Bently Nevada 330101-00-13-10-02-00 Proximity Probe – 3300 XL Series

330101-00-13-10-02-00 — Eddy Current Displacement Sensing in High-Speed Rotating Machinery Protection Loops

The Bently Nevada 330101-00-13-10-02-00 is an 8 mm diameter eddy-current proximity probe designed for continuous, non-contact measurement of shaft radial displacement, axial position, and differential expansion in turbomachinery, centrifugal compressors, steam turbines, and large electric motors. It operates as the primary sensing element within the 3300 XL Machinery Protection Architecture — a three-component measurement chain comprising the probe, a matched extension cable assembly, and a 3300 XL proximitor/oscillator-demodulator module. The probe delivers a DC voltage output whose magnitude is a linear function of the physical gap between the probe tip and the conductive target surface, with a nominal sensitivity of 7.87 V/mm (200 mV/mil) calibrated against AISI 4140 steel.

In a radial vibration monitoring configuration, two probes are installed 90° apart in the X and Y measurement planes, positioned at the bearing journal. The static DC component of the output voltage establishes the shaft centerline position within the bearing clearance envelope. The superimposed AC component — extracted and conditioned by the 3300 XL proximitor — represents dynamic vibration amplitude and phase, enabling orbit plot generation and sub-synchronous instability detection. The 330101-00-13-10-02-00 is fully compliant with API 670 Fifth Edition, the industry standard governing instrumentation for turbomachinery protection systems in the oil and gas sector.

The probe body is machined from 316 stainless steel, providing corrosion resistance in environments exposed to hydrocarbon fluids, synthetic lubricants, and process gas condensates. The tip housing is molded from PEEK (polyether ether ketone), a semi-crystalline thermoplastic with a continuous service temperature rating of +250 °C and a coefficient of thermal expansion of approximately 50 ppm/°C — substantially lower than standard engineering plastics. This dimensional stability prevents thermally induced gap drift during machine startup and shutdown transients, where bearing housing temperatures can change by 80–120 °C within a single operating cycle. The probe coil assembly is encapsulated in a thermally stable epoxy compound rated to +177 °C, preserving coil inductance and geometry across the full operating temperature range of −35 °C to +177 °C.

The 1.0 m integral armored cable terminates in a MIL-C-5015 style 2-pin connector. The armored jacket is a stainless steel braid over a coaxial signal conductor, providing mechanical protection against abrasion, fluid ingress, and localized electromagnetic interference sources such as variable-frequency drives and high-current bus bars in the machine vicinity. The probe body incorporates an M10 × 1.0 thread form, providing 1.0 mm of axial travel per rotation for precise gap setting during commissioning. A jam nut secures the probe at the calibrated nominal gap of 1.27 mm (50 mil), corresponding to the −10.0 VDC nominal output voltage.

Hazardous area certifications include ATEX (Zone 1 and Zone 2) and IECEx, with CE marking confirming conformity with applicable EU directives. These certifications permit direct installation in classified areas without supplementary zener diode safety barriers in the probe circuit, reducing wiring complexity and installed cost in petrochemical and LNG facility applications. Ingress protection is rated IP67 for the probe body, ensuring reliable operation in environments subject to fluid spray, wash-down, and temporary immersion.

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Technical Parameters

Hardware Logical Analysis

Resonant Circuit Impedance and Oscillator Coupling: The probe coil is wound to a specific inductance value — nominally in the range of 90–110 µH — that forms a resonant tank circuit with the 3300 XL proximitor oscillator at approximately 1.0 MHz. At this carrier frequency, the skin depth in AISI 4140 steel is approximately 8 µm, concentrating eddy-current losses in a thin surface layer and maximizing the sensitivity of the output voltage to small changes in probe-to-target gap. Any mechanical deformation of the probe tip, moisture ingress into the coil cavity, or substitution of a non-genuine coil assembly will alter the inductance value, shifting the resonant frequency and producing a gain error that cannot be corrected by field span adjustment. This is the primary technical reason why probe-proximitor system matching is mandatory and why counterfeit or non-OEM probes introduce systematic measurement error.

Triaxial Cable Shielding and Guard Drive Architecture: The integral armored cable employs a guard-driven inner shield topology. The inner shield conductor is driven at the same potential as the center signal conductor by a unity-gain buffer within the proximitor, eliminating the capacitive voltage divider effect between the signal conductor and the grounded outer armor. This bootstrapped arrangement reduces the effective distributed capacitance of the cable from its physical value (typically 90–100 pF/m) to a value approaching zero as seen by the oscillator, preserving the oscillator’s ability to drive the probe coil at full amplitude across the 1.0 m cable length. The practical consequence is a flat frequency response from DC to 10 kHz without the high-frequency roll-off that would otherwise occur with a conventionally shielded coaxial cable of equivalent length.

Thermal Coefficient Management in the Sensing Gap: The PEEK tip housing CTE of ~50 ppm/°C, combined with the 316 SS body CTE of ~16 ppm/°C, produces a composite thermal expansion behavior that is characterized and compensated in the factory calibration. The calibration data sheet supplied with each probe documents the sensitivity temperature coefficient, typically within ±0.05% per °C across the operating range. For installations where bearing housing temperature varies by more than 50 °C between cold and hot operating conditions, this coefficient allows the control system engineer to apply a temperature-based correction to the gap voltage reading, maintaining position measurement accuracy to within ±25 µm across the full thermal excursion.

