Bently Nevada 330709-000-230-10-02-00 Proximity Probe – 3300 XL 8mm

Bently Nevada 330709-000-230-10-02-00 — 8mm Eddy Current Proximity Probe in the 3300 XL Transducer System

The 330709-000-230-10-02-00 is a metric-configuration, 8mm eddy current proximity probe within Bently Nevada’s 3300 XL Proximity Transducer System. Its primary function in a rotating machinery protection loop is to deliver a continuous, non-contact DC voltage signal proportional to the instantaneous gap between the probe tip and the conductive target surface — typically a precision-ground journal or thrust collar on a rotating shaft. This signal feeds directly into a Bently Nevada 3500 Series rack or equivalent monitoring system, where it is processed for radial vibration amplitude, shaft centerline position, and axial displacement — three of the four fundamental parameters mandated by API 670 for turbomachinery protection.

The probe operates on the eddy current induction principle: a high-frequency oscillator (typically 1.0 MHz nominal) within the paired proximitor drives an alternating magnetic field through the probe coil. When a conductive target enters this field, eddy currents are induced on the target surface, loading the oscillator circuit and reducing its output amplitude. The proximitor demodulates this amplitude change into a linear DC voltage output, calibrated at 7.87 V/mm (200 mV/mil) sensitivity across a nominal linear range of 0 to 2.0 mm. The 330709-000-230-10-02-00 integral cable length of 2.3 m is factory-matched to the system’s total cable length requirement — a critical parameter because the combined probe-plus-extension cable length determines the LC resonant characteristics of the transducer circuit and must match the proximitor’s calibration.

In a typical turbomachinery protection architecture, two probes are mounted at 90° X-Y orientation at each radial bearing plane, with a third probe at the thrust bearing for axial position. The 330709-000-230-10-02-00 is dimensioned for installations requiring metric thread housing (M10×1.0 standard) and metric cable assemblies, making it the correct selection for European, Asian, and international projects where metric engineering standards govern the mechanical interface.

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

Technical Parameters

Hardware Logical Analysis

The 330709-000-230-10-02-00 probe coil is wound on a ferrite core and encapsulated in a thermoplastic housing rated for continuous immersion in turbine lube oil environments. The coil geometry is precision-controlled to maintain consistent inductance across the production batch, which directly governs the slope of the output transfer function. Batch-to-batch inductance variation is held within ±2% to ensure interchangeability without field recalibration when the probe is replaced within the same system configuration.

The integral 2.3 m coaxial cable is a critical electrical element, not merely a mechanical connector. Its distributed capacitance and inductance form part of the resonant tank circuit that the proximitor oscillator drives. The cable is factory-terminated and impedance-matched to the probe coil; field-splicing or substitution with non-OEM cable will shift the resonant frequency and degrade linearity. The cable shield is grounded at the proximitor end only (single-point grounding) to prevent ground loop currents from introducing noise into the measurement signal — a standard EMC practice for high-impedance analog instrumentation circuits.

The probe housing incorporates a stainless steel armored outer jacket over the cable exit point, providing mechanical protection against abrasion in bearing housing environments where oil mist, vibration, and thermal cycling are continuous stressors. The MIL-C-5015 connector at the cable terminus provides a positive-locking, environmentally sealed interface rated for repeated mating cycles without degradation of contact resistance — a specification requirement for machinery protection instrumentation where connector integrity directly affects measurement availability.

EMC performance is achieved through the combination of coaxial cable shielding, single-point grounding, and the inherently narrow-band nature of the eddy current measurement circuit. The 1.0 MHz carrier frequency is well above the frequency range of most industrial electromagnetic interference sources (VFD switching harmonics, motor commutation noise), and the proximitor’s demodulation circuit acts as a low-pass filter that rejects out-of-band interference before the DC output signal is generated.

System Integration Benefits

• API 670 Compliance Out of the Box: The 330709-000-230-10-02-00 is designed and documented to meet API 670 Fourth Edition requirements for proximity transducer systems, eliminating the need for third-party compliance verification in EPC and owner-operator procurement workflows.
• Deterministic Transfer Function: Factory calibration at 7.87 V/mm provides a known, repeatable output slope that allows the 3500 Series monitor to apply direct engineering-unit scaling without field calibration — reducing commissioning time and eliminating technician-introduced calibration error.
• Matched System Architecture: The 2.3 m integral cable is engineered as part of the total cable length budget for the 3300 XL system. When paired with the correct extension cable and proximitor, the system operates within its specified linearity envelope without adjustment.
• Diagnostic Transparency: The continuous DC output signal allows the monitoring system to detect not only vibration events but also probe gap drift (shaft centerline migration), slow-roll runout, and electrical noise floor changes — providing early warning of both mechanical and instrumentation degradation.
• Zero Mechanical Wear: Non-contact sensing eliminates the wear mechanisms that limit the service life of contact-type sensors. Under normal operating conditions with correct installation gap (typically 1.0 mm nominal), probe service life is indefinite and limited only by thermal and chemical degradation of the cable and housing materials.
• Metric Thread Universality: The M10×1.0 metric thread housing is compatible with the majority of international turbomachinery OEM probe boss designs, eliminating the need for thread adapters that introduce mechanical compliance and potential misalignment into the probe mounting.
• Broad Temperature Envelope: The –35°C to +177°C probe body rating covers the full range of industrial turbomachinery bearing housing temperatures, from cold-climate startup conditions to hot-section gas turbine bearing environments, without requiring probe derating or special installation provisions.
• Ecosystem Interoperability: The 330709-000-230-10-02-00 is interoperable with the full Bently Nevada 3300 XL ecosystem — 330130-series extension cables, 330180-series proximitors, and 3500-series monitoring racks — allowing incremental system upgrades without replacing the entire transducer chain.

Quality Assurance & Global Logistics

Every 330709-000-230-10-02-00 unit supplied by siemensplc.com is sourced as genuine Bently Nevada (Baker Hughes) OEM hardware. Units are procured through verified supply channels with full part number traceability. Prior to shipment from our Xiamen, China facility, each probe undergoes visual inspection for housing integrity, cable sheath condition, connector contact quality, and part number label verification against Bently Nevada product documentation.

Packaging follows anti-static and humidity-control protocols: probes are individually wrapped in anti-static foam, sealed with desiccant in moisture-barrier bags, and packed in rigid outer cartons rated for international air and sea freight. Export documentation — including commercial invoice, packing list, and certificate of conformance — is prepared in compliance with Chinese customs export regulations and destination-country import requirements. Shipment from Xiamen typically reaches major industrial hubs in Southeast Asia within 3–5 business days, Europe within 5–8 business days, and the Americas within 5–10 business days via DHL, FedEx, or UPS express freight. A 12-month warranty covers manufacturing defects 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.