Bently Nevada 330104-05-17-10-11-05 Proximity Probe – 3300 XL Series

Bently Nevada 330104-05-17-10-11-05 — 8mm Eddy-Current Proximity Probe in the 3300 XL Transducer System

The Bently Nevada 330104-05-17-10-11-05 is a factory-calibrated, armored 8mm eddy-current proximity probe belonging to the 3300 XL Proximity Transducer System. It operates on the principle of electromagnetic induction: a high-frequency oscillating current (typically 1.0–1.5 MHz) is driven through the probe tip coil, generating an alternating magnetic field. When a conductive target — typically an AISI 4140 steel shaft — enters this field, eddy currents are induced on the target surface, loading the oscillator circuit and producing a proportional DC voltage output at the proximitor. The result is a continuous, non-contact displacement signal with a sensitivity of 7.87 V/mm (200 mV/mil) and a linear measurement range of 0.25 mm to 2.54 mm.

The part number suffix encodes the physical configuration: -05 (8mm probe body diameter), -17 (1.7 m integral probe cable), -10 (armored cable construction), -11 (standard connector), -05 (system cable length designation). This deterministic naming convention eliminates ambiguity during procurement and ensures exact system-level compatibility with the 3300 XL proximitor and downstream rack monitors.

Deployed across steam turbines, centrifugal compressors, boiler feed pumps, and large induction motors, this probe is a primary sensing element in API 670-compliant machinery protection architectures. Its frequency response of DC to 10,000 Hz covers the full spectrum of sub-synchronous instabilities, synchronous imbalance, and high-frequency structural resonances encountered in rotating equipment condition monitoring.

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Technical Parameters

Hardware Logical Analysis

The 330104-05-17-10-11-05 probe body is machined from 316 stainless steel, providing corrosion resistance in hydrocarbon and steam environments while maintaining dimensional stability under thermal cycling. The probe tip coil is wound on a ferrite core and encapsulated in a thermally stable epoxy compound rated to 177°C, preventing coil deformation under sustained high-temperature exposure — a failure mode common in lower-grade sensors operating near turbine bearing housings.

EMC Design: The armored cable construction (stainless steel braid, suffix -10) serves a dual function: mechanical protection against abrasion and vibration fatigue, and electromagnetic shielding. The shield is grounded at the proximitor end only (single-point grounding), eliminating ground-loop currents that would otherwise inject 50/60 Hz noise into the displacement signal. In environments with high variable-frequency drive (VFD) switching noise, this single-point shield topology maintains signal integrity without additional filtering hardware.

Oscillator Loading Mechanism: The eddy-current measurement principle is inherently self-referencing — the oscillator frequency and amplitude shift as a direct function of target distance, not as a function of supply voltage variation. This makes the output largely immune to power supply ripple within the specified –24 VDC ±10% tolerance band. The proximitor’s internal demodulator converts the AM-modulated RF carrier into a calibrated DC voltage, with the scale factor trimmed at the factory to the 7.87 V/mm nominal sensitivity.

Thermal Drift Compensation: The 3300 XL system’s calibration accounts for the temperature coefficient of the probe coil inductance. At elevated temperatures, coil resistance increases, slightly shifting the oscillator operating point. Bently Nevada’s factory calibration procedure characterizes each probe across the full temperature range, and the resulting correction coefficients are embedded in the proximitor’s analog signal conditioning chain, holding the scale factor error to <±0.5% across the rated temperature envelope.

Mechanical Mounting Geometry: The 8mm probe body accepts a standard M10×1.0 mounting thread, allowing installation in existing bearing housing bosses without machining modification. The 1.7 m integral cable (suffix -17) is sized for installations where the bearing housing-to-junction-box distance is short — typically pedestal-mounted equipment or machines with local junction boxes. For longer runs, a 330130-series extension cable is added between the probe connector and the proximitor input.

System Integration Benefits

• Deterministic Real-Time Response: The DC-to-10 kHz flat frequency response ensures that both quasi-static shaft position (DC component) and dynamic vibration events up to the 10th harmonic of a 1,000 RPM machine are captured without phase distortion, supporting accurate orbit plot reconstruction in the monitor.
• Non-Contact Measurement Eliminates Wear: Unlike contact-type displacement transducers, the eddy-current probe introduces zero mechanical load on the shaft. There is no wear surface, no lubrication requirement, and no contact fatigue — mean time between replacement is governed by environmental degradation, not mechanical wear cycles.
• Direct API 670 Compliance: The 3300 XL system is listed in API 670 Annex A as a qualified transducer system. Using this probe in a 3300 XL configuration satisfies the standard’s requirements for radial vibration, axial position, and differential expansion measurement without additional qualification testing.
• Integrated Diagnostics via Proximitor Output: The proximitor provides a continuous DC gap voltage output (nominally –10 VDC at mid-gap) that allows the DCS or monitor to detect probe-to-shaft gap faults — including probe pullout, shaft contact, and cable open-circuit — as distinct voltage excursions outside the linear range, enabling fault discrimination without additional hardware.
• Scalable System Architecture: The 330104 probe family spans cable lengths from 0.5 m to 9 m integral cable, with extension cables adding up to 9 m additional reach. A single proximitor model covers all cable length combinations within its calibrated system length, simplifying spare parts inventory management.
• High Immunity to Process Fluid Contamination: The IP67-rated probe body and PTFE-insulated, armored cable withstand continuous exposure to lubricating oil, steam condensate, and light hydrocarbon mist without signal degradation or insulation breakdown, eliminating the need for probe purging or protective sleeves in most applications.
• Backward Compatibility with 3500 Series Monitors: When paired with the 3500/42 proximitor module, the 330104-05-17-10-11-05 probe integrates directly into the Bently Nevada 3500 rack-based machinery protection system, providing a migration path from legacy 3300 installations to the 3500 platform without probe replacement.
• Calibration Traceability to NIST Standards: Each probe ships with a factory calibration certificate traceable to NIST measurement standards, satisfying the documentation requirements of ISO 9001 quality management systems and plant asset management programs that mandate calibration traceability for safety-instrumented loop components.

Quality Assurance & Global Logistics

Every Bently Nevada 330104-05-17-10-11-05 unit supplied through siemensplc.com is sourced from verified distribution channels with full documentation integrity. Incoming units undergo a structured inspection protocol: visual examination of probe body, cable armor, and connector; dimensional verification of probe tip diameter and thread form; and functional verification of gap voltage output at a known target distance using a calibrated test fixture. Units that do not meet OEM specification are quarantined and excluded from sale.

Shipments originate from our warehouse in Xiamen, China — a major international logistics hub with direct access to Xiamen Gaoqi International Airport and Xiamen Port. Standard export documentation accompanies every shipment: commercial invoice, packing list, certificate of origin, and calibration certificate. For regulated markets, ECCN classification documentation and end-user declaration templates are available upon request.

Typical dispatch lead time for in-stock units is 1–3 business days after order confirmation. International express freight (DHL, FedEx, UPS) delivers to most destinations within 3–7 business days. Sea freight consolidation is available for bulk orders. All units are packed in anti-static, shock-absorbing packaging to protect the probe tip and cable assembly during transit. A 12-month warranty covers manufacturing defects from the date of shipment.

Contact Information

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