Bently Nevada 330910-00-22-50-02-00 Proximity Transducer – 3300 XL Series

Bently Nevada 330910-00-22-50-02-00: Eddy-Current Proximity Transducer System for Critical Rotating Machinery

The Bently Nevada 330910-00-22-50-02-00 is a factory-matched, three-component proximity transducer system belonging to the 3300 XL platform — a field-proven architecture deployed across gas turbines, steam turbines, centrifugal compressors, and large-frame pumps in oil & gas, power generation, and petrochemical facilities worldwide. The system consists of a matched probe, extension cable, and Proximitor® sensor, all calibrated as a single measurement chain to deliver traceable, repeatable gap-voltage output with a nominal sensitivity of 200 mV/mil (7.87 V/mm).

Unlike generic eddy-current sensors, the 330910 series is engineered to operate within the Bently Nevada signal-conditioning ecosystem. The Proximitor® oscillator-demodulator circuit drives the probe coil at a fixed radio frequency, inducing eddy currents in the target shaft surface. The resulting impedance change is demodulated into a DC-proportional voltage that represents radial displacement in real time — with a frequency response flat from DC to 10,000 Hz, covering both slow-roll runout capture and high-frequency sub-synchronous instability events.

The -00-22-50-02-00 configuration suffix encodes the following physical parameters: 22-inch (approximately 560 mm) probe cable, 50-foot (approximately 15.2 m) extension cable, standard 8 mm probe tip diameter, and a -02-00 connector/termination designation compatible with the 3300 XL Proximitor® housing. This specific cable geometry is dimensioned for standard bearing-housing-to-junction-box runs on mid-frame turbomachinery skids, eliminating field splicing and the associated signal integrity risks.

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Technical Parameters

Hardware Logical Analysis

The 330910-00-22-50-02-00 implements a three-wire, matched-impedance measurement chain. The Proximitor® sensor contains a Colpitts-type LC oscillator tuned to approximately 1.0 MHz. The probe coil, extension cable, and Proximitor® input impedance form a resonant network; any deviation in cable length or coil inductance shifts the resonant frequency and introduces a gain error. This is why Bently Nevada ships the 330910 as a factory-matched set — the extension cable’s distributed capacitance is characterized and compensated at the oscillator trim stage, ensuring the published 200 mV/mil sensitivity holds across the full operating temperature range without field recalibration.

EMC Architecture: The coaxial construction of both the probe cable and extension cable provides inherent common-mode rejection. The outer shield is grounded at the Proximitor® end only (single-point grounding), preventing ground-loop currents from modulating the carrier signal. In environments with high-frequency switching drives (VFDs operating at 2–16 kHz PWM frequencies), this topology attenuates conducted interference by more than 40 dB relative to unshielded sensor wiring.

Thermal Drift Compensation: The probe coil is wound on a ceramic former with a controlled thermal coefficient of inductance. Over the −35 °C to +177 °C probe operating range, the sensitivity variation is maintained within ±1% of the nominal 200 mV/mil value — a specification critical for bearing clearance trending in steam turbines where bearing metal temperatures routinely exceed 120 °C.

Gap Linearity: The eddy-current measurement exhibits a linear voltage-gap relationship across a defined window (typically 20–80 mil for 8 mm probes). Outside this window, the relationship becomes nonlinear. The 330910 datasheet specifies the linear range as 10–90 mil, with a residual nonlinearity of ≤ ±0.5% of full-scale output — sufficient for API 670 compliance in both radial vibration and axial position measurement channels.

System Integration Benefits

• API 670 Fifth Edition Compliance: The 330910 system meets the measurement chain requirements of API 670 for radial vibration (channels 1 & 2 per bearing), axial position, and differential expansion — enabling direct use in machinery protection systems without additional signal conditioning.
• Deterministic Latency: The analog output signal propagates from shaft surface to Proximitor® output terminal with a group delay of less than 100 µs across the full 10 kHz bandwidth, preserving phase relationships critical for orbit plot analysis and balancing calculations.
• Plug-and-Play with 3300 / 3500 Monitors: The −18 VDC output is directly compatible with Bently Nevada 3300 and 3500 series monitor input cards. No signal conditioner or scaling module is required; the monitor’s internal A/D converter accepts the raw Proximitor® output.
• DCS Integration via 4–20 mA: When paired with a 3500/42M Position Monitor or 3500/40M Proximitor I/O Module, the 330910 output can be retransmitted as a 4–20 mA analog signal for integration with DeltaV, Ovation, ABB 800xA, or Yokogawa CENTUM VP historian channels.
• PLC Compatibility: The Proximitor® analog output is compatible with high-impedance analog input modules on Siemens S7-300/400/1500, Allen-Bradley ControlLogix, and Schneider Modicon M580 platforms — enabling condition-based maintenance logic within the PLC scan cycle.
• Diagnostic Transparency: The 3300 XL Proximitor® provides a buffered output (BNC) that allows simultaneous connection of a portable data collector (e.g., CSI 2140, Emerson AMS 2140) without interrupting the protection channel — supporting online route-based data collection without process shutdown.
• Redundancy Support: Two 330910 probes can be installed at 90° (X–Y configuration) per bearing to generate full orbit plots. The 3500 monitor’s voting logic can arbitrate between redundant channels, issuing alerts only when both channels confirm an anomaly — reducing spurious trips in high-value machinery trains.
• Long Cable Runs: The 50-foot extension cable accommodates junction-box-to-control-room distances common in large turbine halls. For runs exceeding 50 ft, Bently Nevada specifies the use of a signal conditioning amplifier rather than extending the cable, and the 330910 system is pre-engineered to interface with those amplifiers without impedance mismatch.

Quality Assurance & Global Logistics

Every 330910-00-22-50-02-00 unit supplied through siemensplc.com is sourced from authorized distribution channels or verified OEM-surplus inventory with full traceability documentation. Pre-shipment inspection includes visual examination of probe tip, coil continuity measurement, and Proximitor® output voltage verification at the nominal 50-mil gap using a calibrated target fixture. A Certificate of Conformance (CoC) is issued with each shipment.

Packaging follows anti-static and moisture-barrier protocols: the probe assembly is individually bagged in ESD-safe polyethylene, placed in foam-lined rigid packaging, and sealed with desiccant sachets. The extension cable is coiled to a minimum bend radius of 75 mm to prevent coaxial dielectric deformation during transit.

Logistics are managed from our warehouse in Xiamen, China, with daily dispatch via DHL Express, FedEx International Priority, and UPS Worldwide Expedited. Typical transit times: 3–5 business days to Europe and North America; 2–4 business days to Southeast Asia and the Middle East. Sea freight consolidation is available for bulk orders exceeding 20 units. All shipments include commercial invoice, packing list, and HS code documentation (HS 9031.80) for smooth customs clearance.

Contact Information

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