Bently Nevada 330104-00-16-05-02-00 Proximity Probe – 3300 XL

Bently Nevada 330104-00-16-05-02-00 — Eddy-Current Proximity Probe for Critical Rotating Machinery Protection

The Bently Nevada 330104-00-16-05-02-00 is an 8 mm eddy-current proximity probe belonging to the 3300 XL Proximity Transducer System. It operates on the principle of electromagnetic induction: a high-frequency oscillating current (typically 1.0 MHz) is driven through a coil wound at the probe tip, generating an alternating magnetic field. When a conductive target — standard calibration material AISI 4140 steel — enters this field, eddy currents are induced on the target surface, loading the oscillator circuit and producing a proportional change in output voltage. This voltage-gap relationship is linear across the calibrated measurement range of 0.25 mm to 2.25 mm (10 mil to 90 mil), with a nominal sensitivity of 7.87 V/mm (200 mV/mil).

The part number encodes the full mechanical and electrical configuration: 330104 identifies the 3300 XL 8 mm probe series; 00 denotes standard agency approval (no ATEX/FM special suffix); 16 specifies a 5 m (16 ft) integral armored probe cable; 05 specifies a 5 m extension cable, yielding a 10 m total calibrated cable system; 02 identifies the standard connector; and the trailing 00 indicates no special options. The total cable length is a calibration-critical parameter — the driver’s oscillator is tuned to the combined cable capacitance of the matched set. Substituting a different extension length without recalibration shifts the gap voltage baseline and degrades measurement linearity.

This probe is designed for continuous, non-contact measurement in environments where physical contact with the rotating shaft is mechanically impossible or operationally unacceptable. It delivers DC-coupled output from 0 Hz to 10,000 Hz (–3 dB), making it suitable for both quasi-static position measurement (axial thrust, differential expansion) and dynamic vibration analysis up to the 10th harmonic of a 1,000 RPM machine. Supply voltage is –24 VDC nominal; output swings from –1 VDC (near gap) to –17 VDC (far gap), providing a 16 V dynamic range across the linear zone.

In turbomachinery protection architectures governed by API 670, the 330104-00-16-05-02-00 is deployed in matched pairs for X-Y radial vibration measurement, providing the shaft orbit data required to detect sub-synchronous instability, oil whirl, and rub events before they escalate to mechanical failure. The probe’s –35°C to +121°C operating range at the tip accommodates bearing housing temperatures in steam turbines and hot-section compressors without signal drift.

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Technical Parameters

Hardware Logical Analysis

The 3300 XL probe system employs a three-component architecture: the probe itself (330104), the extension cable, and the Proximitor sensor (driver). The probe tip coil is wound on a ferrite core and encapsulated in a thermoplastic housing rated for continuous immersion in lubricating oil. The coil’s Q-factor is matched to the Proximitor’s oscillator circuit at the factory, establishing the calibration baseline. Any deviation in cable capacitance — caused by cable damage, moisture ingress at connectors, or length substitution — directly alters the oscillator’s loaded Q and shifts the output voltage at a given gap distance.

The integral cable uses a coaxial construction with a low-loss polyethylene dielectric, maintaining consistent characteristic impedance across the operating temperature range. The outer armor is stainless steel braid, providing mechanical protection against abrasion in bearing housing environments and acting as an EMC shield. The shield is grounded at the Proximitor end only (single-point grounding), preventing ground loop currents that would appear as low-frequency noise on the output signal — a critical design choice in facilities where multiple machines share a common ground bus.

The probe tip geometry is optimized for an 8 mm sensing diameter, which defines the effective sensing area and the depth of the eddy-current field penetration into the target. At 1.0 MHz excitation, skin depth in AISI 4140 steel is approximately 0.08 mm, confining the induced currents to the shaft surface layer. This makes the measurement insensitive to shaft material variations below the surface — a significant advantage over contact-type displacement sensors in applications where shaft metallurgy varies along the axial length.

