Bently Nevada 330104-13-20-10-02-00 Proximity Probe – 3300 XL Series

Bently Nevada 330104-13-20-10-02-00 — 3300 XL 8 mm Eddy-Current Proximity Probe in Rotating Machinery Monitoring Loops

The Bently Nevada 330104-13-20-10-02-00 is an 8 mm eddy-current proximity probe belonging to the 3300 XL Proximity Transducer System. Within a condition-monitoring control loop, this probe functions as the primary sensing element: it converts the mechanical displacement of a rotating shaft into a proportional DC voltage signal, which downstream monitors and protection systems use to evaluate radial vibration amplitude, shaft centerline position, and eccentricity. The 3300 XL platform was engineered to deliver tighter sensitivity tolerances and extended temperature performance compared to its predecessor 3300 series, making it the preferred transducer for high-speed turbomachinery, centrifugal compressors, and large induction motors where sub-micron displacement resolution is operationally critical.

The probe operates on the eddy-current (electromagnetic induction) principle: a high-frequency oscillator within the paired driver/oscillator-demodulator (e.g., 330180 series) drives an RF signal through the probe’s internal coil. When a conductive target surface approaches the probe tip, eddy currents are induced in the target, loading the coil and reducing its effective inductance. The driver circuit converts this impedance change into a linear DC output voltage. The 330104-13-20-10-02-00 is factory-calibrated for AISI 4140 steel targets; for non-standard target materials, a field recalibration against the driver is required to maintain accuracy within the ±1% linearity specification.

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Technical Parameters

Hardware Logical Analysis

The 330104-13-20-10-02-00 integrates several hardware design decisions that directly affect measurement fidelity in electrically noisy industrial environments.

Coil Geometry and Gap Sensitivity Linearity: The 8 mm tip diameter defines the effective sensing field diameter, which is approximately 2× the probe tip diameter — roughly 16 mm. This geometry produces a well-defined linear measurement zone of 0.25–2.26 mm. The coil winding density and ferrite core geometry are matched to the 330180-series driver’s oscillator frequency (typically 1.0 MHz nominal), ensuring the LC resonance point falls within the driver’s tracking range across the full operating temperature band. Thermal drift of coil inductance is compensated by the driver’s automatic gain control (AGC) circuitry, maintaining sensitivity within ±0.5% across the −35 °C to +177 °C range.

EMC Design and Shielding Architecture: The probe cable employs a triaxial shielding arrangement: the inner conductor carries the RF signal, the inner shield is driven at the same potential as the signal conductor (guard drive) to eliminate cable capacitance loading, and the outer shield provides low-impedance grounding to chassis. This guard-drive topology reduces the effective cable capacitance seen by the oscillator from hundreds of picofarads to near-zero, preserving frequency response flatness to 10 kHz even with 2-meter cable runs. In high-EMI environments (variable-frequency drives, arc furnaces), the outer shield’s low-impedance path to ground attenuates common-mode interference by >40 dB at frequencies up to 100 MHz.

Stainless Steel Housing and Pressure Integrity: The 316 stainless steel body provides corrosion resistance in H₂S-bearing atmospheres and hydrocarbon condensate environments typical of oil & gas installations. The IP67 rating confirms the probe body withstands temporary immersion, relevant in applications where lube oil mist or wash-down conditions exist. The threaded mounting body (M10×1.0 metric thread) allows precise gap adjustment with a resolution of 1.0 mm per full rotation, enabling field technicians to set the initial gap to the midpoint of the linear range (approximately 1.25 mm) without specialized tooling.

System Cable Length Matching: The 3300 XL system requires that the total cable length (probe cable + extension cable) match the driver’s calibration. The 330104-13-20-10-02-00 is configured for a 2.0 m total system cable length. Substituting extension cables of different lengths without recalibrating the driver will shift the output voltage by a predictable offset proportional to the cable’s distributed capacitance change, introducing a static measurement error. This is a hardware constraint, not a firmware parameter — field engineers must verify total cable length before commissioning.

