Bently Nevada 330904-00-12-10-01-CN Proximity Probe – 3300 XL Series

Bently Nevada 330904-00-12-10-01-CN — 8 mm Eddy-Current Proximity Probe for Continuous Shaft Monitoring

The Bently Nevada 330904-00-12-10-01-CN is a non-contact, eddy-current proximity probe engineered for continuous radial vibration and axial position measurement on rotating machinery. Operating as a matched component within the 3300 XL Proximity Transducer System, this probe converts mechanical displacement into a proportional DC voltage signal with a nominal sensitivity of 200 mV/mil (7.87 V/mm), providing the signal fidelity required by API 670 Fifth Edition machinery protection architectures.

The part number encodes the full mechanical and electrical configuration: 330904 designates the 8 mm tip diameter probe family; 00 indicates standard armour; 12 specifies a 12-inch (304.8 mm) probe body; 10 defines a 10-foot (3.05 m) integral cable; 01 denotes standard cable construction; and the CN suffix identifies the Chinese-market connector termination. This configuration is widely deployed in petrochemical, power generation, and LNG facilities across Asia-Pacific where CN-type connectors are the site standard.

Unlike piezoelectric accelerometers, the eddy-current transducer requires no physical contact with the shaft and introduces zero mechanical loading. The probe tip generates a high-frequency oscillating magnetic field (typically 1.0–1.5 MHz carrier frequency for the 8 mm family). When a conductive target enters the sensing field, eddy currents are induced on the target surface, absorbing energy from the oscillator circuit. The resulting change in oscillator amplitude is demodulated by the paired 3300 XL 8 mm driver (330180 Series) into a DC output spanning −1 VDC to −19 VDC across the calibrated measurement range of 0–90 mil (0–2.286 mm). This architecture delivers a flat frequency response from DC to well above 10 kHz, capturing sub-synchronous instabilities, synchronous imbalance, and high-frequency rubs within a single measurement channel.

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Technical Parameters

Hardware Logical Analysis

The 330904-00-12-10-01-CN probe body is constructed from 316L stainless steel, providing corrosion resistance in hydrogen sulfide-bearing atmospheres and resistance to galvanic coupling when mounted in carbon steel bearing housings. The coil assembly is encapsulated in a thermosetting epoxy compound rated to 177 °C, preventing moisture ingress and maintaining coil geometry under thermal cycling — a critical factor for long-term sensitivity stability.

EMC Design: The integral cable incorporates a tri-axial shielding arrangement: an inner shield referenced to the driver common, an outer shield connected to earth at the driver end only, and a drain wire for low-impedance shield termination. This configuration suppresses common-mode interference from variable-frequency drives (VFDs) operating in the 2–16 kHz switching range, which are prevalent in modern compressor trains. The shield topology prevents ground loops that would otherwise appear as spurious low-frequency components in the vibration spectrum.

Thermal Compensation: The oscillator circuit within the matched 330180 driver includes a temperature-compensated reference network that corrects for the probe coil’s positive temperature coefficient of inductance. Over the full operating range, this compensation limits sensitivity drift to less than ±0.5% per 50 °C change — a specification that matters in steam turbine applications where bearing housing temperatures can vary by 80–100 °C between cold start and full-load steady state.

Target Material Sensitivity: Factory calibration is performed against AISI 4140 steel. For shafts manufactured from 17-4 PH stainless, Inconel 718, or titanium alloys, a material correction factor must be applied. Bently Nevada publishes correction curves for over 40 common shaft alloys; failure to apply these corrections introduces a static bias error of up to 15% of full scale, which can mask genuine axial position changes in thrust bearing monitoring applications.

Mechanical Mounting Integrity: The M10 × 1 thread and 17 mm hex flat allow torque-controlled installation to 5–7 N·m using a standard proximity probe wrench. The probe tip recess is designed to maintain a minimum 1.5 mm clearance from the housing bore wall, preventing magnetic coupling to the housing that would shift the apparent gap voltage by up to 200 mV at nominal gap.

System Integration Benefits

• Deterministic DC-coupled output: The −1 VDC to −19 VDC output is directly compatible with the 3500 Series monitor input cards without signal conditioning, eliminating ADC quantisation errors introduced by intermediate signal converters.
• Matched-system calibration traceability: Each probe ships with a calibration certificate traceable to NIST/PTB standards, enabling compliance with ISO 17025 calibration management requirements at the plant level.
• Zero mechanical wear: Non-contact measurement eliminates the wear mechanisms that limit contact-type displacement sensors, supporting continuous operation intervals exceeding 100,000 hours in clean bearing environments.
• Flat frequency response to DC: Unlike velocity transducers, the eddy-current probe measures true static position, enabling axial thrust position monitoring and differential expansion measurement within the same transducer family.
• DCS integration via 3500 rack: The 3500 monitor outputs 4–20 mA and digital signals compatible with Emerson DeltaV, Honeywell Experion PKS, ABB 800xA, and Yokogawa CENTUM VP via HART or Modbus RTU, providing vibration data directly in the process historian without a separate data acquisition layer.
• Diagnostic transparency: The 3300 XL driver provides a buffered output at the probe gap voltage, allowing portable analysers to verify probe gap and sensitivity without interrupting the protection channel — a critical capability during online commissioning and periodic functional testing.
• Hazardous area compatibility: ATEX-certified configurations support installation in Zone 1 and Zone 2 classified areas, covering the majority of rotating equipment installations in refinery and offshore environments.
• Interchangeability within the 3300 XL family: All 8 mm probes within the 330904 series share identical electrical characteristics, allowing field replacement without recalibration of the monitor trip setpoints — provided the replacement probe is from the same matched system configuration.

Quality Assurance & Global Logistics

Every unit of the 330904-00-12-10-01-CN supplied by siemensplc.com is sourced through verified channels and undergoes incoming inspection prior to dispatch. Inspection procedures include gap voltage verification at the nominal 50 mil (1.27 mm) gap point, cable continuity and insulation resistance testing at 500 VDC, and visual inspection of the probe tip and connector for mechanical damage. Units that do not meet the factory sensitivity specification of 200 mV/mil ± 5% are quarantined and returned to the supply chain.

Shipments originate from our warehouse in Xiamen, China, a major export hub with direct access to international freight forwarders serving North America, Europe, the Middle East, and Southeast Asia. Standard export documentation — including commercial invoice, packing list, and certificate of origin — is prepared for all international orders. For orders requiring ATEX documentation or material traceability certificates, these are requested from the manufacturer and included in the shipment package.

Typical dispatch lead time for in-stock units is 3–5 business days. Air freight to major hubs in Europe and North America typically achieves door-to-door delivery within 7–10 business days. Sea freight consolidation is available for bulk orders. All shipments are covered by a 12-month warranty against manufacturing defects, with advance replacement available for critical-path maintenance scenarios upon agreement.

Contact Information

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