Bently Nevada 330104-00-06-05-02-00 Proximity Probe – 3300 XL Series

Bently Nevada 330104-00-06-05-02-00 — 8 mm Eddy-Current Proximity Probe in Rotating Machinery Protection Systems

The 330104-00-06-05-02-00 is an 8 mm diameter eddy-current proximity probe from Bently Nevada’s 3300 XL Series, engineered for continuous, non-contact measurement of radial shaft vibration and axial position in critical rotating equipment. Within an API 670-compliant machinery protection architecture, this probe functions as the primary sensing transducer: it converts mechanical displacement into a proportional DC voltage signal that feeds monitor racks for alarm and danger relay logic. Its role is not passive — the probe’s electromagnetic field characteristics directly determine the signal fidelity, linearity, and noise floor of the entire measurement chain.

Deployed across gas turbines, steam turbines, centrifugal compressors, boiler feed pumps, and hydro turbines in power generation, petrochemical refining, LNG processing, and heavy manufacturing, the 330104-00-06-05-02-00 operates in environments where measurement error is not an option. A 1 mil (25.4 µm) deviation in shaft position reading can be the difference between a scheduled maintenance window and an unplanned catastrophic failure. The probe’s 7.87 V/mm (200 mV/mil) output sensitivity and DC-to-10 kHz frequency response ensure that both quasi-static position drift and high-frequency sub-synchronous instabilities are captured within a single measurement channel.

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Technical Parameters

Hardware Logical Analysis

The 330104-00-06-05-02-00 operates on the principle of impedance modulation within a resonant LC oscillator circuit. The probe coil, driven at a carrier frequency typically in the range of 1–2 MHz by the paired Proximitor module (e.g., 330180 series), generates a high-frequency electromagnetic field that penetrates the conductive target surface. As the air gap between probe tip and shaft changes, eddy currents induced in the target alter the effective inductance and resistance of the probe coil, shifting the oscillator’s operating point. The Proximitor demodulates this shift into a linear DC voltage output proportional to gap distance.

EMC Design: The integral 5 m armoured cable is a critical component of the system’s electromagnetic compatibility architecture. The cable’s characteristic impedance is matched to both the probe coil and the Proximitor input to suppress standing-wave reflections that would introduce measurement noise at high shaft rotation frequencies. The outer armour provides a continuous Faraday shield, attenuating capacitively coupled interference from adjacent power cables, VFD switching transients, and RF sources common in industrial plant environments. This shielding is terminated at the Proximitor end only — single-point grounding prevents ground-loop currents from superimposing 50/60 Hz hum onto the DC output signal.

Thermal Stability: The probe body’s operating range of –35 °C to +177 °C is achieved through the selection of high-temperature-rated coil winding materials and a ceramic-filled epoxy potting compound that maintains dimensional stability across thermal cycles. Thermal expansion of the probe housing is characterised and compensated in the Proximitor calibration, ensuring that temperature-induced apparent gap changes remain below the system’s measurement uncertainty budget across the full operating range.

Target Material Dependency: The standard calibration curve is optimised for AISI 4140 steel (relative permeability µr ≈ 100, electrical conductivity σ ≈ 4.6 × 10⁶ S/m). For non-standard target materials — austenitic stainless steel, titanium alloy, aluminium — the eddy-current penetration depth and induced loss characteristics differ, shifting the sensitivity curve. Bently Nevada provides material-specific calibration data; users must apply the correct curve or request a factory-calibrated probe for the target alloy to maintain measurement traceability.

System Integration Benefits

• Direct API 670 Compliance: The 330104-00-06-05-02-00 is dimensionally and electrically specified to satisfy API 670 Fifth Edition requirements for radial vibration and position transducer systems, eliminating the need for additional interface conditioning when integrating with 3500-series monitor racks.
• Deterministic Real-Time Response: The DC-to-10 kHz frequency response ensures that shaft dynamic events — including sub-synchronous instabilities at fractional running speed and super-synchronous harmonics up to the 10th order at 600 Hz running speed — are captured without phase lag introduced by high-pass filtering, preserving the time-domain integrity of orbit plots.
• Single-Channel DC + AC Measurement: Because the output extends to DC, a single probe channel simultaneously provides static gap (bearing clearance, thrust position) and dynamic vibration data. This eliminates the need for separate position transducers in many installations, reducing wiring complexity and panel space.
• Drop-In Backward Compatibility: The 330104-00-06-05-02-00 is pin-for-pin and calibration-compatible with legacy 3300 Series probes. Replacement does not require recalibration of 3500/40M or 3500/42M monitor cards when the target material is unchanged, minimising maintenance downtime.
• Diagnostic Transparency via Proximitor OK Circuit: When paired with a 330180-series Proximitor, the system provides a hardware-level OK output that monitors probe gap continuously. If the gap moves outside the linear range — due to probe damage, cable fault, or shaft contact — the OK relay de-energises, triggering a system alert before false vibration data can propagate to the protection logic.
• High MTBF Solid-State Construction: With no moving parts, no wear surfaces, and no lubrication requirements, the probe’s failure modes are limited to coil insulation degradation and connector corrosion. Field MTBF data from turbomachinery installations consistently exceeds 15 years under normal operating conditions.
• Hazardous Area Suitability: ATEX certification allows deployment in Zone 1 and Zone 2 classified areas (gas group and temperature class per datasheet), covering the majority of petrochemical and refinery applications without requiring additional intrinsic safety barriers in the signal loop.
• Orbit and Waveform Analysis Readiness: Two probes mounted at 90° on the same bearing journal — a standard API 670 configuration — produce X-Y displacement signals that, when processed by a Bently Nevada 3500 rack or ADRE data acquisition system, generate shaft orbit plots. The 330104-00-06-05-02-00’s matched sensitivity and phase response between units ensures that orbit shape distortion due to transducer mismatch is below 2%, meeting the accuracy requirements for rotor dynamic diagnostics.

Quality Assurance & Global Logistics

Every 330104-00-06-05-02-00 unit offered through siemensplc.com is sourced from authorised OEM supply channels and certified industrial surplus distributors with full part traceability. Incoming inspection covers visual examination, dimensional verification of probe tip geometry, and functional gap-voltage linearity testing across the full 0.25–2.25 mm measurement range. Units that do not meet the published sensitivity tolerance of ±1% are rejected. Original OEM calibration certificates and material declarations are available upon request.

Packaging follows Bently Nevada storage and handling guidelines: ESD-safe inner wrap, rigid outer carton, silica gel desiccant, and shock-indicator label. Storage conditions are maintained at 15–25 °C and below 60% relative humidity throughout the warehouse cycle.

Logistics operations are based in Xiamen, China, with daily dispatch via DHL Express, FedEx International Priority, and UPS Worldwide Express. Typical transit times are 3–5 business days to Southeast Asia, 4–7 business days to Europe and the Middle East, and 5–8 business days to the Americas. All shipments include a commercial invoice, packing list, and certificate of origin. ATEX/CE declarations and export classification documentation (EAR99/NLR) are provided on request. For orders of five or more units, consolidated packing and volume freight options are available — contact us for a logistics quotation.

Contact Information

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