Bently Nevada 330104-00-17-05-02-CN Proximity Transducer – 3300 XL Series

Bently Nevada 330104-00-17-05-02-CN: Non-Contact Shaft Measurement in High-Severity Rotating Machinery

The 330104-00-17-05-02-CN is an 8 mm eddy-current proximity probe manufactured by Bently Nevada as part of the 3300 XL Series transducer platform. It delivers continuous, non-contact measurement of shaft radial vibration, axial position, and differential expansion across a linear range of 0.25 mm to 2.25 mm (10 mil to 90 mil). The probe operates on the eddy-current induction principle: a high-frequency oscillator drives a coil wound at the probe tip, generating an electromagnetic field that interacts with the conductive target shaft surface. As the gap between probe tip and shaft changes, the field loading shifts, producing a proportional DC voltage output at a calibrated scale factor of 7.87 V/mm (200 mV/mil). This output is conditioned by a paired Proximitor® driver and fed directly into protection or condition-monitoring racks such as the Bently Nevada 3500 series.

The -CN suffix designates the Chinese-market connector variant — a locally standardized connector body that eliminates field adapter requirements in domestic installations. Electrically and metrologically, the unit is identical to the international standard variant. It carries full API 670 (5th Edition) compliance, ATEX Ex ia IIC T6 certification, IECEx approval, and FM Class I Division 1 listing, making it deployable in Zone 0/1 hazardous areas without supplementary protection hardware.

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Technical Parameters

Hardware Logical Analysis

The 330104-00-17-05-02-CN probe tip houses a precision-wound ferrite-core coil encapsulated in a thermally stable polymer body. The oscillator circuit, resident in the paired Proximitor® driver (e.g., 330180 series), operates at approximately 1.0 MHz. At this carrier frequency, the skin depth in AISI 4140 steel is roughly 8 µm — shallow enough that surface finish variations below Ra 0.8 µm do not materially affect scale factor linearity. The coil-to-shaft gap modulates the Q-factor of the LC tank circuit; the driver demodulates this AM signal and outputs a DC voltage proportional to gap distance.

EMC Design: The coaxial cable assembly uses a double-shielded construction — inner braid at signal ground, outer braid at chassis ground — providing greater than 60 dB of common-mode rejection against VFD switching noise in the 2 kHz to 20 kHz band. The CN connector body incorporates a 360° circumferential shield termination, eliminating the pigtail ground path that is a known EMI ingress point in lower-grade transducer assemblies.

Thermal Stability: The probe body material has a coefficient of thermal expansion (CTE) matched to the coil former, maintaining scale factor drift below ±0.5% across the full –35 °C to +177 °C probe temperature range. This is critical in hot-section turbine bearing pedestals where ambient temperatures can exceed 120 °C during steady-state operation.

Intrinsic Safety Architecture: The ATEX Ex ia IIC T6 certification requires that the Proximitor® driver incorporate galvanic isolation barriers limiting fault energy at the probe terminals to below the ignition threshold for Group IIC gases (hydrogen, acetylene). The 330104 probe is a passive element in this circuit — its coil impedance at 1 MHz is approximately 3.5 Ω resistive and 18 µH inductive, well within the barrier’s safe operating envelope. No additional zener barriers are required at the field junction box when the system is installed per the Bently Nevada control drawing 141471.

Backward Compatibility: The 3300 XL platform maintains electrical backward compatibility with 3300 series monitors (3300/16, 3300/20) and forward compatibility with 3500 series racks (3500/42M, 3500/40M). The probe’s –2 V to –18 V output range and 7.87 V/mm scale factor are preserved across all compatible monitor generations, protecting existing calibration records and alarm setpoints when upgrading monitor hardware.

System Integration Benefits

• API 670 Plug-and-Play: Pre-calibrated at 7.87 V/mm, the probe integrates directly into API 670-compliant protection racks without field calibration, reducing commissioning time by eliminating the gap-setting iteration loop on new installations.
• Deterministic Latency: The analog output path from probe tip to monitor input introduces less than 50 µs of signal latency, ensuring that shaft orbit data presented to the 3500 rack reflects actual shaft position within one protection system scan cycle (typically 20 ms).
• Dual-Use Measurement: A single probe simultaneously provides radial vibration (AC component, 0–10 kHz) and average shaft centerline position (DC component), eliminating the need for separate displacement sensors and reducing penetration count in bearing housings.
• Hazardous Area Deployment: ATEX/IECEx Ex ia IIC T6 certification covers the most demanding gas group (IIC), allowing installation in hydrogen-service compressor trains and acetylene-handling facilities without zone reclassification or purge-and-pressurization enclosures.
• DCS/SCADA Integration: When paired with the 3500/92 communication gateway, the probe’s conditioned signal is available as a 4–20 mA analog output or via Modbus RTU/TCP, enabling direct integration into Siemens PCS 7, Honeywell Experion, or ABB 800xA distributed control systems.
• Diagnostic Transparency: The DC gap voltage is continuously readable at the Proximitor® driver test points, allowing field technicians to verify probe-to-shaft gap without interrupting the protection system — a critical capability during online maintenance windows.
• Long-Lifecycle Asset Support: The 3300 XL platform has been in production since the mid-1990s. Replacement probes are dimensionally and electrically identical to original equipment, ensuring that plants with 20+ year asset lifecycles can source drop-in replacements without re-engineering bearing housing penetrations.
• Reduced Wiring Complexity: The CN connector variant eliminates field-fabricated adapter harnesses in Chinese domestic installations, reducing termination error risk and cutting installation labor by approximately 30 minutes per measurement point on multi-probe machines.

Quality Assurance & Global Logistics

Every 330104-00-17-05-02-CN unit dispatched from our Xiamen, China facility undergoes a structured pre-shipment verification protocol:

• Visual & Dimensional Inspection: Probe tip geometry, cable jacket integrity, and connector body condition verified against OEM reference drawings.
• Scale Factor Verification: Gap-setting fixture test confirms output at 1.0 mm gap is within –10.2 VDC ± 3% for AISI 4140 steel target material.
• Insulation Resistance: >100 MΩ at 500 VDC between coil circuit and cable shield, confirming jacket and coil former integrity.
• Serialization & Traceability: Each unit ships with a serialized inspection record; calibration documentation available on request.
• Genuine Bently Nevada Origin: Units sourced exclusively from authorized distribution channels and verified surplus with full chain-of-custody documentation — no grey-market or counterfeit-risk supply.

Logistics from Xiamen: standard international express (DHL/FedEx) delivers to most destinations in 3–5 business days. Air freight consolidation for bulk orders. Full export documentation package (commercial invoice, packing list, certificate of origin) provided as standard. Emergency shutdown support orders dispatched same day for in-stock items confirmed before 14:00 CST.

Contact Information

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