip and cable termination.
• Connector and thread inspection: All probe bodies are inspected for thread condition (M10×1 standard), connector pin integrity, and armored cable jacket condition before packaging.