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

Bently Nevada 330104-00-10-10-02-00: 8 mm Eddy-Current Proximity Probe for Continuous Shaft Displacement Measurement in Turbomachinery Protection Systems

The Bently Nevada 330104-00-10-10-02-00 is a factory-configured 8 mm eddy-current proximity probe within the 3300 XL Proximity Transducer System, engineered for permanent installation in bearing housing probe ports on rotating machinery subject to API 670 5th Edition machinery protection requirements. The probe generates a continuous analog DC voltage output whose instantaneous magnitude is a direct linear function of the air gap between the probe tip and the conductive shaft target surface. This non-contact measurement architecture eliminates all mechanical wear mechanisms from the sensing element, making the probe suitable for continuous, unattended operation across multi-year service intervals without scheduled replacement.

The part number suffix -00-10-10-02-00 is a deterministic electrical configuration descriptor, not a dimensional label. Each field encodes a specific parameter of the complete transducer loop: no special options; 10 mm integral cable; 10 mm extension cable; 2 m armored interconnect cable; standard coaxial connector termination. The total cable assembly capacitance defined by this suffix is the parameter to which the matched 3300 XL proximitor oscillator is tuned. Substituting any cable segment with a non-matched length shifts the oscillator operating point and introduces a systematic linearity error across the measurement range that cannot be corrected through monitor channel scaling. The suffix is a functional electrical specification with direct consequences for measurement accuracy.

Installed in bearing housings on centrifugal compressors, steam turbines, gas turbines, axial fans, and large motor-driven pump trains, this probe measures radial shaft vibration, axial shaft position, or differential thermal expansion — depending on installation orientation — and transmits the conditioned signal to a Bently Nevada 3500 Series monitoring rack or any API 670-compliant protection system. The probe body is rated for continuous operation at ambient temperatures from −35°C to +177°C, covering the full thermal range encountered at bearing housing locations across the turbomachinery spectrum.

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Technical Parameters

Hardware Logical Analysis

The 330104-00-10-10-02-00 probe tip houses a precision-wound inductive coil encapsulated within a vacuum-potted thermoplastic body. The potting process — executed under controlled temperature and vacuum conditions at the factory — serves two structurally independent functions. First, it immobilizes the coil geometry against vibration-induced micro-displacement, which would otherwise appear as spurious amplitude modulation superimposed on the shaft vibration signal. Second, it forms a hermetically sealed barrier against turbine lube oil, process gas condensate, and industrial cleaning solvents encountered at bearing housing locations. Neither function is achievable through field-applied sealing measures; both depend on the factory potting process.

The coaxial cable assembly is manufactured to a controlled total-capacitance specification. The 3300 XL proximitor oscillator operates at a specific loop capacitance — the arithmetic sum of the integral, extension, and armored cable capacitances encoded in the part number suffix. This is a tuned operating point. Any deviation from the specified cable configuration shifts the oscillator frequency and introduces a linearity error that cannot be corrected by adjusting the monitor channel scale factor. The cable suffix is therefore a functional electrical parameter, not a dimensional convenience label.

The coaxial construction provides inherent common-mode rejection along the full cable run. The shield is terminated at the proximitor chassis using a single-point ground topology, preventing ground loop formation between the probe mounting point at the bearing housing and the monitoring rack ground reference. In installations where the cable route passes through high-EMI environments — adjacent to variable-frequency drive output conductors, high-current bus duct, or motor terminal boxes — the armored outer jacket provides a second shielding layer that attenuates capacitively coupled interference before it reaches the inner coaxial conductor. The eddy-current measurement principle is inherently immune to electrostatic field interference because the coupling mechanism between probe tip and shaft target is inductive, not capacitive.

The gold-plated center pin on the coaxial connector eliminates oxidation-induced contact resistance increase over multi-year service intervals — a failure mode that has historically caused intermittent signal loss in proximity probe installations using base-metal connector terminations. The +177°C continuous temperature rating reflects the glass-transition temperature margin of the potting compound and the thermal stability class of the coil winding insulation, providing substantial thermal headroom above the 80°C–140°C bearing housing temperatures typical of steam turbine LP and HP sections.

