Bently Nevada 330905-00-18-05-02-05 Proximity Transducer – 3300 XL Series

Bently Nevada 330905-00-18-05-02-05 — 8mm Eddy-Current Proximity Transducer in the 3300 XL Machinery Protection Architecture

The Bently Nevada 330905-00-18-05-02-05 is an 8mm eddy-current proximity transducer belonging to the 3300 XL Proximity Transducer System — a matched three-component measurement chain comprising probe, extension cable, and oscillator-demodulator driver. Within a rotating-machinery protection loop, this transducer occupies the sensing node: it converts the physical gap between its tip and a conductive target surface into a proportional DC voltage that downstream monitors interpret as radial vibration amplitude, axial shaft position, or rotational speed, depending on system configuration.

The 330905-00-18-05-02-05 designation encodes the probe’s physical and electrical configuration. The 8mm tip diameter defines the eddy-current field geometry and, consequently, the linear measurement range. The 5m integral cable length is factory-matched to the companion extension cable and driver to maintain the calibrated scale factor of 7.87 V/mm (200 mV/mil) across the full system. Deviation from the matched cable length — even by substituting an unmatched extension — shifts the resonant frequency of the LC tank circuit inside the driver and introduces scale-factor error that cannot be corrected by field calibration alone.

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Technical Parameters

Hardware Logical Analysis

The 330905-00-18-05-02-05 operates on the principle of a high-frequency LC oscillator embedded in the companion driver (330180 series). The driver generates a radio-frequency carrier — typically in the 500 kHz to 2 MHz band — which is conducted down the coaxial cable to the probe coil wound inside the 8mm tip housing. When the probe tip approaches a conductive target, the alternating magnetic field induces eddy currents in the target surface. These eddy currents load the probe coil, reducing its effective Q-factor and shifting the oscillator’s amplitude. The driver’s demodulator circuit converts this amplitude change into the linear DC output voltage.

EMC Design: The coaxial cable construction provides inherent shielding against capacitively coupled interference. The driver’s differential input architecture rejects common-mode noise on the cable run — a critical property in switchgear rooms and motor control centers where conducted EMI from variable-frequency drives can reach amplitudes of several volts. The MIL-C-5015 connector’s metal shell provides a continuous 360° shield termination, preventing shield discontinuity at the junction point — a common failure mode in industrial sensor installations.

Thermal Stability: The probe coil is wound on a ceramic bobbin with a low thermal coefficient of expansion. Over the −35 °C to +177 °C probe operating range, the scale factor drift is specified within ±1% of reading — a figure that matters in steam turbine bearing housings where metal temperatures can exceed 150 °C during sustained full-load operation. The driver’s internal temperature compensation circuit applies a correction polynomial to the demodulated output, maintaining system accuracy without field recalibration across seasonal ambient temperature swings.

Matched-System Calibration: The 330905-00-18-05-02-05 is factory-calibrated as a matched set with a specific extension cable and driver. The calibration data — scale factor, bias voltage, and linearity — is traceable to NIST-referenced standards. Substituting any component outside the matched set invalidates the factory calibration and requires a full system recalibration per API 670 Annex D procedures.

System Integration Benefits

• Direct API 670 Compliance: The 3300 XL system meets API 670 5th Edition requirements for machinery protection instrumentation, allowing direct use in new installations and replacement projects without additional engineering justification.
• Deterministic Signal Latency: The analog output path from probe tip to monitor input introduces no digital processing delay. Signal propagation through the cable and driver is governed by passive RC characteristics, with group delay below 1 ms — essential for overspeed trip systems where response time is contractually specified.
• Non-Contact Operation Eliminates Wear: With zero mechanical contact between probe and target, there is no wear mechanism. Mean time between maintenance interventions is limited only by connector corrosion and cable jacket degradation, not by any sensing element fatigue.
• Wide Target Material Compatibility: The eddy-current principle works on any electrically conductive target. The 330905-00-18-05-02-05 is calibrated for AISI 4140 steel (the API 670 reference material), with correction factors available for stainless steel, titanium, and aluminum shafts.
• Rack-Level Diagnostic Transparency: When paired with a 3300 XL monitor, the driver’s output voltage at the gap center (nominally −10 VDC for a 1.0 mm gap) is continuously readable via the monitor’s front-panel meter or MODBUS register, enabling maintenance personnel to verify probe gap without removing the machine from service.
• Intrinsically Safe Configuration Available: With the addition of a Bently Nevada 3300 XL Zener Barrier, the system can be deployed in ATEX Zone 1 / IECEx Group IIC hazardous areas — covering hydrogen-atmosphere compressor halls and offshore platform installations.
• Backward Compatibility with Legacy 3300 Racks: The 3300 XL probe is electrically compatible with earlier 3300 series monitors, allowing phased upgrades where the probe and cable are replaced without immediate monitor replacement — reducing capital expenditure on partial refurbishment projects.
• Simultaneous Multi-Parameter Measurement: A single 330905-00-18-05-02-05 installation can serve radial vibration, DC gap (position), and — with a keyphasor reference — phase angle measurement simultaneously, reducing the number of penetrations required through bearing housing walls.

Quality Assurance & Global Logistics

Every 330905-00-18-05-02-05 unit offered through siemensplc.com is sourced as genuine Bently Nevada (Baker Hughes) OEM product. Units are procured through documented supply channels and subjected to incoming inspection covering label authenticity, connector pin condition, cable jacket integrity, and — where test equipment permits — output linearity verification against the published scale factor.

Shipments originate from our warehouse in Xiamen, China (Fujian Province). Xiamen’s port infrastructure and direct air-freight links to major international hubs support the following logistics options:

• DHL Express / FedEx International Priority: 2–5 business days to Europe, North America, Middle East, and Southeast Asia for in-stock units.
• Air Freight (Consolidated): 5–10 business days for larger orders where dimensional weight makes express courier uneconomical.
• Sea Freight (FCL/LCL): Available for bulk procurement orders; transit times vary by destination port.
• Export Documentation: Commercial invoice, packing list, certificate of origin (CO), and — on request — a material test report (MTR) or inspection certificate are provided as standard.
• HS Code: 9031.80 (instruments and appliances for measuring or checking); EAR99 classification applies to most destinations.

A 12-month warranty covers manufacturing defects and functional failure under normal operating conditions from the date of shipment. Units exhibiting functional non-conformance on receipt are eligible for replacement or credit, subject to return authorization and inspection.

Contact Information

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