Bently Nevada 330104-00-19-05-01-00 Proximity Transducer – 3300 Series

Bently Nevada 330104-00-19-05-01-00 — Eddy-Current Proximity Transducer in the 3300 XL 8mm System

The Bently Nevada 330104-00-19-05-01-00 is a non-contact eddy-current proximity transducer forming part of the 3300 XL 8mm Proximity Transducer System. Within a machinery protection architecture, this transducer occupies the first stage of the signal chain: it converts mechanical displacement of a rotating shaft into a proportional DC voltage that downstream monitors interpret as radial vibration, axial position, or rotational speed. Its role is not passive sensing — it is the primary measurement node whose accuracy and bandwidth determine the fidelity of every protection decision made by the monitoring rack.

Designed to API 670 Fourth Edition requirements, the 330104-00-19-05-01-00 is specified for use on critical turbomachinery including steam turbines, gas turbines, centrifugal compressors, and large motor-driven pumps where undetected shaft excursion can result in catastrophic mechanical failure. The 8 mm probe tip diameter and 5-metre integral cable length of this configuration are selected to match the geometric constraints of standard bearing housings while maintaining the electrical characteristics required by the 3300 XL driver electronics.

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Technical Parameters

Hardware Logical Analysis

The operating principle of the 330104-00-19-05-01-00 is grounded in Faraday induction. The probe coil, driven by a high-frequency oscillator (typically 1.0 MHz carrier) embedded in the paired 3300 XL driver, generates an alternating electromagnetic field at the probe tip. When a conductive target — the shaft — enters this field, eddy currents are induced on the target surface. These eddy currents create a counter-magnetic field that loads the oscillator circuit, reducing its amplitude in proportion to the gap distance. The driver demodulates this amplitude-modulated carrier and outputs a DC voltage linearly proportional to the physical gap.

EMC and Electrical Isolation Architecture: The 330104-00-19-05-01-00 cable assembly uses a coaxial construction with a continuous braided shield referenced to the driver chassis ground. This topology provides first-order rejection of common-mode electrical noise induced by adjacent power cables, variable-frequency drives, and high-current bus bars — all of which are endemic in turbomachinery environments. The shield is grounded at one end only (driver end) to prevent ground-loop currents that would appear as low-frequency noise on the output signal. The coaxial geometry also controls the cable’s characteristic impedance, which is critical for maintaining the oscillator’s Q-factor over the full 5-metre cable run.

Target Material Sensitivity Correction: The eddy-current field penetration depth is a function of target conductivity and permeability. The 330104-00-19-05-01-00 is factory-calibrated against AISI 4140 steel (σ ≈ 4.0 MS/m, μr ≈ 100). For shafts manufactured from austenitic stainless steel (e.g., 316 SS, σ ≈ 1.35 MS/m) or titanium alloys, the scale factor deviates from the nominal 7.87 V/mm. API 670 Annex D mandates target material verification and, where necessary, recalibration of the driver’s gain potentiometer to restore the specified scale factor. This hardware-level calibration flexibility is a deliberate design feature, not a limitation.

Frequency Response and Phase Linearity: The DC-to-10 kHz flat frequency response is achieved by careful selection of the demodulation filter time constant in the driver. At 10 kHz, the probe is capable of resolving shaft events occurring at rotational frequencies up to 600,000 RPM — well beyond the operating range of any practical turbomachine. In practice, the bandwidth is exploited for high-order harmonic analysis (sub-synchronous instability, oil-whirl at 0.43–0.48× running speed) and blade-passing frequency detection in compressor stages. Phase linearity across the passband ensures that orbit plots derived from X-Y probe pairs accurately represent the true elliptical shaft trajectory without geometric distortion.

Mechanical Robustness: The 316 stainless steel probe body provides resistance to the hydrocarbon-laden, high-humidity atmospheres found in compressor seal cavities and turbine bearing pedestals. The integral cable’s outer jacket is rated to 177 °C continuous, matching the probe tip temperature rating and eliminating the thermal mismatch failure mode that affects systems using separate extension cables in high-temperature zones.

System Integration Benefits

• Direct compatibility with 3500 Series monitors: The 330104-00-19-05-01-00 output signal (–24 VDC nominal, 7.87 V/mm) is natively accepted by all Bently Nevada 3500 Series monitor cards without signal conditioning adapters, preserving measurement chain integrity and eliminating inter-device calibration offsets.
• Deterministic latency contribution: The transducer’s analog output introduces zero processing latency — the voltage at the BNC connector is a real-time, continuous representation of gap distance. This is architecturally significant: the 3500 monitor’s protection response time (typically <1 ms for danger-level trips) is not degraded by transducer-side digitization delays.
• Dual-probe orbit analysis: Deploying two 330104-00-19-05-01-00 probes at 90° (X-Y configuration) per bearing journal enables full shaft orbit reconstruction. The 3500/42M monitor card processes both channels simultaneously, computing orbit shape, precession direction, and eccentricity ratio — diagnostic parameters that distinguish mechanical unbalance from fluid-film instability without machine shutdown.
• Keyphasor synchronization: The transducer’s DC-coupled output supports once-per-revolution Keyphasor triggering when the probe is positioned over a shaft notch or keyway. This enables synchronous sampling for 1× and 2× vibration vector tracking, phase-referenced balancing, and torsional analysis — all within the same hardware platform.
• Diagnostic transparency via System 1: When integrated with Bently Nevada System 1 software, the raw gap voltage from the 330104-00-19-05-01-00 is archived at full bandwidth alongside processed vibration vectors. This allows post-event forensic analysis of the exact gap trajectory during a trip event, providing engineering evidence for root-cause determination without reliance on reconstructed data.
• Redundant measurement support: For API 670-compliant 2-out-of-3 (2oo3) voting architectures, three 330104-00-19-05-01-00 probes can be installed at the same bearing plane. The 3500 monitor’s voting logic prevents spurious trips from a single failed transducer while maintaining protection against genuine shaft excursion — a configuration that directly reduces unplanned downtime from false trips.
• Plug-compatible field replacement: The standardized BNC termination and –24 VDC supply requirement mean that a failed transducer can be replaced in the field without reconfiguring the monitor card, re-entering calibration constants, or interrupting adjacent measurement channels. Mean time to repair (MTTR) for transducer replacement is typically under 30 minutes with standard tooling.
• Hazardous area deployment: With appropriate ATEX/IECEx zener barrier or galvanic isolator selection, the 330104-00-19-05-01-00 can be installed in Zone 1 and Zone 2 classified areas (gas groups IIA/IIB), extending its applicability to offshore platforms, LNG facilities, and chemical plant environments where intrinsic safety is a regulatory requirement.

Quality Assurance & Global Logistics

Every Bently Nevada 330104-00-19-05-01-00 unit dispatched from our Xiamen, China facility is a factory-original component procured through verified supply channels. Units are stored in climate-controlled conditions (15–25 °C, RH <60%) to preserve connector integrity and cable jacket properties during storage. Prior to shipment, each unit undergoes a visual inspection against OEM reference photographs, connector pin-out verification, and label authentication. A 12-month warranty covering manufacturing defects is provided from the date of shipment.

Logistics from Xiamen are executed via DHL Express (typical transit: 3–5 business days to Europe, Middle East, and Southeast Asia), FedEx International Priority (2–4 business days to North America), and EMS for destinations with DHL/FedEx service restrictions. All shipments include a commercial invoice, packing list, and certificate of origin. For project orders exceeding 10 units, dedicated freight coordination and consolidated customs documentation are available upon request. Export compliance screening is applied to every order in accordance with applicable dual-use regulations.

Contact Information

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