Bently Nevada 330101-36-80-10-02-05 Proximity Transducer – 3300 XL Series

Bently Nevada 330101-36-80-10-02-05 — Eddy-Current Proximity Transducer for Continuous Shaft Monitoring

The Bently Nevada 330101-36-80-10-02-05 is an 8 mm eddy-current proximity probe belonging to the 3300 XL Proximity Transducer System. Its primary function within a machinery protection loop is to convert the physical gap between the probe tip and a conductive target surface into a proportional DC voltage signal, enabling continuous, non-contact measurement of radial shaft vibration, axial position, and eccentricity on rotating equipment. The transducer operates as one leg of a three-component measurement chain — probe, extension cable, and Proximitor driver — each factory-matched to maintain system-level linearity within ±1% across the full linear range.

In a typical turbine or compressor protection architecture, the 330101-36-80-10-02-05 mounts radially in a bearing housing bracket, with its tip positioned at a nominal gap of 50 mil (1.27 mm) from the shaft journal. As the shaft orbits under load, the varying gap modulates the eddy-current field generated by the probe’s internal oscillator coil. The Proximitor driver demodulates this signal and outputs a DC voltage at −200 mV/mil sensitivity, which the connected monitor — such as a Bently Nevada 3500/42 or 3300/16 — samples at rates sufficient to resolve vibration frequencies up to several kilohertz. This architecture underpins API 670-compliant machinery protection systems across oil and gas, power generation, petrochemical, and heavy industrial sectors.

The part number suffix encodes the physical configuration: 36 denotes a 36-inch (914 mm) integral armored cable from probe body to connector; 80 specifies an 80-inch (2,032 mm) extension cable; 10 indicates armored cable construction; 02 identifies the 2-pin MIL-C-5015 connector; and 05 designates the standard option package. This configuration is among the most widely deployed variants in the 3300 XL family, making it a direct fit for the majority of legacy and current-generation Bently Nevada monitor installations.

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Technical Parameters

Hardware Logical Analysis

The 330101-36-80-10-02-05 probe body houses a precision-wound oscillator coil embedded in a ceramic-filled epoxy matrix, which provides both electrical isolation and mechanical rigidity under continuous vibration loading. The coil is driven by a high-frequency oscillator circuit within the paired Proximitor driver, typically operating at 1.0 MHz carrier frequency. When the probe tip approaches a conductive target, eddy currents induced in the target surface load the oscillator circuit, reducing its amplitude in a manner that is monotonically related to the gap distance across the calibrated linear range.

The armored integral cable — designated by the -10- suffix — uses a stainless-steel braid over a PTFE-insulated coaxial conductor. This construction provides three distinct engineering benefits: it maintains the characteristic impedance of the coaxial transmission line to prevent signal reflection at the probe-to-extension junction; it shields the low-level oscillator signal from external electromagnetic interference (EMI) generated by motor drives, switchgear, and high-current bus bars common in industrial environments; and it provides mechanical protection against abrasion, hydraulic fluid exposure, and incidental impact in bearing housing installations.

The MIL-C-5015 connector at the probe-to-extension interface is a bayonet-locking, environmentally sealed design rated to IP67. Its gold-plated contacts maintain contact resistance below 5 mΩ over the service life, preventing the connector junction from introducing measurable impedance discontinuities that would degrade signal fidelity. The extension cable maintains the same coaxial geometry and characteristic impedance as the integral cable, ensuring the Proximitor driver sees a consistent electrical load regardless of the combined cable length.

From an EMC standpoint, the 3300 XL system’s differential measurement architecture — where the Proximitor driver references the probe signal against an internal precision reference — provides common-mode rejection of noise coupled onto the cable shield. This is particularly relevant in installations where the probe cable runs parallel to power conductors in cable trays, a configuration that would otherwise introduce 50/60 Hz interference into the vibration signal chain. The result is a signal-to-noise ratio sufficient to resolve vibration amplitudes below 1 mil peak-to-peak in the presence of industrial EMI environments.

System Integration Benefits

• Direct API 670 compliance: The 330101-36-80-10-02-05 is validated as a matched transducer set for use in machinery protection systems built to API 670 (5th Edition), eliminating the need for additional system-level qualification when replacing in-kind on existing installations.
• Deterministic signal latency: The eddy-current measurement principle introduces no mechanical hysteresis or thermal drift in the signal path. The probe output tracks shaft position changes with a group delay determined solely by the Proximitor driver’s demodulation filter, typically less than 100 µs, supporting high-confidence alarm response times in the connected monitor.
• Matched-set calibration traceability: Each probe, extension cable, and Proximitor driver is factory-calibrated as a matched set, with sensitivity and linearity verified against NIST-traceable standards. This eliminates inter-component calibration uncertainty and supports audit requirements in regulated industries.
• Non-contact measurement eliminates wear: Unlike contact-type displacement sensors, the eddy-current probe imposes no mechanical load on the shaft and has no wear mechanism. Mean time between replacement is governed by environmental degradation of the cable and connector rather than sensor element fatigue, supporting multi-year maintenance intervals in clean installations.
• Broadband frequency response: The DC-to-10 kHz (−3 dB) frequency response captures both low-frequency shaft position changes (eccentricity, thermal growth) and high-frequency vibration components (blade-pass frequencies, gear mesh frequencies) within a single measurement channel, reducing the number of transducers required per measurement point.
• Compatibility with System 1 software: The analog output of the 3300 XL transducer chain is directly compatible with Bently Nevada System 1 condition monitoring software via the 3500 series I/O modules, enabling trend analysis, alarm management, and predictive maintenance workflows without signal conditioning adapters.
• Hazardous area deployment: ATEX certification (consult datasheet for specific zone and category) permits installation in Zone 1 and Zone 2 classified areas, covering the majority of oil and gas processing environments where rotating machinery protection is required.
• Standardized spare parts management: The 330101 series is the most widely deployed 8 mm proximity probe family in the installed base of Bently Nevada systems globally. Stocking the 330101-36-80-10-02-05 as a standard spare covers the majority of radial vibration measurement points on 3300 and 3500 series monitor installations, simplifying spare parts inventory management.

Quality Assurance & Global Logistics

Every unit of the Bently Nevada 330101-36-80-10-02-05 supplied by siemensplc.com is sourced as genuine OEM stock from authorized distribution channels and verified surplus inventory with full traceability documentation. Prior to dispatch, each unit undergoes a functional verification check: probe tip impedance is measured to confirm the oscillator coil is intact, connector contact resistance is verified below 5 mΩ, and cable continuity and shield integrity are confirmed end-to-end. Units with original Bently Nevada / Baker Hughes packaging and certificates of conformance are available on request.

Logistics operations are based in Xiamen, China, a major international port city with direct air freight connections to Singapore, Dubai, Frankfurt, Los Angeles, and Tokyo. Standard orders ship within 1–3 business days via DHL Express, FedEx International Priority, or UPS Worldwide Expedited, with typical transit times of 3–5 business days to most destinations in Southeast Asia, the Middle East, Europe, and North America. For time-critical plant shutdowns or emergency replacements, same-day dispatch is available for in-stock units when orders are confirmed before 14:00 CST. Export documentation — including commercial invoice, packing list, certificate of origin, and ECCN/EAR classification — is prepared as standard for all international shipments to support customs clearance without delay.

A 12-month warranty against manufacturing defects is provided on all units. Warranty claims are processed with a target response time of 48 hours, and replacement units are dispatched from Xiamen stock to minimize downtime impact on the customer’s operation.

Contact Information

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