Bently Nevada 330103-00-15-10-02-CN Proximity Probe – 3300 XL Series

Bently Nevada 330103-00-15-10-02-CN: 8mm Eddy-Current Proximity Probe for Continuous Shaft Monitoring in Turbomachinery Protection Systems

The 330103-00-15-10-02-CN is a field-proven 8mm eddy-current proximity probe manufactured by Bently Nevada (Baker Hughes) for deployment within the 3300 XL Proximity Transducer System. Its primary function in a machinery protection control loop is non-contact measurement of radial shaft vibration, axial shaft position, and differential thermal expansion — three parameters that collectively define the mechanical health state of rotating equipment operating under continuous load.

Unlike contact-type displacement sensors, the eddy-current probe generates a high-frequency oscillating electromagnetic field (typically 1.0 MHz for 8mm probes) from its tip coil. When a conductive target shaft enters the sensing field, eddy currents are induced on the shaft surface, loading the probe’s LC tank circuit and producing a measurable impedance shift. The paired Proximitor oscillator-demodulator converts this impedance change into a DC voltage output, scaled at −200 mV/mil (−7.87 V/mm) across the linear measurement range. This analog signal is then fed directly into the 3500 Series Machinery Protection System rack for threshold comparison, alarm generation, and trip relay actuation — all within deterministic response times governed by the rack’s I/O scan cycle.

The -00-15-10-02-CN suffix encodes the complete mechanical configuration: 00 = standard probe body, 15 = 15-inch (381 mm) integral probe cable, 10 = 10-foot (3.05 m) extension cable, 02 = 2-meter armored interconnect cable, CN = metric-compatible connector termination. This specific cable geometry is selected for installations where the bearing housing-to-junction-box distance falls within the 3.4–3.6 m total cable range, a common dimensional constraint in mid-frame gas turbine and centrifugal compressor bearing pedestals.

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Technical Parameters

Hardware Logical Analysis

The 330103-00-15-10-02-CN probe body houses a precision-wound coil embedded in a thermoplastic housing with a stainless-steel tip guard. The coil geometry is laser-calibrated to maintain consistent inductance across the production batch, ensuring that the scale factor deviation between individual probes remains within ±1% of the nominal −200 mV/mil — a tolerance critical for multi-probe differential measurements such as X-Y orbit analysis.

The 2-meter armored cable segment serves a dual mechanical and electrical function. Mechanically, the stainless-steel braid armor resists crush loads, abrasion from vibrating pipe lagging, and hydrocarbon fluid ingress in bearing drain areas. Electrically, the armor acts as a Faraday shield, attenuating capacitively coupled interference from adjacent power cables. In installations near variable-frequency drives (VFDs) or high-current motor feeders, this shielding reduces common-mode noise injection into the probe’s coaxial signal path, preserving signal integrity at the Proximitor input.

The CN connector termination uses a threaded metal coupling nut with gold-plated center pin and PTFE dielectric, maintaining a characteristic impedance of 50 Ω along the coaxial signal path. Impedance continuity across the probe-extension-driver chain is essential: any impedance discontinuity introduces reflections that distort the Proximitor’s demodulated DC output, manifesting as apparent vibration offsets or false gap voltage readings. The CN connector’s machined metal body also provides a low-impedance ground bond between the cable shield and the junction box chassis, completing the EMC shielding circuit.

The extension cable’s 10-foot (3.05 m) length is not arbitrary. Bently Nevada’s transducer system is calibrated as a matched set: probe + extension cable + Proximitor. The total cable capacitance and inductance determine the resonant frequency of the LC tank circuit. Substituting a non-standard cable length shifts the tank resonance, altering the scale factor and potentially moving the linear measurement range outside the calibrated gap window. The 330103-00-15-10-02-CN is factory-matched to the 3300 XL 8mm Proximitor to deliver the specified −200 mV/mil scale factor at the standard 1.0 mm (40 mil) nominal gap.

System Integration Benefits

• API 670 Compliance Out-of-Box: The 330103-00-15-10-02-CN meets the transducer performance requirements of API 670 (5th Edition) without additional field calibration, enabling direct use in new installations and replacement projects subject to machinery protection standards.
• Deterministic Alarm Response: When integrated with the 3500 Series rack, the probe’s analog output is sampled at the rack’s I/O module scan rate (typically 5 ms per channel), ensuring that vibration threshold crossings trigger relay outputs within one scan cycle — a response latency compatible with API 670’s 1-second trip time requirement.
• X-Y Orbit Reconstruction: Deploying two 330103-00-15-10-02-CN probes at 90° around a shaft journal, connected to a dual-channel 3500/40M monitor, enables real-time orbit plot generation in System 1 software — providing direct visualization of shaft centerline position and precession direction for bearing condition assessment.
• Axial Position Monitoring: A single probe mounted axially against a thrust collar provides continuous differential expansion measurement with sub-mil resolution, enabling early detection of thrust bearing wear before axial clearance is consumed.
• Seamless 3500 Rack Integration: The probe’s −200 mV/mil output is directly compatible with the 3500/40M, 3500/42M, and 3500/44M monitor modules without signal conditioning adapters, reducing panel wiring complexity and eliminating potential signal chain error sources.
• System 1 Diagnostic Transparency: Gap voltage trending in System 1 software provides a continuous record of probe-to-shaft clearance, enabling maintenance teams to detect probe fouling, shaft runout changes, or bearing housing movement before they affect vibration measurement accuracy.
• Hot-Swap Replacement Compatibility: The probe’s standardized mechanical dimensions (8mm body, M10×1 thread) and matched cable configuration allow field replacement without rack reconfiguration or Proximitor re-gapping, minimizing maintenance downtime on critical machinery trains.
• Multi-Machine Scalability: A single 3500 rack can accommodate up to 16 proximity probe channels using 330103-series probes, supporting complete monitoring of a two-bearing turbine-compressor train (4 radial + 1 axial per machine) within a single chassis — reducing panel footprint and inter-rack communication latency.

Quality Assurance & Global Logistics

Every 330103-00-15-10-02-CN unit supplied by siemensplc.com is sourced from verified Bently Nevada (Baker Hughes) authorized distribution channels. Each probe is inspected upon receipt for connector pin integrity, cable sheath continuity, and probe tip surface condition. Coaxial impedance is verified with a TDR (time-domain reflectometer) check to confirm shield continuity and absence of cable damage from transit. Units exhibiting any impedance anomaly, connector damage, or physical deformation are quarantined and not offered for sale.

Shipments originate from our Xiamen, China warehouse, located within the Xiamen Free Trade Zone — a logistics hub with direct access to Xiamen Gaoqi International Airport (XMN) and Xiamen Port, two of China’s primary export gateways. Standard export documentation includes commercial invoice, packing list, certificate of origin, and — upon request — manufacturer’s certificate of conformance and material traceability records. Air freight to major industrial hubs (Houston, Rotterdam, Singapore, Dubai) typically achieves 3–5 business day transit. Sea freight consolidation is available for bulk orders. All shipments are insured and tracked door-to-door.

The 12-month warranty covers manufacturing defects in the probe coil, cable assembly, and connector. Warranty claims are processed with a replacement-first policy: a replacement unit is dispatched upon receipt of the defective item and photographic evidence of the fault condition, minimizing equipment downtime for the end user.

Contact Information

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