Bently Nevada 330104-08-15-10-02-05 Proximity Transducer – 3300 XL Series

Bently Nevada 330104-08-15-10-02-05: 8mm Eddy-Current Proximity Transducer for API 670 Machinery Protection

The 330104-08-15-10-02-05 is a complete eddy-current proximity transducer assembly within the Bently Nevada 3300 XL 8mm system. It consists of a short-body 8 mm probe (15 mm overall probe length), a 5-meter armored extension cable, and is designed to interface with the 3300 XL driver/signal conditioner. The transducer operates on the principle of electromagnetic induction: a high-frequency oscillating current in the probe coil generates an alternating magnetic field. When a conductive target—typically a rotating shaft machined from AISI 4140 steel—enters this field, eddy currents are induced on the target surface. The resulting change in coil impedance is detected by the driver electronics and converted to a DC voltage output proportional to the gap between probe tip and shaft surface. This non-contacting measurement principle eliminates mechanical wear, enabling continuous, maintenance-free operation across the full machine lifecycle.

Within the 3300 XL product family, the 330104 sub-series designates the standard-temperature, armored-cable configuration. The -08 suffix specifies the 8 mm probe tip diameter, -15 defines the 15 mm probe body length (short probe, suited for restricted bearing housing access), -10 indicates the standard temperature rating, -02 denotes the reverse-mount thread geometry, and -05 specifies the 5-meter extension cable. Each parameter in the part number is a functional specification, not a catalog convenience—substituting any digit changes the physical or electrical characteristics of the assembly.

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Technical Parameters

Hardware Logical Analysis

The 3300 XL 8mm probe coil is wound on a ferrite core and encapsulated in a thermally stable polymer housing. The coil geometry is optimized for an 8 mm tip diameter to produce a field depth of approximately 2× the tip diameter—roughly 16 mm into the target surface. This field geometry determines the effective measurement zone and sets the upper bound on acceptable shaft surface finish and runout. The probe assembly is hermetically sealed to IP67, preventing condensate ingress in bearing housings where oil mist and humidity are constant.

The armored extension cable is a coaxial assembly with a braided stainless-steel outer armor. The armor serves a dual function: mechanical protection against abrasion and crush loads in cable trays, and electromagnetic shielding against radiated interference from variable-frequency drives (VFDs), high-current bus bars, and adjacent instrumentation wiring. The shield is grounded at the driver end only (single-point grounding) to prevent shield current loops that would introduce 50/60 Hz noise into the measurement signal.

The driver electronics perform three functions: they supply the oscillator current to the probe coil at a fixed carrier frequency (typically in the range of 1–2 MHz for 8 mm probes), demodulate the impedance-modulated carrier to extract the gap-proportional DC component, and buffer the output to drive the low-impedance input of the connected monitor card. The –24 VDC bias supply required by the driver is provided by the monitor system (e.g., Bently Nevada 3500 series), eliminating the need for a separate field power supply. The driver’s thermal compensation circuit corrects for coil resistance drift across the –35 °C to +66 °C cable operating range, maintaining sensitivity accuracy within ±0.5% of nominal across the full thermal envelope.

The reverse-mount thread geometry (-02) positions the probe body behind the mounting bracket face, reducing the exposed probe length in the bearing housing bore. This geometry is mechanically advantageous in applications where axial space between the probe tip and adjacent rotating components is constrained, and it also reduces the risk of probe contact damage during shaft insertion or removal.

System Integration Benefits

• Direct API 670 compliance: The 330104-08-15-10-02-05 meets the transducer performance requirements of API Standard 670 (5th Edition) for radial vibration and axial position measurement, enabling drop-in use in new or retrofit machinery protection systems without additional qualification testing.
• Deterministic DC-coupled output: The –24 VDC output is DC-coupled from 0 Hz, capturing both static gap (position) and dynamic displacement (vibration) in a single channel. This eliminates the need for separate position and vibration transducers on machines requiring both measurements.
• Plug-compatible with 3500 Series monitors: The output signal is directly compatible with Bently Nevada 3500/40M, 3500/42M, and 3500/45 monitor input cards without signal conditioning adapters, reducing wiring complexity and potential signal chain error sources.
• System interchangeability without field recalibration: Within the 3300 XL 8mm family, matched probe-driver pairs are factory-calibrated as a system. Replacing a failed probe with an identical 330104-08-15-10-02-05 and pairing it with the original driver restores calibrated performance without on-site recalibration, minimizing machine downtime.
• Diagnostic transparency via gap voltage monitoring: The DC bias voltage at the driver output provides a continuous, real-time indication of probe-to-shaft gap. Operators can monitor this voltage to detect probe fouling, shaft centerline migration, or bearing wear trends before they reach alarm thresholds.
• High-frequency response for sub-synchronous detection: The 10 kHz (–3 dB) frequency response captures sub-synchronous instabilities such as oil whirl (typically 0.43–0.48× running speed) and oil whip, which are precursors to catastrophic fluid-film bearing failure and are invisible to lower-bandwidth sensors.
• EMC-hardened signal path: Single-point-grounded coaxial cable architecture and the driver’s differential input stage provide common-mode rejection of induced electrical noise, maintaining signal integrity in electrically noisy environments such as motor control centers and switchgear rooms.
• Compact short-probe geometry for restricted access: The 15 mm probe body length accommodates bearing housing designs with limited axial depth, expanding the range of machines that can be instrumented without housing modification or custom probe fabrication.

Quality Assurance & Global Logistics

Every 330104-08-15-10-02-05 unit supplied through our Xiamen, China facility is sourced from authorized distribution channels with full supply chain traceability. Pre-shipment inspection covers connector pin integrity, cable jacket continuity, probe tip concentricity, and label/serialization legibility. Original manufacturer documentation—including test certificates and, where available, Certificate of Conformance—is provided upon request.

Packaging follows anti-static and moisture-barrier protocols: each probe assembly is individually bagged in ESD-safe film, cushioned with closed-cell foam, and boxed in double-wall corrugated cartons rated for international air freight handling. Export documentation—commercial invoice, packing list, Certificate of Origin—is prepared in compliance with destination country import requirements. Express air freight from Xiamen Gaoqi International Airport reaches most destinations in Southeast Asia within 3–5 business days, Middle East and Europe within 5–8 business days, and the Americas within 7–10 business days. Sea freight consolidation is available for volume orders. All shipments are insured against transit loss and damage.

A 12-month warranty covers manufacturing defects from the date of dispatch. Verified defective units are replaced or credited in full. Our technical team provides pre-sales compatibility verification and post-sales installation guidance at no additional charge.

Contact Information

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