Bently Nevada 330904-00-12-10-02-05/CN Proximity Probe – 3300 NSv Series

Bently Nevada 330904-00-12-10-02-05/CN — Eddy-Current Proximity Probe for Continuous Shaft Displacement Monitoring

The 330904-00-12-10-02-05/CN is a 25 mm-body, non-contacting eddy-current proximity probe with a 5-metre factory-terminated integral cable, manufactured by Bently Nevada as part of the 3300 NSv (Non-Standard Voltage) Series. It functions as the primary sensing element in a three-component measurement chain — probe, extension cable, and Proximitor® driver — delivering a DC voltage output proportional to the gap between the probe tip and a conductive target surface. The output sensitivity is nominally −7.87 V/mm (−200 mV/mil) when used with the matched 3300 NSv Proximitor®, providing a linear measurement range of approximately 0.25 mm to 2.26 mm (10 mil to 89 mil) gap.

In a rotating-machinery protection architecture, this probe is mounted radially or axially against a shaft journal or thrust collar. The Proximitor® converts the probe’s impedance change — caused by eddy-current losses induced in the target — into a buffered voltage signal that feeds directly into a Bently Nevada 3500 Series rack or equivalent machinery protection monitor. The monitor then applies alarm and trip logic based on peak-to-peak vibration amplitude (µm or mil), DC gap voltage (position), and 1X/2X vector components extracted by the System 1 software suite. The 330904-00-12-10-02-05/CN is therefore not a standalone sensor; it is a precision transducer whose accuracy is inseparable from the calibrated chain it belongs to.

The part-number suffix structure encodes the physical configuration: 330904 identifies the 3300 NSv probe family; 00 denotes standard armored cable jacket; 12 specifies the 25 mm (1-inch) probe body diameter; 10 indicates the probe tip-to-body length; 02 defines the connector type; 05 sets the integral cable length at 5 metres; and /CN marks the China-market compliance variant. Substituting any suffix segment with a non-identical value changes the calibration constants and invalidates the measurement chain certification — a critical consideration for API 670-compliant installations.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

The eddy-current proximity probe operates on Faraday’s law of electromagnetic induction. The probe coil, driven by a high-frequency oscillator inside the Proximitor® (typically 1.0 MHz carrier), generates an alternating magnetic field that penetrates the conductive target surface. Eddy currents induced in the target dissipate energy proportional to the target’s electrical conductivity, magnetic permeability, and the gap distance. This energy loss manifests as a change in the coil’s effective impedance, which the Proximitor® demodulates into a DC voltage output.

The 5-metre integral cable in the 330904-00-12-10-02-05/CN is a coaxial assembly with controlled characteristic impedance. The cable’s distributed capacitance and inductance are factory-characterized and compensated within the Proximitor® calibration. This is why the probe and its integral cable are sold and calibrated as a matched pair — field-splicing or substituting the cable introduces uncompensated impedance discontinuities that shift the sensitivity curve by up to ±5%, which is unacceptable in API 670 protection applications where alarm setpoints are typically set at 125 µm (5 mil) peak-to-peak.

The 25 mm probe body diameter determines the effective sensing area and, consequently, the depth of the eddy-current field penetration into the target. A larger probe body produces a wider, more uniform field distribution, which reduces sensitivity to surface finish irregularities and runout artifacts on the shaft. For a 25 mm probe, the recommended minimum shaft diameter is approximately 50 mm (2 inches) to avoid field-edge effects that introduce nonlinearity at the extremes of the measurement range.

EMC performance is achieved through the coaxial cable’s continuous shield, which is grounded at the Proximitor® end only (single-point grounding). This topology prevents ground-loop currents from modulating the signal. The stainless steel armor provides mechanical protection and an additional Faraday shield against radiated RF interference — relevant in environments with variable-frequency drives (VFDs) operating in the 2–20 kHz switching frequency range, which can couple into unshielded sensor cables and produce false vibration readings.

