Bently Nevada 330104-00-08-05-02-CN Proximity Transducer – 3300 XL

Bently Nevada 330104-00-08-05-02-CN: Eddy Current Proximity Transducer for Critical Rotating Machinery Protection

The 330104-00-08-05-02-CN is an 8 mm eddy current proximity transducer from Bently Nevada’s 3300 XL Series — a system architecture purpose-built for continuous, non-contact measurement of shaft radial vibration, axial position, and eccentricity in turbomachinery and rotating equipment operating under API 670 protection mandates. This transducer is not a general-purpose displacement sensor. Its design parameters, calibration methodology, and system integration logic are optimized for the specific demands of machinery protection: deterministic output linearity across the full operating gap, stable sensitivity across wide temperature gradients, and direct electrical compatibility with Bently Nevada 3500 Series monitoring racks without intermediate signal conditioning.

In a machinery protection loop, the proximity transducer occupies the first and most critical node. Any drift, nonlinearity, or installation error at the transducer level propagates directly into the monitor’s alarm and trip logic. The 330104-00-08-05-02-CN addresses this by delivering a calibrated sensitivity of 7.87 V/mm (200 mV/mil) with a linear measurement range of 0.25 mm to 2.25 mm — a 2 mm window that accommodates normal shaft runout, thermal growth, and bearing clearance variation without saturation or output clipping. The CN connector suffix designates the Chinese-market connector variant, which maintains full electrical equivalence to the standard international configuration while conforming to connector standards prevalent in domestic Chinese industrial installations.

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Technical Parameters

Hardware Logical Analysis

The 3300 XL 8mm transducer system operates on a three-component eddy current topology: probe, extension cable, and driver/oscillator. The driver generates a high-frequency oscillating magnetic field — typically in the range of 1.0 MHz to 1.5 MHz — through the probe coil. When a conductive target (shaft) enters the probe’s field, eddy currents are induced on the target surface, loading the oscillator circuit and reducing its amplitude. The driver converts this amplitude modulation into a DC-proportional output voltage, yielding the −24 VDC nominal bias that shifts linearly with gap distance at 7.87 V/mm.

The critical design constraint in this architecture is system matching. The probe coil inductance, extension cable capacitance, and driver oscillator circuit are tuned as a matched set. Substituting a non-matched extension cable — even one with identical physical dimensions — alters the resonant frequency of the LC circuit, shifting the sensitivity constant and invalidating the calibration. The 330104-00-08-05-02-CN is factory-calibrated as a complete system with its designated 330130 Series extension cable and 330180 Series driver. This matched-system approach eliminates field calibration variables and ensures that the 7.87 V/mm sensitivity is maintained across the full operating temperature range without manual adjustment.

EMC performance is achieved through the armored cable construction, which provides continuous shielding from the probe tip to the driver terminal. The shield is grounded at the driver end only — a single-point grounding scheme that prevents ground loop currents from inducing noise on the signal conductor. In high-EMI environments such as variable frequency drive (VFD) motor rooms or high-power switchgear areas, this shielding architecture maintains signal integrity at the millivolt level, which is essential for detecting early-stage bearing wear signatures that may produce vibration amplitudes below 25 µm peak-to-peak.

The probe tip geometry — 8 mm diameter — represents a deliberate balance between spatial resolution and gap sensitivity. Smaller probe diameters (e.g., 5 mm) offer higher spatial resolution for detecting localized shaft surface defects but exhibit reduced sensitivity at larger gaps. The 8 mm format provides a 2 mm linear range that is sufficient for standard API 670 radial vibration monitoring applications while maintaining adequate sensitivity for detecting sub-25 µm vibration amplitudes at shaft surface velocities up to 10,000 Hz.

System Integration Benefits

• Direct 3500 Series rack compatibility: The 330104-00-08-05-02-CN interfaces directly with Bently Nevada 3500/40M, 3500/42M, 3500/45, and 3500/46M monitors. No signal conditioning, impedance matching, or intermediate amplification is required. The monitor’s internal circuitry is designed to accept the −24 VDC bias output and 7.87 V/mm sensitivity constant natively, eliminating a potential source of calibration error.
• Deterministic frequency response to 10 kHz: The flat frequency response from DC to 10,000 Hz enables simultaneous measurement of slow-roll eccentricity (sub-1 Hz) and high-frequency vibration events (e.g., blade passing frequencies in centrifugal compressors operating at 3,000–10,000 RPM with multiple impeller vanes). A single transducer covers the full diagnostic frequency spectrum without range switching.
• Non-contact measurement eliminates mechanical loading: Because the eddy current principle requires no physical contact with the rotating shaft, the transducer introduces zero mechanical drag, zero wear, and zero mass loading on the rotor. This is particularly significant in high-speed turbomachinery where even milligram-level mass additions to the rotor can shift critical speed margins.
• Stable output across −35°C to +177°C probe range: The probe’s thermal stability specification ensures that the sensitivity constant does not drift beyond the system’s calibration tolerance across the full operating temperature envelope. In steam turbine bearing housings where ambient temperatures can exceed 120°C, this stability eliminates temperature-induced false alarms or missed trip conditions.
• Eccentricity and differential expansion measurement capability: Beyond radial vibration, the DC-coupled output enables static gap measurement for eccentricity monitoring (slow-roll shaft bow detection) and axial position tracking for differential thermal expansion between rotor and casing. A single transducer type serves multiple measurement functions depending on installation orientation and monitor configuration.
• CN connector variant reduces installation complexity in Chinese facilities: The CN connector designation eliminates the need for field-fabricated adapter cables or connector modifications when installing in Chinese industrial facilities that use domestic connector standards. This reduces installation time, eliminates a potential failure point, and maintains the factory-calibrated cable impedance characteristics.
• Armored cable withstands harsh process environments: The integral armored cable jacket resists oil mist, process fluid splash, and mechanical abrasion in bearing housing environments. The armor provides mechanical protection against cable damage from maintenance personnel working in confined spaces around rotating equipment.
• 12-month warranty with full traceability documentation: Each unit ships with inspection documentation confirming part number, serial number, and functional verification. The 12-month warranty period covers manufacturing defects and provides a defined accountability framework for procurement and maintenance records.

Quality Assurance & Global Logistics

Every 330104-00-08-05-02-CN unit supplied by siemensplc.com is sourced through verified channels with full part number and serial number traceability. Pre-shipment inspection covers visual examination of the probe tip, cable jacket integrity, connector condition, and label verification against OEM specifications. Electrical verification confirms output bias voltage and continuity of the signal and shield conductors.

Shipments originate from Xiamen, China — a major international logistics hub with direct access to DHL, FedEx, UPS, and SF Express international services. Standard export documentation — commercial invoice, packing list, and certificate of origin — is prepared for all international orders. For orders requiring ATEX or FM certification documentation, please specify at the time of inquiry. Anti-static, shock-absorbing packaging with humidity indicator cards is used for all transducer system shipments to protect the probe coil and cable assembly during transit. Typical international transit times: 3–5 business days to Southeast Asia, 5–7 business days to Europe and North America, subject to customs clearance.

Contact Information

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