Bently Nevada 330103-00-03-50-02-00 Proximity Probe – 3300 XL Series

BENTLY NEVADA 330103-00-03-50-02-00 — 8mm Eddy-Current Proximity Probe in the 3300 XL Transducer System

The 330103-00-03-50-02-00 is an 8 mm eddy-current proximity probe manufactured by Bently Nevada as part of the 3300 XL Proximity Transducer System. It performs non-contact, continuous measurement of shaft radial vibration, axial position displacement, and differential thermal expansion on critical rotating machinery. The probe operates on the eddy-current induction principle: a high-frequency oscillator (typically 1.0 MHz) drives an electromagnetic field from the probe tip coil; as a conductive target shaft approaches, induced eddy currents load the oscillator circuit, producing a DC-proportional output voltage at the driver/oscillator module. This architecture delivers a flat frequency response from DC to 10,000 Hz (–3 dB), making it equally suited to slow-roll runout acquisition at 1–2 RPM and high-frequency sub-synchronous instability detection at 10 kHz.

The integral cable length of this variant is 3.0 m, paired with a 5.0 m extension cable (total system cable length: 8 m). Total cable length is a calibration-critical parameter: the driver/oscillator is factory-trimmed to a specific cable capacitance, and mismatching cable length shifts the scale factor from the nominal 7.87 V/mm (200 mV/mil), introducing systematic measurement error that cannot be corrected in software alone. Procurement engineers must verify the existing system cable length before specifying a replacement probe.

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Technical Parameters

Hardware Logical Analysis

The 3300 XL system architecture separates the sensing element (probe), signal transmission (extension cable), and signal conditioning (driver/oscillator) into three discrete, matched components. This partitioned design has two principal engineering advantages: first, the probe body — the component most exposed to heat, vibration, and chemical contamination — can be replaced without disturbing the driver electronics or the rack-level monitor card; second, the matched-set calibration approach allows the driver to compensate for cable capacitance variation across the full –35 °C to +177 °C temperature range, maintaining scale factor accuracy within ±1% over the operating envelope.

EMC and Shielding Architecture: The armored coaxial cable construction provides continuous 360° electrostatic shielding from probe tip to driver input. The shield is grounded at the driver end only (single-point ground), preventing ground-loop currents that would appear as low-frequency noise on the vibration signal. In high-EMI environments — such as variable-frequency drive (VFD) motor rooms or switchgear enclosures — this single-point shield topology typically achieves 40–60 dB of common-mode rejection at frequencies below 1 kHz, which is the dominant interference band in industrial power systems.

Oscillator Frequency and Target Penetration Depth: The 3300 XL driver operates at approximately 1.0 MHz carrier frequency. At this frequency, the eddy-current skin depth in AISI 4140 steel is approximately 0.08 mm, meaning the induced currents are confined to a thin surface layer. This shallow penetration makes the measurement insensitive to shaft core microstructure variations but highly sensitive to surface finish and residual magnetism. API 670 Section 5.3 specifies a maximum shaft surface finish of 0.8 µm Ra and a residual magnetism limit of 0.5 mT to ensure measurement integrity — parameters that should be verified during commissioning and after any shaft repair or grinding operation.

Thermal Stability: The probe coil is wound on a ceramic bobbin with a low coefficient of thermal expansion (CTE ≈ 6 × 10⁻⁶/°C), matched to the 316 stainless steel housing (CTE ≈ 16 × 10⁻⁶/°C) through a mechanical compliance layer. This construction limits thermally induced dimensional change of the coil geometry to less than 2 µm across the full –35 °C to +177 °C range, preventing thermal drift from being misinterpreted as shaft position change. In hot-section turbine bearing housings where probe body temperatures routinely reach 150–170 °C, this thermal stability is a primary selection criterion.

