Bently Nevada 330104-10-25-10-02-00 Proximity Transducer – 330104 Series

Bently Nevada 330104-10-25-10-02-00 — Eddy-Current Proximity Transducer in Rotating Machinery Protection Loops

The Bently Nevada 330104-10-25-10-02-00 is a 5 mm eddy-current proximity transducer configured with a 25 ft (7.62 m) armored extension cable and a 10 ft (3.05 m) driver cable, terminated with a 10-32 UNF threaded tip. Within a continuous machinery protection architecture, this transducer occupies the first stage of the signal chain: it converts mechanical shaft displacement into a proportional DC voltage that downstream monitors — typically Bently Nevada 3300 or 3500 Series racks — interpret as radial vibration, axial position, or differential expansion data. The output scale factor of 200 mV/mil (7.87 V/mm) provides the resolution granularity required for API 670-compliant alarm and trip setpoint configuration on high-speed rotating equipment such as steam turbines, centrifugal compressors, and boiler feed pumps.

Unlike contact-type displacement sensors, the 330104 series operates on the principle of electromagnetic induction: a high-frequency oscillator within the paired driver (oscillator-demodulator) drives a coil embedded in the probe tip, generating an alternating magnetic field. When a conductive target surface — typically a shaft ground to Ra ≤ 0.8 µm — enters the field, eddy currents are induced, loading the oscillator circuit. The driver converts this impedance change into a linear DC voltage output, with a nominal bias of –24 VDC at the calibrated mid-gap of approximately 1.27 mm (50 mil). This non-contact architecture eliminates mechanical wear entirely, making the sensor suitable for continuous 24/7 operation across the full equipment lifecycle without scheduled replacement intervals.

The 330104-10-25-10-02-00 is stocked at our Xiamen, China facility and ships globally via DHL Express and FedEx International Priority. All units are sourced through verified channels and carry a 12-month quality warranty. For real-time stock confirmation and RFQ, contact: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

The 330104-10-25-10-02-00 implements a three-component signal chain: probe body, extension cable, and oscillator-demodulator driver. Each element is factory-matched and calibrated as a system — substituting individual components from different serial batches will shift the scale factor and bias point, invalidating the calibration curve. This system-matched architecture is a deliberate design constraint that enforces traceability and prevents field-level calibration drift.

Electromagnetic Compatibility (EMC) Design: The extension cable uses a double-shielded, twisted-pair construction with a drain wire terminated at the driver end only (single-point grounding). This topology suppresses common-mode noise induced by adjacent power cables, variable-frequency drives, and high-current bus bars — all of which are endemic in turbomachinery skid environments. The shield is floated at the probe end to prevent ground loop currents that would appear as low-frequency noise on the output signal, corrupting slow-roll vibration data below 10 Hz.

Thermal Stability: The probe tip coil is wound with a temperature-compensated formulation that maintains scale factor linearity within ±1% across the full –35°C to +121°C operating envelope. In steam turbine bearing housings where ambient temperatures routinely exceed 80°C, this thermal stability is critical for maintaining consistent alarm setpoints without seasonal recalibration.

Gap Linearity and Target Surface Requirements: The 200 mV/mil scale factor is specified for AISI 4140 steel targets with a surface finish of Ra ≤ 0.8 µm. Austenitic stainless steel shafts (e.g., 316L) exhibit lower magnetic permeability, which reduces the effective scale factor by approximately 8–12% and requires a target material correction factor to be applied in the monitor configuration. Shaft surface runout (mechanical + electrical) must be characterized during slow-roll calibration to establish a valid reference waveform for 1× and 2× vibration vector analysis.

Cable Impedance Matching: The 25 ft extension cable is impedance-matched to the 330104 probe coil inductance. Extending the cable beyond the rated length by splicing additional cable segments will alter the resonant frequency of the LC circuit formed by the coil and cable capacitance, shifting the oscillator operating point and degrading linearity at the upper end of the gap range. Field extensions must use Bently Nevada 330130-series extension cables with matched impedance specifications.

System Integration Benefits

• Direct rack compatibility: The –24 VDC bias output is natively compatible with Bently Nevada 3300 XL and 3500 Series monitor input cards without signal conditioning adapters, reducing wiring complexity and eliminating potential signal degradation points in the measurement loop.
• API 670 alarm architecture support: The 200 mV/mil scale factor maps directly to the standard alarm and danger setpoint tables defined in API 670 (5th Edition) for radial vibration on Category I and II machines, enabling straightforward setpoint configuration without custom scaling.
• Deterministic frequency response: The DC-to-10,000 Hz bandwidth covers the full spectrum of interest for rotating machinery diagnostics, including subsynchronous instability (oil whirl/whip at 0.43–0.48×), 1× unbalance, 2× misalignment, and high-frequency blade-pass frequencies on compressors with 20+ vanes at 3,000 RPM.
• Non-contact zero-wear operation: Continuous operation without mechanical contact eliminates sensor-induced shaft loading and removes the sensor from the maintenance schedule, reducing planned outage scope on critical trains.
• Diagnostic transparency via DC gap monitoring: The DC component of the output voltage provides a continuous, real-time measurement of average shaft centerline position. Trending this value over time reveals bearing wear progression, thermal growth of the rotor, and changes in oil film stiffness — data that is invisible to velocity or acceleration sensors.
• Redundant loop architecture readiness: The 330104 probe is dimensionally and electrically identical across the series, enabling dual-probe redundant configurations (XY probe pairs at 90°) for full vector vibration analysis and voting logic in 2-out-of-3 trip architectures without additional mounting hardware.
• DCS integration via 4–20 mA converters: The –24 VDC output can be conditioned through standard signal converters to produce a 4–20 mA loop signal for integration into DCS historian tags, enabling long-term vibration trend data to be stored alongside process variables (temperature, pressure, flow) in a unified data model.
• Minimal installation footprint: The 5 mm tip diameter and 10-32 UNF thread allow installation in compact bearing housings where larger 8 mm probes cannot be accommodated, expanding the applicability of the 330104 series to smaller auxiliary machines (lube oil pumps, seal gas compressors) on the same monitoring rack.

Quality Assurance & Global Logistics

Every Bently Nevada 330104-10-25-10-02-00 unit supplied by siemensplc.com is sourced through verified procurement channels with full part traceability. Prior to dispatch, each assembly undergoes a physical inspection covering connector pin integrity, cable jacket continuity, label marking accuracy against the OEM part number matrix, and a functional output check at the nominal 50 mil gap. Units that do not meet the acceptance criteria are quarantined and not shipped.

Shipments originate from our Xiamen, China warehouse. Standard export documentation — commercial invoice, packing list, and certificate of origin — is prepared for every order. For orders requiring a certificate of conformance or material traceability report, these are available upon written request at the time of order placement. Typical dispatch lead time for in-stock units is 1–3 business days. International express delivery via DHL Express or FedEx International Priority reaches most destinations in Southeast Asia within 3–5 business days, Europe within 5–7 business days, and North America within 5–8 business days. Sea freight consolidation is available for bulk orders of 10+ units where air freight cost is a constraint. All shipments are covered by a 12-month warranty against manufacturing defects from the date of shipment.

Contact Information

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