Bently Nevada 330904-05-14-05-02-05 Proximity Probe – 3300 XL Series

Bently Nevada 330904-05-14-05-02-05 — 8mm Eddy-Current Proximity Probe in the 3300 XL Transducer System

The Bently Nevada 330904-05-14-05-02-05 is a factory-calibrated, armored-cable eddy-current proximity probe belonging to the 3300 XL 8mm Proximity Transducer System. Its primary function within a machinery protection loop is to deliver a continuous, non-contact DC voltage signal proportional to the instantaneous gap between the probe tip and a conductive target surface — typically a rotating shaft journal. This signal feeds directly into a Proximitor® driver, which conditions and scales the output before passing it to a 3500 Series monitor for alarm evaluation, trip logic, and data archiving.

Within a closed-loop protection architecture, the probe occupies the first and most mechanically exposed node of the measurement chain. Its dimensional accuracy, thermal stability, and cable integrity determine the fidelity of every downstream decision — from operator alert thresholds to automatic turbine trip commands. The 330904 sub-series designation indicates an armored cable construction: a stainless-steel braid over the coaxial cable jacket that provides mechanical protection against abrasion, crush loads, and chemical exposure inside turbine pedestals and compressor casings.

The part number suffix -05-14-05-02-05 encodes the specific configuration: 5 m integral cable, 14 mm thread length, standard connector, armored jacket, and a calibration optimized for AISI 4140 steel targets. This deterministic part-number structure allows reliability engineers to specify exact replacement units without ambiguity across multi-unit plant fleets.

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

Technical Parameters

Hardware Logical Analysis

The operating principle of the 330904-05-14-05-02-05 is based on the Lenz’s law interaction between a high-frequency oscillating magnetic field — generated by the probe’s internal coil driven at approximately 1 MHz by the Proximitor — and the eddy currents induced in the conductive target surface. As the gap between probe tip and shaft decreases, eddy-current loading on the coil increases, reducing the oscillation amplitude. The Proximitor converts this amplitude change into a calibrated DC voltage output with a nominal scale factor of 7.87 V/mm.

The armored cable construction of the 330904 sub-series addresses a specific failure mode common in turbine installations: mechanical fatigue at the cable exit point caused by thermal cycling and vibration-induced flexure. The stainless-steel braid distributes bending stress over a longer cable segment, extending mean time between failures in environments where cable routing passes through hot zones or across structural members subject to differential thermal expansion.

The probe’s coil assembly is encapsulated in a thermally stable polymer compound that maintains dimensional integrity across the full –40°C to +177°C operating envelope. This encapsulation also provides the primary barrier against process fluid ingress — a critical requirement in wet-gas compressor applications where condensate accumulation at the probe mounting boss is routine.

EMC performance is achieved through the coaxial cable geometry, which provides inherent common-mode rejection of externally induced noise. The shield continuity from probe tip to Proximitor input connector ensures that high-frequency interference from variable-frequency drives, arc welding, and RF transmitters does not corrupt the low-level measurement signal. In installations where additional shielding is required, the armored outer braid can be grounded at a single point to prevent ground-loop currents from introducing a DC offset into the measurement.

The 14 mm thread length encoded in the part number suffix is matched to standard API 670 probe mounting bosses, allowing direct installation without adapter hardware. The thread engagement depth provides sufficient mechanical retention to resist probe ejection under the differential pressure conditions present in pressurized compressor casings.

System Integration Benefits

• Direct 3500 Series Compatibility: The 330904-05-14-05-02-05 is electrically and mechanically matched to the 3300 XL 8mm Proximitor driver (e.g., 330180-X1-05), which interfaces directly with 3500/40M and 3500/42M monitor modules. No signal conditioning adapters or impedance-matching networks are required.
• API 670 Compliance Out of the Box: The probe meets the transducer performance requirements of API 670 (5th Edition) without field calibration. This eliminates the commissioning step of verifying scale factor against a reference standard, reducing plant startup time on new installations.
• Deterministic Alarm and Trip Response: The flat frequency response from DC to 10,000 Hz ensures that both low-frequency shaft bow and high-frequency sub-synchronous instability events are captured within the same measurement channel, supporting accurate alarm discrimination without frequency-dependent gain errors.
• Non-Contact Operation Eliminates Wear-Based Drift: Unlike contact-type displacement sensors, the eddy-current probe introduces no mechanical load on the shaft and exhibits no wear-related sensitivity drift over its service life. Calibration stability over multi-year intervals reduces the frequency of scheduled recalibration outages.
• Armored Cable Reduces Unplanned Downtime: The stainless-steel cable armor provides a quantifiable improvement in cable service life in high-vibration, high-temperature installations. Fewer cable failures translate directly to fewer unplanned measurement channel outages and reduced maintenance labor costs.
• System 1 Software Integration: When connected through the 3500 rack, measurement data from this probe is available to Bently Nevada System 1 software for real-time orbit plot generation, trend analysis, and predictive maintenance scheduling. The probe’s calibrated output eliminates the need for software-side scale factor correction.
• Multi-Probe Orbit Measurement: Two probes mounted at 90° around a shaft journal — a standard API 670 configuration — provide the X-Y displacement data required to compute shaft orbit plots. The matched sensitivity of 3300 XL probes within a system ensures that orbit plots are geometrically accurate without per-channel correction factors.
• Hazardous Area Deployment: ATEX and IECEx certifications allow this probe to be installed in Zone 1 and Zone 2 classified areas when used with an approved intrinsically safe Proximitor. This eliminates the need for separate explosion-proof enclosures at the probe mounting location, reducing installation hardware costs in refinery and offshore applications.

Quality Assurance & Global Logistics

Every Bently Nevada 330904-05-14-05-02-05 unit supplied by siemensplc.com is sourced through verified industrial distribution channels and undergoes a structured incoming inspection process before dispatch. Inspection steps include visual examination of the probe tip and cable armor for transit damage, connector continuity verification, and cross-referencing of the unit’s label data against the ordered part number to confirm configuration accuracy.

Traceability documentation — including manufacturer lot codes and inspection records — is available upon request for customers operating under ISO 9001 or ASME quality management frameworks. Units are packaged in anti-static foam inserts within rigid outer cartons to prevent probe tip damage and connector contamination during international freight handling.

Dispatch is from our warehouse in Xiamen, China, with access to DHL Express, FedEx International Priority, and UPS Worldwide Expedited services. Standard in-stock orders are processed within 1–2 business days. Express delivery to major industrial hubs in Southeast Asia, the Middle East, Europe, and North America typically achieves 3–5 business day transit times. For project procurement requiring multiple units or coordinated delivery schedules, our logistics team can arrange consolidated shipments with advance tracking and customs documentation support.

All units carry a 12-month warranty from the date of shipment, covering manufacturing defects and factory calibration accuracy. Warranty claims are processed with a target response time of 48 hours from receipt of the defective unit.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
© 2026 siemensplc.com. All rights reserved.