Bently Nevada 330104-00-17-90-02-CN Proximity Transducer – 3300 XL Series

Bently Nevada 330104-00-17-90-02-CN: 8mm Eddy-Current Proximity Transducer in the 3300 XL Machinery Protection Chain

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The Bently Nevada 330104-00-17-90-02-CN is an 8 mm eddy-current proximity transducer belonging to the 3300 XL Series — a measurement chain architecture that has been the de facto standard for API 670-compliant continuous shaft monitoring in critical rotating machinery for over two decades. Within a complete proximity measurement loop, this transducer functions as the primary sensing element: it converts the physical gap between its probe tip and a conductive target surface into a proportional DC voltage signal, which is then conditioned by a paired Proximitor® sensor before being transmitted to a protection rack or condition monitoring platform.

The part number suffix structure encodes precise hardware configuration. The -00-17 segment specifies a 5-metre integral cable assembly, while -90-02-CN defines the extension cable pairing and connector termination standard. This deterministic part numbering eliminates ambiguity during procurement and ensures that replacement units are dimensionally and electrically interchangeable with the original installation without field recalibration of the Proximitor® driver’s gap voltage or sensitivity coefficients — provided the target material and gap distance remain within the original commissioning parameters.

In a rotating machinery protection architecture, the proximity transducer occupies the most mechanically exposed position in the signal chain. It is mounted in direct proximity to the rotating shaft, typically within a bearing housing or a dedicated probe holder, and must maintain measurement integrity across continuous thermal cycling, lubricant mist exposure, and mechanical vibration loads that would degrade conventional contact-type sensors within weeks. The 3300 XL 8 mm probe addresses these constraints through a combination of stainless steel housing construction, armored cable jacketing rated for industrial chemical environments, and an eddy-current sensing coil geometry optimized for the 8 mm tip diameter’s linear measurement range — nominally 0.25 mm to 2.25 mm gap, with a sensitivity of approximately 7.87 V/mm (200 mV/mil) when paired with the correct Proximitor® driver.

From a signal integrity standpoint, the eddy-current transduction principle offers a fundamental advantage over piezoelectric or capacitive alternatives in this application: the output is a true DC-coupled displacement signal, not an AC-coupled velocity or acceleration proxy. This means the 330104-00-17-90-02-CN can simultaneously support radial vibration measurement (dynamic AC component, typically filtered above 1 Hz), shaft average centerline position tracking (quasi-static DC component), and eccentricity monitoring (slow-roll vector at 1× running speed) — all from a single installed probe, without additional signal conditioning hardware. The 3500 Series rack modules that typically receive this signal exploit all three components in parallel, enabling the protection system to distinguish between synchronous vibration, subsynchronous instability (oil whirl/whip), and static shaft displacement shifts that indicate bearing wear or thermal bow.

Procurement of the correct 330104-00-17-90-02-CN variant is critical in multi-probe installations where cable routing distances are fixed by conduit infrastructure. Substituting a probe with a different cable length suffix (e.g., -05 for 1.5 m or -25 for 7.5 m) without corresponding extension cable adjustment will shift the total loop inductance and resistance, altering the Proximitor® driver’s calibrated output scale factor and introducing a systematic measurement error that may not be immediately apparent during post-maintenance functional checks but will manifest as a calibration drift flag during the next scheduled verification interval.

Technical Parameters

Hardware Logical Analysis

The 3300 XL 8 mm probe’s eddy-current coil is wound to a geometry that produces a well-characterized impedance response across the target gap range. The driver electronics in the paired Proximitor® sensor supply a high-frequency oscillator signal (nominally 1.0 MHz carrier) through the coaxial cable to the probe coil. As the conductive target approaches the probe tip, eddy currents induced in the target surface load the coil, reducing its effective Q-factor and shifting the oscillator’s amplitude. The Proximitor® demodulates this amplitude-modulated carrier into a DC output voltage proportional to gap distance.

