Bently Nevada 330103-00-13-10-02-05 Proximity Probe – 3300 XL Series

Bently Nevada 330103-00-13-10-02-05: 8mm Eddy Current Proximity Probe for Critical Rotating Machinery Protection

The 330103-00-13-10-02-05 is an 8mm eddy current proximity probe manufactured by Bently Nevada (a Baker Hughes company), designed as the primary sensing element within the 3300 XL Series non-contact measurement platform. This probe delivers continuous, non-contact measurement of shaft radial vibration, axial position, and differential expansion on turbines, compressors, pumps, and motors operating in API 670-governed machinery protection systems. The integral 5-metre (16.4 ft) armored cable eliminates field-assembly variables and preserves factory-calibrated system sensitivity from probe tip to driver input.

In a control loop context, this probe functions as the transducer stage of a three-component eddy current chain: probe → extension cable → oscillator-demodulator driver. The probe coil, embedded in the stainless steel tip, generates a high-frequency electromagnetic field (typically 1 MHz carrier). When a conductive target (shaft) enters the field, eddy currents are induced on the target surface, loading the coil and shifting its impedance. The 3300 XL driver converts this impedance change into a calibrated DC voltage output (–2 VDC to –18 VDC), which feeds directly into Bently Nevada 3500 Series monitoring racks or third-party DCS/PLC analog input cards. The result is a deterministic, low-latency signal path with no mechanical contact, no wear, and no influence on rotor dynamics.

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Technical Parameters

Hardware Logical Analysis

The 330103-00-13-10-02-05 probe is engineered around a single-coil Colpitts oscillator topology embedded in the probe body. The coil geometry is precision-wound to achieve a resonant frequency of approximately 1 MHz, which is the carrier frequency modulated by target proximity. Several hardware design decisions distinguish this probe from generic eddy current sensors:

Controlled-Impedance Coaxial Architecture: The integral 5-metre cable is manufactured as a controlled-impedance coaxial assembly matched to the 3300 XL driver’s input impedance. This eliminates the sensitivity drift that occurs when field-assembled cables introduce uncontrolled capacitance or inductance into the RF signal path. The part number suffix -05 encodes the 5-metre cable length, ensuring the driver’s internal compensation tables are correctly applied without manual recalibration.

EMC Shielding and Armor: The cable jacket combines a braided shield with a stainless steel armor layer. The shield provides continuous 360° coverage against radiated electromagnetic interference from variable-frequency drives, high-current bus bars, and adjacent instrumentation cables — common noise sources in turbine hall and compressor station environments. The armor layer provides mechanical protection against abrasion, rodent damage, and incidental impact during installation and maintenance cycles.

Thermal Stability of Sensitivity: The probe coil former and potting compound are selected for low thermal coefficient of expansion. Over the operating range of –35°C to +177°C, sensitivity variation is held within ±1% of nominal (200 mV/mil), which is critical for axial position measurements where a 0.1 mm error in gap reading can trigger a false trip or mask a genuine thrust bearing failure.

Target Material Compensation: The 3300 XL system is factory-calibrated against AISI 4140 steel targets. The probe’s coil Q-factor and driver gain are matched to this material. When installed on shafts of differing alloy composition (e.g., 17-4 PH stainless, Inconel 718), the driver’s material compensation tables must be applied — a process documented in Bently Nevada Application Note 44 and supported by the probe’s stable coil characteristics.

Redundancy Arbitration Compatibility: In dual-probe redundant configurations (common on API 670 critical machinery), two 330103-series probes are mounted 90° apart in the same bearing plane. The 3500 Series monitor performs vector summation of the two orthogonal signals to compute orbit plots and 1X/2X vibration vectors. The probe’s tight sensitivity tolerance (±2% of nominal) is a prerequisite for accurate orbit reconstruction — a tolerance that generic replacement probes frequently cannot meet.

System Integration Benefits

• Zero-wear signal acquisition: Non-contact measurement eliminates probe-to-shaft contact, removing any possibility of probe-induced rotor excitation or mechanical wear over multi-year continuous operation.
• DC-to-10 kHz bandwidth: The flat frequency response from DC captures slow-roll runout and static position simultaneously with high-frequency vibration events up to the 10th harmonic of a 60,000 RPM machine — a single probe covers both position and dynamic vibration channels.
• Direct 3500 rack compatibility: The –2 to –18 VDC output is natively accepted by Bently Nevada 3500/40M, 3500/42M, and 3500/45 monitor modules without signal conditioning, reducing BOM complexity and eliminating additional analog input cards.
• API 670 drop-in replacement: The probe meets API 670 Fifth Edition transducer performance requirements, allowing direct substitution in existing installations without system recertification or sensitivity recalibration of the monitoring rack.
• Deterministic latency: The analog signal path from probe coil to driver output introduces less than 100 µs of group delay across the full bandwidth, ensuring that the monitoring system’s trip response time is governed by the rack’s processing cycle, not the transducer chain.
• Diagnostic transparency: The probe’s output voltage at any gap distance is predictable from the published sensitivity curve, enabling field engineers to verify probe health with a simple gap measurement and voltmeter — no proprietary diagnostic tools required.
• High-temperature bearing pedestal deployment: The 177°C upper temperature limit covers the majority of steam turbine bearing pedestal environments without requiring the higher-cost 330104 high-temperature variant, reducing procurement cost on standard installations.
• Integral cable eliminates field calibration errors: Factory-matched probe-cable assemblies remove the most common source of 3300 XL system sensitivity error — incorrect extension cable length selection — which in field-assembled systems can shift system sensitivity by up to 8% per metre of cable length deviation.

Quality Assurance & Global Logistics

Every 330103-00-13-10-02-05 unit supplied through siemensplc.com is sourced from verified industrial automation supply channels with full traceability to Bently Nevada’s manufacturing and quality management system. Pre-shipment inspection covers visual integrity of the probe tip and connector, dimensional verification of the cable length, and continuity and insulation resistance testing of the coaxial assembly. Original manufacturer packaging is preserved where available, and traceability documentation — including batch records and inspection reports — is available upon request for critical plant installations.

Logistics operations are based in Xiamen, China, a major international port city with direct access to DHL Express, FedEx International Priority, and UPS Worldwide Express services. Standard export documentation (commercial invoice, packing list, certificate of origin) is prepared for every shipment. For orders requiring ATEX/IECEx certification documentation or material test reports, these are coordinated at the time of order confirmation. Typical dispatch time for in-stock units is 1–3 business days from payment confirmation. Bulk project quantities and standing purchase orders are accommodated with scheduled release agreements.

All units are covered by a 12-month warranty from the date of shipment against manufacturing defects. Warranty claims are processed with a target response time of 48 hours, and replacement units are dispatched via express courier to minimize plant downtime.

Contact Information

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