Bently Nevada 330105-02-12-10-12-CN Proximity Probe – 3300 XL Series

Bently Nevada 330105-02-12-10-12-CN — 8 mm Reverse-Mount Eddy Current Proximity Probe in the 3300 XL Transducer System

The 330105-02-12-10-12-CN is an 8 mm reverse-mount eddy current proximity probe manufactured by Bently Nevada as part of the 3300 XL 8mm Proximity Transducer System. Its primary function within a machinery protection loop is to deliver continuous, non-contact displacement measurements of rotating shaft surfaces — capturing radial vibration amplitude, shaft centerline position, and slow-roll eccentricity with a DC-coupled output that preserves both dynamic and static components of shaft motion.

In a typical API 670-compliant protection architecture, this probe operates as the first element in a three-component transducer chain: probe → extension cable → proximitor driver. The 330105-02-12-10-12-CN is factory-calibrated to produce a nominal sensitivity of 7.87 V/mm (200 mV/mil) into a Bently Nevada 3300 RAM driver, with a linear measurement range of 0.25 mm to 2.25 mm (10–90 mil) gap. The reverse-mount body geometry allows the probe tip to be inserted from the non-drive end of a bearing housing, making it the preferred configuration for retrofits where front-access machining is not feasible.

The CN connector suffix designates a Chinese-standard coaxial termination, ensuring dimensional and impedance compatibility with locally sourced extension cables and junction boxes common in Chinese power generation and petrochemical installations. The 3 m integral cable (code segment 12) provides adequate reach from the bearing housing to the nearest junction box without requiring an additional extension cable segment in short-run installations.

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Technical Parameters

Hardware Logical Analysis

The operating principle of the 330105-02-12-10-12-CN is based on the eddy current effect: a high-frequency oscillator within the proximitor driver energizes the probe coil, generating an electromagnetic field that penetrates the target surface. As the conductive target approaches or recedes from the probe tip, eddy currents induced in the target surface load the oscillator circuit, producing a proportional change in oscillator amplitude. This amplitude modulation is demodulated and scaled to the calibrated output voltage slope of 7.87 V/mm.

Reverse-mount geometry is the defining mechanical feature of the 330105 series. Unlike standard forward-mount probes where the cable exits from the rear of the probe body, the reverse-mount configuration routes the cable through the center of the probe body and exits from the tip side — allowing the probe to be threaded into a bearing housing from the back face. This eliminates the need for a through-bore in the housing front plate and is particularly valuable in compressor and turbine retrofits where the original housing was not designed for proximity probe installation.

EMC design: The coaxial cable construction with continuous shield coverage from probe tip to connector maintains signal integrity in high-electromagnetic-interference environments typical of large rotating machinery. The shield is grounded at the proximitor driver end only (single-point grounding), preventing ground loop currents that would appear as low-frequency noise on the displacement signal. The armored outer jacket provides mechanical protection against hydraulic fluid, lubricating oil, and steam condensate — all common in turbine bearing environments.

Thermal stability: The probe coil is wound on a ceramic bobbin with a low thermal coefficient of inductance. Over the operating range of −35°C to +121°C, sensitivity drift is maintained within the ±1% specification required by API 670 for machinery protection applications. The 316 stainless steel body resists corrosion from sulfur-bearing lubricants and process gas condensates.

Target material dependency: The 7.87 V/mm calibration is valid for AISI 4140 steel targets. For shafts manufactured from austenitic stainless steel (e.g., 316L), titanium alloys, or Inconel, the effective sensitivity deviates by up to ±20%. Bently Nevada publishes target material correction factors; these must be applied during system commissioning to maintain measurement accuracy within API 670 alarm and trip setpoint tolerances.

System Integration Benefits

• Drop-in driver compatibility: Factory calibration to 200 mV/mil ensures the probe integrates directly with Bently Nevada 3300 RAM (330180), 3500/40M, and 3500/42M Proximitor I/O modules without field sensitivity adjustment, reducing commissioning time to gap-setting only.
• DC-coupled output preserves static position data: The output voltage encodes both the dynamic vibration component (AC) and the static shaft centerline position (DC offset), enabling the monitor to simultaneously compute vibration amplitude and shaft average centerline plots from a single transducer channel.
• Deterministic frequency response to 10 kHz: The flat ±3 dB bandwidth from DC to 10,000 Hz covers all subsynchronous, synchronous, and supersynchronous vibration components up to 600,000 RPM (10X running speed at 60,000 RPM), supporting full spectral analysis without probe-induced rolloff artifacts.
• Reverse-mount form factor reduces installation downtime: Bearing housing modification is limited to a single M10 × 1.0 threaded bore on the back face, achievable with portable machining equipment during a planned outage — eliminating the need for housing replacement or major structural modification.
• CN connector standardization: Compatibility with Chinese-standard coaxial connectors and locally available extension cables (e.g., 330130-CN series) simplifies spare parts management for domestic operators and reduces procurement lead time for replacement cables.
• API 670 compliance pathway: When paired with a 3300 RAM driver and a 3500-series monitor, the complete transducer chain meets the performance requirements of API 670 5th Edition for radial vibration and position measurement, supporting machinery protection system certification audits.
• Diagnostic transparency via gap voltage monitoring: The monitor continuously reads the DC gap voltage, enabling real-time detection of probe-to-shaft gap drift caused by bearing wear, thermal growth, or probe loosening — providing a maintenance alert before the gap exits the linear range.
• Broad machinery applicability: The 8 mm probe diameter and M10 thread are the most widely specified configuration in API 670 installations globally, making the 330105-02-12-10-12-CN a universal spare that covers steam turbines, gas turbines, centrifugal compressors, boiler feed pumps, and large electric motors within a single part number.

Quality Assurance & Global Logistics

Every 330105-02-12-10-12-CN unit supplied through siemensplc.com is sourced as genuine Bently Nevada OEM product through verified supply channels. Each unit is accompanied by a Certificate of Conformance traceable to the manufacturing lot, and factory calibration data is available on request for applications requiring documented sensitivity verification at commissioning.

Pre-shipment inspection covers connector integrity, cable continuity, shield isolation resistance (>100 MΩ at 500 VDC), and visual examination of the probe tip and thread form. Units are packaged in anti-static foam inserts within moisture-barrier bags, enclosed in rigid cartons rated for international air freight handling.

Shipments originate from our warehouse in Xiamen, China, with access to daily consolidation flights to major industrial hubs including Singapore, Dubai, Rotterdam, Houston, and Tokyo. Standard in-stock orders are dispatched within 1–2 business days. Express DHL/FedEx door-to-door delivery to most destinations is achievable within 3–5 business days. For time-critical plant shutdowns, same-day dispatch is available on confirmed orders received before 14:00 CST.

All export documentation — commercial invoice, packing list, certificate of origin, and MSDS where applicable — is prepared in compliance with destination country import requirements. HS Code 9031.80 applies to this product category for customs classification purposes.

Contact Information

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