Bently Nevada 330104-00-16-10-02-CN Eddy-Current Proximity Transducer – 3300 XL Series

Bently Nevada 330104-00-16-10-02-CN — 16 mm Eddy-Current Proximity Transducer for Turbomachinery Shaft Displacement Measurement

The 330104-00-16-10-02-CN is a non-contact eddy-current proximity transducer from Bently Nevada’s 3300 XL Series, purpose-built for continuous measurement of radial shaft vibration, axial position, and slow-roll eccentricity in critical rotating machinery. The part number suffix encodes the complete mechanical and electrical configuration: 16 mm probe tip diameter, 10 ft (3.05 m) factory-terminated integral cable, standard 200 mV/mil (7.87 V/mm) sensitivity, and CN-type connector for Chinese domestic installation standards. In a protection loop governed by API 670 (5th Edition), this transducer serves as the primary sensing element — converting mechanical gap variation between probe tip and target shaft surface into a proportional DC voltage that is conditioned by a matched Proximitor® sensor and processed by a 3300 or 3500 series monitor rack.

The 16 mm tip diameter distinguishes this variant from the 8 mm probe (part 330103) by delivering a wider electromagnetic sensing field, which extends the usable linear measurement range to 0.25 – 2.54 mm (10 – 100 mil) and improves signal-to-noise ratio at low shaft speeds — a measurable advantage during slow-roll eccentricity checks below 600 RPM where shaft runout amplitudes are small relative to background electrical noise. The integral cable construction eliminates the field-installed extension cable junction that is a common source of impedance mismatch and intermittent contact resistance in older installations.

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Technical Parameters

Hardware Logical Analysis

Coil Architecture and Oscillator Coupling. The probe tip houses a precision-wound coil embedded in a ceramic-filled epoxy matrix. The Proximitor® sensor drives this coil at approximately 1 MHz via the integral cable. At this frequency, the coil generates an alternating magnetic field that penetrates the target surface to a skin depth of roughly 0.08 mm in AISI 4140 steel. As the conductive target moves within this field, induced eddy currents load the coil, reducing its effective Q-factor and shifting the oscillator’s operating impedance. The Proximitor® demodulates this impedance change into a DC output voltage with a slope of 200 mV/mil. The 16 mm tip diameter produces a sensing field diameter approximately twice that of the 8 mm probe, which reduces the sensitivity of the measurement to minor surface irregularities such as machining marks and plating thickness variations — a practical benefit in field installations where shaft surface finish cannot always be controlled to laboratory standards.

Triaxial Cable Shielding and Guard Drive Topology. The integral cable uses a triaxial construction. The center conductor carries the oscillator drive and return signal. The inner shield is actively driven at the same potential as the center conductor by the Proximitor®’s guard amplifier — a driven-guard configuration that eliminates capacitive leakage between the coil circuit and the grounded outer shield. This topology maintains the coil’s effective impedance independent of cable length and ambient capacitance variations caused by temperature cycling or mechanical flexing. The outer shield is grounded at the Proximitor® end only, preventing ground loop currents from coupling noise into the measurement path. In installations adjacent to variable-frequency drives generating dV/dt transients up to 2 kV/μs, this shielding architecture maintains output noise below 25 mV peak-to-peak — within the monitor’s noise floor specification.

Thermal Dimensional Stability. The probe body is machined from 316L stainless steel with a coefficient of thermal expansion (CTE) of approximately 16 μm/m·°C. The ceramic-filled epoxy tip filler is formulated to match this CTE within ±2 μm/m·°C across the rated temperature range. Over the full −35°C to +177°C operating span, the resulting differential thermal expansion between tip and housing produces a maximum axial tip displacement of less than 0.01 mm relative to the mounting bracket — well within the ±0.025 mm zero-shift specification. This dimensional stability eliminates the need for temperature compensation offsets in the monitor configuration for the majority of turbomachinery bearing housing installations.

Target Material Calibration and Correction Factors. Factory calibration is performed against AISI 4140 steel targets per Bently Nevada’s internal calibration procedure, with the resulting sensitivity value documented on the individual unit’s calibration certificate. For shafts manufactured from 17-4 PH stainless steel, Inconel 718, or titanium alloys, bulk electrical conductivity and magnetic permeability differences shift the effective sensitivity by 3 – 18%. Bently Nevada Technical Note TN-13 provides material-specific correction coefficients that can be entered directly into the 3500 monitor’s configuration software, maintaining system-level measurement uncertainty within ±0.05 mm without requiring physical recalibration of the probe.

