Bently Nevada 330901-00-96-10-02-05 Proximity Probe – 3300 XL Series

Bently Nevada 330901-00-96-10-02-05: 8mm Eddy Current Proximity Transducer in the 3300 XL System Architecture

The Bently Nevada 330901-00-96-10-02-05 is a non-contact eddy current proximity probe belonging to the 3300 XL 8mm Proximity Transducer System. It operates as the primary sensing element in a three-component transducer chain — probe, extension cable, and driver/oscillator — designed to deliver continuous, high-resolution shaft displacement and vibration data in rotating machinery protection systems. With a 96-inch (2,438 mm) integral cable, M10×1 threaded body, and 10-32 coaxial output connector, this probe is configured for installations where moderate cable routing distances are required between the probe tip and the driver module mounted on the monitor rack.

In a machinery protection loop, this probe mounts radially or axially against a rotating shaft target, typically AISI 4140 steel. The driver energizes the probe coil at a fixed carrier frequency, and the resulting eddy current field attenuates as a function of the air gap between probe tip and target surface. The driver converts this impedance change into a DC voltage output with a nominal scale factor of 7.87 V/mm (200 mV/mil), linear across a gap range of 0.25 mm to 2.25 mm (10 to 90 mil). This analog output feeds directly into Bently Nevada 3500 Series monitor rack input cards, where it is processed for vibration amplitude, DC gap, and phase reference measurements.

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Technical Parameters

Hardware Logical Analysis

The 330901-00-96-10-02-05 operates on the principle of electromagnetic induction. The probe coil, embedded in the epoxy-filled tip housing, is driven by the paired 330180 oscillator at a carrier frequency typically in the range of 500 kHz to 2 MHz. When the conductive target enters the probe’s electromagnetic field, eddy currents are induced on the target surface, extracting energy from the coil circuit and reducing its effective impedance. The driver circuit measures this impedance reduction and outputs a proportional negative DC voltage — the closer the target, the more negative the output voltage.

The 8mm tip diameter is a deliberate mechanical and electromagnetic design choice. A larger coil diameter produces a wider, more uniform field distribution compared to 5mm probes, which extends the linear measurement range to 2.0 mm and reduces sensitivity to minor shaft surface irregularities such as machining marks or minor runout. This makes the 8mm probe the preferred selection for large-diameter shafts (typically above 50 mm) where the ratio of probe tip diameter to shaft diameter must remain within defined limits to avoid field curvature errors.

The 96-inch integral cable is a coaxial construction with a characteristic impedance matched to the 330180 driver input. The cable shield is grounded at the driver end only (single-point grounding) to prevent ground loop currents from introducing noise into the measurement signal. The armored outer jacket provides mechanical protection against abrasion and hydrocarbon fluid ingress in turbomachinery environments. The 10-32 coaxial connector at the cable terminus provides a low-resistance, vibration-resistant interface to the extension cable or driver input.

EMC performance is achieved through the coaxial cable geometry, which provides inherent common-mode rejection of externally induced electromagnetic interference. The driver’s demodulation circuit further filters carrier-frequency components, passing only the baseband displacement signal to the monitor rack. This architecture allows the system to maintain measurement integrity in environments with high-frequency switching noise from variable-frequency drives (VFDs) and power conversion equipment commonly found in industrial facilities.

The probe body is machined from 316 stainless steel, providing corrosion resistance in wet gas, steam, and process fluid environments. The tip housing is filled with a high-temperature epoxy compound that maintains dimensional stability across the full operating temperature range of –35°C to +120°C, preventing thermal expansion from shifting the probe tip position relative to the mounting thread reference plane.

System Integration Benefits

• Direct API 670 Compliance: The 330901-00-96-10-02-05 is designed and factory-calibrated to meet API 670 (5th Edition) requirements for machinery protection systems, eliminating the need for field calibration verification on new installations and simplifying third-party audit documentation.
• Deterministic Scale Factor Accuracy: Factory calibration against a certified AISI 4140 steel target guarantees scale factor accuracy within ±1% of the nominal 7.87 V/mm, ensuring that vibration amplitude readings in the monitor rack are traceable to a known reference without site-specific adjustment.
• Broad Frequency Bandwidth: The DC to 10,000 Hz (–3 dB) frequency response captures both low-frequency rotor dynamics (1× and 2× running speed components) and higher-frequency structural resonances, supporting full-spectrum vibration analysis without signal bandwidth limitations at typical turbomachinery operating speeds up to 60,000 RPM.
• Seamless 3500 Rack Integration: The probe’s output characteristics are matched to the input specifications of Bently Nevada 3500 Series monitor cards (3500/40M, 3500/42M, 3500/45), enabling plug-and-play replacement without reconfiguring monitor card input ranges or alarm setpoints.
• DCS and Safety System Compatibility: When paired with a 3500 rack, the 4–20 mA analog output modules provide a standardized process variable signal compatible with DeltaV, Ovation, ABB 800xA, and Honeywell Experion DCS platforms, as well as SIL-rated safety instrumented systems (SIS) for automated shutdown logic.
• Diagnostic Transparency via DC Gap Monitoring: The DC component of the probe output provides a continuous, real-time measurement of the average air gap between probe tip and shaft. This allows maintenance engineers to detect probe mounting loosening, shaft centerline migration due to bearing wear, and thermal growth of the machine casing — all without interrupting machine operation.
• Non-Contact Measurement Eliminates Wear: Unlike contact-type displacement sensors, the eddy current probe has no mechanical interface with the rotating shaft. There is no wear mechanism, no lubrication requirement, and no risk of probe-induced shaft damage during transient events such as high-amplitude vibration during startup or coast-down.
• Long-Term Spare Parts Availability: Bently Nevada (Baker Hughes) maintains extended production runs for the 3300 XL series. Stocking the 330901-00-96-10-02-05 as a critical spare ensures that replacement units are available with known, matched calibration characteristics, avoiding the recalibration overhead associated with substituting alternative probe models.

Quality Assurance & Global Logistics

Every Bently Nevada 330901-00-96-10-02-05 unit supplied by siemensplc.com is sourced from verified distribution channels with full manufacturer documentation. Prior to dispatch, each probe undergoes a structured inspection protocol: visual examination of the tip housing and cable jacket for physical damage, dimensional verification of the M10×1 thread and 10-32 connector, electrical continuity check of the coaxial cable, and cross-reference of the serial number against the accompanying calibration certificate.

Units are shipped from our warehouse in Xiamen, China, a major international logistics hub with direct access to DHL Express, FedEx International Priority, UPS Worldwide Express, and TNT services. Standard in-stock orders are dispatched within 1–3 business days. Export documentation — including commercial invoice, packing list, and certificate of origin — is prepared in compliance with international trade regulations. For customers in the EU, North America, Southeast Asia, and the Middle East, typical transit times range from 3 to 7 business days via express courier.

All units are supplied with a 12-month warranty covering manufacturing defects. In the event of a confirmed defect, siemensplc.com provides replacement or full refund. Customers requiring expedited processing should indicate “URGENT” in their inquiry subject line for priority handling within 4 business hours.

Contact Information

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