System Integration Benefits

• API 670 5th Edition compliance as shipped: The 3300 XL transducer system with this probe meets API 670 transducer performance requirements without field calibration. Commissioning engineers proceed directly to gap-setting and monitor channel configuration, compressing installation schedules on new machinery protection projects.
• Continuous analog output with zero sampling latency: The eddy-current output is inherently continuous. The probe introduces no sampling interval, quantization error, or digital processing delay into the measurement chain. All bandwidth limiting is applied at the proximitor output filter — configurable up to 10 kHz for vibration measurements — preserving full signal fidelity to the monitoring rack input.
• Speed-independent, wear-free measurement: The non-contact principle means probe performance is independent of shaft peripheral velocity. The same probe specification applies equally to a 1,500 RPM pump shaft and a 20,000 RPM expander rotor. No speed-dependent wear mechanism exists to degrade measurement accuracy or require scheduled probe replacement based on shaft speed.
• Native compatibility with 3500 Series rack input modules: The −24 VDC powered, voltage-output signal from the matched proximitor is accepted directly by Bently Nevada 3500/25 and 3500/40M input modules. No signal conditioning, impedance matching, or protocol conversion is required between the transducer loop output and the monitoring rack input terminals.
• Static gap readout for installation verification: The DC component of the proximitor output encodes the static probe-to-shaft gap voltage. Maintenance technicians read this value directly from the 3500 monitor display to confirm correct installation gap — target range 1.0 mm to 1.5 mm for 8 mm probes — without removing the probe from the bearing housing or using external measurement instrumentation.
• Functionally interchangeable by complete part number: Any two probes sharing the identical full part number, including the cable suffix, are functionally interchangeable within an existing transducer loop without recalibration of the proximitor or monitor channel. This is operationally critical during emergency maintenance windows where recalibration time is unavailable.
• Reduced nuisance trip probability through high signal-to-noise ratio: The coaxial cable shielding and single-point grounding architecture suppress common-mode noise that would otherwise appear as spurious vibration amplitude on the monitor channel. In process-critical applications, this directly reduces the probability of machinery trips caused by instrumentation noise rather than actual mechanical events.
• Passive bearing wear diagnostics through gap trend analysis: Long-term trending of the static gap voltage reveals bearing clearance progression without additional hardware. As journal wear increases bearing clearance, the static gap voltage shifts measurably over time. This diagnostic capability is inherent in the DC component of the existing proximity measurement signal and requires no supplementary sensors or software modules beyond the standard monitoring rack historian function.
• Deterministic spare parts procurement: The fully encoded part number eliminates ambiguity in replacement ordering. Maintenance planners specify the complete suffix to procurement teams, ensuring the replacement unit matches the installed transducer loop geometry exactly — preventing cable capacitance mismatch errors that occur when partial part numbers are used for reordering.

Quality Assurance & Global Logistics

Every Bently Nevada 330104-00-10-10-02-00 unit dispatched from siemensplc.com undergoes a structured pre-shipment inspection sequence: part number label authentication against the specific suffix configuration; coaxial connector center pin condition assessment; armored cable jacket integrity check across the full 2 m length; and probe tip body inspection for potting compound separation or mechanical damage. Units that do not satisfy all inspection criteria are quarantined from available stock. There is no tiered quality grading — only units passing the complete inspection sequence are dispatched.

All shipments originate from our stocking facility in Xiamen, China, a primary export hub with established carrier agreements covering DHL Express, FedEx International Priority, and TNT Economy Express. Standard export documentation — commercial invoice, packing list, and certificate of origin — accompanies every consignment. Buyers requiring supplementary import documentation, such as FORM E for ASEAN preferential tariff treatment or specific customs declarations for regulated markets, should advise at order confirmation so documentation is prepared prior to dispatch.

Indicative transit times: 2–5 business days to East and Southeast Asia via express air freight; 4–7 business days to the Middle East and South Asia; 6–10 business days to Europe and the Americas. Orders confirmed before 14:00 CST qualify for same-day dispatch. Full shipment tracking references are provided at time of dispatch. The 12-month warranty covers confirmed manufacturing defects from the shipment date, with resolution by replacement unit or credit note following defect verification.

Contact Information

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