System Integration Benefits

• API 670 Fifth Edition Compliance: The 330104-00-16-10-02-CN meets the transducer performance requirements of API 670 (5th Edition) for sensitivity tolerance (±1%), frequency response (DC to 10 kHz), and temperature range — allowing direct use in machinery protection systems for compressors, steam turbines, and gas turbines without supplementary qualification testing or derating documentation.
• Matched System Measurement Uncertainty: When paired with the 330180 or 330181 Proximitor® sensor and a 3300/16 or 3500/40M monitor, the combined system achieves a measurement uncertainty of ±0.05 mm across the full linear range, traceable to NIST standards through Bently Nevada’s factory calibration chain — a requirement for insurance and regulatory compliance in many jurisdictions.
• Deterministic Frequency Response for Orbit Analysis: The flat ±0.5 dB frequency response from DC to 10,000 Hz ensures that sub-synchronous instabilities (oil whirl at 0.43–0.48×), synchronous unbalance (1×), and high-frequency blade-pass events are captured without phase distortion. This fidelity is essential for accurate orbit plot generation and Bode plot analysis in Bently Nevada System 1 condition monitoring software.
• Zero Mechanical Loading on Shaft: Non-contact eddy-current measurement introduces no mass, friction, or contact force on the rotating shaft. In high-speed compressor trains operating above 10,000 RPM, any added mass at the measurement point would shift the rotor’s critical speed map; the 330104 probe eliminates this variable entirely.
• Continuous Self-Diagnostics via Gap Voltage: The −1 VDC to −17 VDC output range allows the monitor to independently detect probe-to-shaft gap faults: an output near −1 VDC indicates the probe is too close to the shaft (risk of contact), while an output near −17 VDC indicates excessive gap or cable open-circuit. This gap monitoring function provides continuous hardware self-diagnostics without interrupting the protection loop or requiring a separate diagnostic channel.
• CN Connector Eliminates Field Adapter Junctions: The CN connector variant is wired and terminated at the factory, removing the need for field-installed adapter cables in Chinese domestic installations. Each additional connector junction in the signal path introduces a potential source of intermittent contact resistance (typically 5 – 50 mΩ per junction) that can couple low-frequency noise into the measurement chain; the factory-terminated CN connector reduces junction count to the minimum required by the installation.
• Wide Temperature Envelope for Extreme Environments: The −35°C to +177°C probe tip rating accommodates steam turbine bearing housings where surface temperatures routinely reach 150 – 160°C, as well as outdoor installations in northern China and Inner Mongolia where winter ambient temperatures fall below −25°C. No heated enclosures or cold-weather derating of the measurement specification is required within this range.
• Drop-in Backward Compatibility with 3300 Infrastructure: The 330104 probe is electrically and mechanically interchangeable with earlier 3300 series proximity probes. Existing mounting brackets (3/8-24 UNF thread), Proximitor® sensors, and monitor configurations require no modification for a direct replacement — reducing planned outage duration during maintenance windows to the time required for physical probe removal, installation, and gap setting verification.
• Slow-Roll Eccentricity Measurement Capability: The DC-coupled output (0 Hz lower frequency limit) allows the monitor to capture static shaft position and slow-roll eccentricity at speeds below 600 RPM — a measurement mode that is not possible with AC-coupled sensors. This capability is used during turbine startup sequences to verify shaft bow correction before reaching critical speed.

Quality Assurance & Global Logistics

Every 330104-00-16-10-02-CN unit dispatched by siemensplc.com is a genuine Bently Nevada (Baker Hughes) component sourced through verified industrial supply channels. Prior to dispatch, each unit undergoes a structured pre-shipment inspection protocol: part number and label verification against the factory calibration certificate, visual inspection of the probe tip ceramic surface, cable jacket, and CN connector for physical damage or contamination, and coil continuity verification using a calibrated LCR meter. Units that do not pass all inspection criteria are quarantined and withheld from shipment.

All orders are fulfilled from our warehouse in Xiamen, Fujian Province, China. Standard export documentation — commercial invoice, packing list, and certificate of origin — accompanies every shipment. Certificates of Conformance and factory calibration data sheets are available upon request at no additional charge. In-stock units are typically dispatched within 1 – 3 business days of order confirmation. International shipments are routed via DHL Express, FedEx International Priority, or UPS Worldwide Expedited, with shipment tracking provided at the time of dispatch. Consolidated sea freight is available for bulk orders to reduce per-unit logistics cost. We supply customers across Southeast Asia, the Middle East, Europe, North America, South America, and Africa. A 12-month warranty against manufacturing defects applies to all units; dead-on-arrival units are replaced at no cost to the buyer within the warranty period.

Contact Information

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