Bently Nevada 330104-10-15-50-02-00 Proximity Transducer – 3300 XL Series

Bently Nevada 330104-10-15-50-02-00 — Non-Contact Shaft Displacement Measurement in API 670 Machinery Protection Loops

The Bently Nevada 330104-10-15-50-02-00 is a complete 8 mm eddy-current proximity transducer system belonging to the 3300 XL platform. It is engineered for continuous, non-contact measurement of radial shaft vibration, axial position, and differential expansion in rotating machinery operating under API 670 machinery protection requirements. The system ships as a matched set: a 10-inch (254 mm) probe, a 15-foot (4.6 m) integral cable, and a 50-foot (15.2 m) armored extension cable terminated with standard 02/00 connectors — all factory-calibrated as a single traceable assembly.

Within a control loop, this transducer occupies the first measurement node between the rotating shaft and the signal-conditioning proximitor. Its output — a DC voltage proportional to the air gap between probe tip and target — feeds directly into Bently Nevada 3500 series monitor cards, where the signal is processed for alarm, danger, and relay-trip logic. The accuracy of every downstream protection decision depends on the linearity and thermal stability of this transducer assembly. A degraded or counterfeit probe introduces systematic offset errors that no software compensation can fully correct.

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Technical Parameters

Hardware Logical Analysis

The 3300 XL 8 mm probe operates on the eddy-current principle: a high-frequency oscillator (typically 1.0 MHz carrier) drives a coil wound at the probe tip. When a conductive target enters the electromagnetic field, eddy currents are induced on the target surface, loading the coil and reducing its Q-factor. The proximitor demodulates this impedance change into a DC voltage output that is linear with gap distance across the calibrated range of 0–200 mil.

EMC Design: The coaxial cable geometry — with the shield acting as the return conductor — provides inherent common-mode rejection. The 3300 XL platform specifies a characteristic cable impedance of 95 Ω ± 5 Ω, matched to the proximitor input stage to suppress reflections at high-frequency components of the vibration spectrum. The armored extension cable adds a second mechanical and electromagnetic shield layer, reducing susceptibility to variable-frequency drive (VFD) switching noise, which commonly appears in the 2–20 kHz band in motor-driven compressor trains.

Thermal Compensation: The probe coil is wound on a thermally stable ceramic bobbin. The 3300 XL calibration curve accounts for the temperature coefficient of the coil inductance, maintaining scale factor accuracy within ±1% across the full −35 °C to +121 °C probe operating range. This is critical in steam turbine bearing housings where metal temperatures can cycle significantly during startup and shutdown transients.

Matched-System Calibration: The probe, extension cable, and proximitor are calibrated as a matched set against a target of known conductivity (AISI 4140 steel). The calibration data is encoded in the proximitor. Substituting any single component without recalibration introduces a scale factor error that propagates directly into vibration amplitude readings — a risk that is eliminated when the complete 330104-10-15-50-02-00 assembly is deployed as a unit.

Mechanical Robustness: The 316 stainless-steel probe housing is rated for continuous immersion in lubricating oil and withstands the mechanical shock loads encountered during turbine trip events. The integral cable strain relief is designed to prevent coil deformation under the cable tension forces typical of field routing through conduit.

System Integration Benefits

• Direct 3500 Monitor Compatibility: The −200 mV/mil scale factor and −24 VDC supply requirement are native to all Bently Nevada 3500 series monitor input cards, eliminating any signal conditioning adapter or scaling configuration at the monitor level.
• API 670 Compliance Out of the Box: The assembly meets API 670 4th Edition requirements for proximity transducer systems used in machinery protection, satisfying the standard’s specifications for sensitivity, linearity, and temperature performance without additional field verification steps.
• Deterministic Frequency Response: The DC-to-10 kHz (−3 dB) bandwidth captures all vibration components relevant to rotating machinery protection, including 1× and 2× running speed harmonics for machines operating up to 600,000 RPM equivalent frequency content, and sub-synchronous instability modes in fluid-film bearing machines.
• Diagnostic Transparency via Gap Voltage: The DC gap voltage output provides a continuous, real-time indicator of probe-to-shaft clearance. Operators can trend this value to detect shaft centerline migration, bearing wear, and thermal growth — diagnostic data that is invisible to contact-type sensors.
• Zero Mechanical Wear: Non-contact operation eliminates probe wear as a failure mode. The transducer does not load the shaft mechanically, preserving rotor dynamic behavior and removing the need for periodic probe replacement driven by contact fatigue.
• Plug-and-Play Replacement: The 330104 series maintains dimensional and electrical backward compatibility with earlier 3300 series probes, allowing direct field replacement without re-drilling bearing housings or rewiring monitor racks in most installations.
• Hazardous Area Suitability: When paired with the appropriate Bently Nevada barrier or Zener barrier, the system can be deployed in Zone 1/Zone 2 (ATEX) and Division 1/Division 2 (NEC) classified areas, covering the majority of hydrocarbon processing plant environments.
• Reduced Commissioning Time: Factory-matched calibration means the system is ready for installation verification testing immediately upon receipt. Field calibration is limited to confirming gap voltage at the installed air gap — a procedure that takes minutes rather than hours.

Quality Assurance & Global Logistics

Every 330104-10-15-50-02-00 unit supplied by siemensplc.com is sourced through verified industrial supply channels and undergoes a structured incoming inspection protocol before dispatch. Physical inspection covers label integrity, serial number traceability, connector condition, cable jacket continuity, and probe tip surface condition. Units that do not pass inspection are quarantined and not offered for sale.

Shipments originate from our warehouse in Xiamen, China. Xiamen is a designated free-trade port with direct access to major international freight carriers including DHL Express, FedEx International Priority, UPS Worldwide Expedited, and SF International. For in-stock units, typical dispatch is within 1–2 business days of order confirmation. Door-to-door transit times are 3–5 business days to most destinations in Southeast Asia, the Middle East, and Europe; 5–7 business days to North America and South America.

Export documentation — commercial invoice, packing list, certificate of origin, and HS code declaration (HS 9031.80) — is prepared in compliance with Chinese customs regulations and the import requirements of the destination country. For projects requiring a Certificate of Conformance or third-party inspection report, please specify at the time of inquiry. All units ship with a 12-month warranty covering manufacturing defects under normal operating conditions.

Contact Information

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