Bently Nevada 330104-00-03-90-11-00 Proximity Probe – 3300 XL Series

Bently Nevada 330104-00-03-90-11-00 — Eddy Current Proximity Probe for Rotating Machinery Protection

The Bently Nevada 330104-00-03-90-11-00 is a metric-thread eddy current proximity probe belonging to the 3300 XL Proximity Transducer System. It is engineered for continuous, non-contact displacement and vibration measurement on rotating shafts in turbomachinery, compressors, pumps, and generators. The probe operates on the eddy current principle: a high-frequency oscillating magnetic field generated at the probe tip induces eddy currents in the conductive target surface; the resulting impedance change is converted by the paired Proximitor® sensor into a DC voltage proportional to the gap distance. This measurement chain delivers sub-micron resolution with a flat frequency response from DC to 10,000 Hz, making it equally effective for slow-roll eccentricity checks at startup and for capturing sub-synchronous instability events at full operating speed.

The 330104-00-03-90-11-00 variant is defined by its 90 mm active probe body, 3 m integral armored cable, M10 × 1.0 metric thread, and 11-pin connector. These dimensional parameters are fixed at manufacture and must be matched precisely to the target machinery mount and the selected extension cable from the 330130 Series. Incorrect gap setting or mismatched cable length will shift the system scale factor and introduce measurement error; the nominal scale factor for this probe-cable-Proximitor combination is 7.87 V/mm (200 mV/mil) at a linear gap range of approximately 0.25 mm to 2.25 mm.

In API 670-compliant machinery protection systems, this probe is typically installed in pairs at 90° X–Y orientation to resolve the full orbital trajectory of the shaft centerline. The resulting Bode, polar, and orbit plots generated by the 3500 Series monitor provide the diagnostic data required for condition-based maintenance decisions, reducing unplanned downtime in critical rotating equipment.

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Technical Parameters

Hardware Logical Analysis

The 3300 XL probe tip houses a precision-wound coil encapsulated in a thermally stable polymer compound. The coil geometry is calibrated at the factory to produce a defined inductance-versus-gap characteristic curve; this curve is the physical basis of the 7.87 V/mm scale factor. Because the measurement is purely inductive, the probe has no moving parts, no contact wear surface, and no optical path to contaminate — the three primary failure modes of competing sensor technologies in oil-mist and high-temperature environments.

EMC Design: The armored integral cable acts as a coaxial shield, attenuating capacitively coupled interference from adjacent power cables and variable-frequency drives. The shield is grounded at the Proximitor® sensor end only (single-point grounding), preventing ground loop currents that would appear as low-frequency noise on the gap signal. In installations where the probe is routed through high-EMI zones, the 330130 extension cable adds a second shielded segment; the two shields are joined at the junction box with a single ground reference, maintaining the single-point topology.

Thermal Stability: The encapsulant material maintains coil geometry within specification across the full −35 °C to +177 °C operating range. Thermal expansion of the probe body is accounted for in the calibration; the scale factor deviation across the temperature range is within ±1% of nominal, which is within the error budget of API 670 channel accuracy requirements (±5% of full-scale).

Target Surface Requirements: The eddy current field penetrates approximately 0.25 mm into the target at the oscillator frequency used by the 3300 XL system. Surface treatments such as chrome plating, nickel plating, or hard anodizing on the shaft will alter the effective permeability and conductivity seen by the probe, shifting the scale factor. Bently Nevada publishes target material correction factors; for non-standard shaft materials, a field calibration against a known gap standard is required to maintain measurement accuracy.

Oscillator Frequency: The 3300 XL system operates at a proprietary oscillator frequency optimized for the 8 mm probe tip diameter. This frequency is not user-adjustable; it is set by the Proximitor® sensor electronics. The fixed frequency ensures that the probe-cable-Proximitor system behaves as a matched set, and substituting components from other Bently Nevada series (e.g., 7200 Series) will produce an uncalibrated output.

System Integration Benefits

• Deterministic real-time response: The DC-to-10 kHz flat frequency response ensures that all vibration harmonics up to the 10th order of a 60,000 RPM machine are captured without phase distortion, preserving the integrity of orbit and spectrum data used in fault diagnosis.
• Direct 3500 Series monitor compatibility: The probe output is directly compatible with the 3500/40M and 3500/42M Proximitor/Seismic Monitor cards without signal conditioning adapters, reducing wiring complexity and eliminating additional failure points in the measurement chain.
• Diagnostic transparency via gap voltage monitoring: The −2 VDC to −18 VDC output range allows the 3500 monitor to continuously verify probe installation gap. A gap voltage outside the linear range triggers a Not OK (NOK) alert, providing immediate indication of probe fouling, shaft contact, or mounting looseness before a measurement error propagates to a false trip.
• API 670 compliance for insurance and regulatory acceptance: Installations using 330104-00-03-90-11-00 in a properly configured 3500 system satisfy the API 670 5th Edition requirements for radial vibration and position measurement, which is a contractual requirement for many power generation and petrochemical plant operators.
• Hazardous area deployment: ATEX/IECEx-rated variants are available for Zone 1/Zone 2 installations. The intrinsically safe design, when used with approved Zener barriers, limits energy in the probe circuit below the ignition threshold for the specified gas group, enabling installation in hydrogen-cooled generators and hydrocarbon processing environments.
• Reduced maintenance interval: Non-contact operation eliminates the periodic replacement cycles associated with contact-type sensors. In a typical baseload power plant operating 8,000 hours per year, the absence of mechanical wear translates to a maintenance interval measured in years rather than months.
• Scalable system architecture: The 3300 XL probe is the field element of a modular system. Extension cables, Proximitor sensors, and monitor cards can be replaced or upgraded independently without disturbing the probe installation, protecting the capital investment in probe mounting hardware and shaft preparation.
• Unified calibration traceability: Each probe ships with factory calibration data traceable to NIST standards. The calibration certificate documents the as-built scale factor and linearity, providing the baseline reference for periodic system verification required by ISO 13373-3 condition monitoring programs.

Quality Assurance & Global Logistics

Every 330104-00-03-90-11-00 unit supplied by siemensplc.com is sourced as genuine Bently Nevada (Baker Hughes) hardware through verified procurement channels. Each unit undergoes a multi-point inspection covering housing integrity, connector pin condition, cable jacket continuity, and label conformance against the OEM part number matrix before it is accepted into inventory. Units that do not pass inspection are quarantined and returned; no non-conforming stock enters the dispatch queue.

Shipments originate from our warehouse in Xiamen, China — a major international logistics hub with direct access to DHL Express, FedEx International Priority, UPS Worldwide Express, and sea freight consolidation services. In-stock orders are typically dispatched within 1–2 business days of payment confirmation. Transit times to major destinations: USA/Canada 3–5 business days (air express); EU 3–5 business days (air express); Middle East 2–4 business days; Southeast Asia 1–3 business days. Expedited same-day dispatch is available for orders confirmed before 14:00 CST.

All export documentation — commercial invoice, packing list, certificate of conformance, and HS code declaration (HS 9031.80) — is prepared as standard. For projects requiring ATEX documentation, material test reports, or third-party inspection, please advise at the time of inquiry. Packaging uses anti-static foam-lined boxes with moisture barrier film, rated for both air and sea freight handling conditions.

A 12-month warranty against manufacturing defects is provided on all units. Warranty claims are assessed within 5 business days of receipt of the returned unit; confirmed defective units are replaced at no charge with equivalent or superior specification hardware.

Contact Information

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