Bently Nevada 330904-02-10-70-01-00 Proximity Transducer – 3300 XL Series

Bently Nevada 330904-02-10-70-01-00 — Eddy-Current Proximity Transducer for Critical Machinery Protection

The Bently Nevada 330904-02-10-70-01-00 is a field-proven eddy-current proximity transducer belonging to the 3300 XL 8mm Series, a platform engineered specifically for continuous, non-contact measurement of shaft radial vibration, axial position, and differential expansion in turbomachinery protection systems. Unlike general-purpose inductive sensors, this transducer operates on the principle of electromagnetic induction loss: a high-frequency oscillating field (typically 1.0 MHz) is generated at the probe tip coil, and the resulting eddy-current damping effect on a conductive target surface produces a proportional DC voltage output. This mechanism delivers sub-micron displacement resolution without mechanical contact, making it the preferred sensing technology for API 670-compliant machinery protection installations.

In a standard 3300 XL system loop, the 330904-02-10-70-01-00 probe interfaces with a matched Proximitor® signal conditioner via a coaxial extension cable. The Proximitor converts the probe’s impedance variation into a calibrated linear voltage output of −18 VDC nominal at the midpoint of the linear range, with a sensitivity of 200 mV/mil (7.87 V/mm). This output feeds directly into Bently Nevada 3500 Series monitor cards or third-party DCS analog input modules, enabling real-time vibration amplitude trending, alarm threshold enforcement, and machinery trip logic execution — all within deterministic scan cycles.

The 330904-02-10-70-01-00 part number encodes specific mechanical and electrical configuration parameters: probe body diameter (8 mm), cable length (10 ft / ~3 m integral cable), and connector type. This configuration is widely deployed in steam turbine bearing housings, centrifugal compressor journal bearing pedestals, and boiler feed pump shaft monitoring points where radial clearance measurement accuracy directly governs machinery availability and mean time between failures (MTBF).

siemensplc.com maintains verified stock of the 330904-02-10-70-01-00 sourced through traceable industrial channels. Each unit is inspected for label integrity, coil continuity, and connector condition prior to dispatch from our Xiamen, China logistics hub. Fast international shipping via DHL Express and FedEx International Priority ensures delivery to plant maintenance teams within 3–7 business days globally.

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

Technical Parameters

Hardware Logical Analysis

The 330904-02-10-70-01-00 probe coil assembly is wound on a ferrite core and encapsulated in a thermoplastic housing rated to 177°C continuous exposure. The coil’s resonant frequency is factory-trimmed to match the 3300 XL Proximitor oscillator circuit, ensuring the system operates within the calibrated linear range without field adjustment. This factory-matched pairing eliminates the gain drift that occurs when mixing probe and Proximitor units from different calibration batches — a common source of measurement error in field-assembled systems.

From an EMC standpoint, the coaxial cable architecture provides inherent common-mode noise rejection. The outer shield is grounded at the Proximitor end only (single-point grounding), preventing ground loop currents that would otherwise appear as low-frequency noise on the vibration signal. In environments with high variable-frequency drive (VFD) switching noise or adjacent high-current bus bars, this single-point shield topology maintains signal integrity at the sub-millivolt level — critical for detecting early-stage bearing wear signatures at amplitudes below 1 mil pk-pk.

The probe tip geometry is optimized for a target gap of 1.27 mm (50 mil) at the electrical center of the linear range. At this nominal gap, the output is −12 VDC, providing symmetric headroom of approximately 6 V in both the approach and recession directions before the signal clips at the Proximitor output limits. This symmetric headroom is essential for accurate orbit plot reconstruction in two-probe radial vibration measurement configurations, where X-Y probe pairs must maintain matched sensitivity and phase response across the full vibration amplitude range.

The integral cable construction — where the probe coil and extension cable are factory-assembled as a single unit — eliminates the impedance discontinuity that occurs at field-assembled probe-to-extension-cable junctions. Impedance mismatches at these junctions introduce standing wave reflections that distort the high-frequency carrier signal, degrading sensitivity calibration by up to 3–5% in worst-case installations. The 330904-02-10-70-01-00’s integral design removes this variable entirely, delivering consistent sensitivity across all installation geometries.

System Integration Benefits

• Direct API 670 Compliance: The 3300 XL system, anchored by this probe, meets API 670 5th Edition requirements for radial vibration, axial position, and speed measurement — eliminating the need for additional signal conditioning hardware to satisfy machinery protection standards in oil & gas and power generation facilities.
• Deterministic Scan Cycle Compatibility: The DC-coupled output (DC to 10,000 Hz) is compatible with 3500 Series monitor cards operating at 1 ms scan intervals, ensuring that transient vibration events — such as rub-induced subsynchronous components — are captured without aliasing artifacts.
• Plug-and-Play 3500 Series Integration: The probe’s calibrated sensitivity matches the 3500/42M and 3500/45 monitor card input scaling, requiring no field calibration after installation. Alarm and trip setpoints configured in the monitor are immediately valid upon probe connection.
• DCS Analog Input Compatibility: The −18 VDC nominal output is within the input range of standard ±10 V or 4–20 mA (via I/V converter) analog input modules on Emerson DeltaV, Honeywell Experion PKS, ABB 800xA, and Yokogawa CENTUM VP platforms, enabling vibration data integration into plant-wide process historians without additional signal converters.
• Diagnostic Transparency via Gap Voltage Monitoring: The DC component of the Proximitor output provides a continuous, real-time indication of probe-to-shaft gap. Trending this DC gap voltage in the DCS historian allows maintenance engineers to detect shaft centerline migration, bearing wear progression, and thermal growth deviations — all without interrupting production.
• Redundant Measurement Architecture Support: The probe’s compact 8 mm tip diameter allows dual-probe installation in standard bearing housing probe ports, supporting 1oo2 (one-out-of-two) voting logic configurations for high-availability machinery protection systems where spurious trips must be minimized.
• High-Temperature Turbine Application Suitability: The 177°C probe body rating covers the bearing housing temperatures encountered in HP/IP steam turbine applications operating at inlet steam conditions up to 600°C / 250 bar, where bearing metal temperatures at the probe mounting location typically range from 80°C to 150°C under full-load conditions.
• Minimal Maintenance Footprint: The non-contact sensing principle eliminates mechanical wear, and the IP67-rated probe body resists oil mist, steam condensate, and cleaning solvent ingress — reducing scheduled maintenance interventions to periodic gap verification checks during planned outages rather than continuous replacement cycles.

Quality Assurance & Global Logistics

Every Bently Nevada 330904-02-10-70-01-00 unit supplied by siemensplc.com is sourced through verified industrial channels with full lot traceability. Pre-shipment inspection covers label authenticity, coil DC resistance measurement (nominal 4–6 Ω for 8 mm probes), connector pin integrity, and cable jacket condition. Units failing any inspection criterion are quarantined and not dispatched.

Shipments originate from our Xiamen, China warehouse, strategically positioned for efficient access to major international freight hubs including Xiamen Gaoqi International Airport (XMN) and Xiamen Port. Standard export documentation — commercial invoice, packing list, certificate of origin, and material safety data sheet — is prepared for every order. HS Code 9031.80 applies for customs classification. DHL Express and FedEx International Priority services deliver to North America, Europe, Southeast Asia, the Middle East, and South America within 3–7 business days. Sea freight consolidation is available for bulk orders exceeding 50 units. 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
© 2026 siemensplc.com. All rights reserved.