Bently Nevada 330104-00-04-50-11-00 Proximity Probe – 3300 XL Series

Bently Nevada 330104-00-04-50-11-00 — Eddy-Current Proximity Probe for Rotating Machinery Shaft Monitoring

The Bently Nevada 330104-00-04-50-11-00 is a factory-calibrated, non-contact eddy-current proximity probe belonging to the 3300 XL measurement system. It is designed to deliver continuous, high-fidelity displacement signals from rotating shafts in turbomachinery, compressor trains, and heavy industrial drives. The probe operates on the principle of electromagnetic induction: a high-frequency oscillator within the matched Proximitor driver energizes the probe tip coil, generating an alternating magnetic field. When a conductive target (shaft) enters this field, eddy currents are induced on the target surface, loading the oscillator circuit. The resulting change in oscillator amplitude is demodulated into a DC-proportional voltage output — linearly correlated to the gap between probe tip and shaft surface.

This model encodes five critical configuration parameters in its part number: 0.5 m integral cable, 5.0 m extension cable, 8 mm probe tip diameter, M10×1 thread, and standard AISI 4140 steel calibration. The complete 5.5 m system length is factory-matched to the Proximitor driver, preserving the published 7.87 V/mm (200 mV/mil) sensitivity across the full linear range of 0.25 – 2.54 mm (10 – 100 mil) without field trimming.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

The 3300 XL probe architecture separates the oscillator electronics from the probe body, placing them inside the Proximitor driver module mounted in a climate-controlled instrument enclosure. This topology has two direct engineering consequences: the probe body itself contains only a passive wound coil and a precision coaxial transmission line, eliminating active components from the high-temperature zone near the bearing housing; and the oscillator frequency (nominally 1.0 MHz for the 8 mm tip) is stabilized by the driver’s temperature-compensated tank circuit rather than by any component exposed to process heat.

The stainless-steel armor on the integral cable serves a dual function. Mechanically, it resists crush loads and abrasion in congested machinery spaces where cable routing competes with piping and structural steel. Electrically, the armor acts as a Faraday shield, attenuating capacitively coupled interference from adjacent power cables and variable-frequency drives — a significant EMC advantage in environments where 480 V or 6.6 kV motor feeders run in parallel cable trays. The coaxial geometry of the signal conductor within the armor maintains a controlled characteristic impedance, preventing reflections that would distort the high-frequency carrier signal and introduce measurement error.

The DC-coupled output architecture is a deliberate design choice that distinguishes eddy-current proximity probes from velocity or acceleration transducers. Because the output voltage is proportional to instantaneous gap — not gap rate-of-change — the signal simultaneously encodes the static shaft centerline position (DC component) and the dynamic vibration orbit (AC component superimposed on the DC level). This allows a single probe channel to feed both the vibration monitor (bandpass-filtered AC path) and the shaft centerline plot algorithm (low-pass-filtered DC path) without additional transducers. In axial position applications, the same DC output directly represents thrust collar displacement relative to the bearing, enabling the monitor to generate both vibration alarms and axial position alarms from one physical measurement point.

The factory-matched calibration between probe, extension cable, and Proximitor driver is enforced by the part number structure. The extension cable’s distributed capacitance and inductance are characterized at the factory and compensated in the driver’s gain-setting network. Substituting an unmatched extension cable — even one of identical length — shifts the effective sensitivity by up to 3–5%, which at a 125 µm (5 mil) alarm setpoint represents a 3.75–6.25 µm measurement error. For API 670-compliant installations, this error is unacceptable; the matched-system approach eliminates it at the source.

System Integration Benefits

• Drop-in 3300 XL Compatibility: The probe mates directly with all 3300 XL Proximitor drivers (e.g., 330180-91-00) and integrates into Bently Nevada 3500-series monitor racks via standard 3500/40M or 3500/42M I/O modules — no rack reconfiguration, no re-cabling of the monitoring backplane.
• Deterministic Alarm Response: The DC-coupled, analog output path from probe to monitor introduces no digital latency. Alarm and trip relay response times are governed solely by the monitor’s configurable time-delay filters, not by A/D conversion or fieldbus scan cycles — critical for machinery protection where trip response must occur within one shaft revolution.
• Dual-Variable Single Channel: One probe channel simultaneously provides radial vibration (µm pk-pk) and shaft centerline position (µm DC offset), reducing channel count in the monitor rack and lowering installed cost per measurement point by approximately 40% compared to separate vibration and position transducers.
• High-Temperature Bearing Housing Reach: The 177 °C probe body rating covers steam turbine bearing housings operating at 150–160 °C ambient, eliminating the need for probe cooling assemblies or extended standoff brackets that introduce mechanical resonance into the measurement path.
• EMC Robustness in VFD-Dense Plants: The armored coaxial cable construction provides >40 dB common-mode rejection of conducted interference from variable-frequency drives operating at switching frequencies of 2–16 kHz — a measurable advantage in modern motor control centers where proximity probe cables share cable trays with VFD output conductors.
• API 670 Alarm Setpoint Traceability: Factory calibration documentation (sensitivity certificate, linearity data) ships with each unit, providing the traceability record required by API 670 Section 8.3 for alarm and trip setpoint verification during commissioning and periodic proof tests.
• Hazardous Area Deployment: ATEX/IECEx intrinsically safe variants of the 3300 XL system are available for Zone 1 and Zone 2 classified areas in petrochemical and LNG facilities, using the same probe body geometry and mounting thread — no mechanical redesign of the probe bracket required when upgrading from a general-purpose to an Ex-rated installation.
• Predictive Maintenance Data Density: The 10,000 Hz frequency response captures shaft vibration harmonics up to the 200th order at 3,000 RPM, providing sufficient spectral resolution for sub-synchronous instability detection (oil whirl, rotating stall) and high-frequency gear mesh analysis when the probe is used in conjunction with a spectrum analyzer or condition monitoring platform.

Quality Assurance & Global Logistics

Every Bently Nevada 330104-00-04-50-11-00 unit supplied through siemensplc.com is sourced as genuine OEM hardware. Units are accompanied by original manufacturer documentation including the calibration sensitivity certificate, serial number traceability record, and — where available — factory test data sheets. Prior to dispatch from our Xiamen, China facility, each probe undergoes incoming inspection covering visual integrity of the probe tip, cable armor, and connector; electrical continuity of the coaxial signal path; and insulation resistance verification between the signal conductor and armor shield.

Packaging follows OEM or equivalent standards: foam-lined, anti-static inner packaging protects the probe tip geometry and cable armor from transit deformation; outer cartons are rated for international air and sea freight handling. For cross-border shipments, we prepare a full commercial invoice, packing list, certificate of conformance, and HS code documentation (HS 9026.80 — instruments for measuring displacement) to facilitate customs clearance in the EU, North America, Southeast Asia, and the Middle East.

Xiamen’s geographic position provides direct access to major international freight hubs: Xiamen Gaoqi International Airport (XMN) for air express (DHL, FedEx, UPS — typical transit 2–5 business days to Europe and North America) and Xiamen Port for sea freight consolidation. Ex-stock orders placed before 14:00 CST are typically dispatched same day. Lead times for non-stock items are confirmed at the time of RFQ response, with most Bently Nevada 3300 XL components available within 3–10 business days from our regional supply network.

Contact Information

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