Bently Nevada 330104-00-02-90-02-CN Proximity Transducer – 3300 XL Series

Bently Nevada 330104-00-02-90-02-CN: 8mm Eddy-Current Proximity Transducer in Rotating Machinery Protection Loops

The 330104-00-02-90-02-CN is a complete 8mm proximity transducer assembly within Bently Nevada’s 3300 XL platform — a system architecture that has defined the API 670 machinery protection standard for continuous shaft vibration and position measurement in turbomachinery. This specific configuration pairs a 2-metre probe cable with a 9-metre extension cable and the corresponding 3300 XL 8mm driver/oscillator, forming a calibrated three-component measurement chain. Each element is factory-matched to maintain the system’s nominal scale factor of 7.87 V/mm (200 mV/mil) across the full operating envelope without field recalibration.

In a typical radial vibration monitoring loop, the probe tip is positioned 1.0–2.5 mm from the shaft surface. The driver generates a high-frequency oscillation — nominally 1 MHz — that induces eddy currents in the conductive target. As shaft displacement varies, the impedance loading on the driver coil changes proportionally, producing a DC-biased output voltage that the 3500 Series rack or equivalent monitor decodes into engineering units. The 330104-00-02-90-02-CN system maintains this linear relationship from DC to 10,000 Hz, covering the full spectral range required for sub-synchronous instability detection, 1X/2X imbalance, and high-frequency rub events in machines operating up to 600,000 RPM equivalent tip speeds.

The probe housing is constructed from 316 stainless steel with a PEEK (polyether ether ketone) tip insert, providing chemical resistance against hydrocarbon condensates, lube oil, and process gas contaminants common in compressor and turbine environments. The cable assembly uses a coaxial construction with a fluoropolymer outer jacket rated to 121°C continuous, ensuring signal integrity in bearing housings where thermal gradients are steep and vibration-induced fatigue is a primary failure mode for lesser cable designs.

From a system integration standpoint, the 330104-00-02-90-02-CN is a direct drop-in replacement for any existing 3300 XL 8mm installation. The connector interface, cable impedance, and driver gain are factory-matched to the 3300 XL specification, meaning no span or zero adjustments are required at the monitor level when replacing a like-for-like unit. This characteristic is operationally significant during unplanned shutdowns, where minimising recommissioning time directly reduces production loss.

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Technical Parameters

Hardware Logical Analysis

The 3300 XL platform employs a three-component matched-system architecture — probe, extension cable, and driver — where the electrical characteristics of each element are interdependent. The driver’s oscillator circuit is tuned to the combined impedance of the probe coil and extension cable at the factory. Substituting any single component from a different calibration batch without re-matching will shift the scale factor by 2–5%, which at a 125 µm (5 mil) alarm setpoint represents a measurement error of 2.5–6.25 µm — sufficient to mask early-stage bearing wear in high-speed machinery.

The eddy-current sensing mechanism provides inherent immunity to contamination that would compromise optical or capacitive alternatives. Because the measurement field penetrates the target surface to a depth of approximately one probe diameter (8 mm), surface films of oil, water, or carbon deposits do not attenuate the signal. This is a critical design advantage in wet-gas compressors and steam turbines where bearing journal surfaces are continuously wetted.

EMC performance is achieved through the coaxial cable construction, which provides a continuous shield from probe tip to driver output. The shield is grounded at the driver end only, preventing ground-loop currents that would appear as low-frequency noise on the output signal. In installations near variable-frequency drives (VFDs) or high-current bus bars, this single-point grounding topology typically reduces conducted interference by 40–60 dB compared to unshielded twisted-pair alternatives.

The PEEK tip insert serves a dual function: electrical isolation of the probe coil from the metallic housing (preventing parasitic eddy currents in the housing from distorting the measurement field) and mechanical protection against incidental contact with the shaft during slow-roll or barring-gear operation. PEEK’s compressive strength of 100 MPa and continuous service temperature of 250°C provide adequate margin for bearing housing environments where intermittent thermal excursions occur during startup transients.

System Integration Benefits

• Deterministic frequency response to 10 kHz — The flat amplitude response from DC to 10,000 Hz ensures that the monitor receives an undistorted representation of shaft motion across all spectral components, including sub-synchronous oil-whirl frequencies (typically 0.43–0.48× running speed) and high-frequency rub signatures above 5× running speed.
• Zero-recalibration replacement — Factory-matched scale factor eliminates the need for span verification at the monitor after field replacement, reducing mean time to repair (MTTR) during unplanned outages by eliminating a calibration step that typically requires 30–90 minutes per channel.
• API 670 5th Edition compliance — The system meets the measurement chain requirements of API 670, including scale factor tolerance (±1% of nominal), frequency response, and temperature coefficient specifications, supporting direct use in machinery protection systems subject to insurance or regulatory audit.
• Diagnostic transparency via gap voltage monitoring — The DC component of the output voltage provides a continuous indication of probe-to-shaft gap. A shift in DC bias outside the –10 VDC to –18 VDC window indicates probe fouling, shaft eccentricity, or cable damage, enabling condition-based maintenance scheduling without removing the probe from service.
• Compatibility with 3500 Series rack I/O modules — The output impedance and voltage range are matched to the 3500/40M, 3500/42M, and 3500/44M monitor modules, ensuring correct input loading and preventing signal reflection artefacts that would appear as spurious vibration readings.
• Wide supply voltage tolerance — Operation from –18 VDC to –26 VDC accommodates power supply regulation variations in field panels without affecting scale factor, eliminating a common source of measurement drift in installations with long cable runs to the power supply.
• Thermal stability across process extremes — The probe’s temperature coefficient of scale factor is specified at ≤ 0.01%/°C, meaning a 100°C bearing housing temperature swing introduces less than 1% scale factor error — within the API 670 allowance for the complete measurement chain.
• Non-contact wear-free measurement — With no mechanical contact between probe and shaft, the sensor has no wear mechanism. Mean time between failures (MTBF) for the 3300 XL probe assembly in clean industrial environments exceeds 100,000 hours, supporting continuous 24/7 operation without scheduled sensor replacement intervals.

Quality Assurance & Global Logistics

Every 330104-00-02-90-02-CN unit supplied by siemensplc.com is sourced as genuine Bently Nevada (Baker Hughes) hardware through verified procurement channels with full chain-of-custody documentation. Units are inspected on receipt for housing integrity, connector condition, cable sheath continuity, and label authenticity against factory reference standards. Where stock permits, output linearity is bench-verified using calibrated gap simulation fixtures before dispatch.

Shipments originate from our warehouse in Xiamen, China — a major export hub with direct access to international express carriers. Standard lead time for in-stock units is 1–3 business days to dispatch. Delivery timelines by region:

• Southeast Asia & East Asia: 2–4 business days via DHL/FedEx express
• Europe & Middle East: 4–7 business days via DHL Express or TNT
• North America: 5–8 business days via FedEx International Priority
• South America & Africa: 7–12 business days; sea freight available for bulk orders

Export documentation provided as standard: commercial invoice, packing list, HS code 9031.80 declaration, and Certificate of Conformance (CoC) on request. Customs valuation support and CITES/EX certificates available for regulated markets. All units ship with a 12-month warranty against manufacturing defects from date of dispatch.

Contact Information

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