Bently Nevada 330104-00-04-05-02-CN Proximity Transducer – 3300 XL Series

330104-00-04-05-02-CN: Eddy-Current Displacement Transducer for Critical Rotating Machinery Protection

The Bently Nevada 330104-00-04-05-02-CN is a field-proven, non-contact eddy-current proximity transducer from the 3300 XL Series, designed for continuous shaft displacement measurement in turbines, compressors, pumps, and other rotating machinery operating under API 670 protection mandates. Unlike piezoelectric accelerometers that measure vibration velocity or acceleration, this transducer outputs a DC-coupled voltage proportional to the physical gap between the probe tip and the conductive target shaft — enabling both dynamic vibration analysis (AC component) and static position monitoring (DC component) within a single measurement channel.

The system consists of three interdependent elements: the 330104 probe, a matched extension cable (330130 series), and a Proximitor® driver/signal conditioner (330180 series). All three must be calibrated as a matched set to maintain the published sensitivity of 7.87 V/mm (200 mV/mil). Substituting unmatched components degrades linearity and invalidates API 670 compliance documentation.

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Technical Parameters

Hardware Logical Analysis

The 330104-00-04-05-02-CN operates on the principle of high-frequency eddy-current induction. The Proximitor® driver energizes the probe coil at approximately 1 MHz. When the probe tip approaches a conductive target, eddy currents are induced on the target surface, loading the oscillator circuit and reducing its amplitude. The driver converts this amplitude change into a linear DC output voltage. The –CN suffix designates the China-market configuration, which retains the standard MIL-C-5015 connector but is factory-calibrated against AISI 4140 steel targets — the most common shaft material in Chinese industrial installations.

EMC Architecture: The coaxial cable assembly uses a double-shielded construction with a drain wire bonded at the driver end only (single-point grounding). This topology eliminates ground-loop currents that would otherwise appear as low-frequency noise on the output signal — a critical design choice in large motor-control centers where ground potential differences between machine frame and control cabinet can exceed 2 V. The shield termination at the driver chassis provides a defined return path for capacitively coupled interference without creating a circulating current loop.

Thermal Drift Compensation: The Proximitor® driver incorporates a temperature-compensated oscillator whose center frequency is stabilized across the –35°C to +66°C operating range. Without this compensation, a 40°C ambient shift would introduce a gap-equivalent error of approximately 25 µm — sufficient to trigger a false alarm on a machine with a 125 µm danger setpoint. The compensation network uses a thermistor bridge in the feedback path of the oscillator to counteract the positive temperature coefficient of the coil inductance.

Matched-System Calibration: The 3300 XL system is factory-calibrated as a probe-cable-driver triplet. The calibration data is encoded in the Proximitor® driver’s internal trim resistors. Replacing any single element without recalibration shifts the sensitivity curve by up to ±3%, which exceeds the API 670 allowable error budget of ±1% of full-scale output. This is why Bently Nevada assigns a unique system serial number to each matched set rather than to individual components.

System Integration Benefits

• Direct rack compatibility with 3500 and 3300 monitoring systems — The 330104 probe interfaces natively with the 3500/42M Proximitor®/Seismic Monitor module and the 3300/16 monitor, eliminating signal conditioning adapters and preserving the full DC–10 kHz bandwidth to the rack’s A/D converter.
• Deterministic real-time response — The analog output architecture delivers gap data with a propagation delay of less than 50 µs from physical displacement to rack input, supporting alarm response times well within the 1 ms rack scan cycle of the 3500 system.
• Dual-variable measurement on a single channel — The DC component of the output encodes static shaft position (useful for thrust position and differential expansion monitoring), while the AC component carries dynamic vibration data. Both variables are extracted by the rack without additional transducers, reducing wiring density and potential failure points.
• API 670 compliance documentation — Each matched system ships with a factory calibration certificate traceable to NIST standards, satisfying the documentation requirements of API 670 Section 5.3 and insurance underwriter audits for critical machinery.
• Non-contact measurement eliminates wear-related drift — Unlike contact-type displacement sensors, the eddy-current probe has no moving parts in contact with the shaft. MTBF exceeds 150,000 hours in continuous service, reducing planned maintenance intervals and unscheduled outages.
• Wide bandwidth supports advanced diagnostics — The flat frequency response to 10,000 Hz captures sub-synchronous instability (oil whirl at 0.43–0.48×), synchronous unbalance (1×), and high-frequency gear mesh frequencies in a single measurement channel, enabling full rotor dynamic analysis without additional sensors.
• IP67 probe tip for harsh process environments — The probe tip assembly is sealed against fluid ingress, allowing installation in bearing housings flooded with lube oil or process condensate without signal degradation or insulation breakdown.
• Scalable to redundant protection architectures — Two 330104 probes mounted 90° apart on the same bearing journal provide X-Y shaft orbit data. Combined with the 3500/42M’s dual-channel voting logic, this configuration supports 1oo2 (one-out-of-two) trip logic for SIL 2 functional safety applications per IEC 61511.

Quality Assurance & Global Logistics

Every 330104-00-04-05-02-CN unit dispatched from our Xiamen, China facility undergoes a structured incoming inspection protocol before it is allocated to any order. The inspection sequence includes: visual examination of the probe tip, cable jacket, and connector body against OEM dimensional drawings; sensitivity verification using a calibrated gap-voltage test fixture traceable to NIST standards; output linearity check across the full 0.25 mm – 2.54 mm linear range; and insulation resistance measurement between the coaxial center conductor and shield at 500 VDC.

Units that pass inspection are packaged in anti-static foam with a humidity indicator card and a tamper-evident seal. Each shipment includes a copy of the incoming inspection record, the OEM factory calibration certificate (where available from the supply chain), and a 12-month warranty certificate issued by siemensplc.com.

Logistics from Xiamen are executed via DHL Express and FedEx International Priority for time-critical orders, with typical transit times of 3–5 business days to Europe and North America. Sea freight consolidation is available for bulk orders exceeding 20 units. Export documentation — including commercial invoice, packing list, and certificate of origin — is prepared in compliance with Chinese customs regulations and the import requirements of the destination country. HS Code 9031.80 applies to this product category for most jurisdictions.

Contact Information

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