Bently Nevada 330103-00-06-90-02-00 Proximity Probe – 3300 XL Series

Bently Nevada 330103-00-06-90-02-00 — Non-Contact Shaft Displacement Measurement in Rotating Machinery Protection

The 330103-00-06-90-02-00 is an 8 mm eddy-current proximity probe within Bently Nevada’s 3300 XL Proximity Transducer System. Its primary function in a machinery protection control loop is to convert the physical gap between the probe tip and a conductive target surface into a proportional DC voltage signal, which downstream monitoring hardware — typically a 3500 Series rack — processes for radial vibration amplitude, shaft centerline position, axial thrust displacement, and eccentricity. The probe operates on the eddy-current induction principle: a high-frequency oscillator (nominally 1.0 MHz for 8 mm probes) drives a coil embedded in the probe tip, generating an alternating magnetic field. When a conductive target enters this field, eddy currents are induced on the target surface, loading the oscillator circuit and reducing its output amplitude in direct proportion to the gap distance. This gap-to-voltage transfer function is linear across the calibrated range — typically 0.25 mm to 2.25 mm for standard 8 mm probes — with a nominal sensitivity of −7.87 V/mm (−200 mV/mil) when paired with the correct 3300 XL driver.

In a turbomachinery protection architecture, this probe is installed in a radial bearing housing at 90° X–Y orientation pairs to capture full orbital shaft motion, or axially against a thrust collar to monitor rotor position relative to the thrust bearing. The signal chain runs from the probe through a matched-length extension cable (typically 330130 series) to a 3300 XL proximitor/driver, which provides the bias voltage supply and outputs the conditioned DC signal to the 3500 monitoring rack. The entire chain — probe, cable, driver — must be calibrated as a matched set to maintain the ±0.5% linearity specification across the operating gap range.

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Technical Parameters

Hardware Logical Analysis

The 330103-00-06-90-02-00 probe body is machined from 316 stainless steel, providing corrosion resistance in oil-mist and process-fluid environments typical of bearing housings. The probe tip encapsulates the sensing coil in a thermoplastic compound rated to 177°C continuous, isolating the coil from mechanical shock and chemical ingress without introducing dielectric losses that would shift the oscillator frequency.

The integral armored cable — 5 ft (1.524 m) — uses a coaxial construction with a low-loss dielectric and a braided shield terminated to the probe body ground. This construction suppresses capacitive coupling from adjacent power cables and limits the cable’s contribution to the overall system capacitance, which directly affects the oscillator’s loaded Q-factor and therefore the linearity of the gap-to-voltage transfer function. The cable length is a calibrated parameter: substituting a non-matched cable length without recalibration shifts the sensitivity coefficient and introduces a static offset error that cannot be corrected by zero adjustment alone.

EMC performance is achieved through a combination of the coaxial cable shield, the grounded stainless-steel probe body, and the differential signal architecture within the 3300 XL driver. The driver’s internal circuitry rejects common-mode noise on the coaxial line, providing a measured common-mode rejection ratio (CMRR) sufficient to maintain signal integrity in environments with high-frequency switching noise from variable-frequency drives (VFDs) operating in the 2–20 kHz carrier frequency range. The probe’s 1.0 MHz oscillator frequency is well above the VFD harmonic spectrum, preventing direct interference with the sensing signal.

The 3/8-24 UNF-2A thread allows precise axial positioning of the probe tip relative to the target surface using a locknut arrangement. The thread pitch (1/24 inch ≈ 1.058 mm per revolution) provides fine positional control during installation gap-setting, enabling the technician to set the initial gap to within ±0.05 mm of the nominal 1.0 mm installation gap without specialized tooling beyond a calibrated gap meter or oscilloscope monitoring the bias voltage output.

System Integration Benefits

• Deterministic signal latency: The eddy-current measurement principle operates at the oscillator frequency (~1.0 MHz), delivering a gap measurement update rate that is orders of magnitude faster than the 3500 rack’s sampling interval (typically 1 ms per channel). This ensures the monitoring system never misses a transient vibration event caused by a blade-pass excitation or a sudden rotor rub.
• Zero mechanical wear on the measurement path: Non-contact operation eliminates the tribological degradation that affects contact-type displacement sensors. In continuous-duty applications running 8,760 hours per year, this translates directly to zero sensor-induced maintenance intervals over the probe’s service life.
• Matched-set calibration traceability: Each 330103-00-06-90-02-00 probe is factory-calibrated as part of a matched probe–cable–driver set. The calibration data is traceable to NIST standards, satisfying the documentation requirements of ISO 10816 and API 670 machinery protection specifications.
• Direct API 670 compliance: The 3300 XL system, including this probe, is designed to meet the requirements of API Standard 670 (Machinery Protection Systems), the governing specification for turbomachinery protection in oil & gas and petrochemical facilities. Procurement engineers can reference this compliance to satisfy project specifications without additional qualification testing.
• Plug-compatible replacement within 3300 XL architecture: The 330103-00-06-90-02-00 is dimensionally and electrically identical to other 330103 series probes of the same cable length. Replacement in the field requires only gap re-verification — no driver reconfiguration, no rack parameter changes — minimizing mean time to repair (MTTR) during unplanned outages.
• Diagnostic transparency via bias voltage monitoring: The −24 VDC supply and the probe’s output bias voltage (nominally −10 VDC at 1.0 mm gap) are continuously monitored by the 3500 rack’s OK/Not-OK circuit. A probe open-circuit, short-circuit, or out-of-range gap condition drives the output outside the −2 VDC to −18 VDC OK window, triggering an immediate channel NOT OK alarm without requiring a separate diagnostic scan cycle.
• Compatibility with 3500 Series rack I/O modules: The probe’s output signal is directly compatible with the 3500/40M, 3500/42M, 3500/44M, and 3500/45 monitoring modules. No signal conditioning adapter is required, preserving the full dynamic range of the 3500 rack’s 16-bit ADC and maintaining the system’s overall measurement uncertainty below ±1% of full scale.
• Thermal stability across bearing housing temperature gradients: The probe body’s 316 SS construction and the thermoplastic tip compound maintain dimensional stability from −30°C to +177°C. In steam turbine bearing housings where ambient temperatures can reach 120–150°C, this prevents thermal expansion of the probe body from introducing a false gap shift that would appear as a slow drift in the shaft centerline position trend.

Quality Assurance & Global Logistics

Every 330103-00-06-90-02-00 unit supplied by siemensplc.com is sourced through verified industrial supply channels. Units are inspected upon receipt for packaging integrity, label authenticity, and connector condition. Original Bently Nevada factory documentation — including calibration certificates and certificates of conformance — is available upon request and provided as standard for orders destined for regulated facilities operating under ISO 55001 asset management or API 670 compliance frameworks.

Shipments originate from our warehouse in Xiamen, China (福建省厦门市). Xiamen’s port infrastructure and proximity to major international freight hubs — including Xiamen Gaoqi International Airport and Xiamen Port — enables same-day dispatch for in-stock orders placed before 14:00 CST. Standard international express freight (DHL, FedEx, UPS) delivers to most destinations in Asia-Pacific within 3–5 business days, to Europe within 5–8 business days, and to North America within 5–7 business days. Sea freight consolidation is available for bulk orders. All shipments include full tracking, commercial invoice, packing list, and country-of-origin documentation. Dangerous goods classification does not apply to this product; no special transport restrictions apply.

Anti-static foam-lined packaging protects the probe tip and connector during transit. Each unit is individually bagged in moisture-barrier film before boxing. For orders of 5 units or more, wooden crating with shock-absorbing foam inserts is available upon request at no additional charge.

Contact Information

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