Bently Nevada 330104-05-10-05-02-CN Proximity Transducer – 3300 XL Series

Bently Nevada 330104-05-10-05-02-CN: 8 mm Eddy-Current Proximity Transducer in Rotating Machinery Protection Loops

The Bently Nevada 330104-05-10-05-02-CN is an 8 mm eddy-current proximity transducer from the 3300 XL Series, engineered for non-contacting, continuous measurement of radial shaft vibration, axial position, and eccentricity in high-speed rotating machinery. The CN suffix designates the Chinese-market connector configuration, ensuring direct compatibility with locally standardized field wiring and junction box assemblies prevalent in Chinese petrochemical, power generation, and heavy industrial installations.

Within a machinery protection control loop, this transducer occupies the first signal-conditioning stage: it converts mechanical displacement into a proportional DC voltage at a calibrated scale factor of 7.87 V/mm (200 mV/mil). That analog output feeds directly into a Bently Nevada Proximitor® driver or a 3500-series I/O module, where the signal is conditioned, filtered, and compared against alarm and danger setpoints. The deterministic, low-latency nature of the eddy-current output — with a frequency response flat from DC to 10,000 Hz — makes it the preferred sensing technology for API 670-compliant turbomachinery protection systems where trip response times are measured in milliseconds.

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Technical Parameters

Hardware Logical Analysis

The 330104-05-10-05-02-CN operates on the principle of electromagnetic induction: a high-frequency oscillator (typically 1.0 MHz carrier) within the paired Proximitor® driver energizes the probe coil, generating an alternating magnetic field at the probe tip. When a conductive target (shaft) enters this field, eddy currents are induced on the target surface, loading the oscillator circuit and producing a measurable impedance change. The driver demodulates this impedance variation into a DC voltage proportional to the probe-to-target gap — a fundamentally passive, wear-free transduction mechanism with no moving parts.

EMC Architecture: The coaxial cable construction of the 3300 XL probe provides inherent shielding against capacitively coupled interference. The shield is grounded at the driver end only (single-point grounding), eliminating ground-loop currents that would otherwise appear as low-frequency noise on the output signal. In high-EMI environments — such as variable-frequency drive (VFD) motor rooms or high-voltage switchgear areas — the probe’s coaxial geometry maintains signal integrity at the 200 mV/mil scale factor without requiring additional external shielding conduit.

Thermal Stability: The probe coil is wound on a ceramic former with a low thermal coefficient of inductance. Over the operating range of –35 °C to +121 °C, the scale factor drift is maintained within ±1% of nominal, ensuring that temperature excursions in bearing housings or steam turbine casings do not introduce systematic measurement bias into the protection loop.

CN Connector Design Logic: The CN connector variant replaces the standard BNC termination with a circular multi-pin connector conforming to Chinese industrial wiring standards. This eliminates the need for field-fabricated BNC-to-terminal adapters, reduces connector resistance variability, and simplifies maintenance in installations where local technicians are trained on CN-type field wiring. The connector body is rated IP67, providing ingress protection against condensation and wash-down in turbine hall environments.

System Impedance Matching: The 330104 probe is factory-matched to the 3300 XL driver impedance specification. Substituting probes from the 7200 series or third-party equivalents without re-characterizing the driver will shift the operating point on the driver’s demodulation curve, introducing a systematic gap error of up to ±0.15 mm — sufficient to cause nuisance trips or missed alarms at tight setpoint margins. This matched-system architecture is a deliberate design constraint that enforces traceability and measurement integrity across the installed base.

System Integration Benefits

• Deterministic DC-coupled output: The 0 Hz lower frequency limit captures static shaft position (thrust position, slow-roll eccentricity) alongside dynamic vibration — a single transducer covers both protection and condition monitoring functions without additional instrumentation.
• Direct 3500-rack compatibility: The 330104 probe integrates with the 3500/40M and 3500/42M Proximitor I/O modules without signal conditioning adapters, preserving the rack’s ±0.5% full-scale accuracy specification end-to-end.
• API 670 alarm architecture support: The calibrated 7.87 V/mm scale factor maps directly to the 3500 monitor’s engineering unit conversion, enabling setpoint entry in physical units (µm pk-pk or mil pk-pk) rather than raw voltage — reducing commissioning errors.
• Diagnostic transparency via gap voltage: The DC bias output at nominal gap (–10.4 VDC) serves as a continuous health indicator. Drift beyond ±10% of nominal indicates probe contamination, target runout, or mounting looseness — detectable during routine data review without removing the transducer.
• Low cross-axis sensitivity: The 8 mm probe geometry provides a measurement field diameter of approximately 3× the probe tip, minimizing sensitivity to lateral shaft motion perpendicular to the measurement axis. This reduces false readings in machines with combined radial and axial motion.
• Wide bandwidth for blade-pass and gear-mesh analysis: The 10,000 Hz frequency response captures high-order harmonics from gear meshes, blade-pass events, and sub-synchronous instabilities — enabling spectrum-based diagnostics within the same hardware used for protection.
• Reduced field wiring complexity with CN connector: Pre-terminated CN connectors eliminate field soldering and reduce wiring errors during installation or maintenance outages, shortening commissioning time and improving repeatability of electrical connections.
• Long-term installed-base investment protection: The 3300 XL series maintains backward compatibility with 3500-series monitors and System 1 software, ensuring that upgrading the monitoring platform does not require replacing field-installed transducers — a significant lifecycle cost advantage in large turbomachinery fleets.

Quality Assurance & Global Logistics

Every Bently Nevada 330104-05-10-05-02-CN unit supplied by siemensplc.com is sourced through verified distribution channels and carries the original Baker Hughes / Bently Nevada factory markings, serial number, and calibration data. Units are stored in climate-controlled conditions to prevent moisture ingress and connector oxidation prior to shipment.

Pre-shipment inspection protocol: Physical integrity check (housing, cable sheathing, connector pins), serial number cross-reference against manufacturer records, and output voltage verification at a known reference gap using calibrated test equipment. A 12-month warranty against manufacturing defects is provided from the date of shipment.

Logistics from Xiamen, China: Orders are dispatched from our Xiamen warehouse via DHL Express, FedEx International Priority, or UPS Worldwide Expedited. Standard transit times: 2–4 business days to Southeast Asia and Japan; 3–5 business days to the Middle East and Europe; 5–7 business days to the Americas. For urgent plant shutdowns or unplanned outages, same-day dispatch is available for in-stock units on orders confirmed before 14:00 CST. Export documentation — commercial invoice, packing list, certificate of origin, and HS code 9031.80 classification — is prepared for all international shipments to facilitate smooth customs clearance.

Anti-static, moisture-barrier packaging with foam-cushioned inner trays protects the probe tip and connector during transit. Original OEM packaging is preserved where available from the supply chain.

Contact Information

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