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

Bently Nevada 330103-00-05-05-02-00 — Eddy-Current Proximity Probe for Rotating Machinery Protection

The 330103-00-05-05-02-00 is an 8 mm eddy-current proximity probe belonging to Bently Nevada’s 3300 XL Proximity Transducer System. It performs non-contact, continuous measurement of shaft radial vibration, axial position (thrust), and differential expansion in turbomachinery and other rotating equipment. The probe operates as the sensing element in a three-component transducer chain — probe, extension cable, and Proximitor® oscillator-demodulator — and delivers a DC-coupled analog voltage output that is directly proportional to the gap between the probe tip and the conductive target surface.

In a machinery protection architecture, this probe feeds real-time displacement data to a monitoring rack (such as the Bently Nevada 3500 system), where the signal is processed against alarm and trip setpoints defined per API 670. The output is simultaneously available for condition monitoring platforms such as System 1, enabling trend analysis, orbit plots, and Bode diagrams without additional signal conditioning hardware.

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Technical Parameters

Hardware Logical Analysis

The 330103-00-05-05-02-00 operates on the principle of high-frequency eddy-current induction. The Proximitor® driver energizes the probe coil at a carrier frequency in the range of 1.0 MHz to 1.5 MHz. When the probe tip approaches a conductive target, eddy currents are induced on the target surface, loading the LC tank circuit within the probe and reducing its oscillation amplitude. The Proximitor® demodulates this amplitude change into a DC voltage output with a nominal scale factor of 7.87 V/mm.

EMC and Shielding Architecture: The integral armored cable uses a double-layer coaxial construction — an inner conductor for signal, a braided shield for return current, and an outer stainless-steel armor for mechanical and electromagnetic protection. This construction suppresses common-mode interference from adjacent power cables, variable-frequency drives (VFDs), and high-current bus bars that are typical in turbine hall environments. The shield is grounded at the Proximitor® driver chassis, forming a single-point ground that prevents ground-loop currents from corrupting the low-level DC output.

Thermal Stability: The probe coil is wound on a ceramic bobbin with a low thermal coefficient of inductance. Over the rated operating range of −35 °C to +121 °C, the scale factor drift is held within the ±1% linearity specification without active temperature compensation. This is significant in steam turbine bearing pedestals where ambient temperatures can exceed 80 °C during steady-state operation.

Mechanical Robustness: The probe body is machined from 316 stainless steel, providing resistance to the sulfur-bearing lubricating oils, steam condensate, and cleaning solvents encountered in turbine and compressor environments. The M10 × 1.0 thread allows precise axial positioning with a standard locknut, and the thread pitch provides 1.0 mm of travel per full rotation — enabling fine gap adjustment during commissioning without specialized tooling.

Reverse-Polarity and Overvoltage Protection: The integral coaxial connector incorporates a reverse-polarity keying feature that prevents incorrect mating with non-3300 XL extension cables. The Proximitor® driver includes internal clamping circuitry that protects the probe coil from transient overvoltages generated during cable disconnection under live conditions — a common maintenance scenario in continuous-process plants.

System Integration Benefits

• Direct 3300 XL Ecosystem Compatibility: The 330103-00-05-05-02-00 is fully interchangeable with all 3300 XL Proximitor® drivers (3300/16, 3300/20, 3300/25) and extension cables without recalibration. Replacement in an existing installation requires only gap re-verification, not a full system recalibration, reducing planned maintenance downtime from hours to minutes.
• 3500 Rack Integration: When paired with a 3500/42M or 3500/40M I/O module, the probe signal is processed by the 3500 rack’s internal DSP for alarm, danger, and OK relay outputs. The rack simultaneously streams time-waveform and spectral data to System 1 over Ethernet, enabling continuous online condition monitoring without additional data acquisition hardware.
• API 670 Alarm and Trip Setpoint Accuracy: The ±1% linearity specification ensures that alarm setpoints (typically 125 µm pp / 5 mil pp) and danger setpoints (typically 250 µm pp / 10 mil pp) are enforced with sufficient accuracy to meet API 670 Table 1 performance requirements. Loose linearity in a proximity probe directly translates to uncertainty in trip setpoints, which can result in either undetected bearing failures or nuisance shutdowns.
• Wide Bandwidth for Multi-Frequency Diagnostics: The DC-to-10,000 Hz frequency response captures the full diagnostic spectrum in a single channel: sub-synchronous instabilities (oil whirl/whip at 0.3–0.5×), synchronous 1× and 2× vibration, and high-frequency gear mesh or blade-pass events. This eliminates the need for separate high-frequency accelerometers on bearing housings for most turbomachinery diagnostic applications.
• Hazardous Area Deployment Without Additional Barriers: FM/CSA/ATEX/IECEx intrinsically safe ratings allow direct installation in Zone 1 / Division 1 classified areas when used with a certified IS Proximitor® driver. This removes the cost and complexity of installing Zener barriers or galvanic isolators in the signal loop, simplifying the safety instrumented system (SIS) architecture.
• Orbit Plot and Shaft Centerline Analysis: Two probes mounted at 90° (X–Y configuration) on a bearing journal provide the orthogonal displacement signals required for orbit plot generation. The matched scale factors of 3300 XL probes ensure that the orbit is geometrically accurate without per-channel gain correction in the monitoring software.
• Axial Position (Thrust) Measurement: The probe’s DC response (0 Hz lower frequency limit) makes it equally suitable for static axial position measurement. In a thrust monitoring application, the probe output directly represents the rotor’s axial displacement from a reference datum, enabling early detection of thrust bearing wear before catastrophic failure.
• Diagnostic Transparency via System 1: The analog output of the 330103-00-05-05-02-00 is compatible with Bently Nevada System 1 software’s automated diagnostic modules, including Alert Advisor and Machine Library templates. These modules correlate vibration vectors with process variables (load, speed, temperature) to distinguish mechanical faults from process-induced vibration changes, reducing false alarm rates and improving maintenance decision quality.

Quality Assurance & Global Logistics

Every 330103-00-05-05-02-00 unit supplied by siemensplc.com is sourced through verified channels with documented supply-chain traceability. The following quality controls are applied prior to shipment:

• Authenticity Verification: Label typography, date codes, holographic markings, and packaging materials are cross-referenced against Bently Nevada OEM standards. Units that do not pass authenticity screening are quarantined and not offered for sale.
• Dimensional and Visual Inspection: Probe tip geometry, M10 thread condition, connector integrity, and cable armor continuity are inspected against OEM dimensional drawings.
• Electrical Continuity Check: Coaxial cable center conductor and shield continuity are verified with a calibrated LCR meter. Probe coil impedance is measured and compared against the nominal specification for the 330103 series.
• Secure Export Packaging: Units are individually wrapped in anti-static foam, sealed in moisture-barrier poly bags with desiccant, and packed in double-wall corrugated cartons rated for international air and sea freight. Fragile and orientation labels are applied per IATA/IMDG requirements.
• Certificate of Conformance: A CoC documenting part number, serial number (where available), inspection results, and supply-chain origin is available upon request for regulated industries (nuclear, offshore, aerospace).
• 12-Month Warranty: All units carry a 12-month warranty from the date of shipment against defects in materials and workmanship under normal operating conditions.

Shipments originate from our warehouse in Xiamen, China. Standard international delivery times are 3–7 business days via DHL Express or FedEx International Priority to most destinations in Europe, North America, Southeast Asia, and the Middle East. Expedited same-day dispatch is available for orders confirmed before 14:00 CST. All shipments include a tracking number and commercial invoice with accurate HS code declaration (HS 9031.80) for customs clearance.

Contact Information

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