System Integration Benefits

• Direct API compatibility with 3500 Series monitors: The 330104-13-20-10-02-00 output signal is within the input voltage window of Bently Nevada 3500/40M and 3500/42M vibration monitor cards, eliminating signal conditioning adapters and reducing loop latency to under 1 ms from shaft displacement to monitor alarm output.
• Non-contact measurement eliminates mechanical wear: Unlike contact-type displacement sensors, the eddy-current probe introduces zero mechanical load on the shaft. This is critical for high-speed rotors (>10,000 RPM) where contact sensors would induce measurable drag torque and accelerate surface wear.
• Deterministic frequency response to 10 kHz: The flat −3 dB bandwidth to 10,000 Hz captures sub-synchronous instabilities (oil whirl at 0.43–0.48× running speed), synchronous 1× imbalance, and higher-order harmonics up to the 10th order at 60,000 RPM, providing complete spectral coverage for turbomachinery diagnostics.
• Dual-plane radial vibration measurement: Deploying two probes at 90° (X-Y configuration) per bearing journal enables full orbital plot reconstruction, allowing engineers to distinguish between pure imbalance (circular orbit) and misalignment or rub (elliptical or figure-8 orbit) without removing the machine from service.
• Integrated system diagnostics via driver output: The 330180 driver provides a buffered output that can be monitored by a DCS or SCADA system in parallel with the protection monitor. This allows continuous trending of gap voltage (DC component) to detect bearing wear or thermal growth before alarm thresholds are reached.
• Keyphasor phase reference compatibility: When used as a phase reference probe (Keyphasor), the 330104-13-20-10-02-00 generates a once-per-revolution trigger pulse as the shaft notch or key passes the probe face. This pulse synchronizes the vibration monitor’s vector filtering, enabling synchronous time averaging and phase-referenced amplitude measurements accurate to ±1° of shaft angle.
• Wide temperature range supports hot-section installations: The −35 °C to +177 °C operating range covers bearing housing temperatures in gas turbines and steam turbines without requiring thermal standoffs or active cooling, simplifying mechanical installation and reducing potential leak paths.
• Reduced commissioning time through factory calibration: Each probe is factory-calibrated as a matched system with its designated driver. The calibration data (sensitivity, linear range, gap voltage at midpoint) is documented on the unit’s calibration certificate, allowing technicians to verify system performance against factory baseline during commissioning without performing a full field calibration sweep.

Quality Assurance & Global Logistics

Every Bently Nevada 330104-13-20-10-02-00 unit dispatched from our Xiamen, China facility is a genuine OEM component sourced through verified distribution channels. Our procurement team cross-references batch documentation, date codes, and label typography against Bently Nevada’s published authentication criteria before any unit enters our inventory. We do not handle rebranded, refurbished, or counterfeit parts.

Pre-shipment inspection protocol: Visual inspection of housing, cable jacket, and connector; label and date-code verification; output voltage spot-check at nominal −24 VDC supply; packaging integrity check. A packing list and inspection record accompany every shipment. Certificate of Conformance (CoC) is available upon request.

Logistics from Xiamen: Xiamen is a major international port city with direct air freight connections to DHL, FedEx, and UPS hubs. Standard export lead time for in-stock units is 2–5 business days door-to-door to Southeast Asia, Middle East, and Europe via DHL Express International Priority. North American destinations typically clear in 4–7 business days. Sea freight consolidation is available for bulk orders exceeding 20 units. All shipments include a commercial invoice, packing list, and certificate of origin suitable for customs clearance in all major import jurisdictions. Export compliance documentation is prepared in accordance with applicable trade regulations.

Warranty: 12 months from shipment date against manufacturing defects. Warranty claims are processed upon return of the defective unit with photographic evidence of the fault condition.

Contact Information

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