Bently Nevada 330103-00-21-10-02-00 Proximity Probe – 3300 XL

Bently Nevada 330103-00-21-10-02-00: Non-Contact Shaft Measurement in Rotating Machinery Protection Systems

The Bently Nevada 330103-00-21-10-02-00 is an 8 mm eddy-current proximity probe engineered for continuous, non-contact measurement of radial shaft vibration, axial position, and differential expansion in critical rotating machinery. It operates as the sensing element within the 3300 XL 8mm Proximity Transducer System — a three-component architecture comprising the probe, an extension cable, and a Proximitor® sensor (driver/oscillator). This transducer system is the de facto standard for API 670-compliant machinery protection across turbines, centrifugal compressors, pumps, and large electric motors in oil & gas, power generation, and petrochemical facilities worldwide.

Unlike piezoelectric accelerometers that measure surface acceleration, the eddy-current probe responds to the absolute gap distance between its tip and the conductive target shaft. This makes it uniquely suited for low-speed machinery, DC-coupled vibration measurements, and static position monitoring — capabilities that acceleration-based sensors cannot provide. The probe’s output is a continuous DC voltage proportional to the gap, with a nominal scale factor of 7.87 V/mm (200 mV/mil), enabling direct integration into 3500 Series monitors, DCS analog input cards, and safety instrumented systems (SIS).

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Technical Parameters

Hardware Logical Analysis

The 330103-00-21-10-02-00 operates on the principle of electromagnetic induction. The Proximitor® sensor drives a high-frequency oscillating current (typically 500 kHz – 2 MHz) through the probe coil. When the probe tip approaches a conductive target, eddy currents are induced on the target surface, loading the oscillator circuit and reducing its amplitude. The Proximitor® sensor’s demodulation circuitry converts this amplitude change into a proportional DC voltage output — the gap signal.

EMC Design: The probe body is constructed from 316 stainless steel with a PEEK (polyether ether ketone) tip housing, providing inherent shielding against electrostatic interference. The coaxial cable geometry — center conductor, dielectric, and braided shield — maintains consistent characteristic impedance along the 5 m integral cable, suppressing common-mode noise pickup from adjacent power cables and variable-frequency drives (VFDs). The PFA fluoropolymer jacket (code 02) resists hydrocarbon solvents, steam, and aggressive process fluids encountered in refinery environments.

Calibration Traceability: Each probe is factory-calibrated against an AISI 4140 steel target on a precision gap-setting fixture traceable to NIST standards. The scale factor tolerance is ±1% of nominal (7.87 V/mm), ensuring that monitor alarm and danger setpoints derived from the scale factor remain within API 670 accuracy requirements without field recalibration.

Thermal Stability: The probe coil is wound with a temperature-compensated formulation that maintains scale factor within ±0.5% across the full operating temperature range of −35 °C to +177 °C. This is critical for installations near turbine exhaust casings or compressor discharge flanges where ambient temperatures fluctuate significantly during load transients.

Cable System Impedance Matching: The 330103 probe is designed to operate with a total cable system length of 5 m (probe) + 5 m extension = 10 m, or 5 m probe + 10 m extension = 15 m. Deviating from these matched lengths alters the cable capacitance presented to the Proximitor® oscillator, shifting the resonant frequency and degrading scale factor accuracy. The MIL-C-5015 connector provides a hermetically sealed, vibration-resistant interface rated for 500 mating cycles.

System Integration Benefits

• DC-Coupled Measurement Architecture: The probe’s DC-to-10,000 Hz frequency response enables simultaneous measurement of static shaft position (gap) and dynamic vibration on a single channel — eliminating the need for separate position transducers on thrust bearing assemblies.
• Direct 3500 Series Monitor Compatibility: The probe integrates plug-and-play with Bently Nevada 3500/40M, 3500/42M, and 3500/45 monitor modules. No signal conditioning adapters are required; the Proximitor® sensor output connects directly to the monitor’s BNC input.
• API 670 Fifth Edition Compliance: The transducer system meets all API 670 requirements for proximity transducer systems, including scale factor tolerance, frequency response, and temperature range — simplifying machinery protection system documentation for EPC contractors and end users.
• Hazardous Area Certification: FM, CSA, ATEX, and IECEx approvals cover Zone 0/1 (gas) and Zone 20/21 (dust) installations, enabling deployment in offshore platforms, LNG terminals, and chemical plant environments without additional barrier hardware in most configurations.
• System 1 Software Integration: The probe’s output, when routed through a 3500 monitor, feeds directly into Bently Nevada System 1 condition monitoring software for trend analysis, orbit plot generation, and predictive maintenance scheduling — providing full diagnostic transparency from sensor to software.
• DCS/PLC Analog Input Compatibility: Via a 4–20 mA signal conditioner, the probe’s −1 to −21 VDC output maps to standard analog input ranges accepted by Siemens S7-300/400/1500, ABB 800xA, Honeywell Experion, and Emerson DeltaV DCS platforms.
• Orbit Plot Capability: Two probes mounted 90° apart on the same bearing journal provide X-Y shaft position data for orbit plot analysis — a diagnostic technique that identifies rotor imbalance, misalignment, oil whirl, and rub conditions with high specificity.
• Minimal Maintenance Footprint: The non-contact sensing principle eliminates mechanical wear. With no moving parts and a sealed construction, the probe requires no periodic calibration in the field beyond the initial installation gap setting — reducing maintenance labor costs over the asset lifecycle.

Quality Assurance & Global Logistics

Every Bently Nevada 330103-00-21-10-02-00 unit supplied by siemensplc.com is sourced through verified supply channels and subjected to incoming inspection before dispatch. Authenticity verification includes examination of probe body markings, date codes, MIL-C-5015 connector condition, and cable jacket integrity. Electrical verification covers open-circuit coil resistance and insulation resistance between the coil and probe body — parameters that confirm coil winding integrity and absence of moisture ingress.

Units are packaged in anti-static foam-lined cartons with desiccant packs to prevent humidity-related degradation during transit. Export documentation — including commercial invoice, packing list, certificate of conformance, and HS code declaration (HS 9031.80) — is prepared for each shipment to facilitate customs clearance in the destination country.

Logistics operations are based in Xiamen, China, with access to DHL Express, FedEx International Priority, and UPS Worldwide Express services. Standard transit times are 3–5 business days to Europe and North America, 2–4 business days to Southeast Asia and the Middle East. For urgent plant shutdowns or unplanned outages, same-day dispatch is available for orders confirmed before 14:00 CST.

All units carry a 12-month warranty from the date of shipment, covering manufacturing defects and verified electrical parameter deviations. Warranty claims are processed with a target response time of 48 hours.

Contact Information

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