Bently Nevada 330104-04-10-10-02-05 Proximity Probe – 3300 XL Series

Bently Nevada 330104-04-10-10-02-05 — 8mm Eddy-Current Proximity Probe for Continuous Shaft Monitoring

The Bently Nevada 330104-04-10-10-02-05 is an 8mm diameter eddy-current proximity probe belonging to the 3300 XL Series — a platform that has defined the benchmark for non-contact displacement measurement in rotating machinery protection systems for over three decades. This specific configuration encodes a 1.0 m integral cable, standard armoring, and a metric-thread tip body, making it a direct-fit replacement in API 670-compliant machinery protection loops without requiring driver recalibration.

In a typical turbomachinery protection architecture, the proximity probe occupies the first node in a three-component measurement chain: probe → extension cable → Proximitor® driver. The 330104-04-10-10-02-05 generates a high-frequency oscillating electromagnetic field (nominally 1.0 MHz carrier) at its tip. When a conductive target — typically a chrome-moly or 4140 steel shaft — enters the field, eddy currents are induced on the target surface, loading the oscillator circuit and producing a proportional DC voltage shift at the driver output. The resulting analog signal is linear across a defined gap range and is directly conditioned by the paired 330180 Proximitor® Sensor before being passed to the 3300/16 or 3500/42M monitor card.

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Technical Parameters

Hardware Logical Analysis

The 330104-04-10-10-02-05 probe body is machined from 316 stainless steel, providing inherent resistance to chloride-induced stress corrosion cracking — a critical property in steam turbine environments where condensate ingress is common. The tip face is precision-ground to maintain a flat sensing surface with a flatness tolerance of ±0.025 mm, which directly governs the linearity error budget across the 0.25–2.54 mm measurement range.

The integral coaxial cable uses a low-loss dielectric with a controlled characteristic impedance matched to the 330180 Proximitor® oscillator circuit. Any impedance mismatch introduced by cable substitution or field splicing degrades the carrier signal amplitude and shifts the static sensitivity coefficient away from the factory-calibrated 7.87 V/mm, producing a systematic measurement error that is not detectable by the monitor’s self-test routines. This is why Bently Nevada specifies the probe, extension cable, and driver as a matched system — the 330104-04-10-10-02-05 with its 1.0 m integral cable is designed to pair with a 330130-Series extension cable to reach the driver mounted outside the bearing housing.

From an EMC standpoint, the coaxial construction provides continuous 360° shielding from the probe tip to the driver input. The shield is grounded at the driver end only (single-point grounding), preventing ground-loop currents from modulating the carrier signal. In high-interference environments — such as variable-frequency drive (VFD) motor rooms or switchgear panels — this single-point shield topology suppresses common-mode noise injection by typically 40–60 dB across the 50 Hz to 10 kHz band, preserving measurement integrity at the sub-micron displacement level.

The M10 × 1.0 metric thread on the probe body allows precise gap adjustment in 1.0 mm per revolution increments. Combined with the 1.27 mm/revolution pitch of the locknut, field technicians can set the nominal 1.0 mm (40 mil) installation gap with a positioning resolution of approximately 0.05 mm per 18° of rotation — sufficient for repeatable gap setting without requiring a gap meter during routine replacement.

System Integration Benefits

• Zero-wear measurement principle: The non-contact eddy-current method eliminates probe-to-shaft mechanical contact, removing wear as a failure mode and enabling continuous operation across multi-year maintenance intervals without probe degradation.
• Direct API 670 compliance: The 3300 XL system architecture — probe, extension cable, Proximitor® driver, and monitor — is designed to satisfy API 670 Fifth Edition requirements for radial vibration, axial position, and differential expansion measurement without additional signal conditioning hardware.
• Deterministic analog output: The DC voltage output from the Proximitor® driver is a continuous, real-time analog signal with no sampling latency. This allows the 3300/16 or 3500/42M monitor to execute trip logic within its hardware-defined response time (typically <1 ms for danger-level events), independent of network or software scheduling delays.
• Matched-system calibration traceability: Factory calibration of the probe-driver pair is performed as a matched set, with the sensitivity coefficient (7.87 V/mm) traceable to NIST-referenced standards. Replacement with an identical part number preserves calibration without requiring field recalibration of the driver.
• Broad target material compatibility: While optimized for AISI 4140 steel, the 3300 XL probe system includes published target material correction factors for 17-4PH stainless, Inconel 718, and titanium alloys, enabling accurate measurement on non-standard shaft materials with a simple driver gain adjustment.
• High-temperature operational margin: The −35°C to +177°C probe body rating provides a 30–50°C thermal margin above typical bearing housing surface temperatures in gas turbine and steam turbine applications, preventing thermal-induced sensitivity drift during load transients.
• Diagnostic transparency via gap voltage monitoring: The static DC gap voltage output (nominally −10.0 VDC at 1.0 mm gap) is continuously available at the driver output terminal. Trending this value over time provides a direct indicator of shaft centerline migration, bearing wear, or probe mounting looseness — without requiring additional instrumentation.
• Seamless integration with System 1® software: When connected to a 3500 Series monitor rack, the probe signal is digitized and streamed to Bently Nevada System 1® condition monitoring software, enabling waveform capture, orbit plot generation, and spectral analysis at the full monitor sampling rate — typically 65,536 samples/second per channel.

Quality Assurance & Global Logistics

Every unit of the 330104-04-10-10-02-05 dispatched from our Xiamen, China facility undergoes a structured pre-shipment verification protocol. Physical inspection confirms housing integrity, connector seating, and cable jacket continuity. Label and date-code verification cross-references the manufacturer’s batch markings against OEM documentation to confirm part number authenticity. Where test equipment is available, probe tip impedance is measured to verify the oscillator loading characteristic falls within the factory-specified tolerance band.

Packaging follows anti-static and moisture-barrier standards: the probe is individually wrapped in ESD-safe foam, sealed in a moisture-barrier poly bag with desiccant, and placed in a rigid corrugated carton rated for international air freight handling. This packaging protocol is designed to withstand the mechanical shock and humidity excursions typical of DHL Express and FedEx International Priority transit from Xiamen to destinations in Europe, the Americas, Southeast Asia, and the Middle East.

Standard in-stock lead time is 3–7 business days from order confirmation to delivery. For emergency shutdown (ESD) or forced-outage situations, same-day dispatch is available for confirmed in-stock units with order placement before 14:00 CST. Export documentation — commercial invoice, packing list, certificate of origin, and MSDS where required — is prepared for all international shipments. A 12-month warranty covers manufacturing defects and functional non-conformance from the date of shipment.

Contact Information

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