System Integration Benefits

• Direct API 670 compliance path: When installed as part of a certified 3300 NSv chain (probe + extension cable + Proximitor®), the measurement system meets the accuracy and reliability requirements of API 670 Fifth Edition for machinery protection on critical rotating equipment.
• Zero mechanical wear: Non-contacting measurement eliminates probe-to-shaft contact, removing any wear mechanism from the sensing element. Mean time between replacement is determined by environmental degradation of the cable jacket, not by mechanical fatigue.
• Deterministic frequency response to 10 kHz: The flat frequency response from DC to 10,000 Hz captures shaft dynamic events including subsynchronous instability (oil whirl/whip at 0.3–0.5× running speed), synchronous 1X unbalance, and supersynchronous blade-pass frequencies on compressors with up to 20 impeller vanes at 3,000 RPM.
• DC gap monitoring for axial position and eccentricity: The DC component of the output voltage provides continuous shaft centerline position data, enabling detection of bearing wear (increasing eccentricity ratio) and thermal growth of the rotor without additional instrumentation.
• Plug-compatible replacement within 3300 NSv chains: Identical part-number substitution requires no recalibration of the Proximitor® or monitor — the factory-matched sensitivity is preserved, reducing maintenance downtime to the time required for physical probe replacement and gap setting.
• Compatibility with Bently Nevada System 1 software: The analog output feeds directly into 3500 Series I/O modules, and the vector data (1X, 2X amplitude and phase) is available to System 1 for trend analysis, orbit plot generation, and predictive maintenance alarming without additional signal conditioning.
• Wide operating temperature range (−35 °C to +177 °C): Covers the full range of industrial deployment scenarios from outdoor installations in northern climates to probe mounting adjacent to high-temperature bearing housings on steam turbines.
• Stainless steel armor and chemical-resistant jacket: The cable assembly withstands continuous exposure to lubricating oil, hydraulic fluid, and cleaning solvents without jacket degradation, maintaining insulation resistance above the minimum threshold required for accurate measurement.

Quality Assurance & Global Logistics

Every 330904-00-12-10-02-05/CN unit supplied by siemensplc.com is sourced through verified channels with full traceability to Bently Nevada’s manufacturing and distribution network. Prior to dispatch from our Xiamen, China facility, each unit undergoes a structured incoming inspection protocol: physical integrity check of the probe body, connector, and cable jacket; continuity and insulation resistance measurement of the coaxial cable; and verification of part-number markings against the purchase documentation.

Units are packaged in anti-static, shock-absorbing enclosures with moisture-barrier sealing — consistent with the handling requirements for precision electronic transducers during international air and sea freight. Available documentation includes certificate of conformance, original manufacturer packaging, and test records where provided by the supply chain. For projects requiring third-party inspection or witnessed testing, coordination with SGS, Bureau Veritas, or equivalent inspection bodies can be arranged at the buyer’s request.

Logistics from Xiamen covers all major international destinations via DHL Express, FedEx International Priority, and consolidated sea freight for volume orders. Standard air freight transit times are 3–5 business days to Europe, 2–4 business days to Southeast Asia, and 4–7 business days to North America. Export documentation — commercial invoice, packing list, certificate of origin, and HS code declaration — is prepared as standard for every shipment. DDP, DAP, and EXW Incoterms are all supported based on buyer preference.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
© 2026 siemensplc.com. All rights reserved.

{
“@context”: “https://schema.org”,
“@type”: “Product”,
“name”: “Bently Nevada 330904-00-12-10-02-05/CN Proximity Probe | 3300 NSv 25mm 5m Integral Cable”,
“description”: “Bently Nevada 330904-00-12-10-02-05/CN is a 25mm non-contacting eddy-current proximity probe with 5m integral cable, 3300 NSv Series, for turbomachinery shaft vibration and displacement monitoring. API 670 compliant.”,
“sku”: “330904-00-12-10-02-05/CN”,
“brand”: {“@type”: “Brand”, “name”: “Bently Nevada”},
“manufacturer”: {“@type”: “Organization”, “name”: “Bently Nevada”},
“category”: “Proximity Probe / Vibration Sensor”,
“offers”: {
“@type”: “Offer”,
“priceCurrency”: “USD”,
“availability”: “https://schema.org/InStock”,
“seller”: {“@type”: “Organization”, “name”: “siemensplc.com”, “url”: “https://siemensplc.com”}
}
}