Bently Nevada 330908-00-55-05-02-00 Proximity Probe – 3300 XL Series

Bently Nevada 330908-00-55-05-02-00 — 8mm Eddy-Current Proximity Probe in the 3300 XL Measurement Chain

The 330908-00-55-05-02-00 is a factory-configured 8mm eddy-current proximity probe within Bently Nevada’s 3300 XL platform, designed to deliver continuous, non-contact displacement measurement of rotating shafts in machinery protection systems. Operating as the primary sensing element in a three-component signal chain — probe, extension cable, and Proximitor® driver — this unit converts mechanical gap variation into a calibrated DC voltage output with a nominal sensitivity of 200 mV/mil (7.87 V/mm). The integral 5-meter armored cable eliminates the need for a separate extension cable in standard installation geometries, reducing connector count and associated signal integrity risks. Procurement engineers specifying replacement or greenfield sensors for Bently Nevada 3300 or 3500 series monitoring racks will find this part number a direct, recalibration-free substitution for any existing 8mm 3300 XL probe assembly.

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Technical Parameters

Hardware Logical Analysis

The 330908-00-55-05-02-00 operates on the eddy-current induction principle. The probe tip houses a wound coil driven by a high-frequency oscillator (typically 1.0 MHz) located within the paired Proximitor® driver (e.g., 330180 series). This oscillator generates an alternating electromagnetic field that penetrates the conductive target surface. As the shaft-to-probe gap changes, the eddy-current loading on the coil alters the oscillator’s tank circuit impedance, producing a proportional shift in oscillation amplitude. The Proximitor® demodulates this amplitude variation and outputs a DC voltage linearly proportional to gap distance at 200 mV/mil.

EMC Design: The integral cable uses a coaxial construction with a continuous stainless steel armor braid. This dual-layer shielding — inner coaxial shield plus outer mechanical armor — attenuates radiated electromagnetic interference from adjacent VFDs, switchgear, and high-current bus bars common in turbine halls and compressor stations. The shield is grounded at the Proximitor® driver chassis, establishing a single-point ground reference that prevents ground-loop noise from corrupting the low-level oscillator signal.

Thermal Stability: The probe body is rated to 177°C, achieved through the use of high-temperature polyimide coil insulation and a ceramic-filled epoxy potting compound that maintains dimensional stability under thermal cycling. The coil former material has a controlled thermal expansion coefficient matched to the probe housing alloy, preventing gap measurement drift caused by differential thermal expansion at elevated operating temperatures found in hot-section steam turbine installations.

Mechanical Robustness: The probe tip assembly is machined from a non-magnetic stainless alloy to prevent the housing itself from becoming a secondary eddy-current target. Thread engagement length and tip geometry conform to the 3300 XL mechanical interface standard, ensuring consistent installation depth and gap setting repeatability across replacement cycles without requiring re-gapping beyond the standard 1.0 mm (40 mil) initial gap procedure.

Signal Chain Integrity: The -55 cable length code (5.5 m total system cable) is factory-matched to the Proximitor® driver’s internal compensation network. Substituting non-matched cable lengths alters the transmission line impedance seen by the oscillator, shifting the scale factor from the nominal 200 mV/mil. This unit’s factory-matched configuration eliminates that variable, preserving measurement accuracy without field recalibration.

System Integration Benefits

• Zero-Recalibration Replacement: Direct pin-compatible substitution for any 3300 XL 8mm probe in existing monitoring racks — no scale factor adjustment required in the Proximitor® or monitor configuration.
• Deterministic Frequency Response: Flat response from DC to 10,000 Hz (−3 dB) captures all sub-synchronous, synchronous, and super-synchronous vibration components relevant to API 670 alarm and trip logic without signal conditioning artifacts.
• Reduced Connector Failure Points: The 5m integral cable eliminates the probe-to-extension-cable connector junction, which is statistically the highest-failure-rate component in eddy-current probe assemblies exposed to vibration and thermal cycling.
• Wide Dynamic Range: 0.25 mm to 2.25 mm linear range (2.0 mm span) accommodates both radial vibration amplitude measurement and absolute shaft position (thrust, eccentricity) within a single sensor, reducing sensor count per measurement plane.
• API 670 Compliance: Fully compliant with API Standard 670 (5th Edition) for machinery protection systems, satisfying insurance, regulatory, and plant engineering requirements without additional documentation burden.
• Diagnostic Transparency: The −2 VDC to −22 VDC output range provides a measurable voltage at both near-gap and far-gap extremes, enabling technicians to verify probe health and gap setting with a standard DC voltmeter without removing the probe from service.
• Compatibility with 3500 Series Racks: When paired with a 330180-series Proximitor® driver, the probe integrates directly with Bently Nevada 3500/40M, 3500/42M, and 3500/45 monitor modules, preserving existing rack wiring and I/O assignments during system upgrades.
• Harsh Environment Suitability: Stainless armor cable and high-temperature probe body rating make this unit deployable in petrochemical, power generation, and offshore environments where ambient temperature, chemical exposure, and mechanical vibration would degrade standard industrial sensors.

Quality Assurance & Global Logistics

Every 330908-00-55-05-02-00 unit offered through siemensplc.com is sourced as genuine Bently Nevada OEM product. Pre-shipment inspection covers visual examination of the probe tip and cable armor for mechanical damage, connector integrity verification, and cable continuity check from probe tip to termination. Original OEM packaging is preserved where available; units requiring repackaging are accompanied by a written inspection report. A Certificate of Conformance (CoC) is available upon request at no additional charge — specify at time of order for inclusion with shipping documentation.

Our logistics operation is based in Xiamen, China, a major international port city with direct air freight connections to Europe, North America, Southeast Asia, the Middle East, and Oceania. In-stock units are dispatched within 1–3 business days of order confirmation via DHL Express, FedEx International Priority, or UPS Worldwide Expedited, depending on destination and customer preference. Export documentation — commercial invoice, packing list, and HS code declaration (HS 9031.80) — is prepared in-house to minimize customs clearance delays. For time-critical plant shutdowns or emergency replacements, same-day dispatch is available for orders confirmed before 14:00 CST; contact us directly to arrange.

All shipments are covered by a 12-month warranty from the date of dispatch. Warranty claims are handled directly by our technical team without third-party intermediaries, ensuring rapid resolution. Replacement units for valid warranty claims are dispatched within 48 hours of claim approval.

Contact Information

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