Bently Nevada 330104-02-18-10-01-00 Proximity Transducer System – 3300 XL

Bently Nevada 330104-02-18-10-01-00 — 8mm Eddy-Current Proximity Transducer in the 3300 XL Platform

The Bently Nevada 330104-02-18-10-01-00 is an 8mm diameter eddy-current proximity probe within the 3300 XL Series, engineered for continuous, non-contact measurement of shaft radial vibration, axial position, and differential expansion in critical rotating machinery. Compliant with API 670 Fourth Edition, this transducer is a primary sensing element in machinery protection systems deployed across gas turbines, steam turbines, centrifugal compressors, and large motor-driven trains in the oil & gas, power generation, and petrochemical sectors.

Unlike piezoelectric accelerometers that measure surface acceleration, the eddy-current proximity probe measures absolute shaft displacement relative to the bearing housing — a direct mechanical quantity that governs trip logic in API 670-compliant protection racks. The 330104-02-18-10-01-00 configuration specifies an 18-inch (457 mm) integral armored cable and a 10-foot (3.05 m) extension cable, matched to the 3300 XL 8mm Proximitor® driver for a factory-calibrated system scale factor of 7.87 V/mm (200 mV/mil).

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Technical Parameters

Hardware Logical Analysis

The 330104-02-18-10-01-00 operates on the Lenz’s Law eddy-current principle. The probe coil, driven by the Proximitor® oscillator at approximately 1 MHz, generates a high-frequency electromagnetic field that penetrates the target shaft surface. As the conductive target moves within the linear range, eddy currents induced in the shaft surface load the oscillator circuit, attenuating the oscillation amplitude in direct proportion to the air gap distance. The Proximitor® demodulates this amplitude-modulated carrier and outputs a DC voltage linearly proportional to gap — no moving parts, no contact, no wear.

EMC Design Architecture: The 3300 XL platform addresses electromagnetic interference through three layers. First, the integral armored cable uses a continuous stainless-steel overbraid bonded to the probe body, providing a Faraday shield that attenuates external RF fields above 30 MHz by >40 dB. Second, the Proximitor® driver incorporates differential input filtering with a –3 dB corner at 15 kHz on the power supply rail, rejecting conducted interference from adjacent VFD-driven equipment. Third, the coaxial transmission line between probe and driver maintains a controlled 50 Ω characteristic impedance, preventing standing-wave reflections that would corrupt the demodulated DC output at cable lengths up to 10 m.

Thermal Stability: The probe coil is wound on a ceramic-filled PEEK former with a thermal coefficient of inductance below 50 ppm/°C across the –35°C to +177°C range. This ensures scale factor drift remains within ±1% over the full operating envelope — a critical parameter for axial position measurement where a 25 µm drift at the probe translates directly to a false thrust-bearing wear indication at the monitor.

Target Material Sensitivity: The eddy-current penetration depth (skin depth δ) at 1 MHz in AISI 4140 steel is approximately 8 µm. The factory calibration is performed against this specific alloy. For shafts manufactured from 17-4 PH stainless, Inconel 718, or titanium, the relative permeability and resistivity differences shift the scale factor by 3–18%. The 330104-02-18-10-01-00 system includes a target material correction table in the calibration documentation, enabling field engineers to apply a software gain correction in the 3500 monitor without hardware substitution.

Matched-Set Calibration: Bently Nevada factory-calibrates probe, extension cable, and Proximitor® driver as a serial-numbered matched set. The extension cable’s distributed capacitance (nominally 98 pF/m) forms part of the resonant tank circuit. Substituting an extension cable of different length or dielectric constant shifts the oscillator frequency by up to 2%, producing a proportional scale factor error. Field replacement must always specify the complete system part number to maintain API 670 measurement uncertainty requirements of ±1% of full-scale range.

System Integration Benefits

• Direct 3500 Rack Compatibility: The –1 VDC to –21 VDC output range maps directly to the 3500/40M and 3500/42M monitor input specifications without signal conditioning adapters, eliminating an additional failure point in the signal chain.
• DC-Coupled Measurement Path: The DC-to-10,000 Hz frequency response preserves both the static gap (position) and dynamic vibration components in a single output signal, allowing the 3500 monitor to simultaneously process 1× synchronous vibration, sub-synchronous instability, and slow-roll runout from one transducer.
• Deterministic Alarm Response: Because the output is a continuous analog voltage with no digital sampling latency, the 3500 monitor’s hardware comparators can assert a danger trip within 1 ms of the shaft exceeding the setpoint — a response time that digital fieldbus-based sensors cannot match in machinery protection applications.
• Hazardous Area Zoning Flexibility: Dual FM/CSA and ATEX/IECEx certifications allow a single part number to be deployed in North American Class I Division 1 and European Zone 0 installations, reducing spare-parts inventory complexity for multinational operators.
• IP67 Ingress Protection: The sealed probe and cable assembly withstands direct oil mist impingement and steam condensate in bearing housing environments, eliminating the moisture-induced coil resistance drift that degrades uncased probe designs.
• Wide Thermal Operating Envelope: Probe qualification to +177°C covers hot-section bearing housings on gas turbines where ambient temperatures routinely exceed +150°C, removing the need for thermal standoffs or probe cooling provisions.
• Non-Contact Zero-Wear Operation: With no mechanical contact between probe and shaft, the transducer has no defined wear-out mechanism under normal operating conditions. Mean time between replacement is governed by cable fatigue from vibration, not probe degradation — typically exceeding 10 years in well-supported installations.
• Diagnostic Transparency via Gap Voltage Monitoring: The raw DC gap voltage is accessible at the Proximitor® output terminal. Trending this value over time provides a direct indicator of bearing wear (decreasing gap) or shaft bow (oscillating gap at 1× running speed), enabling condition-based maintenance decisions without additional instrumentation.
• API 670 Compliance for Insurance and Regulatory Acceptance: Machinery protection systems built with 330104-02-18-10-01-00 satisfy the transducer performance requirements of API 670 Fourth Edition, which is referenced by IEC 61511 functional safety assessments and required by many insurance underwriters for unspared critical machinery.

Quality Assurance & Global Logistics

Every Bently Nevada 330104-02-18-10-01-00 unit supplied by siemensplc.com is sourced through verified industrial distribution channels with full factory traceability. Authenticity verification follows a four-stage protocol before dispatch:

• Documentation Audit: Factory Certificate of Conformance, date code, and serial number are cross-referenced against Bently Nevada production records to confirm genuine manufacture and exclude counterfeit or refurbished units.
• Physical Inspection: Probe tip geometry, cable armor integrity, connector seating, and label typography are inspected against OEM reference samples. Any unit with evidence of re-marking, re-packaging, or mechanical damage is quarantined and rejected.
• Functional Verification: Gap voltage output and scale factor are measured on a calibrated test bench using an AISI 4140 target at controlled ambient temperature. Results are logged and included in the shipment documentation package.
• Protective Packaging: Units are shipped in anti-static foam-lined cases with tamper-evident seals, desiccant packs, and a full documentation set including CoC, inspection report, and datasheet.

Logistics are managed from our warehouse in Xiamen, China, with DHL Express and FedEx International Priority as primary carriers. Standard export documentation — commercial invoice, packing list, and certificate of origin — is prepared for all international shipments. Customs HS code 9031.80 applies to proximity transducer systems. Typical transit times: 3–5 business days to Europe and North America; 2–3 business days to Southeast Asia. Emergency same-day dispatch is available for in-stock units when orders are confirmed before 14:00 CST.

Contact Information

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