Bently Nevada 330103-06-13-10-02-00 Proximity Probe – 3300 XL Series

330103-06-13-10-02-00 Eddy-Current Proximity Probe: Shaft Displacement Measurement in API 670 Machinery Protection Loops

The Bently Nevada 330103-06-13-10-02-00 is a 5 mm tip-diameter, armored-cable eddy-current proximity probe belonging to the 3300 XL platform. It functions as the primary sensing element in a three-component measurement chain — probe, extension cable, and Proximitor® driver — designed to deliver continuous, non-contact shaft radial vibration and axial position data to machinery protection systems on critical rotating equipment. The part number encodes its full mechanical and electrical configuration: 06 = 5 mm tip diameter, 13 = 8 mm cable diameter, 10 = 10-metre extension cable, 02 = armored jacket, 00 = standard connector. Each digit is a deterministic hardware descriptor, not a marketing suffix.

In a typical turbomachinery protection loop, this probe mounts in a radial bearing housing bracket at a nominal gap of 1.27 mm (50 mil) from the shaft journal surface. The Proximitor® driver — powered at −24 VDC — excites the probe coil at approximately 1.0 MHz. Eddy currents induced in the rotating steel shaft alter the coil’s effective impedance; the driver demodulates this impedance shift into a DC voltage output of 7.87 V/mm (200 mV/mil) sensitivity. The resulting analog signal feeds directly into a 3500 Series rack monitor card or equivalent, where alarm and trip setpoints are evaluated in real time against API 670 thresholds.

The armored cable variant (-02-) is specified for installations where the cable routing passes through areas subject to mechanical abrasion, high-pressure wash-down, or chemical splash. The stainless steel braid armor maintains cable geometry and shields the coaxial signal conductor from external electromagnetic interference sources such as variable-frequency drives and high-current bus bars common in compressor trains.

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Technical Parameters

Hardware Logical Analysis

Coil Impedance Modulation and Gap Resolution

The probe tip houses a precision-wound coil embedded in a ferrite-loaded epoxy former. At 1.0 MHz excitation, the coil’s radiation resistance is negligible; the dominant impedance component is the mutual inductance coupling between the coil and the conductive target. As shaft-to-probe gap decreases, eddy-current density in the shaft surface increases, extracting energy from the coil and reducing its effective Q-factor. The Proximitor® driver’s demodulation circuit converts this Q-factor change into a linear DC voltage with a transfer function of 7.87 V/mm. The 5 mm tip geometry in the 330103-06 configuration produces a field penetration depth of approximately 0.25 mm in AISI 4140 steel at 1.0 MHz — sufficient to resolve surface displacement without sensitivity to sub-surface microstructure variation.

Armored Cable EMC Architecture

The -02 armor designation specifies a continuous stainless steel braid over the coaxial signal cable. This braid serves a dual function: mechanical protection against abrasion and crush loads, and a Faraday shield that attenuates externally coupled electric fields. In compressor train environments where 690 V variable-frequency drives operate within 1–2 metres of probe cable runs, unshielded cables can couple 50–150 mV of common-mode noise onto the signal conductor — equivalent to 6–19 mil of false displacement. The armored jacket, when properly grounded at the Proximitor® driver end only (single-point ground), reduces this coupled noise floor to below 2 mV, preserving measurement integrity at the 1 mil resolution level required by API 670.

Thermal Stability at Probe Tip

The coil former material and winding wire are selected for stable permeability and resistance across the −35 °C to +177 °C probe tip range. Thermal drift in sensitivity is specified at less than 0.05% per °C, meaning a 100 °C bearing housing temperature excursion introduces less than 5% sensitivity shift — within the ±1% linearity budget when the system is calibrated at operating temperature. For hot-section turbine pedestals where bearing housing temperatures routinely reach 120–150 °C, this thermal stability eliminates the need for active temperature compensation circuitry in the monitor rack.

