Bently Nevada 330103-00-03-90-12-05 Proximity Probe – 3300 XL Series

Bently Nevada 330103-00-03-90-12-05 — 8mm Eddy-Current Proximity Probe in the 3300 XL Machinery Protection Architecture

The 330103-00-03-90-12-05 is a factory-calibrated, 8 mm tip-diameter eddy-current proximity probe manufactured by Bently Nevada as part of the 3300 XL transducer series. It is designed for continuous, non-contact measurement of radial shaft vibration, axial shaft position, and differential expansion in rotating machinery operating under API 670 Fifth Edition requirements. The assembly integrates a 5-metre (16.4 ft) armored extension cable terminated with a 3-pin MIL-C-5015 connector, forming a complete probe-cable sub-assembly ready for direct connection to a 3300 XL proximitor/driver module.

Unlike general-purpose inductive sensors, this probe is factory-characterized against AISI 4140 steel targets at a nominal bias of −24 VDC, yielding a certified scale factor of 7.87 V/mm (200 mV/mil) across a linear measurement range of 0.25 mm to 2.26 mm (10–89 mil). The −3 dB frequency response extends from DC to 10,000 Hz, covering all sub-synchronous, synchronous, and super-synchronous vibration components relevant to turbomachinery diagnostics.

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

Technical Parameters

Hardware Logical Analysis

The 330103-00-03-90-12-05 operates on the Lenz-law eddy-current principle: a high-frequency oscillator within the paired proximitor module drives an alternating magnetic field through the probe coil. When a conductive target enters the field, eddy currents are induced on the target surface, loading the oscillator circuit and producing a proportional change in output voltage. The probe itself contains no active electronics — it is a passive inductive element — which eliminates failure modes associated with embedded amplifiers in high-temperature bearing pedestals.

Coil geometry and gap linearity: The 8 mm tip diameter is optimized for a gap-to-diameter ratio that maintains linearity within ±0.5% across the full 0.25–2.26 mm range. Smaller-diameter probes (5 mm) exhibit tighter linear ranges and are more sensitive to target surface finish variation; the 8 mm geometry provides a practical balance between spatial resolution and tolerance to minor shaft surface irregularities such as chrome plating or journal grinding marks.

EMC design and cable shielding: The -90 armored jacket designation specifies a continuous stainless-steel braid shield bonded to the MIL-C-5015 connector shell at the probe end and to the proximitor input connector at the driver end. This single-point grounding topology suppresses common-mode noise injection from variable-frequency drives, high-voltage bus bars, and adjacent instrumentation cables — a critical requirement in turbine halls where conducted and radiated EMI levels routinely exceed IEC 61000-4-3 Class A limits. The PTFE dielectric maintains stable capacitance per unit length (nominally 95 pF/m) across the full operating temperature range, preventing scale-factor drift caused by cable capacitance variation.

Thermal stability: The probe coil former is wound on a ceramic mandrel with a low coefficient of thermal expansion. This construction limits coil geometry change to less than 0.1% across the −35 °C to +177 °C operating envelope, ensuring that scale factor remains within the ±1% factory tolerance without field recalibration — a requirement explicitly stated in API 670 Section 5.3 for permanently installed probes.

Target material sensitivity: The probe is factory-characterized for AISI 4140 steel (relative permeability μr ≈ 100, electrical conductivity σ ≈ 4.0 × 10⁶ S/m). For non-standard target materials — 17-4 PH stainless steel, Inconel 718, or titanium alloys — the effective scale factor deviates by 3–18% depending on alloy composition. Bently Nevada publishes material correction tables; field recalibration using a calibrated target fixture is required when the target material differs from the factory standard.

System Integration Benefits

• Zero-recalibration drop-in replacement: The 330103-00-03-90-12-05 is pin-compatible and scale-factor-matched to all 3300 XL proximitor modules (330180, 330130 families), allowing direct substitution in existing API 670 loops without adjusting monitor alarm setpoints or recertifying the measurement chain.
• Deterministic DC-coupled output: The DC-to-10 kHz flat response enables simultaneous measurement of static shaft position (DC component) and dynamic vibration (AC component) from a single transducer, eliminating the need for separate position and vibration sensors on each bearing journal.
• Sub-micron resolution for early fault detection: At 200 mV/mil sensitivity, the system resolves shaft displacement changes of approximately 2.5 µm — sufficient to detect incipient oil-whirl instability (typically manifesting as 0.3–0.48× running speed sub-synchronous orbits with amplitudes of 5–15 µm) before bearing metal contact occurs.
• API 670 loop integrity preservation: Because the probe, extension cable, and proximitor form a matched system characterized as a unit, substituting only the probe (while retaining the original extension cable) maintains the certified scale factor without requiring a full system recalibration — a significant maintenance cost reduction in continuous-process plants.
• High-temperature bearing pedestal compatibility: The 177 °C probe-tip rating covers bearing-pedestal temperatures on steam turbines operating at main-steam conditions up to 600 °C / 250 bar, where bearing metal temperatures at the probe mounting location typically reach 120–160 °C under full-load conditions.
• Hazardous-area adaptability: When paired with a certified IS barrier (e.g., MTL 787+ or P&F KFD2-STC4-Ex1), the standard probe can be deployed in IEC Zone 1 / NEC Class I Division 1 classified areas without requiring an ATEX-certified probe variant, reducing spare-parts inventory complexity.
• Diagnostic transparency via orbit analysis: Two probes mounted at 90° on a single bearing journal feed X-Y displacement data to the 3500 Series monitor, enabling real-time shaft orbit computation. Orbit shape analysis (circular, elliptical, figure-eight) directly identifies fault modes — misalignment, rub, fluid instability — without requiring machine shutdown for physical inspection.
• Long-term trending and predictive maintenance integration: The analog output (−24 VDC nominal bias, ±12 V swing) is directly compatible with DCS analog input cards (4–20 mA via transmitter or direct ±10 V input), OSIsoft PI historians, and GE System 1 / Bently Nevada System 1 Evolution software for long-term vibration trending and alarm rationalization.

Quality Assurance & Global Logistics

Every 330103-00-03-90-12-05 unit dispatched from our Xiamen, China facility undergoes a structured pre-shipment verification protocol:

• Visual and dimensional inspection against Bently Nevada OEM dimensional drawings — probe tip geometry, cable armor integrity, and connector pin alignment are verified under 10× magnification.
• Insulation resistance test at 500 VDC (≥100 MΩ pass threshold) to confirm cable dielectric integrity after handling and storage.
• Scale-factor verification using a calibrated steel target fixture traceable to NIST standards — output voltage is measured at three gap positions (0.5 mm, 1.0 mm, 1.5 mm) and compared against the factory certificate of conformance (±1% tolerance).
• Serialization cross-check against manufacturer traceability records where batch documentation is available.
• Anti-static, humidity-controlled packaging with desiccant and humidity indicator card — critical for long-term storage of precision inductive sensors in tropical or maritime climates.

Logistics from Xiamen port to major industrial hubs: DHL Express / FedEx International Priority typically achieves 3–5 business days to Europe, 4–6 days to North America, and 2–3 days to Southeast Asia. Air freight consolidation and sea freight options are available for bulk orders. All shipments include commercial invoice, packing list, and certificate of conformance. Export classification: HS 9031.80 (measuring instruments). No ITAR or EAR99 restrictions apply to this product.

Contact Information

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