Bently Nevada 330730-080-13-00 Proximity Transducer – 3300 XL Series

Bently Nevada 330730-080-13-00 — Eddy-Current Proximity Transducer in Critical Machinery Protection Loops

The Bently Nevada 330730-080-13-00 is an 11 mm eddy-current proximity transducer belonging to the 3300 XL Series — a platform engineered specifically for continuous, non-contact measurement of shaft radial vibration, axial position, and differential expansion in high-speed rotating machinery. The suffix breakdown is precise: 330730 identifies the probe-and-cable assembly family; 080 denotes an 8.0 m armored extension cable; 13 specifies the 3300 XL Proximitor® driver module; 00 indicates the standard configuration without special agency approvals. This transducer system operates as a three-component chain — probe, extension cable, and Proximitor® sensor — and all three must be matched within the same calibrated set to maintain the ±0.5% full-scale linearity specification.

In a typical turbine or compressor protection architecture, the 330730-080-13-00 feeds a 4–20 mA or voltage signal directly into a Bently Nevada 3500 Series rack or a 3300 Series monitor. The Proximitor® driver converts the probe’s oscillator-demodulator output into a DC voltage proportional to the gap between the probe tip and the conductive target shaft. At the nominal 1.27 mm (50 mil) gap, the output sits at approximately −10 VDC; the usable linear range spans 0.25 mm to 2.79 mm (10–110 mil), giving the monitoring system a 2.54 mm (100 mil) measurement window with a sensitivity of 7.87 V/mm (200 mV/mil). This resolution is sufficient to detect sub-micron shaft displacement events that precede bearing failure or rotor instability.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

The 330730-080-13-00 operates on the eddy-current (inductive) measurement principle. The probe tip houses a flat coil driven by a high-frequency oscillator (typically 1.0 MHz carrier) embedded in the Proximitor® driver. When the probe approaches a conductive target, eddy currents are induced on the shaft surface, loading the oscillator circuit and reducing its amplitude. The demodulator stage in the Proximitor® converts this amplitude change into a proportional DC voltage output. The entire signal chain — oscillator, demodulator, and output buffer — is contained within the Proximitor® housing, which is mounted remotely from the probe, isolating sensitive electronics from the high-temperature, high-vibration environment at the bearing housing.

The 8.0 m extension cable (suffix -080) uses a coaxial construction with a characteristic impedance matched to the probe’s resonant circuit. Any substitution with a non-matched cable alters the distributed capacitance and inductance of the probe circuit, shifting the oscillator frequency and introducing a scale factor error that cannot be corrected by field calibration alone. This is why Bently Nevada supplies the probe, cable, and Proximitor® as a calibrated, serialized set.

EMC performance is achieved through the armored stainless braid over the PTFE-insulated coaxial core, which provides a continuous Faraday shield from the probe tip to the Proximitor® input. The 316L stainless steel probe housing resists corrosion in oil-mist and steam environments while maintaining dimensional stability across the full −35°C to +177°C probe temperature range. The Proximitor® driver’s internal voltage regulator rejects supply-rail noise down to the millivolt level, ensuring that power-supply ripple from the monitoring rack does not appear as false vibration signals in the output.

The 3300 XL platform introduced a tighter scale factor tolerance (±0.5% vs. ±1.0% on earlier 3300 series) by implementing a factory-matched calibration procedure where each probe-cable-Proximitor® set is characterized as a unit on a calibrated target fixture. The calibration data is encoded in the Proximitor® module’s internal resistor network, not in firmware, making the calibration immune to power cycling or firmware updates.

System Integration Benefits

• Direct rack compatibility: The −24 VDC supply and DC voltage output interface natively with Bently Nevada 3500 Series I/O modules (e.g., 3500/42M, 3500/45) and 3300 Series monitors without signal conditioning adapters.
• Deterministic latency: The analog output path introduces no digital processing delay; the Proximitor® output tracks shaft displacement in real time, with a frequency response flat to 10 kHz, supporting both 1× and 2× vibration component analysis.
• Matched-set traceability: Each assembly ships with a serialized calibration certificate linking probe, cable, and Proximitor® serial numbers, enabling full traceability for API 670 compliance audits.
• Reduced field wiring complexity: The 8.0 m pre-terminated extension cable eliminates field splicing between probe and Proximitor®, removing a common source of impedance mismatch and signal degradation in retrofit installations.
• High-temperature probe rating: The 177°C probe rating covers the bearing-housing environment of most steam turbines and gas compressors without requiring thermal standoffs or probe cooling provisions.
• Diagnostic transparency: The Proximitor® output voltage at rest (no shaft rotation) equals the static gap voltage, allowing maintenance technicians to verify probe installation gap with a standard DC voltmeter before commissioning.
• Redundancy-ready architecture: Two 330730-080-13-00 assemblies can be installed at 90° to each other on the same bearing journal to provide X-Y vibration vectors, feeding a 3500 rack configured for dual-channel voting logic in a 2oo2 or 2oo3 protection scheme.
• Interchangeable within matched-set constraint: Replacement of a failed probe requires only a new matched set (same suffix configuration), with no monitor reconfiguration, provided the Proximitor® module is also replaced as part of the set — minimizing mean time to repair (MTTR) in critical plant shutdowns.

Quality Assurance & Global Logistics

Every Bently Nevada 330730-080-13-00 unit supplied by siemensplc.com is sourced through verified industrial supply channels and subjected to a structured pre-shipment inspection protocol. Physical inspection covers probe housing integrity, cable jacket condition, connector pin alignment, and label legibility against Bently Nevada factory standards. Functional verification confirms Proximitor® output voltage at a known gap using calibrated test fixtures before packaging.

Shipments originate from our warehouse in Xiamen, China, with standard lead times of 3–7 business days for in-stock units. International express freight via DHL, FedEx, and UPS is available for time-critical plant maintenance requirements. All export documentation — commercial invoice, packing list, certificate of origin, and packing declaration — is prepared as standard. Anti-static foam packaging with rigid outer carton protects the probe tip and cable connector during transit. Real-time tracking is provided on all shipments. We serve customers across North America, Europe, Southeast Asia, the Middle East, and Australia. A 12-month warranty against manufacturing defects is included with every unit.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
© 2026 siemensplc.com. All rights reserved.