Bently Nevada 330101-00-25-10-02-00 Proximity Transducer – 3300 XL Series

Bently Nevada 330101-00-25-10-02-00 — 3300 XL 8mm Proximity Transducer in Rotating Machinery Protection Loops

The 330101-00-25-10-02-00 is a non-contact eddy-current proximity transducer manufactured by Bently Nevada under the 3300 XL 8mm platform. It is designed to deliver continuous, high-resolution shaft displacement and radial vibration data to API 670-compliant machinery protection systems. The probe operates on the eddy-current induction principle: a high-frequency oscillator (typically 1.0 MHz) drives an LC tank circuit through the integral coaxial cable; as the conductive target surface approaches the probe tip, eddy currents induced in the target load the tank circuit, attenuating oscillation amplitude in direct proportion to the air gap. The proximitor/oscillator-demodulator converts this amplitude modulation into a DC-biased voltage output with a calibrated sensitivity of 7.87 V/mm (200 mV/mil), providing a linear, phase-accurate signal from DC to 10,000 Hz.

Within a control loop, this transducer occupies the sensing layer of a three-element chain: probe → extension cable → proximitor. The 25 cm integral cable of the 330101-00-25-10-02-00 is matched to the 3300 XL proximitor’s input impedance. Any substitution with a non-XL cable or a legacy 3300-series driver will shift the tank circuit resonant frequency, introducing a systematic sensitivity error that cannot be corrected by software scaling alone. This electrical interdependency is a deliberate design constraint that enforces system-level calibration traceability under API 670 Annex D.

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Technical Parameters

Hardware Logical Analysis

Eddy-Current Sensing Architecture: The probe tip houses a planar coil wound on a ferrite core, encapsulated in a PEEK (polyether ether ketone) housing. PEEK’s dielectric constant remains stable across the full –35°C to +177°C operating envelope, preventing thermally induced drift in the coil’s self-inductance. The ferrite core concentrates the magnetic flux field perpendicular to the target surface, maximizing the rate of change of mutual inductance with gap distance and thereby maximizing sensitivity linearity.

EMC Design: The integral coaxial cable provides a continuous shield from the probe body to the proximitor input, suppressing common-mode noise injection from adjacent power cables and variable-frequency drives (VFDs). The shield is grounded at the proximitor end only (single-point grounding), eliminating ground-loop currents that would appear as low-frequency noise on the displacement signal. In installations where VFD switching frequencies (typically 2–16 kHz) overlap with the probe’s measurement bandwidth, the 10,000 Hz flat response ensures the signal chain does not attenuate legitimate high-frequency vibration components while the coaxial shield rejects the VFD-sourced interference.

Thermal Compensation: The 3300 XL platform incorporates a temperature-compensated oscillator circuit within the proximitor. The probe’s coil resistance has a positive temperature coefficient of approximately +0.004 Ω/°C; the proximitor’s compensation network applies an equal and opposite correction, maintaining sensitivity within ±1% across the full operating temperature range without field recalibration.

Mechanical Robustness: The M10 × 1.0 thread pitch is finer than the M10 × 1.5 general-purpose standard, providing greater axial positioning resolution during gap setting (0.127 mm per degree of rotation vs. 0.167 mm for coarse pitch). The stainless-steel probe body resists corrosion in oil-mist and steam environments typical of turbine bearing pedestals. The IP67 rating confirms the probe withstands temporary immersion to 1 m depth, relevant during water-wash cleaning of compressor casings.

System Integration Benefits

• API 670 Full Compliance: The 330101-00-25-10-02-00 meets all performance requirements of API 670 5th Edition for radial vibration and axial position transducer systems, including sensitivity tolerance, frequency response, and temperature range — eliminating the need for supplementary compliance testing at the plant level.
• Deterministic Signal Latency: The analog output architecture introduces zero computational latency between shaft displacement and signal output. The proximitor’s demodulated DC voltage is available to the monitor card within the propagation delay of the cable (approximately 5 ns/m), ensuring that the 3500 Series monitor’s trip logic operates on real-time shaft position data without buffering or sampling jitter.
• Plug-and-Play 3300 XL Interchangeability: The probe is fully interchangeable with all 3300 XL 8mm probes in the field. Replacement requires only gap re-verification; no recalibration of the proximitor or monitor is required, reducing planned maintenance downtime to under 30 minutes per measurement point.
• Dual-Function Measurement: A single 330101-00-25-10-02-00 probe can simultaneously provide radial vibration (AC component, 0–10,000 Hz) and average shaft centerline position (DC component) to the monitor. This eliminates the need for separate position sensors on machines where both parameters are required by API 670.
• Wide Target Material Compatibility: While calibrated for AISI 4140 steel, the probe can be used with other ferrous alloys by applying a documented target material correction factor. This flexibility supports installations on machines with chrome-moly or stainless-steel shafts without requiring a custom-calibrated probe in most cases.
• Hazardous Area Deployment: The intrinsically safe (Ex ia) variant of this probe, used with an approved Zener barrier or galvanic isolator, is certified for Zone 0/1/2 (ATEX) and Zone 0/1/2/20/21/22 (IECEx) installations, covering gas turbine enclosures, offshore platform machinery spaces, and petrochemical compressor trains.
• Diagnostic Transparency: The –2 VDC to –18 VDC output range provides built-in open-circuit and short-circuit fault detection. A gap voltage outside the –2 to –18 VDC window indicates a wiring fault, probe failure, or excessive gap — conditions that the 3500 Series monitor can flag as a Not-OK (NOK) state without requiring additional diagnostic hardware.
• Long-Term Calibration Stability: The PEEK-encapsulated coil assembly is hermetically sealed against oil, steam, and process gas ingress. Field experience across the 3300 XL platform documents sensitivity drift of less than ±0.5% over a 5-year continuous service interval in turbine bearing environments, supporting extended calibration intervals under IEC 61511 functional safety management plans.

Quality Assurance & Global Logistics

Every 330101-00-25-10-02-00 unit dispatched from our Xiamen, China facility is sourced from authorized Bently Nevada distribution channels and verified surplus inventories with full traceability documentation. Pre-shipment verification includes visual inspection of the probe tip, cable jacket, and connector seating; sensitivity verification against Bently Nevada factory calibration data (7.87 V/mm ± 0.25%); serialization and lot-code cross-check; and counterfeit-risk screening using reference dimensional and marking standards.

Units are shipped in original manufacturer packaging where available. All shipments use anti-static inner wrap and moisture-barrier outer packaging with desiccant inserts, conforming to IPC/JEDEC J-STD-033 handling guidelines for sensitive electronic components. International shipments are dispatched via DHL Express, FedEx International Priority, or UPS Worldwide Expedited, with typical transit times of 3–5 business days to North America and Europe, 2–4 business days to Southeast Asia, and 4–7 business days to the Middle East and South America. DDP (Delivered Duty Paid) terms are available for select regions, eliminating customs clearance complexity for the buyer. All orders include a tracking number and commercial invoice with HS code 8543.70 for customs classification.

Contact Information

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