Bently Nevada 330104-10-16-05-01-00 Proximity Probe – 3300 XL Series

330104-10-16-05-01-00 — 10 mm Eddy Current Proximity Probe in the Bently Nevada 3300 XL Transducer Chain

The 330104-10-16-05-01-00 is a 10 mm diameter eddy current proximity probe manufactured by Bently Nevada (Baker Hughes) for the 3300 XL Proximity Transducer System. It ships with a 5-metre (16 ft) integral armored cable, a nominal −5 V DC output bias, and a 1-metre extension cable interface. Within a machinery protection architecture, this probe functions as the primary displacement-sensing element: it converts the physical gap between its tip and a rotating shaft surface into a calibrated DC voltage signal, which downstream monitors then compare against API 670-defined alarm and danger thresholds.

The 3300 XL platform is the de facto standard for continuous shaft radial vibration, axial position, and differential expansion measurement on critical turbomachinery — steam turbines, centrifugal compressors, gas turbines, and boiler feed pumps — where undetected rotor anomalies can escalate to catastrophic mechanical failure within seconds. The 330104 probe series anchors this measurement chain at the physical layer, and its dimensional and electrical parameters are the reference against which all downstream signal conditioning is calibrated.

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Technical Parameters

Hardware Logical Analysis

The operating principle of the 330104 probe is grounded in Faraday’s law of electromagnetic induction. The probe tip houses a precision-wound coil driven by a high-frequency oscillator (typically 1.0 MHz carrier) embedded in the paired 3300 XL proximitor driver. This oscillator sustains a stable electromagnetic field that projects axially from the probe face. When a conductive target — the shaft — enters this field, eddy currents are induced on the shaft surface. These eddy currents generate a counter-magnetic field that loads the probe coil, reducing its effective inductance and quality factor (Q). The proximitor demodulates this impedance shift into a DC voltage output linearly proportional to the probe-to-shaft gap across the 0.25–2.25 mm linear range.

EMC and Noise Immunity: The 3300 XL system employs a differential coaxial signal path from probe tip through extension cable to proximitor. The coaxial geometry provides inherent common-mode rejection, attenuating capacitively coupled interference from adjacent power cables and motor drives. The integral cable’s braided shield is grounded at the proximitor end only (single-point grounding), eliminating ground-loop currents that would otherwise appear as low-frequency noise on the displacement signal. In environments with high-frequency switching noise (VFD-driven auxiliaries, for example), the −3 dB bandwidth of 10 kHz acts as a hardware anti-aliasing filter, rejecting out-of-band interference before digitization.

Thermal Stability: The probe coil is wound on a ceramic bobbin with a controlled thermal expansion coefficient matched to the 316 SS housing. This minimizes thermally induced dimensional changes in the coil geometry, which would otherwise shift the scale factor across the operating temperature range. The −35 °C to +177 °C qualification envelope covers bearing housing temperatures encountered in hot-section steam turbine applications without requiring external cooling or thermal isolation hardware.

Intrinsic Safety Architecture: The probe itself is a passive inductive element — it contains no active electronics. All oscillator and demodulation circuitry resides in the proximitor driver, which is mounted outside the hazardous area or behind a certified barrier. This architecture means the probe cable carries only low-energy signals, enabling ATEX/IECEx Zone 0/1 installation without additional Zener barriers in most certified configurations. The FM and CSA approvals extend this coverage to North American Class I Division 1 hazardous locations.

System Integration Benefits

• Direct API 670 compliance: The 330104 probe, when paired with a 3300 XL proximitor and monitor, forms a complete API 670-certified measurement channel. No additional signal conditioning or scaling is required to meet the standard’s accuracy and response time requirements for radial vibration and axial position protection.
• Deterministic signal latency: The analog output path from probe to monitor introduces less than 100 µs of signal latency, ensuring that the protection system’s response time budget is dominated by the monitor’s relay logic, not the transducer chain. This is critical for overspeed and thrust position protection where millisecond-level response is specified.
• Plug-and-play monitor compatibility: The 330104 is electrically and mechanically compatible with all 3300 XL monitor cards — 3300/16, 3300/20, 3300/25, 3300/55 — and with the 3500 series rack monitors via appropriate interface modules. No re-ranging or scale factor adjustment is required when replacing probes within the same series.
• System 1 software integration: The calibrated −5 V DC bias and 7.87 V/mm scale factor are pre-configured in Bently Nevada System 1 asset management software. Probe replacement does not require software reconfiguration, reducing maintenance downtime to the physical swap and gap verification procedure.
• Diagnostic transparency: The DC bias voltage at the monitor input provides a continuous health indicator for the transducer chain. A bias outside the −4 V to −6 V window at nominal gap indicates probe damage, cable fault, or proximitor failure — enabling fault isolation without removing the probe from service.
• Non-contact wear-free operation: The eddy current measurement principle involves no mechanical contact with the rotating shaft. Probe service life is independent of shaft speed, vibration amplitude, or number of start-stop cycles. In continuous-duty applications running at 3,000–15,000 RPM, this translates to multi-year probe service intervals with no degradation in measurement accuracy.
• Hazardous area deployment without barriers: The intrinsically safe certification eliminates the need for Zener barriers or galvanic isolators in Zone 0/1 installations, reducing panel space requirements and eliminating a potential failure point in the signal path.
• Corrosion resistance in process environments: The 316 SS housing withstands continuous exposure to H₂S-bearing atmospheres, steam condensate, and hydrocarbon process fluids without dimensional degradation that would shift the probe’s gap-to-voltage calibration. This is particularly relevant in sour gas compression and refinery service.

Quality Assurance & Global Logistics

Every 330104-10-16-05-01-00 unit supplied through siemensplc.com is sourced from verified Bently Nevada (Baker Hughes) authorized distribution channels with full part traceability. Prior to dispatch from our Xiamen, China facility, each probe assembly undergoes a pre-shipment inspection protocol covering dimensional verification of the probe tip geometry, electrical continuity and insulation resistance measurement on the integral cable, coaxial connector integrity check, and visual inspection of the housing and cable jacket for transit damage. Original OEM packaging is preserved throughout the storage and handling process, including anti-static and moisture-barrier protection for the cable assembly.

Factory calibration documentation — including the OEM test report confirming scale factor and linearity within specification — is included with each shipment. Application-specific NIST-traceable calibration certificates are available on request for critical protection applications requiring documented measurement uncertainty.

Logistics from Xiamen are executed via DHL Express, FedEx International Priority, and UPS Worldwide Expedited, with typical transit times of 3–5 business days to major industrial hubs in Europe, the Middle East, Southeast Asia, and the Americas. EXW Xiamen terms are available for customers arranging their own freight forwarding. Export documentation — commercial invoice, packing list, certificate of origin, and MSDS where applicable — is prepared to the destination country’s import requirements. The 12-month warranty covers manufacturing defects from the date of shipment and is supported by our technical team for fault diagnosis and replacement coordination.

Contact Information

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