Bently Nevada 330104-13-20-50-02-00 Proximity Probe – 3300 XL Series

Bently Nevada 330104-13-20-50-02-00 — 8mm Eddy Current Proximity Probe for Critical Rotating Machinery Protection

The Bently Nevada 330104-13-20-50-02-00 is an 8mm eddy current proximity probe belonging to the 3300 XL Series platform — a measurement system that has defined the benchmark for non-contact shaft displacement sensing in turbomachinery protection for over three decades. This specific part number encodes a complete, factory-matched probe assembly: 13-inch (330 mm) armored probe cable, 20-foot (6.1 m) extension cable, 50-foot (15.2 m) proximitor cable, and standard industrial connector termination (suffix -02-00). Each segment of the cable system is impedance-matched at the factory to preserve the 200 mV/mil (7.87 V/mm) scale factor across the full measurement chain — a critical requirement that distinguishes OEM assemblies from field-assembled alternatives.

In a machinery protection architecture governed by API 670, the proximity probe is the primary sensing element. Its output fidelity directly determines the accuracy of radial vibration, axial position, and differential expansion measurements fed into the protection relay logic. The 330104-13-20-50-02-00 is specified by rotating equipment engineers in steam turbines, gas turbines, centrifugal compressors, and large motor-driven pumps where shaft displacement data must be continuous, drift-free, and traceable to a calibrated reference.

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Technical Parameters

Hardware Logical Analysis

The 330104-13-20-50-02-00 operates on the principle of electromagnetic induction impedance modulation. The probe coil, driven by the 3300 XL NSv proximitor oscillator at approximately 1–2 MHz, generates a focused electromagnetic field at the probe tip. When a conductive target (shaft) enters this field, eddy currents are induced on the target surface, loading the coil and reducing its effective inductance. The proximitor demodulates this impedance change into a DC voltage output linearly proportional to the probe-to-target gap.

Impedance-Matched Cable System: The -13-20-50 cable length designation is not arbitrary. The total system impedance — probe coil inductance, extension cable capacitance, and proximitor input impedance — must be matched to within tight tolerances to maintain the 200 mV/mil scale factor. Bently Nevada factory-matches each assembly and encodes the cable lengths in the part number suffix. Field substitution of cable lengths without recalibration introduces systematic measurement error that cannot be corrected by zero or span adjustment alone.

EMC Design Architecture: The armored cable construction provides a continuous Faraday shield from probe body to proximitor input. The shield is grounded at the proximitor end only (single-point grounding) to prevent ground loop currents from injecting common-mode noise into the measurement signal. In high-EMI environments — near variable-frequency drives, large transformers, or bus bars — this single-point shield topology maintains signal integrity without requiring additional filtering that would attenuate high-frequency vibration components.

Thermal Drift Compensation: The probe coil is wound with a temperature-compensated wire alloy selected to minimize inductance variation across the −35°C to +177°C operating range. The proximitor oscillator circuit includes a complementary temperature coefficient network that tracks probe coil drift, maintaining scale factor accuracy to within ±0.5% across the full thermal envelope. This is particularly relevant in steam turbine applications where bearing housing temperatures can vary by 80–100°C between cold startup and full-load steady state.

Eddy Current Depth of Penetration: At 1–2 MHz excitation frequency, the skin depth in AISI 4140 steel is approximately 0.08–0.11 mm. This shallow penetration depth means the probe responds exclusively to surface displacement — not bulk material movement — providing a true measure of shaft journal position relative to the bearing centerline. For non-standard target materials (austenitic stainless steel, titanium alloys, Inconel), the skin depth and permeability differ, requiring a material-specific calibration curve to maintain measurement accuracy.

System Integration Benefits

• Direct API 670 Compliance: The 330104-13-20-50-02-00 meets all API 670 5th Edition requirements for proximity probe systems, including scale factor tolerance, frequency response, and temperature range — eliminating the need for additional compliance documentation in new installations or replacement projects.
• Native 3300 XL NSv Compatibility: Plug-and-play integration with the 330180-Series proximitor. No field calibration required when replacing a like-for-like assembly; the factory-matched cable system preserves the original calibration state.
• System 1 Software Integration: Output feeds directly into Bently Nevada System 1 condition monitoring software via the 3500 Series rack monitor, enabling full waveform capture, orbit plot generation, and trend analysis without signal conditioning adapters.
• Deterministic DC-to-10 kHz Response: The flat frequency response from DC to 10,000 Hz captures both quasi-static shaft position (slow-roll vectors at <1 Hz) and high-frequency vibration events (blade-pass frequencies in multi-stage compressors), within a single measurement channel — eliminating the need for separate position and vibration transducers.
• Dual-Function Measurement: A single 330104-13-20-50-02-00 installation simultaneously provides radial vibration amplitude (AC component) and average shaft centerline position (DC component), reducing transducer count and associated wiring complexity in bearing housings with limited access ports.
• Hazardous Area Deployment: With an appropriate Zener barrier or galvanic isolator, the probe assembly is suitable for Zone 1/Division 1 classified areas. FM and CSA intrinsically safe certifications are available on specific variants, supporting installation in petrochemical and LNG facilities without additional enclosure requirements.
• Diagnostic Transparency via Gap Voltage Monitoring: The −2 to −22 VDC output range provides a continuous, observable gap voltage that maintenance engineers can trend over time. A gradual shift in DC gap voltage — independent of vibration amplitude — indicates bearing wear, thermal growth, or probe fouling, enabling condition-based maintenance decisions before a protection trip occurs.
• Reduced Maintenance Burden: Non-contact sensing eliminates all mechanical wear mechanisms. There are no moving parts, no contact fatigue, and no lubrication requirements. Mean time between maintenance actions is determined by the process environment (fouling, corrosion) rather than by the transducer’s mechanical life cycle.

Quality Assurance & Global Logistics

Every Bently Nevada 330104-13-20-50-02-00 unit stocked at siemensplc.com is sourced through verified supply channels with full OEM traceability. Incoming units undergo a structured inspection protocol: visual examination of probe body, cable jacket, and connector terminations; dimensional verification of probe tip geometry; functional continuity check of the coil circuit; and serial number cross-reference against Bently Nevada / Baker Hughes OEM records. Units that do not pass all inspection criteria are quarantined and returned — no exceptions.

Original OEM packaging is preserved throughout storage and transit. Anti-static inner packaging and moisture-barrier outer packaging protect the probe coil and cable assembly from electrostatic discharge and humidity-induced corrosion during long-distance shipment. Inventory is stored in a climate-controlled warehouse in Xiamen, China, with temperature and humidity logging to ensure shelf-life compliance for sensitive electronic components.

Shipments are dispatched via DHL Express, FedEx International Priority, and UPS Worldwide Express from Xiamen, with typical transit times of 3–5 business days to Europe, North America, the Middle East, and Southeast Asia. EXW, FOB Xiamen, and CIF destination Incoterms are available to accommodate different procurement frameworks. For shutdown or turnaround emergencies, same-day dispatch is available on confirmed in-stock units. A 12-month warranty covers all units against manufacturing defects and premature failure under normal operating conditions.

Contact Information

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