Bently Nevada 330905-00-13-10-01-00 Proximity Transducer – 3300 XL Series

Bently Nevada 330905-00-13-10-01-00: Eddy-Current Shaft Displacement Sensor for API 670 Machinery Protection

The 330905-00-13-10-01-00 is a field-proven eddy-current proximity transducer within the Bently Nevada 3300 XL Proximitor System. It functions as the primary sensing element in a three-component signal chain — probe, extension cable, and Proximitor module — delivering a DC-proportional voltage output that encodes rotor gap distance with sub-micron resolution. In machinery protection architectures governed by API 670, this sensor provides the raw displacement signal that drives radial vibration alarming, axial position monitoring, and differential expansion measurement on steam turbines, centrifugal compressors, boiler feed pumps, and large electric motors.

Unlike piezoelectric accelerometers, the eddy-current transducer operates without mechanical contact with the rotating shaft. The probe tip generates a high-frequency oscillating magnetic field (nominal carrier frequency: 1.0–2.0 MHz). When a conductive target — typically AISI 4140 steel shaft — enters the field, eddy currents are induced on the shaft surface. These currents load the oscillator circuit, attenuating the field amplitude in direct proportion to the probe-to-shaft gap. The Proximitor module demodulates this attenuation into a linear DC voltage ranging from –2 VDC (near gap) to –18 VDC (far gap), which is then sampled by the 3300 or 3500 series monitor at rates sufficient to resolve vibration frequencies from DC through 10,000 Hz.

The 330905-00-13-10-01-00 variant specifies a 1.3 m integral armored cable, M10×1.0 thread, 8 mm probe tip diameter, and 5 mm linear measurement range at a scale factor of 7.87 V/mm (200 mV/mil). These parameters are fixed at the factory and must be matched to the Proximitor module calibration. Substituting a different cable length or probe geometry without recalibrating the Proximitor will introduce a systematic scale factor error that invalidates alarm setpoints.

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Technical Parameters

Hardware Logical Analysis

The 330905-00-13-10-01-00 probe tip houses a precision-wound coil embedded in a thermoplastic-filled stainless steel housing. The coil forms the inductive element of a Colpitts-type LC oscillator circuit located in the Proximitor module. The probe cable — 1.3 m of armored, impedance-controlled coaxial construction — is not a passive conductor; its distributed capacitance and inductance are integral to the oscillator tuning. This is why the cable length is encoded in the part number suffix and cannot be field-modified without invalidating the calibration.

EMC Design: The armored cable jacket provides a continuous Faraday shield from probe tip to Proximitor input, attenuating radiated interference from variable-frequency drives, arc welders, and high-current bus bars common in industrial environments. The shield is grounded at the Proximitor end only (single-point grounding) to prevent ground-loop currents from injecting common-mode noise into the signal path. In installations where the monitor rack is located more than 3 m from the machine, the 330130 extension cable maintains shield continuity and controlled impedance, preserving the oscillator Q-factor and scale factor accuracy across the full cable run.

Thermal Stability: The 316L stainless housing exhibits a coefficient of thermal expansion of approximately 16 µm/m·°C. Over the –35°C to +85°C operating range, dimensional change of the probe tip geometry is less than 0.5 µm — negligible relative to the 5 mm measurement range. The Proximitor module compensates for oscillator drift using an internal temperature-referenced voltage reference, maintaining scale factor within ±1% across the full thermal envelope without field recalibration.

Hazardous Area Architecture: The ATEX II 2G Ex ia IIC T6 classification means the probe operates as an associated apparatus in an intrinsically safe circuit. The Proximitor module limits the energy available at the probe terminals to below the ignition threshold for Group IIC gases (hydrogen, acetylene). This is achieved through zener barrier or galvanic isolator circuits within the Proximitor, not within the probe itself. The probe is therefore passive from an IS perspective — its safety depends entirely on the Proximitor’s barrier design. Mixing 330905-series probes with non-IS Proximitor modules in Zone 1 areas is a code violation and must be avoided.

System Integration Benefits

• Deterministic DC-to-10 kHz bandwidth: The flat frequency response from DC through 10,000 Hz allows a single sensor to simultaneously capture slow-roll runout (sub-1 Hz), synchronous 1× vibration, and high-frequency subsynchronous instabilities such as oil whirl (typically 0.43–0.48×) without sensor switching or range changes.
• Direct monitor compatibility without signal conditioning: The –2 to –18 VDC output is natively accepted by 3300 and 3500 series monitor input cards. No intermediate signal conditioner, amplifier, or impedance matcher is required, reducing BOM complexity and eliminating an additional failure point in the signal chain.
• Plug-compatible with TDXnet field wiring: The 330905 probe mates directly with Bently Nevada TDXnet junction boxes, enabling star-wired field architectures where multiple probes share a common marshalling cabinet. This simplifies cable routing in large turbine halls and reduces conduit fill.
• System 1 software integration: The Proximitor output feeds directly into Bently Nevada System 1 condition monitoring software via the 3500 monitor’s Ethernet gateway. Trend data, orbit plots, and Bode diagrams are available in real time without additional data acquisition hardware.
• Single SKU for dual-certification installations: The ATEX and FM dual listing on a single part number eliminates the need to maintain separate SKUs for European and North American plant standards, reducing spare parts inventory and procurement complexity for multinational operators.
• IP67 ingress protection for wash-down environments: The sealed probe housing withstands temporary immersion to 1 m depth, making it suitable for installations in pump sumps, below-deck marine machinery spaces, and outdoor compressor stations subject to high-pressure wash-down.
• Non-contact operation eliminates wear-based drift: Because the probe never contacts the shaft, there is no mechanical wear mechanism to introduce measurement drift over time. Calibration intervals can be extended to scheduled turnaround cycles (typically 4–6 years) rather than calendar-based intervals, reducing maintenance labor costs.
• Rotor orbit reconstruction for bearing diagnostics: Two probes mounted at 90° on the same bearing plane provide X-Y displacement signals that the 3500 monitor combines into a real-time rotor orbit display. Orbit shape analysis — circular, elliptical, figure-eight — directly indicates bearing condition, misalignment, and rub events without additional instrumentation.

Quality Assurance & Global Logistics

Every 330905-00-13-10-01-00 unit supplied by siemensplc.com is sourced from verified Bently Nevada authorized distribution channels. Each probe assembly carries a factory calibration certificate traceable to the specific Proximitor module it was calibrated with. Material certificates for the 316L stainless housing and ATEX/IECEx declarations of conformity are available upon request for inclusion in plant safety documentation packages.

Pre-shipment inspection covers visual examination of the probe tip and housing for mechanical damage, connector pin integrity check on the Proximitor-end connector, cable continuity and insulation resistance verification, and confirmation of part number label against the purchase order. Units are packed in original OEM packaging or equivalent ESD-safe foam-lined cartons with desiccant packs to maintain storage integrity during transit.

Shipments originate from our Xiamen, China warehouse. Standard export documentation — commercial invoice, packing list, and certificate of origin — is prepared for every order. For orders requiring ATEX documentation packages or material traceability records for pressure equipment directives, these are compiled and included at no additional charge. Typical transit times: 3–5 business days to Southeast Asia and the Middle East via DHL Express; 5–7 business days to Europe and North America via FedEx International Priority. Air freight tracking numbers are provided within 24 hours of dispatch. For urgent plant shutdowns requiring same-day dispatch, contact our team directly via WhatsApp.

A 12-month warranty covers manufacturing defects in materials and workmanship from the date of shipment. Warranty claims are processed with replacement unit dispatch within 48 hours of defect confirmation, minimizing plant downtime exposure.

Contact Information

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