Bently Nevada 330904-00-06-10-02-00 Proximity Probe – 3300 XL Series

Bently Nevada 330904-00-06-10-02-00 — 8 mm Eddy-Current Proximity Probe for Critical Rotating Machinery Protection

The Bently Nevada 330904-00-06-10-02-00 is a 6-inch (152 mm), 8 mm tip-diameter eddy-current proximity probe belonging to the 3300 XL Series — Bently Nevada’s field-proven platform for non-contact shaft vibration and position measurement on turbomachinery and other critical rotating assets. Unlike capacitive or optical displacement sensors, the eddy-current operating principle imposes no mechanical load on the target shaft, eliminating wear-induced drift over the service life of the measurement chain. The probe operates as the primary transducer in a three-component system: probe body, extension cable, and oscillator-demodulator (driver). The 330904-00-06-10-02-00 is factory-calibrated for use with the Bently Nevada 330180-X1-05 driver against AISI 4140 steel targets, delivering a linear output of 200 mV/mil (7.87 V/mm) across a 0–200 mil (0–5.08 mm) measurement gap range.

In a typical API 670-compliant machinery protection loop, this probe mounts radially at the bearing journal to capture shaft orbital motion. The analog voltage output feeds directly into a Bently Nevada 3500-series monitor rack — such as the 3500/42M Proximitor/Seismic Monitor — where the signal is processed for 1× and 2× vibration amplitude, DC gap voltage (used as a proxy for axial position or bearing wear), and phase reference when paired with a Keyphasor® transducer. The deterministic, low-latency signal path from probe tip to relay output is what makes this measurement chain the reference standard in API 670 machinery protection.

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Technical Parameters

Hardware Logical Analysis

The 330904-00-06-10-02-00 probe tip houses a precision-wound coil embedded in a thermally stable epoxy matrix. When energized by the 330180-X1-05 driver at its nominal carrier frequency (approximately 1.0 MHz), the coil generates an alternating electromagnetic field that penetrates the conductive target surface. Eddy currents induced in the target create a back-EMF that loads the coil, shifting its impedance as a function of the air gap distance. The driver demodulates this impedance shift into a DC-proportional voltage output — the core transduction mechanism that achieves sub-micron resolution without physical contact.

EMC and Shielding Architecture: The integral armored cable uses a tri-axial construction: the inner conductor carries the high-frequency carrier signal, the intermediate shield is driven at the same potential as the inner conductor (guard-driven topology) to eliminate cable capacitance loading, and the outer shield provides low-impedance grounding to chassis. This architecture suppresses common-mode interference from variable-frequency drives (VFDs), high-current bus bars, and RF sources common in turbomachinery enclosures — environments where radiated EMI can exceed 10 V/m at frequencies up to 1 GHz.

Thermal Stability: The 3300 XL probe body is rated to +177°C continuous, which covers the bearing housing temperatures encountered in steam turbine LP/HP sections and hot-gas expanders. The epoxy encapsulant has a glass transition temperature (Tg) well above this operating ceiling, preventing coil geometry distortion that would shift the scale factor. Factory calibration data is traceable to NIST-referenced standards, and the scale factor tolerance of ±1% is maintained across the full −35°C to +177°C range.

Target Material Sensitivity: The probe is factory-calibrated for AISI 4140 steel. Shafts machined from alternative alloys (e.g., 17-4 PH stainless, Inconel 718) exhibit different electrical conductivity and magnetic permeability, which shifts the effective scale factor. Bently Nevada publishes correction curves for common shaft materials; these must be applied at the driver level or in the System 1 software configuration to maintain measurement accuracy within API 670 alarm setpoint tolerances.

System Integration Benefits

• Deterministic signal latency: The analog output path from probe tip to monitor relay introduces less than 1 ms of group delay across the 0–10 kHz bandwidth, preserving phase fidelity for synchronous vibration analysis and Keyphasor®-referenced 1×/2× vector computation.
• Direct API 670 compliance: The 330904-00-06-10-02-00 meets all transducer requirements of API 670 5th Edition for radial vibration and axial position measurement, simplifying documentation for new-unit acceptance testing and insurance audits.
• Plug-and-play replacement: The MIL-C-5015 connector and 8 mm probe body geometry are dimensionally identical to all previous 3300 XL 8 mm probes, allowing in-situ replacement without re-machining probe holders or re-routing cable trays.
• Dual-use measurement: A single probe simultaneously provides radial vibration amplitude (AC component) and bearing clearance / shaft centerline position (DC component), reducing the total transducer count per bearing journal compared to separate vibration and position sensors.
• System 1 software integration: The probe’s calibrated scale factor is natively recognized by Bently Nevada System 1 v7.x and TDXnet, enabling automatic engineering-unit conversion, trend logging, and alarm management without manual scaling configuration.
• Hazardous area compatibility: CSA and FM intrinsically safe (IS) configurations are available, allowing deployment in Zone 1 / Class I Division 1 environments (hydrogen-cooled generators, offshore platforms) with appropriate IS barriers.
• Diagnostic transparency: The DC gap voltage output provides a continuous, real-time indicator of bearing wear progression. A shift of more than 10 mil from the baseline gap value typically signals bearing pad erosion or shaft bow — detectable months before a vibration alarm threshold is reached.
• Reduced commissioning time: Factory-calibrated scale factor eliminates field calibration procedures. The probe can be installed, gapped to 50 mil nominal, and placed in service immediately after verifying the driver output voltage against the calibration sheet — a process that takes under 30 minutes per measurement point.

Quality Assurance & Global Logistics

Every 330904-00-06-10-02-00 unit supplied by siemensplc.com is sourced as genuine Bently Nevada (Baker Hughes) OEM stock. Units are stored in a climate-controlled warehouse in Xiamen, China, maintaining temperature and humidity within OEM storage specifications to prevent coil oxidation and connector corrosion. Prior to dispatch, each probe undergoes a bench verification: the integral cable is continuity-tested, the connector pins are inspected under 10× magnification, and the probe body is checked for physical damage. A certificate of conformance and traceability record accompany every shipment.

Logistics from Xiamen cover all major global destinations. Standard air freight to Europe, the Middle East, and Southeast Asia typically clears customs within 5–7 business days. Expedited DHL/FedEx Priority options achieve 2–3 business day delivery to most destinations. All export documentation — commercial invoice, packing list, country-of-origin certificate, and ECCN classification — is prepared in-house to minimize customs clearance delays. Anti-static foam-lined packaging with OEM-style labeling is used for all shipments to protect the probe tip and cable assembly during transit.

Contact Information

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