Bently Nevada 330105-02-12-50-02-00 Proximity Probe – 3300 XL Series

Bently Nevada 330105-02-12-50-02-00: 8 mm Eddy-Current Proximity Probe in the 3300 XL Transducer System

The 330105-02-12-50-02-00 is a factory-configured 8 mm eddy-current proximity probe within Bently Nevada’s 3300 XL transducer family. It functions as the primary sensing element in a three-component measurement chain — probe, extension cable, and driver/oscillator — delivering a DC voltage output that is linearly proportional to the gap between the probe tip and a ferromagnetic target surface. In rotating machinery protection architectures, this probe occupies the first and most critical node of the signal chain: any drift, mechanical damage, or installation error at the probe level propagates directly into vibration alarm and trip logic. Its 8 mm tip geometry, 5.0 m integral armored cable, and 50 Ω system impedance are factory-matched to the 330130 extension cable and 330180/330185 driver, eliminating the need for field calibration when the complete system is deployed as a matched set.

In a radial vibration measurement loop, the probe is mounted in a bracket positioned at 90° or X-Y orientation relative to the shaft centerline. The driver oscillates the probe coil at a fixed carrier frequency, typically in the range of 200 kHz. As the shaft rotates and surface irregularities or dynamic eccentricity alter the air gap, the eddy-current field impedance changes proportionally. The driver demodulates this impedance variation and outputs a DC signal at 7.87 V/mm (200 mV/mil) scale factor. This signal feeds directly into a Bently Nevada 3500 Series monitor or equivalent, where it is compared against alarm and danger setpoints defined per API 670 machinery protection standards.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

The 330105-02-12-50-02-00 is built around a single-coil eddy-current sensing element encapsulated in a hermetically sealed stainless steel housing. The coil is wound on a ferrite core and driven by the external oscillator in the 330180/330185 driver at a carrier frequency that maximizes sensitivity for the 8 mm tip geometry against AISI 4140 steel targets. The 50 Ω coaxial cable architecture is a deliberate impedance-matching design: it suppresses standing wave reflections along the cable run between probe and driver, which would otherwise introduce gain errors at higher vibration frequencies approaching the 10 kHz bandwidth limit.

The hermetic stainless steel housing provides two simultaneous functions. First, it acts as a Faraday shield, attenuating external electromagnetic interference from motor drives, high-current bus bars, and RF sources common in industrial environments. Second, the sealed construction prevents moisture and process fluid ingress, maintaining coil-to-housing insulation resistance above the threshold required for stable DC output. The armored integral cable adds mechanical protection against abrasion and crush loads in confined machinery spaces, while the MIL-C-5015 connector provides a positive-locking, vibration-resistant interface that resists loosening under continuous machinery vibration.

The probe’s linear range of 0.25 mm to 2.54 mm is defined by the region where the eddy-current field depth of penetration into the target surface produces a monotonic, near-linear impedance response. Outside this range, the relationship between gap and output voltage becomes nonlinear, which is why API 670 mandates that installation gaps be set at the midpoint of the linear range (nominally 1.0 mm) to preserve symmetric alarm headroom in both the alert and danger directions. The factory calibration of this probe-driver pair ensures that the 7.87 V/mm scale factor is accurate to within ±1% across the full linear range and the full operating temperature envelope, without requiring field adjustment.

System Integration Benefits

• Direct API 670 compliance: The probe-driver-monitor chain meets the machinery protection standard for critical rotating equipment, satisfying insurance and regulatory requirements without additional engineering justification.
• Zero-calibration deployment: Factory-matched probe and driver sets eliminate the need for field calibration rigs, reducing commissioning time from hours to minutes per measurement point.
• Deterministic frequency response to 10 kHz: The flat −3 dB bandwidth covers all subsynchronous, synchronous, and harmonic vibration components relevant to machinery diagnostics, including blade-pass frequencies on compressors with up to 60 blades at 10,000 RPM.
• Plug-in compatibility with 3500 Series monitors: Output voltage range and scale factor are natively recognized by Bently Nevada 3500/22M and 3500/42M monitor cards, requiring only gap voltage verification during commissioning.
• Wide operating temperature range: −35 °C to +177 °C probe body rating covers cryogenic service (LNG compressors) through high-temperature steam turbine bearing housings without derating.
• High EMC immunity: The 50 Ω coaxial architecture and hermetic housing suppress common-mode interference, maintaining signal integrity in environments with variable-frequency drives and high-voltage switchgear in close proximity.
• Non-contact measurement eliminates wear: With no physical contact between probe and shaft, there is no mechanical degradation of the sensing element over time, supporting continuous 24/7 operation across multi-year maintenance intervals.
• Diagnostic transparency via System 1 integration: When connected to a 3500 monitor feeding Bently Nevada System 1 software, the probe’s output contributes to trend data, orbit plots, and spectrum analysis, enabling predictive maintenance decisions based on measured shaft dynamic behavior rather than time-based schedules.

Quality Assurance & Global Logistics

Every 330105-02-12-50-02-00 unit offered through siemensplc.com is sourced from verified supply channels with documented traceability to Bently Nevada’s manufacturing records. Prior to dispatch, each probe undergoes a pre-shipment inspection covering physical housing integrity, connector pin condition, cable armor continuity, and coil resistance measurement. Units that do not meet acceptance criteria are quarantined and not offered for sale.

Packaging follows anti-static and mechanical protection protocols: the probe tip is capped, the cable is coiled to manufacturer-specified bend radius limits, and the assembly is packed in foam-lined cartons with desiccant to prevent moisture ingress during transit. Original manufacturer labeling, batch codes, and any available calibration documentation are preserved and shipped with the unit.

Logistics operations are managed from Xiamen, China, with access to DHL Express, FedEx International Priority, and UPS Worldwide Express services. Standard international transit times are 3–5 business days to major industrial hubs in Europe, North America, Southeast Asia, and the Middle East. Customs documentation, including commercial invoices, packing lists, and HS code declarations, is prepared accurately to minimize clearance delays. For time-critical plant shutdowns or emergency replacements, same-day dispatch is available for in-stock units when orders are confirmed before 14:00 CST.

All units are covered by a 12-month warranty against manufacturing defects and functional failure under normal operating conditions. Warranty claims are processed with a target response time of 1 business day, and replacement units are dispatched from Xiamen stock where available.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
© 2026 siemensplc.com. All rights reserved.