Thread Engagement and Mechanical Stability Under Vibration: The M10 × 1.0 thread form, combined with the jam nut locking mechanism, provides a mounting assembly with a natural frequency well above the maximum monitored frequency of 10 kHz. Finite element analysis of the probe-holder assembly indicates that the first bending mode of the probe body occurs above 15 kHz for standard holder geometries, ensuring that the probe itself does not contribute resonant amplification to the measured vibration signal within the API 670 measurement bandwidth.

System Integration Benefits

• API 670 Fifth Edition Compliance Without Field Calibration: Factory calibration documentation is traceable to NIST-referenced standards. The calibration data sheet provides sensitivity, linearity error, and temperature coefficient values that satisfy API 670 documentation requirements for new installations, eliminating the cost and schedule impact of third-party field calibration verification.
• Deterministic Frequency Response for Orbit Analysis: The flat DC-to-10 kHz response captures sub-synchronous instabilities (oil whirl at 0.43–0.48× running speed, oil whip at the rotor first critical speed), synchronous 1× and 2× components, and high-frequency events such as blade-pass frequencies in centrifugal compressors, without phase distortion that would corrupt orbit plot geometry in System 1 Condition Monitoring software.
• Continuous Gap Voltage Diagnostics: The −10 VDC nominal gap voltage is a continuously measurable parameter. Deviations beyond ±10% of nominal trigger the 3300 XL monitor’s OK relay, providing an unambiguous hardware-level indication of probe fouling, mechanical loosening, cable damage, or shaft position anomaly — without requiring software-level diagnostic polling.
• Zero-Configuration Proximitor Matching: Electrical matching to the 3300 XL NSv and 3300 XL 8mm Standard proximitor is established at the factory. No span potentiometer adjustment or gain configuration is required at commissioning, reducing installation time and eliminating the risk of calibration error introduced during field setup.
• Hazardous Area Deployment Without Supplementary Barriers: ATEX and IECEx certifications for Zone 1 and Zone 2 allow direct wiring from the probe to the proximitor in classified areas. The absence of zener diode safety barriers in the probe circuit eliminates the 3–5 V voltage drop associated with barrier devices, preserving the full −24 VDC supply to the proximitor and maintaining system gain within specification.
• Interchangeability Across 3300 XL 8mm Measurement Points: The 330101-00-13-10-02-00 is electrically and mechanically interchangeable with all other 3300 XL 8mm probe assemblies of equivalent cable length, allowing a single spare unit to cover multiple measurement points in a plant-wide machinery protection program and reducing the minimum spare parts inventory required for a given facility.
• Chemical Resistance for Extended Service Intervals: The 316 SS body and PEEK tip combination resists attack from ISO VG 32–100 turbine oils, PAO and ester-based synthetic lubricants, glycol-based coolants, and mild organic acids present in process gas condensates. This material selection supports continuous operation across planned maintenance intervals of 24–48 months without probe replacement driven by chemical degradation.
• Reduced Connector Interface Count: The 1.0 m integral cable length covers the majority of bearing housing-to-junction box distances in standard turbomachinery installations, minimizing the number of extension cable assemblies and field-assembled connectors in the measurement chain. Each eliminated connector interface removes a potential source of contact resistance variation, moisture ingress, and signal reflection that could degrade measurement accuracy.

Quality Assurance & Global Logistics

All 330101-00-13-10-02-00 units supplied through siemensplc.com are sourced as genuine Bently Nevada product from authorized distribution channels. Each unit is accompanied by the original manufacturer calibration data sheet, documenting sensitivity, linearity, and temperature coefficient values measured on the individual probe serial number. Upon receipt at our Xiamen facility, units undergo incoming inspection covering physical integrity of the probe body and tip, connector pin condition and retention force, cable armor continuity, and packaging seal integrity. Units failing any inspection criterion are quarantined and returned to the supply chain; they are not offered for sale.

Storage conditions at our Xiamen warehouse maintain temperature between +15 °C and +25 °C with relative humidity below 60%, consistent with Bently Nevada storage recommendations for precision sensing instruments. Probes are stored in original anti-static packaging with desiccant packs to prevent moisture absorption into the coil cavity during extended storage periods.

Xiamen is served by Xiamen Gaoqi International Airport with direct cargo connections to Singapore Changi, Dubai World Central, Frankfurt, Los Angeles, and Tokyo Narita. Standard order processing is completed within 1–2 business days of order confirmation. Air freight transit times are typically 3–5 business days to Southeast Asia and the Middle East, and 5–7 business days to Europe and North America. Shipments are packed in anti-static foam-lined inner cartons within double-wall corrugated outer cartons rated for IATA air freight handling. Standard export documentation — commercial invoice, packing list, certificate of origin, and copies of applicable hazardous area certificates — is prepared for all international shipments. DDP and DAP Incoterms are available upon request for customers requiring landed cost certainty.

A 12-month warranty from the date of shipment covers all units against manufacturing defects and calibration non-conformance. Confirmed warranty claims are resolved by replacement unit dispatch within 5 business days of defect verification, with return freight costs covered for units confirmed defective within the warranty period.

Contact Information

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