Bently Nevada 330104-00-14-10-02-CN Proximity Probe – 3300 XL Series

Bently Nevada 330104-00-14-10-02-CN — 8mm Eddy-Current Proximity Probe for Shaft Vibration and Axial Position Measurement

The Bently Nevada 330104-00-14-10-02-CN is a precision 8mm eddy-current proximity transducer designed for continuous, non-contact measurement of shaft radial vibration, axial position displacement, and differential thermal expansion in critical rotating machinery. Operating within the 3300 XL Series transducer system, this probe forms the primary sensing element of a three-component measurement chain — probe, extension cable, and driver/oscillator — that collectively delivers a calibrated DC voltage output proportional to the gap between probe tip and target surface.

The CN suffix designates the Chinese-market connector variant, engineered for direct compatibility with domestic junction box standards and local conduit termination practices prevalent in Chinese petrochemical, power generation, and heavy industrial facilities. This is not a field-modified unit; the CN connector is factory-installed and factory-calibrated as an integral part of the probe assembly.

This probe is specified under API 670 (5th Edition) — the machinery protection standard mandated by EPC contractors and end-users across oil & gas, LNG, and refinery applications globally. Its DC-to-10,000 Hz frequency response captures the full spectrum of rotor dynamic phenomena, from slow-roll runout at startup through subsynchronous instabilities and high-frequency gear mesh events.

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Technical Parameters

Hardware Logical Analysis

The 330104-00-14-10-02-CN operates on the Lenz’s Law induction principle. The probe tip houses a wound coil energized at a carrier frequency generated by the paired 3300 XL driver/oscillator (typically 200 kHz). When a conductive target enters the probe’s electromagnetic field, eddy currents are induced on the target surface, loading the coil and reducing its effective impedance. The driver circuit converts this impedance change into a DC voltage output with a linear transfer function of 7.87 V/mm across the calibrated gap range of 0.25 to 2.25 mm.

EMC and Shielding Architecture: The integral cable uses a coaxial construction with a continuous braided shield referenced to driver ground. This topology suppresses common-mode noise injection from adjacent power cables and variable-frequency drives — a persistent interference source in compressor trains and motor control centers. The PTFE jacket provides dielectric stability across the full operating temperature range, preventing capacitance drift that would otherwise shift the probe’s effective sensitivity.

Thermal Stability: The 316 stainless steel probe body has a low coefficient of thermal expansion relative to the target shaft material. In high-temperature bearing housings (up to 120°C), this dimensional stability ensures that thermal growth of the probe body does not introduce a false DC offset into the gap signal — a critical requirement for accurate axial position and differential expansion measurements on steam turbines.

Target Material Sensitivity: The standard factory calibration is performed against AISI 4140 steel. For non-standard target materials — Inconel 718, titanium alloys, or duplex stainless — the eddy-current penetration depth and resistivity differ, shifting the effective sensitivity by up to ±8%. Application engineers must apply a material correction factor or request a custom calibration curve when specifying this probe for non-ferrous shafts.

CN Connector Integrity: The CN connector variant uses a gold-plated center pin and a stainless steel locking collar, providing a low-resistance, vibration-resistant termination. The connector is factory-potted with epoxy at the cable entry point, eliminating moisture ingress paths that are a common failure mode in field-assembled connector assemblies.

System Integration Benefits

• Direct API 670 Compliance: The 330104-00-14-10-02-CN meets all transducer requirements of API 670 (5th Edition), including sensitivity tolerance (±5%), linear range, and temperature rating — eliminating the need for additional compliance documentation during EPC project audits.
• Deterministic Signal Latency: The analog DC output has zero processing latency from gap change to voltage output, enabling the paired 3300/16 or 3500/42M monitor to execute trip logic within its configured scan cycle — typically 20 ms — without signal conditioning delays.
• Plug-and-Play Replacement: The 330104-00-14-10-02-CN is a direct dimensional and electrical replacement for all prior 3300 XL 8mm probe variants. No recalibration of the monitor is required when the probe is replaced with a matched OEM driver, reducing planned maintenance downtime.
• Diagnostic Transparency via DC Bias Monitoring: The driver output includes a DC bias voltage that the 3300 XL monitor uses to verify probe-to-target gap is within the linear range. An out-of-range DC bias triggers a Not OK (NOK) alarm, providing immediate diagnostic indication of probe damage, target loss, or cable fault — without requiring a separate continuity test.
• Orbit Plot Capability: When installed in X-Y pairs at 90° (or 45° from vertical), two probes generate the shaft centerline orbit data required for rotor dynamic analysis. The matched sensitivity of 3300 XL probes ensures orbit plots are geometrically accurate without per-channel gain correction.
• Wide Bandwidth for Subsynchronous Detection: The DC-to-10 kHz frequency response captures oil whirl (typically 0.43–0.48× running speed) and oil whip instabilities that are invisible to accelerometer-based monitoring systems, providing earlier warning of bearing instability in journal-bearing machines.
• Hazardous Area Compatibility: With appropriate Zener barriers or galvanic isolators (e.g., MTL 787S+), the probe system can be deployed in ATEX Zone 1 and Zone 2 classified areas without hardware modification, supporting installation in offshore platforms and onshore refinery units.
• Long-Term Calibration Stability: The eddy-current sensing element has no moving parts and no consumable components. Field experience across the 3300 XL installed base demonstrates calibration drift of less than 1% over a 5-year continuous service interval under normal operating conditions, reducing the frequency of scheduled calibration outages.

Quality Assurance & Global Logistics

Every Bently Nevada 330104-00-14-10-02-CN unit dispatched from our Xiamen, China facility undergoes a structured pre-shipment verification protocol:

• Documentation Traceability: Factory test certificates and part number traceability records are verified against the physical unit label and connector marking before acceptance into inventory.
• Physical Inspection: Probe tip geometry, cable jacket condition, connector locking mechanism, and OEM label integrity are inspected against Bently Nevada published dimensional standards.
• Functional Bench Verification: Output voltage is measured against a calibrated AISI 4140 steel target at three reference gap distances (0.5 mm, 1.25 mm, 2.0 mm) to confirm sensitivity is within the ±5% API 670 tolerance band.
• Packaging: Units are dispatched in original OEM anti-static packaging with desiccant, inside a rigid outer carton rated for international air and sea freight handling.

From our Xiamen warehouse, we support express air freight to most global destinations with typical transit times of 3–5 business days to Southeast Asia, the Middle East, and Europe. Sea freight consolidation is available for project bulk orders. All shipments include commercial invoice, packing list, and certificate of origin documentation required for customs clearance.

Contact Information

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