Bently Nevada 330104-00-11-10-01-05 Proximity Probe – 3300 XL Series

Bently Nevada 330104-00-11-10-01-05 — Non-Contact Shaft Measurement in High-Temperature Rotating Machinery

The 330104-00-11-10-01-05 is an 8 mm eddy-current proximity probe within Bently Nevada’s 3300 XL Transducer System. It performs continuous, non-contact measurement of radial shaft vibration, axial thrust position, and differential expansion across a broad class of turbomachinery. The probe operates on the principle of electromagnetic induction: a high-frequency oscillator (typically 1.0 MHz) drives a coil wound at the probe tip, generating an alternating magnetic field. When a conductive target — the rotating shaft — enters this field, eddy currents are induced on the shaft surface, loading the oscillator circuit. The resulting change in oscillator amplitude is demodulated by the paired 3300 XL Proximitor® sensor into a DC voltage proportional to the gap distance, at a nominal sensitivity of 7.87 V/mm (200 mV/mil).

The M10 × 1 metric thread body allows direct installation into existing metric probe bosses without re-machining the bearing housing. The 11 mm tip-to-shoulder dimension and 1.0 m integral armored cable are factory-matched to the 3300 XL calibration curve, ensuring measurement accuracy without field recalibration. The probe tip is rated to +177 °C continuous, covering the bearing housing temperatures encountered in steam turbine hot-end applications and gas turbine compressor sections.

This model is specified in API 670 (5th Edition) machinery protection systems for steam turbines, gas turbines, centrifugal compressors, and large pumps in oil & gas, power generation, petrochemical, and LNG facilities. It is also deployed in steel mill drives, marine propulsion shafting, and high-speed test rigs where non-contact measurement is mandatory to avoid shaft contact damage.

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

Technical Parameters

Hardware Logical Analysis

The 3300 XL probe-and-Proximitor system is a tightly coupled analog measurement chain. Understanding its hardware logic is essential for correct installation and fault diagnosis.

Oscillator-Coil Coupling: The probe coil is wound on a ferrite core and encapsulated in a thermally stable ceramic compound. The encapsulant maintains coil geometry — and therefore calibration — across the full –35 °C to +177 °C operating range. Thermal expansion of the coil former is constrained to less than 0.5% dimensional change across this range, which translates to a sensitivity drift of <0.1% per 10 °C — well within API 670 accuracy requirements.

EMC Design: The integral armored cable uses a double-shielded coaxial construction: an inner shield referenced to the oscillator ground and an outer armor bonded to the probe body. This arrangement provides >60 dB common-mode rejection of plant-frequency interference (50/60 Hz and harmonics) and attenuates radio-frequency ingress from variable-frequency drives operating in the 2–20 kHz switching range. The probe body is stainless steel, providing a Faraday enclosure for the coil assembly.

Target Material Sensitivity: The eddy-current depth of penetration (skin depth δ) is a function of target resistivity and oscillator frequency: δ = √(ρ / πfμ). For AISI 4140 at 1 MHz, δ ≈ 0.08 mm, meaning the measurement is sensitive only to the outermost surface layer of the shaft. This makes the probe immune to subsurface shaft defects but requires that the shaft surface in the measurement zone be free of plating, coatings, or hardened layers that differ in resistivity from the calibration target. For non-standard shaft materials (stainless, Inconel, titanium), a material correction factor must be applied or a custom calibration ordered from the factory.

Proximitor Demodulation: The 3300 XL Proximitor® sensor contains the oscillator driver, amplitude demodulator, and output buffer. The probe is a passive element — it contains no active electronics. This architecture places all temperature-sensitive circuitry in the Proximitor, which is mounted remotely from the bearing housing in a conditioned junction box. The probe itself can therefore tolerate the full bearing housing temperature without electronic degradation.

Cable Length Matching: The 3300 XL calibration is performed for a specific total cable length (probe integral cable + extension cable). The -05 suffix in this part number denotes a 5 m total system cable length. Substituting an extension cable of different length without recalibration will shift the oscillator loading and introduce a systematic gap error. Always verify total cable length matches the Proximitor calibration record.

System Integration Benefits

• Direct metric boss compatibility: M10 × 1 thread eliminates adapter fittings and associated mechanical play, maintaining probe-to-shaft gap repeatability to ±0.01 mm across maintenance cycles.
• Zero-contact measurement: No mechanical wear on the probe or shaft surface; mean time between maintenance intervals exceeds 10 years in clean industrial environments.
• DC-to-10 kHz bandwidth: Captures both slow-roll runout (sub-1 Hz) and high-frequency gear mesh or blade-pass events in a single channel, eliminating the need for separate AC and DC measurement paths.
• API 670 compliance: Satisfies the transducer performance requirements of the machinery protection standard mandated by EPC contractors and end-users in oil & gas and power generation globally.
• 3500 Series rack integration: Output signal is directly compatible with Bently Nevada 3500/40M and 3500/42M monitor cards, enabling plug-and-play replacement without rack reconfiguration or software changes.
• Deterministic analog output: The DC voltage output has no digital latency or protocol overhead; the Proximitor output updates continuously at the oscillator demodulation rate (>100 kHz effective sample rate), providing true real-time gap data to the monitor card.
• Diagnostic transparency: The 3300 XL system provides a buffered output (BNC) on the Proximitor for direct oscilloscope access to the raw vibration waveform, enabling time-waveform analysis and orbit plot construction without interrupting the protection channel.
• ATEX/IECEx zone compatibility: When used as part of a certified 3300 XL system assembly, the probe is approved for installation in Zone 1 (gas) and Zone 21 (dust) hazardous areas, covering the majority of petrochemical and offshore applications.
• Redundant measurement architecture: Two probes mounted 90° apart (X-Y configuration) per API 670 provide full shaft orbit reconstruction, enabling separation of unbalance, misalignment, and rub signatures in the frequency domain.
• Long-term calibration stability: Factory calibration data is traceable to NIST standards; the ceramic-encapsulated coil assembly maintains sensitivity within ±1% of nominal over a 5-year service interval under normal operating conditions.

Quality Assurance & Global Logistics

Every 330104-00-11-10-01-05 unit supplied by siemensplc.com is sourced through verified industrial distribution channels with full OEM traceability. Pre-shipment inspection covers connector integrity, cable armor continuity, OEM part number label verification, and packaging condition. Certificate of Conformance (CoC) documentation is available on request for critical applications requiring procurement audit trails.

Shipments originate from Xiamen, China — a major international logistics hub with direct air freight connections to Singapore, Dubai, Frankfurt, Los Angeles, and Tokyo. Standard delivery timelines are 3–7 business days to Southeast Asia and the Middle East, 5–10 business days to Europe and North America, and 7–14 business days to South America and Africa. DHL Express, FedEx International Priority, and UPS Worldwide Express are available for time-critical orders. All shipments include tracking and commercial invoice documentation compliant with customs requirements in the destination country. Export classification and HS code documentation are provided for each shipment.

Contact Information

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