Intrinsic Safety Barrier Compatibility: The ATEX Zone 1/2 and FM Division 1/2 approvals are achieved through the driver/oscillator’s intrinsic safety design, which limits maximum output energy to below the ignition threshold of Group IIC gases (hydrogen, acetylene). The probe itself is a passive inductive element; its approval status is contingent on pairing with an approved driver. Substituting a non-approved driver invalidates the hazardous-area certification of the entire transducer system.

System Integration Benefits

• Direct 3500 Rack Compatibility: The 3300 XL probe and driver output is the native input signal for Bently Nevada 3500/40M and 3500/42M monitor cards. No signal conditioning adapters or impedance matching networks are required, preserving the full DC–10 kHz measurement bandwidth at the rack input.
• Backward Compatibility with 3300 Series Infrastructure: Existing 3300 series conduit runs, junction boxes, and terminal blocks are dimensionally and electrically compatible with 3300 XL components, reducing retrofit installation labor by eliminating cable re-pulls in most applications.
• Deterministic DC Response for Axial Position Monitoring: The DC-coupled output allows simultaneous measurement of both dynamic vibration (AC component) and static shaft position (DC component) from a single probe. This eliminates the need for a separate position transducer in axial thrust monitoring applications, reducing channel count and rack card requirements.
• API 670 Compliance for EPC Contracts: Specifying the 330103-00-03-50-02-00 satisfies the transducer requirements of API 670 (5th Edition) without additional engineering justification, streamlining vendor documentation packages for refinery, LNG, and power-generation EPC projects.
• Traceable Calibration Documentation: Each probe ships with a calibration certificate traceable to NIST (USA) or PTB (Germany) standards, satisfying ISO 17025 audit requirements and supporting plant reliability management systems (RMS) that require documented instrument traceability.
• Diagnostic Transparency via Gap Voltage Monitoring: The –2 VDC to –18 VDC output range provides a direct, measurable indicator of probe-to-shaft gap. Maintenance engineers can verify correct probe installation gap (typically –10 VDC ± 0.5 V at nominal 1.0 mm gap) with a standard digital multimeter, without requiring specialized test equipment or rack card access.
• Wide Temperature Operating Range Reduces Cooling Requirements: The +177 °C probe body rating eliminates the need for cooling air purge systems in most turbine bearing housing installations, reducing auxiliary system complexity and associated maintenance burden.
• Hazardous Area Installation Without Additional Barriers: In most ATEX Zone 1/2 and FM Division 1/2 configurations, the intrinsically safe driver/oscillator eliminates the need for external Zener barriers or galvanic isolators in the signal loop, reducing panel space requirements and potential failure points in the safety circuit.

Quality Assurance & Global Logistics

Every 330103-00-03-50-02-00 unit supplied by siemensplc.com is sourced through verified industrial distribution channels with documented chain of custody. Pre-shipment inspection covers dimensional verification of probe tip geometry, coil impedance measurement at 1 MHz to confirm oscillator loading characteristics, cable continuity and shield integrity testing, and review of accompanying calibration certificate and country-of-origin documentation. Units exhibiting any evidence of rework, re-labeling, or non-original packaging are rejected and not offered for sale.

Logistics operations are managed from Xiamen, China, a major southeastern port city with direct access to DHL Express, FedEx International Priority, UPS Worldwide Express, and multiple ocean freight consolidators. Standard export documentation — commercial invoice, packing list, certificate of origin, and HS code declaration (HS 9031.80) — is prepared for every shipment. For time-critical plant shutdowns, same-day dispatch on orders confirmed before 14:00 CST is available for in-stock units. Typical transit times: 2–3 business days to Southeast Asia, 3–5 business days to Europe and the Middle East, 4–6 business days to North America. All shipments are fully insured and tracked door-to-door.

A 12-month warranty covers manufacturing defects under normal operating conditions. Warranty claims are processed with a target response time of 1 business day; replacement units are dispatched from Xiamen stock where available, minimizing plant downtime exposure.

Contact Information

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