Bently Nevada 330103-01-07-50-02-00 Proximity Transducer – 3300 XL Series

Bently Nevada 330103-01-07-50-02-00 — 8 mm Eddy Current Proximity Transducer in the 3300 XL Machinery Protection Platform

The 330103-01-07-50-02-00 is a factory-calibrated, 8 mm diameter eddy current proximity transducer manufactured by Bently Nevada as part of the 3300 XL transducer system. It functions as the primary sensing element for non-contact measurement of radial shaft vibration, axial shaft position, and differential thermal expansion in rotating machinery. The transducer operates on the eddy current principle: a high-frequency oscillator within the matched proximitor drives an electromagnetic field at the probe tip; as a conductive target shaft moves within the linear measurement range, induced eddy currents alter the field impedance, and the proximitor converts this impedance shift into a calibrated DC voltage output proportional to the probe-to-target gap.

This part number encodes a specific configuration: 8 mm probe body, 0.5 m integral cable, standard temperature rating (–35 °C to +177 °C), and a two-wire connector interface compatible with the 3300 XL extension cable family. The complete measurement chain — probe, extension cable, and proximitor — must be used as a factory-matched set to preserve the nominal scale factor of 7.87 V/mm (200 mV/mil). Substituting unmatched components introduces scale factor error that invalidates API 670 protection setpoints.

The 3300 XL platform has been the reference standard for turbomachinery protection in oil and gas, power generation, and petrochemical industries for over three decades. The 330103-01-07-50-02-00 is backward-compatible with existing 3300 XL rack installations and forward-compatible with Bently Nevada 3500 Series monitoring racks, making it a direct replacement for aging transducer assemblies without requiring recalibration of the monitoring system.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

The 330103-01-07-50-02-00 probe tip houses a precision-wound coil embedded in a thermally stable ceramic former. The coil is driven at approximately 1 MHz by the matched proximitor oscillator. At this frequency, the skin depth in AISI 4140 steel is approximately 8 µm, confining eddy current losses to a thin surface layer and making the measurement insensitive to bulk shaft material properties beyond the calibrated target specification. This shallow skin depth also means the transducer responds to surface geometry — runout, scratches, and residual magnetism — rather than subsurface anomalies, which is why API 670 mandates target surface finish and runout verification during commissioning.

The probe body is constructed from 316 stainless steel with a PEEK (polyether ether ketone) tip encapsulant. PEEK maintains dimensional stability from cryogenic temperatures to +250 °C and exhibits a dielectric constant that does not drift significantly with temperature, preserving the coil’s resonant characteristics across the rated operating range. The integral cable uses a coaxial construction with a fluoropolymer (FEP) dielectric, chosen for its low loss tangent at MHz frequencies and resistance to hydrocarbon fluids and steam condensate.

EMC performance is achieved through the coaxial cable shield, which provides a continuous Faraday enclosure from the probe tip to the proximitor input. The shield is grounded at the proximitor end only (single-point grounding) to prevent ground loop currents from modulating the signal. In high-EMI environments — such as variable-frequency drive (VFD) motor rooms or switchgear bays — the –24 VDC supply line should be filtered with a ferrite bead choke at the proximitor power input to attenuate common-mode noise above 100 kHz.

The probe’s linear range of 0.25 mm to 2.26 mm is defined by the region where the output voltage versus gap curve deviates less than ±1% from the nominal scale factor. Outside this range, the relationship becomes nonlinear and the output saturates. Alarm and danger setpoints in the monitoring rack must be configured within this linear window. The standard operating gap of 1.0 mm (40 mil) places the quiescent point at the midpoint of the linear range, providing symmetric headroom for both inward and outward shaft displacement events.

System Integration Benefits

• Deterministic DC output: The –18 VDC to 0 VDC output is a true DC signal with no carrier frequency component, allowing direct connection to any API 670-compliant monitor input without additional signal conditioning or demodulation hardware.
• Zero mechanical contact: The non-contact measurement principle eliminates probe wear, bearing loading, and process contamination risks associated with contact-type displacement sensors, enabling continuous online monitoring across the full machine operating life.
• Broadband frequency coverage (DC–10 kHz): A single transducer captures slow-roll runout at startup (sub-1 Hz), synchronous 1× and 2× vibration at operating speed, and sub-synchronous instabilities such as oil whirl (typically 0.43–0.48× running speed) within a single measurement channel.
• Factory-matched calibration traceability: Each probe, extension cable, and proximitor set is calibrated as a unit against NIST-traceable standards. The calibration certificate documents the actual scale factor, linearity error, and temperature coefficient for the specific serial number combination, supporting plant quality management systems.
• Direct rack compatibility: Output signal format is identical to all generations of Bently Nevada 3300 and 3500 Series monitors. No firmware changes, input card replacements, or setpoint recalculations are required when replacing a worn transducer with a new 330103-01-07-50-02-00 of the same calibration set configuration.
• Diagnostic transparency: A failed or open-circuit probe drives the proximitor output to a voltage outside the normal operating range (typically more negative than –18 VDC or less negative than 0 VDC), which the 3500 monitor interprets as a Not OK (NOK) condition and activates the channel’s fault relay — providing automatic sensor health indication without additional diagnostic hardware.
• Hazardous area certification: ATEX certification (consult the specific zone rating on the product datasheet) permits installation in Zone 1 and Zone 2 classified areas without additional intrinsic safety barriers when used with the approved proximitor model, simplifying installation in upstream oil and gas facilities.
• Thermal expansion measurement capability: When installed in a differential expansion or thrust position measurement configuration, the transducer’s DC response and 0.25 mm resolution allow the monitoring system to track rotor-to-stator differential growth with sub-mil accuracy, supporting turbine startup and shutdown thermal management procedures.

Quality Assurance & Global Logistics

Every 330103-01-07-50-02-00 unit offered through siemensplc.com is sourced as genuine Bently Nevada OEM hardware. Units are inspected upon receipt for physical integrity of the probe body, connector pins, and cable jacket. Original Bently Nevada part labels, date codes, and serial numbers are verified against the manufacturer’s part number matrix and preserved intact. A certificate of conformance (CoC) is available upon request for critical plant procurement requirements.

Packaging follows anti-static and moisture-barrier protocols: each probe assembly is placed in an anti-static foam insert within a sealed moisture barrier bag, then packed in a labeled outer carton. This packaging standard protects the coil assembly and connector contacts during international air freight.

Shipments originate from our warehouse in Xiamen, China. Standard export documentation — commercial invoice, packing list, and certificate of origin — is prepared for each order. Expedited shipping via DHL Express or FedEx International Priority is available for urgent plant shutdown and maintenance scenarios, with typical transit times of 3–5 business days to major industrial hubs in Southeast Asia, the Middle East, Europe, and the Americas. All units carry a 12-month warranty from the date of shipment covering manufacturing defects and functional failure under normal operating conditions.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
© 2026 siemensplc.com. All rights reserved.