The -17 cable suffix (5 m integral cable) is electrically significant: the coaxial cable forms part of the resonant circuit. Bently Nevada calibrates each Proximitor® driver to a specific cable length and probe combination. Mixing cable lengths across a matched set degrades the linearity of the output curve, particularly at the extremes of the measurement range. The 330104-00-17-90-02-CN is therefore a system-level component, not a generic sensor, and must be replaced as a matched assembly.

EMC performance of the 3300 XL probe is achieved through the coaxial cable’s continuous shield, which is grounded at the Proximitor® end only (single-point grounding) to prevent ground loop currents from injecting common-mode noise into the measurement signal. In high-EMI environments — such as variable-frequency drive (VFD) motor rooms or switchgear enclosures — this single-point shield grounding strategy, combined with the high carrier frequency (1 MHz) that places the measurement band well above most industrial interference sources, maintains signal-to-noise ratios sufficient for detecting shaft vibration amplitudes as low as 2.5 µm peak-to-peak.

The stainless steel housing provides mechanical protection and serves as a secondary EMI shield for the coil assembly. The probe tip geometry is machined to tight tolerances to ensure that the effective sensing face is perpendicular to the shaft surface within ±0.5°, a requirement for maintaining the calibrated sensitivity coefficient across the full operating temperature range, where differential thermal expansion between the probe holder and the shaft journal could otherwise introduce a static gap offset error.

System Integration Benefits

• Direct API 670 Compliance: The 330104-00-17-90-02-CN meets the transducer performance requirements of API 670 5th Edition, enabling its use in machinery protection systems for covered equipment without additional qualification testing.
• Zero-Reconfiguration Replacement: Electrically and mechanically interchangeable with the original OEM installation; the Proximitor® driver requires no sensitivity or gap voltage adjustment when replacing a like-for-like unit.
• Simultaneous Multi-Parameter Output: A single installed probe delivers radial vibration (AC), shaft centerline position (DC), and eccentricity data to the 3500 rack — reducing probe count and conduit penetrations in bearing housings.
• Deterministic Real-Time Response: The 1 MHz carrier frequency and analog output architecture ensure measurement latency below 1 ms from physical displacement to rack input, supporting the 3500 rack’s trip response time of <1 ms for overvibration protection.
• Diagnostic Transparency via Gap Voltage: The DC gap voltage output provides a continuous, observable indicator of probe-to-shaft clearance, enabling maintenance teams to detect probe holder loosening, shaft journal wear, or probe contamination without removing the probe from service.
• Thermal Stability Across Operating Range: The 316 SS housing and matched cable assembly maintain sensitivity coefficient variation within ±1% across the –35 °C to +177 °C operating envelope, eliminating temperature-induced false alarms in steam turbine bearing housings.
• Compatibility with System 1® Software: The analog output integrates directly with Bently Nevada System 1® condition monitoring software for trend analysis, alarm management, and predictive maintenance workflows without signal conversion hardware.
• Reduced MTTR in Critical Applications: Stocked availability from Xiamen, China enables air-freight delivery to most global destinations within 3–7 business days, directly reducing mean time to repair for unplanned outages on critical rotating equipment.

Quality Assurance & Global Logistics

Every 330104-00-17-90-02-CN unit dispatched from our Xiamen, China facility undergoes a structured pre-shipment inspection protocol. Physical inspection covers connector pin integrity, cable jacket continuity, probe tip surface condition, and label authenticity against Bently Nevada OEM markings. Units are individually packaged in anti-static, moisture-barrier pouches with desiccant inserts, then placed in rigid foam-lined cartons rated for air and sea freight handling.

Supply chain traceability documentation — including sourcing records, inspection checklists, and where available, OEM test certificates — is maintained for each unit and can be provided upon request for critical applications subject to quality management system audits (ISO 9001, API Q1, or equivalent).

From Xiamen, we ship via DHL Express, FedEx International Priority, and UPS Worldwide Expedited to destinations across Asia-Pacific, Europe, the Middle East, and the Americas. Commercial invoices, packing lists, and certificates of origin are issued as standard. MSDS documentation and additional customs declarations can be arranged for regulated markets. In-stock units typically clear our warehouse within 24–48 hours of order confirmation. A 12-month warranty covers manufacturing defects and OEM specification non-conformance from the date of shipment.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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