EMC performance is achieved through the combination of coaxial shielding, the Proximitor’s internal filtering, and the inherently narrow-band nature of the eddy-current measurement. The oscillator operates at a fixed carrier frequency well above the industrial noise band (50/60 Hz and harmonics), and the demodulated DC output is low-pass filtered before presentation to the monitor. This architecture provides effective rejection of conducted and radiated interference without requiring external filtering at the monitor input.

System Integration Benefits

• API 670 compliance out of the box: The 330104 series is the reference probe for API 670 machinery protection specifications. Procurement engineers can cite the part number directly in project specifications without additional qualification testing.
• Plug-and-play with 3300 XL and 3500 series monitors: The probe is calibrated as a matched set with the 3300 XL Proximitor sensor. No field calibration is required at installation — gap the probe to the nominal center gap voltage (–10.0 VDC ± 0.5 V) and the system is operational.
• Deterministic DC-coupled output: The 0 Hz lower frequency limit means the probe captures both static position (thrust position, differential expansion) and dynamic vibration in a single channel, eliminating the need for separate position and vibration transducers on the same measurement plane.
• Shaft orbit reconstruction: Paired X-Y installations with this probe provide the raw voltage signals required by 3500 series monitors to compute and display shaft orbit plots — the primary diagnostic tool for identifying rotor dynamic instabilities including oil whirl (typically 40–48% of running speed) and mechanical looseness.
• Keyphasor synchronization: The probe’s flat frequency response to 10,000 Hz allows it to serve as a speed/phase reference (Keyphasor) channel when installed over a notch or projection on the shaft, enabling synchronous time averaging and order-tracked spectrum analysis in the monitoring system.
• Diagnostic transparency via gap voltage monitoring: The –24 VDC supply and –1 to –17 VDC output range allow the monitor to detect probe faults (open circuit: output near 0 V; short circuit: output near supply rail) and distinguish them from actual shaft excursions, providing continuous self-diagnostics without interrupting the measurement channel.
• Temperature stability across bearing housing range: The –35°C to +121°C probe tip rating covers the full operating envelope of most steam turbine bearing housings (typically 60°C to 100°C) and cold-climate startup conditions, without requiring temperature compensation at the monitor.
• Minimal installation footprint: The 8 mm tip diameter requires a standard M10 × 1.0 threaded boss in the bearing housing, a geometry that is pre-machined into most OEM turbine and compressor casings designed for Bently Nevada instrumentation, eliminating field machining costs during retrofit projects.

Quality Assurance & Global Logistics

Every unit of the 330104-00-16-05-02-00 supplied by siemensplc.com is sourced from verified Bently Nevada (Baker Hughes) authorized distribution channels or authenticated surplus inventory with full chain-of-custody documentation. Before dispatch, each probe undergoes a multi-point inspection protocol: visual examination of the tip encapsulant and cable armor for mechanical damage; connector pin inspection for corrosion and seating integrity; and cable continuity verification using a calibrated LCR meter to confirm coaxial capacitance within the factory-specified tolerance band for the 10 m total cable system.

Original factory documentation — including the calibration data sheet, material certificate, and applicable CE declaration of conformity — is available upon request and accompanies OEM-packaged units. Surplus units are supplied with a siemensplc.com inspection report and can be accompanied by a third-party recalibration certificate from an accredited metrology laboratory if required by the end-user’s quality management system.

Shipments originate from our Xiamen, China warehouse. Xiamen is a designated free-trade port with direct air freight connections to major industrial hubs in Southeast Asia, the Middle East, Europe, and the Americas. Standard in-stock orders are processed within 24 hours and dispatched via DHL Express, FedEx International Priority, or UPS Worldwide Expedited — typical transit times of 3–5 business days to most destinations. For project-critical shipments, same-day dispatch is available on orders confirmed before 14:00 CST. Export documentation including commercial invoice, packing list, and certificate of origin is prepared in compliance with destination country import requirements.

Contact Information

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