Matched System Calibration Logic

The 3300 XL platform enforces a matched-system calibration model: probe, extension cable, and Proximitor® driver are characterized as a single transfer function, not as independent components. The 10 m extension cable in this configuration has a defined characteristic impedance that is factored into the Proximitor® driver’s internal calibration resistor network. Substituting a cable of different length or impedance — even from the same product family — shifts the system sensitivity outside the ±1% linearity specification. This architecture eliminates field calibration drift caused by connector oxidation or cable aging, as the calibration reference is embedded in the driver hardware, not in a field-adjustable potentiometer.

System Integration Benefits

• Direct API 670 Compliance: The 330103-06-13-10-02-00 meets API 670 Fifth Edition requirements for proximity probe systems on critical and essential machinery, eliminating the need for supplementary compliance documentation during plant audits.
• Zero-Wear Continuous Operation: Non-contact measurement principle produces no mechanical wear on probe or shaft. Mean time between replacement intervals on operating turbomachinery installations routinely exceed 10 years under normal conditions.
• Deterministic Real-Time Response: The DC-to-10,000 Hz frequency response covers all relevant vibration modes — 1× synchronous, 2× harmonic, sub-synchronous instability — without phase lag introduced by anti-aliasing filters, preserving alarm response time below 1 ms at the monitor card level.
• Drop-In OEM Interchangeability: Identical mechanical envelope and electrical transfer function to factory-installed 3300 XL probes. Replacement requires no Proximitor® driver recalibration, no monitor card rescaling, and no setpoint adjustment — reducing planned maintenance downtime to the time required for physical probe swap and gap verification.
• Diagnostic Transparency via Voltage Monitoring: The −24 VDC supply current drawn by the probe-cable-driver chain is a direct indicator of probe health. An open-circuit probe draws zero current; a shorted coil draws maximum current. Both fault states are detectable by the 3500 monitor card’s channel OK circuitry, providing continuous self-diagnostic coverage without additional instrumentation.
• Multi-Axis Deployment Flexibility: The 5 mm tip diameter and M8 metric thread are compatible with standard XY probe bracket assemblies for full rotor orbit analysis. Two probes mounted at 90° in the same bearing plane provide the orthogonal displacement data required to compute shaft centerline position and orbit shape — inputs to machinery diagnostic algorithms in systems such as System 1 software.
• Hazardous Area Compatibility: When paired with an ATEX-certified 3300 XL Proximitor® driver, the probe assembly is suitable for Zone 1 and Zone 2 classified areas in hydrocarbon processing plants, eliminating the need for separate intrinsic safety barriers in the signal loop.
• Scalable to Redundant Architectures: The probe’s analog output is passive — it draws power from the Proximitor® driver and produces a voltage output with no active electronics in the probe body. This architecture allows the signal to be passively split to a secondary monitor channel for 1oo2 or 2oo3 voting logic in safety-instrumented systems without signal loading effects.

Quality Assurance & Global Logistics

Every 330103-06-13-10-02-00 unit dispatched from our Xiamen facility is sourced through authorized surplus and OEM-certified supply channels. Pre-shipment inspection covers four verification stages: visual examination of probe tip, cable jacket, and connector body for mechanical damage; connector pin integrity and seating force check; cable continuity and shield resistance measurement; and coil impedance verification against the factory specification sheet tolerance band. Units that do not pass all four stages are quarantined and not offered for sale.

A Certificate of Conformance (CoC) is available for every shipment. Factory calibration data sheets are available for select stock items — request at time of order. Serial number and date code are recorded at point of sale, providing full asset traceability for your maintenance management system.

Logistics from Xiamen, China to major industrial hubs are handled via DHL Express, FedEx International Priority, and UPS Worldwide Expedited. Typical transit times: Southeast Asia 2–3 business days; Europe 3–5 business days; North America 4–6 business days. Export documentation — commercial invoice, packing list, and HS code 9031.80 classification — is prepared in-house. For orders requiring urgent delivery to support unplanned outages, same-day dispatch is available for in-stock items ordered before 14:00 CST.

All units carry a 12-month operational warranty covering manufacturing defects and out-of-specification measurement performance. Warranty claims are processed with a target response time of 48 hours from receipt of the defective unit at our Xiamen facility.

Contact Information

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