Bently Nevada 3300101-00-32-10-02-05 Proximity Probe – 3300 XL Series

Bently Nevada 3300101-00-32-10-02-05 — 8mm Eddy-Current Proximity Probe for Continuous Shaft Monitoring in Rotating Machinery

The Bently Nevada 3300101-00-32-10-02-05 is a 2.0-metre cable, 8mm eddy-current proximity probe from the 3300 XL Series, engineered for non-contact, continuous measurement of radial shaft vibration, axial position, and eccentricity in turbomachinery and critical rotating equipment. Operating on the eddy-current induction principle, the probe generates a high-frequency oscillating magnetic field at its tip; when a conductive target surface enters the sensing field, induced eddy currents attenuate the field amplitude, and the Proximitor sensor converts this attenuation into a proportional DC voltage output. The result is a linear, gap-dependent signal with a nominal scale factor of 7.87 V/mm (200 mV/mil), directly compatible with Bently Nevada 3300 XL monitor systems without field recalibration.

Within a machinery protection architecture, this probe occupies the first link in the measurement chain: it converts mechanical displacement into an electrical signal that feeds the Proximitor oscillator-demodulator, which in turn drives the 3300 XL monitor’s alarm and trip logic. The 2.0-metre integral cable (suffix -00-32) accommodates installations where the Proximitor sensor must be mounted at a distance from the bearing housing — a common requirement in high-temperature turbine pedestals where electronics cannot be co-located with the probe tip. The metric thread body (suffix -02-05) with MIL-C-5015-style connector ensures mechanical compatibility with standard probe holders and armored extension cables across the 3300 XL ecosystem.

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Technical Parameters

Hardware Logical Analysis

The 3300101-00-32-10-02-05 probe body is constructed with a ferrite-core coil assembly encapsulated in a hermetically sealed stainless steel housing. The coil is driven by the companion Proximitor sensor (typically the 330180-X1-CN for 8mm probes) at an oscillation frequency in the range of 1.0–1.5 MHz. This frequency band is selected to optimize the skin-depth penetration into AISI 4140 steel targets, ensuring that the eddy-current field is confined to the target surface layer and is not influenced by sub-surface material variations — a critical factor for consistent scale factor accuracy across different shaft surface finishes.

The integral 2.0-metre cable uses a coaxial construction with a low-loss dielectric to preserve signal integrity at the operating frequency. Cable capacitance is tightly controlled to ±5% of nominal, because any deviation shifts the resonant frequency of the probe-cable-Proximitor system and introduces a scale factor error. The -00-32 cable length designation is factory-matched to the Proximitor’s tuning range; substituting a non-matched cable length without re-tuning the Proximitor will produce a measurable scale factor offset, which is why Bently Nevada specifies probe, cable, and Proximitor as a matched set.

EMC performance is achieved through the coaxial cable shield, which is grounded at the Proximitor end only (single-point grounding). This topology prevents ground-loop currents from flowing through the shield and coupling noise into the signal conductor — a design discipline that becomes critical in environments with variable-frequency drives, large motor starters, or high-current bus bars in proximity to the cable routing. The stainless steel probe body provides additional shielding of the coil assembly against radiated electric fields, and the MIL-C-5015 connector’s metal shell maintains shield continuity at the junction point.

The probe tip geometry — a flat-faced 8mm diameter sensing surface — produces a sensing field diameter approximately 2× the probe diameter (roughly 16 mm effective field diameter). This means the target shaft must present a flat, smooth surface of at least 16 mm width in the measurement zone to avoid edge effects that would introduce non-linearity at the extremes of the linear range. For installations on shafts with keyways or surface discontinuities, the probe must be angularly positioned to avoid these features within the ±30° arc centered on the measurement axis.

System Integration Benefits

• Direct monitor compatibility without recalibration: The 3300101-00-32-10-02-05 is factory-calibrated as a matched set with the 3300 XL Proximitor sensor. When installed as a matched set, the system scale factor is guaranteed to 7.87 V/mm ±0.5%, eliminating the need for field calibration and reducing commissioning time.
• Deterministic alarm response: The probe’s linear output range (-1 VDC to -21 VDC) maps directly to the 3300 XL monitor’s analog input range, enabling the monitor to resolve shaft displacement changes as small as 2.5 µm (0.1 mil) — sufficient resolution for early-warning alarm setpoints well below API 670 danger thresholds.
• API 670 compliance for machinery protection: The probe meets API 670 5th Edition requirements for radial vibration and axial position measurement, making it directly applicable to turbomachinery protection systems without additional qualification testing.
• Wide operating temperature envelope: The -35°C to +177°C tip temperature rating covers the full range of bearing housing temperatures encountered in steam turbines, gas turbines, and high-speed compressors, including transient thermal excursions during startup and shutdown.
• Non-contact measurement eliminates wear: Because the probe never contacts the shaft, there is no mechanical wear, no lubrication requirement, and no measurement drift due to probe tip erosion — a significant advantage over contact-type displacement sensors in continuous-duty applications.
• Diagnostic transparency via DC gap voltage: The static DC gap voltage output provides a continuous, real-time indication of probe-to-shaft gap. Operators can monitor gap voltage at the Proximitor output to detect probe mounting looseness, shaft centerline migration, or bearing wear without interrupting machine operation.
• Compatibility with ADRE data acquisition: The probe’s output is directly compatible with Bently Nevada ADRE 408 DSP Signal Analyzer for transient data capture during startup, shutdown, and resonance testing — enabling full rotor dynamic characterization without additional signal conditioning.
• Standardized spare parts inventory: The 3300 XL 8mm probe is the most widely deployed proximity probe in the Bently Nevada installed base. Stocking this model covers the majority of radial vibration measurement points across mixed turbomachinery fleets, reducing spare parts SKU count and inventory carrying cost.

Quality Assurance & Global Logistics

Every Bently Nevada 3300101-00-32-10-02-05 unit supplied by siemensplc.com is sourced from authorized distribution channels or verified surplus inventory with full traceability documentation. Prior to shipment, each probe undergoes a physical inspection protocol covering connector pin integrity, cable jacket condition, tip surface condition, and label legibility. Units with original manufacturer packaging and factory calibration documentation are prioritized for critical-application orders.

Our warehouse is located in Xiamen, China — a major international logistics hub with direct air freight connections to Singapore, Dubai, Frankfurt, Los Angeles, and Tokyo. Standard export packaging uses anti-static foam inserts and moisture-barrier bags to protect the probe coil assembly and connector contacts during transit. For urgent requirements, DHL Express and FedEx International Priority services from Xiamen typically achieve 2–4 business day delivery to most destinations in Southeast Asia, the Middle East, and Europe.

All shipments are accompanied by a commercial invoice, packing list, and certificate of origin. For customers requiring additional documentation — such as material test reports, RoHS declarations, or third-party inspection certificates — these can be arranged at the time of order. The 12-month warranty covers manufacturing defects and is supported by our technical team, who can assist with installation verification, gap setting procedures, and Proximitor tuning guidance.

Contact Information

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