Bently Nevada 330103-06-19-10-02-00 Proximity Transducer – 3300 XL Series

330103-06-19-10-02-00: Eddy-Current Displacement Transducer in Rotating Machinery Protection Loops

The Bently Nevada 330103-06-19-10-02-00 is a precision eddy-current proximity probe from the 3300 XL Series, designed for continuous non-contact measurement of shaft radial vibration, axial position, and differential expansion in critical rotating machinery. Operating on the principle of electromagnetic induction, the probe generates a high-frequency oscillating magnetic field (typically 1.0 MHz carrier) that induces eddy currents in the conductive target surface. The resulting impedance change in the probe coil is demodulated by the paired Proximitor® driver into a DC-proportional voltage output, delivering a linear displacement signal with a scale factor of 200 mV/mil (7.87 V/mm) across a calibrated gap range of 10–90 mil (0.25–2.29 mm).

Within a machinery protection architecture, this transducer occupies the first node of the measurement chain: probe → extension cable → Proximitor® driver → monitor rack. The 6 ft (1.83 m) integral armored cable and 19 ft (5.79 m) extension cable (matched pair) maintain system impedance within the tolerance band required for accurate scale factor delivery to the 3300 or 3500 series monitor. Any substitution of non-matched cable lengths invalidates the calibration and must be avoided in API 670-compliant installations.

The probe tip diameter and thread specification (M10 × 1.0 standard mount) allow direct installation into existing probe holders without machining modifications, making this part a verified drop-in replacement for worn or damaged 330103 probes in operating plants. The suffix structure -06-19-10-02-00 encodes: probe cable length (06 = 6 ft), extension cable length (19 = 19 ft), probe diameter (10 = 8 mm tip), connector type (02 = standard), and special options (00 = none). Specifying the full part number is mandatory to ensure dimensional and electrical compatibility with the installed Proximitor® driver.

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Technical Parameters

Hardware Logical Analysis

The 3300 XL probe architecture addresses three principal hardware challenges in industrial vibration measurement: signal integrity over long cable runs, thermal stability at elevated machine temperatures, and immunity to electromagnetic interference in high-voltage plant environments.

Matched Impedance Cable System: The probe coil, integral cable, and extension cable form a tuned LC network. The Proximitor® driver’s oscillator is calibrated to this specific impedance. Bently Nevada’s matched-pair approach ensures that the resonant frequency and Q-factor of the probe circuit remain within ±1% of nominal across the full cable length, directly controlling scale factor accuracy. Field-spliced or unmatched cables introduce parasitic capacitance that shifts the resonant point, producing a gain error that cannot be corrected by monitor span adjustment alone.

EMC Shielding Architecture: The integral cable uses a double-layer shield construction: an inner foil shield bonded to the probe body ground, and an outer braided shield connected at the Proximitor® end. This arrangement provides >60 dB of common-mode rejection against conducted interference from variable-frequency drives (VFDs) operating in the 2–20 kHz switching range, which is the dominant noise source in modern motor-driven compressor trains. The shield termination scheme prevents ground loops that would otherwise appear as low-frequency noise on the displacement signal.

Thermal Compensation: The probe coil is wound with a temperature-compensated alloy wire whose resistance coefficient is matched to the ferrite core’s permeability-temperature characteristic. This passive compensation maintains scale factor drift below ±0.5% across the full –30°C to +177°C probe tip operating range, eliminating the need for active temperature correction in the monitor. For steam turbine applications where probe tip temperatures can approach 150°C during startup transients, this passive stability is a critical reliability factor.

Mechanical Robustness: The probe body is machined from 316 stainless steel with a ceramic-filled epoxy tip encapsulant rated for continuous immersion in turbine lube oil and exposure to hydrogen sulfide (H₂S) concentrations typical of sour gas compressor environments. The M10 × 1.0 thread form is manufactured to a tolerance class that prevents galling during installation into stainless steel probe holders, a common failure mode with inferior aftermarket probes.

