Bently Nevada 330103-05-17-10-02-00 Proximity Transducer – 3300 XL Series

330103-05-17-10-02-00 — Eddy-Current Proximity Transducer in Critical Rotating Machinery Protection Loops

The Bently Nevada 330103-05-17-10-02-00 is a non-contact eddy-current proximity transducer belonging to the 3300 XL platform — a three-component measurement chain (probe, extension cable, driver) engineered to API 670 Fifth Edition machinery protection requirements. This specific configuration pairs a 17 mm probe body with a 5 m extension cable, a 10-32 UNF mounting thread, and a standard 02 coaxial connector. The 17 mm body geometry is the defining characteristic: it extends probe tip reach into deep-bore bearing housings where the more common 8 mm or 12 mm variants cannot achieve adequate target proximity. In practice, this makes the 330103-05-17-10-02-00 the preferred selection for heavy-wall turbine bearing pedestals, large-frame centrifugal compressor housings, and hydroelectric generator shaft monitoring installations.

Within the control loop, the transducer occupies the sensing node of a continuous, closed-loop machinery protection architecture. The probe tip generates a high-frequency electromagnetic field (nominally 1 MHz oscillation frequency driven by the matched 3300 XL driver). When a conductive target — typically AISI 4140 or equivalent ferromagnetic alloy — enters the field, eddy currents are induced on the target surface. The resulting impedance change at the probe coil is proportional to the air gap distance between probe tip and shaft surface. The driver demodulates this impedance variation into a DC voltage output: −18 VDC at mid-range gap, with a calibrated sensitivity of 7.87 V/mm (200 mV/mil) across a linear measurement range of 0.25 mm to 2.25 mm. This DC signal feeds directly into Bently Nevada 3500 Series monitors, which apply alarm and danger setpoints and relay protection signals to the plant DCS or turbine control system.

The 5 m extension cable is an integral part of the calibrated system. Total system cable length — probe body plus extension — must match the driver’s calibration range. Substituting a different cable length without recalibrating the driver will introduce sensitivity offset and zero-position error. Engineers specifying replacement units must verify that the 330103-05-17-10-02-00 total cable length matches the existing driver calibration before installation. This unit ships with full OEM documentation to support that verification process.

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Technical Parameters

Hardware Logical Analysis

The 330103-05-17-10-02-00 probe coil assembly is wound on a ferrite core and encapsulated in a stainless-steel housing rated to IP67. The extended 17 mm body geometry is not merely a dimensional variant — it alters the electromagnetic field geometry at the probe tip. A longer probe body increases the depth of the field penetration axis relative to the mounting flange plane, which is mechanically necessary when the bearing housing bore depth exceeds the reach of standard 12 mm probes. The coil inductance is factory-trimmed to match the 3300 XL driver’s oscillator circuit, ensuring that the probe-driver-cable system operates within the calibrated impedance window without field adjustment.

EMC Design: The coaxial cable architecture provides inherent common-mode noise rejection. The outer shield of the extension cable is grounded at the driver end only (single-point grounding), preventing ground-loop currents that would appear as low-frequency noise on the DC output signal. In high-EMI environments — such as variable-frequency drive (VFD) motor rooms or switchgear-adjacent installations — the coaxial shield provides attenuation of radiated interference above 100 kHz, which is well above the 0–10 kHz vibration frequency band of interest. The probe housing itself is non-magnetic stainless steel, which does not distort the eddy-current field and provides mechanical protection against process fluid ingress.

Thermal Stability: The probe coil’s temperature coefficient of inductance is compensated by the driver’s internal temperature correction circuit. Over the probe’s rated operating range of −35°C to +177°C, sensitivity drift is maintained within ±0.5% of nominal — a critical specification for steam turbine bearing housings where ambient temperatures can exceed 150°C during full-load operation.

Cable Impedance Matching: The 5 m extension cable is manufactured to a controlled characteristic impedance specification. Impedance discontinuities along the cable — caused by mechanical damage, improper splicing, or substitution with non-OEM cable — will introduce reflections at the probe-cable junction, degrading the linearity of the output signal. This is a common root cause of unexplained sensitivity errors in field installations. Using the factory-assembled 330103-05-17-10-02-00 as a complete, matched assembly eliminates this failure mode.

System Integration Benefits

• Zero mechanical wear on the measurement path: Non-contact sensing eliminates probe-to-shaft contact, removing the primary wear mechanism present in LVDT and contact-type displacement sensors. Mean time between maintenance interventions is effectively unlimited under normal operating conditions.
• Direct plug-in compatibility with 3500 Series monitors: The DC voltage output (−18 VDC nominal) is natively accepted by Bently Nevada 3500/40M, 3500/42M, and 3500/45 monitor modules without signal conditioning. No intermediate transmitter or converter is required.
• Deterministic signal latency: The eddy-current measurement chain introduces less than 1 ms of signal latency from gap change to DC output change, supporting machinery protection systems that require sub-cycle response times for overspeed and high-vibration trip functions.
• Dual-measurement capability: A single 330103-05-17-10-02-00 probe can simultaneously provide radial vibration (AC component, 0–10 kHz) and shaft centerline position (DC component) data to the monitor, reducing the total sensor count per bearing journal.
• API 670 compliance for insurance and regulatory acceptance: Installations using API 670-compliant components satisfy the machinery protection requirements of IEC 61511 (functional safety), Lloyd’s Register, and major petrochemical plant insurance underwriters without additional engineering justification.
• Diagnostic transparency via gap voltage monitoring: The DC output voltage provides a continuous, real-time indication of probe-to-shaft gap. Technicians can verify correct probe installation gap (typically 1.0–1.5 mm, corresponding to −10 to −14 VDC) using a standard voltmeter without specialized test equipment.
• Interchangeability within the 330103 series: All 330103 series probes share the same 10-32 UNF thread and coaxial connector standard, allowing field replacement without mechanical modification to the bearing housing. The 17 mm body length is the only dimension that differs from the 12 mm variant.
• Compatibility with Bently Nevada System 1 software: When connected to a 3500 Series monitor networked to System 1 condition monitoring software, the 330103-05-17-10-02-00 contributes to automated trend analysis, alarm rationalization, and predictive maintenance workflows without additional configuration.

Quality Assurance & Global Logistics

Every 330103-05-17-10-02-00 unit supplied by siemensplc.com is sourced through verified Bently Nevada (Baker Hughes) authorized distribution channels. Each unit undergoes a structured intake inspection covering serial number authentication, label and marking integrity, connector and cable jacket condition, and physical conformance to OEM dimensional standards. Functional bench verification of output sensitivity is performed on selected units using calibrated reference drivers and gap fixtures traceable to NIST standards.

Traceability documentation — including Certificate of Conformance (CoC), original manufacturer datasheet, and packing records — is compiled for each order and available upon request. This documentation package supports plant maintenance records, insurance audits, and regulatory compliance filings.

Logistics from Xiamen, China: Orders are dispatched from our Xiamen fulfillment hub within 1–2 business days of payment confirmation. International express shipment is handled via DHL Express, FedEx International Priority, and UPS Worldwide Expedited, with typical transit times of 3–5 business days to major industrial hubs in Europe, North America, Southeast Asia, and the Middle East. Export documentation — commercial invoice, packing list, Certificate of Origin, and HS Code 9031.80.90 declaration — is prepared accurately for each shipment to minimize customs clearance delays. Anti-static packaging and moisture-barrier sealing are applied as standard for all electronic sensor shipments.

Contact Information

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