Bently Nevada 330905-00-12-05-01-00 Proximity Transducer System – 3300 XL Series

Bently Nevada 330905-00-12-05-01-00 — Eddy-Current Proximity Transducer System for Critical Rotating Machinery

The 330905-00-12-05-01-00 is a matched-set proximity transducer system within Bently Nevada’s 3300 XL product family, designed for continuous, non-contact measurement of radial shaft vibration and axial position displacement on rotating machinery. The system operates on the eddy-current induction principle: a high-frequency oscillator (typically 1.0 MHz) drives the probe tip coil, generating an electromagnetic field that induces eddy currents in the conductive target surface. As the shaft-to-probe gap changes, the energy absorbed by the target alters the oscillator’s damping coefficient, producing a DC output voltage that is linearly proportional to the gap distance. This mechanism delivers sub-micron resolution without any mechanical contact with the rotating element, eliminating wear-induced drift over the service life of the installation.

The 330905-00-12-05-01-00 configuration specifies an 8 mm probe tip diameter, a 5-metre extension cable, and a 3300 XL Proximitor sensor module. The Proximitor performs the oscillator, demodulator, and signal conditioning functions, outputting a calibrated -24 VDC nominal signal at the standard Bently Nevada sensitivity of -7.87 V/mm (−200 mV/mil). This output is directly compatible with all 3300 and 3500 series monitor rack inputs, requiring no intermediate signal conversion or re-ranging when used as a direct replacement in existing installations.

In turbomachinery protection architectures, this transducer system is typically deployed in pairs at each radial bearing plane — oriented 90° apart (X and Y axes) — to resolve the full orbital trajectory of the shaft centerline. Axial position variants of the same family are used at thrust bearing locations to detect collar wear or axial float beyond API 670 alarm and danger thresholds. The 330905-00-12-05-01-00 is rated for continuous operation across the full API 670 frequency band from DC to 10,000 Hz, capturing both synchronous (1X) and sub-synchronous instability events such as oil whirl and surge precursors.

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

Technical Parameters

Hardware Logical Analysis

The 3300 XL architecture separates the probe, extension cable, and Proximitor into three electrically matched components. This matched-set design is not arbitrary: the coaxial cable’s distributed capacitance and inductance form part of the oscillator tank circuit. Substituting a cable of different length or impedance characteristic shifts the resonant frequency of the oscillator, degrading linearity and scale factor accuracy. The 330905-00-12-05-01-00 specifies a 5-metre cable, which is factory-trimmed and verified against the probe and Proximitor to maintain the published −7.87 V/mm sensitivity within ±1% across the full linear range.

The Proximitor’s internal oscillator operates at approximately 1.0 MHz. At this frequency, the skin depth in AISI 4140 steel is roughly 8 µm — shallow enough that the eddy-current field is entirely confined to the shaft surface layer, making the measurement insensitive to shaft material homogeneity below the surface. This is a deliberate design choice that ensures consistent calibration across shafts with varying heat treatment profiles, provided the surface finish and material grade meet the API 670 target specification.

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 path — a common failure mode in installations where both cable ends are grounded to separate structural steel members at different potentials. The Proximitor housing is constructed from 316L stainless steel with an IP66 seal, providing immunity to high-pressure wash-down, condensation ingress, and the hydrocarbon mist environments typical of compressor train enclosures.

The output stage of the Proximitor is a low-impedance voltage source (output impedance < 100 Ω), capable of driving cable runs up to 300 metres to the monitor rack without signal attenuation. This allows the Proximitor to be mounted close to the bearing housing — minimising the probe cable length and its associated susceptibility to mechanical damage — while the monitor rack is located in a climate-controlled control room at a significant distance from the machine.

System Integration Benefits

• Direct API 670 Compliance: The 330905-00-12-05-01-00 meets the transducer performance requirements of API Standard 670 (5th Edition) for machinery protection systems, enabling use in new installations without additional qualification testing.
• Zero-Recalibration Replacement: As a factory-matched set with a documented scale factor, this unit replaces a failed 3300 XL transducer system without requiring re-ranging of the associated monitor channel — critical for minimising machine downtime during maintenance windows.
• Deterministic DC-Coupled Output: The DC-coupled output preserves static gap information alongside dynamic vibration data, allowing the monitor to simultaneously track shaft average position (SAP) and dynamic vibration amplitude within a single channel — a capability not available with AC-coupled sensor technologies.
• Orbital Plot Reconstruction: When deployed in X-Y pairs at a bearing plane, the two channel outputs feed directly into Bently Nevada System 1 or 3500 series monitors for real-time orbital plot generation, enabling engineers to distinguish between unbalance, misalignment, rub, and fluid instability based on orbit shape and precession direction.
• Hazardous Area Deployment: ATEX and FM certified variants of the 330905 family permit installation in Zone 1/Division 1 classified areas without additional intrinsic safety barriers, simplifying the installation bill of materials for offshore and refinery applications.
• Broad Frequency Capture: The DC-to-10,000 Hz bandwidth captures both slow-roll runout vectors (used for 1X compensation) and high-frequency structural resonances, providing a single transducer solution across the full diagnostic frequency range required by ISO 7919 and ISO 10816.
• Diagnostic Transparency via Gap Voltage: The raw gap voltage output is accessible at the monitor terminal strip, allowing field engineers to verify probe-to-shaft gap without disconnecting the transducer — a non-intrusive diagnostic step that confirms installation geometry without interrupting the protection function.
• Long-Term Stability: The absence of moving parts, combined with the hermetically sealed Proximitor housing, results in a mean time between failure (MTBF) that typically exceeds 10 years in clean industrial environments, reducing lifecycle replacement costs relative to contact-type displacement sensors.

Quality Assurance & Global Logistics

Every 330905-00-12-05-01-00 unit supplied by siemensplc.com is sourced through verified supply channels and subjected to a structured incoming inspection protocol before dispatch. Physical inspection covers label authenticity, connector pin condition, cable jacket integrity, and housing seal condition. Where test equipment is available, the Proximitor output voltage is verified against a reference gap fixture to confirm the scale factor is within the published tolerance band. Units that do not pass inspection are quarantined and not offered for sale.

Shipments originate from our warehouse in Xiamen, China — a major international logistics hub with direct access to air freight services connecting to all major industrial centres in Europe, the Middle East, Southeast Asia, and the Americas. Standard export documentation — commercial invoice, packing list, and certificate of conformance — is prepared for every order. For customers in regulated industries, we can provide additional traceability documentation upon request. Typical air freight transit times are 3–7 business days to most destinations. Express courier options (DHL, FedEx, UPS) are available for urgent requirements. All units are packed in anti-static, moisture-barrier packaging with foam cushioning to protect the probe tip and connector interfaces during transit.

Contact Information

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

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