System Integration Benefits

• Direct API 670 5th Edition Compliance: The 330103-06-19-10-02-00 is listed in Bently Nevada’s API 670 compliance documentation, satisfying EPC contractor and end-user specification requirements without additional qualification testing. This eliminates procurement risk on capital projects where non-compliant instrumentation triggers formal deviation requests.
• Zero-Recalibration Drop-In Replacement: The probe’s scale factor (200 mV/mil) and linear range are factory-set to match the 3300 and 3500 monitor span configurations. Replacing a failed 330103 probe with this unit requires only gap adjustment to the nominal 50 mil (1.27 mm) center-of-range position; no monitor span or alert setpoint recalibration is required, reducing maintenance window duration.
• Deterministic DC-Coupled Output: The DC-proportional output voltage allows the monitor to resolve both static position (gap) and dynamic vibration (AC component) from a single signal path. This eliminates the need for separate position and vibration transducers on machines where both axial position and radial vibration must be monitored simultaneously, reducing wiring density and potential failure points.
• 10 kHz Flat Frequency Response: The –3 dB bandwidth of DC to 10,000 Hz captures sub-synchronous instabilities (oil whirl at 0.43–0.48× running speed), synchronous (1×) and super-synchronous (2×, 3×) components, and high-frequency blade-pass events in centrifugal compressors operating at speeds up to 20,000 RPM. This bandwidth is sufficient for full spectral analysis without anti-aliasing concerns at standard monitor sampling rates.
• Diagnostic Transparency via Gap Voltage: The DC gap voltage (nominally –10 VDC at 50 mil) provides a continuous, measurable indicator of probe-to-shaft clearance. Trending gap voltage over time reveals bearing wear (decreasing gap) or shaft thermal growth (changing axial position), enabling condition-based maintenance decisions before vibration amplitude alarms are reached.
• Compatibility with 3500 Series Rack Monitors: When paired with the appropriate Proximitor® driver (330180 series), the probe integrates directly with Bently Nevada 3500/42M, 3500/40M, and 3500/45 monitor modules. The 3500 rack’s per-channel OK relay and buffered output BNC connectors allow simultaneous connection to the protection system and a portable data collector for route-based vibration surveys without signal interruption.
• Hazardous Area Certification: ATEX and FM certifications (with the appropriate certified Proximitor® driver) permit installation in Zone 1 / Division 1 classified areas, including offshore platform machinery spaces and onshore gas processing facilities, without requiring additional intrinsic safety barriers in the signal loop.
• Long-Term Parts Availability: The 3300 XL probe form factor has been in continuous production for over two decades. The standardized M10 thread, coaxial connector, and matched cable system ensure that replacement probes will remain available and dimensionally compatible with existing probe holders and cable infrastructure for the foreseeable service life of installed machinery.

Quality Assurance & Global Logistics

Every Bently Nevada 330103-06-19-10-02-00 unit dispatched from our Xiamen, China facility is sourced from verified supply channels and subjected to a structured pre-shipment inspection protocol. Visual examination confirms OEM labeling integrity, connector condition, and cable jacket continuity. Functional verification measures the probe’s open-circuit inductance and DC resistance against the published 3300 XL probe specification table, confirming coil integrity before packaging. Units exhibiting out-of-tolerance readings are quarantined and not shipped.

Export documentation — including commercial invoice, packing list, and certificate of origin — is prepared for every international shipment. Air freight via DHL Express or FedEx International Priority delivers to major industrial hubs in Southeast Asia, the Middle East, Europe, and North America within 3–7 business days from Xiamen Gaoqi International Airport. For urgent plant turnaround requirements, same-day dispatch is available for orders confirmed before 14:00 CST. Sea freight consolidation is available for multi-item MRO orders where lead time permits.

All units are shipped in anti-static, moisture-barrier packaging with desiccant inserts. Probe tip protection caps are installed to prevent coil damage during transit. A 12-month warranty covers manufacturing defects under normal operating conditions from the date of shipment.

Contact Information

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