Bently Nevada 330101-00-36-10-02-05 Proximity Probe – 3300 XL Series

Bently Nevada 330101-00-36-10-02-05: Eddy-Current Proximity Probe for Rotating Machinery Condition Monitoring

The Bently Nevada 330101-00-36-10-02-05 is a passive eddy-current proximity probe belonging to the 3300 XL Proximity Transducer System. It operates on the principle of electromagnetic induction: a high-frequency oscillating magnetic field generated at the probe tip induces eddy currents in any electrically conductive target surface within its measurement range. The resulting energy loss in the oscillator circuit is converted by the paired Proximitor® sensor into a DC voltage output proportional to the physical gap between probe tip and target. This non-contact measurement principle eliminates mechanical wear, making the 330101-00-36-10-02-05 suitable for continuous, uninterrupted deployment on critical rotating assets where shaft access is mechanically constrained.

The part number encodes the full physical configuration: 330101 identifies the probe family within the 3300 XL series; 00 denotes the standard armored cable jacket; 36 specifies a 36-inch (914 mm) integral cable length; 10 indicates the 10-32 UNF threaded housing; 02 defines the 2-pin MIL-spec connector; and 05 designates the 5 mm tip diameter. Each segment is a functional parameter, not a cosmetic label — substituting any digit changes the electrical or mechanical behavior of the transducer system and invalidates factory calibration.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

The 330101-00-36-10-02-05 probe functions as the passive front-end of a three-component transducer chain: probe → extension cable → Proximitor® sensor. Understanding the hardware logic of each element is essential for correct system deployment.

Oscillator Loading and Gap-Voltage Linearity: The Proximitor® sensor houses the LC oscillator circuit. The probe tip coil acts as the inductive element of this resonant tank. As the conductive target approaches the probe tip, eddy currents increase, loading the oscillator and reducing its amplitude. The Proximitor® demodulates this amplitude change into a DC output. The 5 mm tip diameter of the 330101-00-36-10-02-05 defines the coil geometry and therefore the sensitivity coefficient (200 mV/mil). A larger tip diameter would extend the linear range but reduce spatial resolution; the 5 mm format is optimized for shaft diameters between 50 mm and 150 mm, which covers the majority of industrial turbomachinery applications.

Cable Impedance Matching: The 36-inch integral cable is factory-matched to the probe coil. The total system cable length — integral cable plus extension cable — must equal either 5 m or 9 m for the Proximitor® to maintain its calibrated sensitivity. Deviating from these lengths alters the distributed capacitance of the coaxial cable, shifting the resonant frequency of the oscillator and introducing a gain error that cannot be corrected by field adjustment. This is why the cable length code (36 in this part number) is a non-interchangeable parameter.

EMC Design: The armored cable jacket (code 00) provides a continuous metallic shield from probe body to connector, suppressing radiated interference from adjacent high-voltage cables, variable-frequency drives, and bus bars common in turbine control enclosures. The shield is grounded at the Proximitor® end only (single-point grounding) to prevent ground loop currents from introducing noise into the DC output signal. This architecture maintains signal integrity in environments where common-mode noise can exceed 50 V peak-to-peak.

Thermal Stability: The 316 stainless steel housing has a low coefficient of thermal expansion relative to the probe coil former material. Over the operating range of –35°C to +121°C, dimensional change in the probe tip geometry remains within the tolerance band that preserves the factory sensitivity calibration. This is particularly relevant in steam turbine applications where bearing housing temperatures can cycle significantly during startup and shutdown sequences.

System Integration Benefits

• Deterministic gap-voltage output: The 200 mV/mil sensitivity is factory-calibrated against AISI 4140 steel targets, providing a repeatable, traceable output that requires no field calibration when replacing a like-for-like unit in an existing 3300 XL installation.
• Direct API 670 compliance: The probe meets the transducer performance requirements of API 670 5th Edition, allowing it to be used in machinery protection systems without additional qualification testing, reducing engineering review time during plant commissioning.
• Plug-compatible with 3500 Series racks: The 330101-00-36-10-02-05 interfaces directly with the Bently Nevada 3500/40M Proximitor®/Seismic Monitor module. No signal conditioning adapters or range adjustments are required; the monitor card reads the Proximitor® DC output natively.
• Diagnostic transparency via OK relay: When paired with the 330180/330185 Proximitor®, the system provides a hardware OK relay output that de-energizes if the probe gap moves outside the linear measurement range or if the coaxial cable is open or shorted. This allows the DCS or safety system to distinguish between a genuine vibration alarm and a transducer fault, reducing nuisance trips.
• Non-contact measurement eliminates wear-induced drift: Unlike contact-type displacement sensors, the eddy-current probe has no moving parts and no physical contact with the rotating shaft. Long-term zero drift is governed by coil geometry stability rather than mechanical wear, resulting in calibration intervals measured in years rather than months.
• High-frequency response for sub-synchronous detection: The –3 dB bandwidth of DC to 10,000 Hz allows the system to capture sub-synchronous instability events (oil whirl, oil whip) and high-frequency blade-pass frequencies in addition to 1× and 2× running speed components, providing a complete vibration signature without additional sensors.
• Redundancy-ready architecture: Two probes mounted 90° apart on the same bearing journal (X-Y configuration) provide full orbital analysis capability. The 3500/40M module supports dual-probe inputs per channel, enabling redundant measurement without additional rack slots.
• Minimal installation footprint: The 10-32 UNF thread and 5 mm tip diameter allow installation in bearing housings with limited radial clearance. The 36-inch integral cable provides sufficient routing length to reach the nearest junction box in most standard turbine pedestal configurations without requiring an extension cable splice at the probe end.

Quality Assurance & Global Logistics

Every Bently Nevada 330101-00-36-10-02-05 unit supplied by siemensplc.com is sourced through verified procurement channels and subjected to a structured pre-shipment inspection protocol. Visual examination covers connector pin condition, cable sheath integrity, probe tip surface finish, and label legibility. Functional verification is performed against a calibrated gap-voltage reference fixture to confirm that the probe’s sensitivity falls within the factory-specified tolerance of ±1% of 200 mV/mil across the full linear range. Serial numbers are recorded at the time of inspection and included in the shipment documentation.

Shipments originate from our warehouse in Xiamen, China — a major international logistics hub with direct access to DHL Express, FedEx International Priority, and UPS Worldwide Expedited services. Standard in-stock orders are dispatched within 1–3 business days of payment confirmation. Export documentation — commercial invoice, packing list, certificate of origin, and HS code classification (HS 9031.80) — is prepared for every international shipment. For project orders requiring multiple units or matched transducer sets (probe + extension cable + Proximitor®), consolidated shipment with a single customs entry is available on request. 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
© 2026 siemensplc.com. All rights reserved.