Bently Nevada 330104-00-07-10-01-CN Proximity Probe – 3300 XL Series

Bently Nevada 330104-00-07-10-01-CN — Eddy-Current Proximity Probe for Continuous Shaft Displacement Monitoring

The 330104-00-07-10-01-CN is an 8 mm eddy-current proximity probe within Bently Nevada’s 3300 XL platform, configured with a 7.0-metre (22.9 ft) stainless-steel armored extension cable and a CN-type coaxial connector. Its primary function in a rotating machinery protection loop is to deliver a continuous, non-contact DC voltage signal proportional to the gap between the probe tip and the target shaft surface. This signal feeds directly into a 3300 XL Proximitor driver, which conditions and scales it before transmission to the monitor rack — forming the foundational measurement chain mandated by API 670 5th Edition for turbomachinery protection.

In a radial vibration channel, the probe is mounted in a bracket at 90° or 45° to the shaft centerline. The Proximitor driver supplies a regulated −24 VDC excitation to the probe coil, generating a high-frequency (1.0 MHz nominal) oscillating electromagnetic field at the probe tip. When a conductive target enters this field, eddy currents are induced on the shaft surface, loading the oscillator circuit and producing a measurable change in output voltage. The 3300 XL 8mm system delivers a nominal scale factor of 7.87 V/mm (200 mV/mil) across a linear measurement range of 0.25 mm to 2.26 mm (10–90 mil), with a gap voltage at mid-range of approximately −10 VDC. This linearity is maintained across the probe’s full operating temperature envelope without requiring field recalibration.

The 7-metre cable configuration addresses a common plant-layout constraint: monitor racks are frequently located in instrument rooms or marshalling cabinets positioned 5–8 metres from the machine casing. Using a matched-length extension cable preserves the calibrated electrical characteristics of the probe-cable-driver system. Substituting an unmatched cable length invalidates the factory calibration and introduces scale factor error — a critical compliance issue under API 670. The 330104-00-07-10-01-CN eliminates this risk by providing a factory-assembled, factory-calibrated cable assembly.

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

Technical Parameters

Hardware Logical Analysis

The 3300 XL 8mm probe system is built around a three-component measurement chain: probe, extension cable, and Proximitor driver. Each element is electrically matched at the factory. The probe coil is wound to a precise inductance value that, when combined with the extension cable’s distributed capacitance and the Proximitor’s internal oscillator circuit, produces the specified 1.0 MHz resonant frequency. Deviation from this frequency — caused by cable length mismatch, damaged coil windings, or connector contamination — shifts the operating point on the probe’s characteristic curve and introduces a proportional scale factor error. This is why the part number encodes the cable length (the “07” field = 7 metres) as a calibration-critical parameter, not merely a mechanical dimension.

The stainless steel armor on the extension cable serves a dual function. Mechanically, it protects the coaxial inner conductor from crush loads, vibration fatigue, and rodent damage in cable trays. Electrically, it acts as an EMC shield, attenuating external electromagnetic interference that would otherwise couple into the high-impedance probe signal path and appear as noise on the vibration channel. In environments with variable-frequency drives, large motor starters, or high-current bus bars in proximity, this shielding is the primary defense against false vibration readings.

The CN connector uses a precision-machined coaxial interface with a defined characteristic impedance matched to the cable. Impedance discontinuities at the connector — caused by corrosion, mechanical deformation, or incorrect mating — produce signal reflections that manifest as baseline noise on the monitor. The CN connector’s gold-plated center pin and PTFE dielectric maintain impedance integrity across the probe’s full temperature range, including thermal cycling between cold startup and steady-state operating temperature.

The probe body itself is constructed from 316 stainless steel with a ceramic-filled epoxy tip encapsulant. This encapsulant provides electrical isolation between the coil and the process environment while maintaining dimensional stability at elevated temperatures. The probe thread (M10 × 1.0 standard) allows precise gap adjustment during commissioning, with the lock nut securing the set position against vibration-induced loosening.

System Integration Benefits

• Direct drop-in replacement: The 330104-00-07-10-01-CN is pin-compatible and electrically interchangeable with all existing 3300 XL 8mm installations using 7-metre CN-terminated cables — no rewiring, no recalibration of the Proximitor driver required.
• Deterministic signal latency: The eddy-current measurement chain introduces no mechanical hysteresis or contact bounce. Signal propagation from shaft displacement to monitor input is governed solely by the Proximitor’s analog bandwidth (typically DC to 10 kHz), enabling sub-millisecond detection of shaft excursions.
• Diagnostic transparency: The DC gap voltage output provides a continuous, readable health indicator. A drifting gap voltage at steady-state speed indicates probe fouling, bracket loosening, or shaft wear — all detectable before a trip event occurs.
• Multi-parameter capability: A single probe model serves radial vibration, axial position, differential expansion, and eccentricity measurement channels by changing only the monitor card configuration — reducing spare parts inventory complexity.
• Hot-swap compatibility: With the machine at rest and the Proximitor de-energized, probe replacement requires no special tooling beyond a calibrated gap-setting gauge and a torque wrench — mean time to repair under 30 minutes for a trained technician.
• API 670 alarm/trip integration: The probe’s output voltage range maps directly to the 3300 XL monitor’s configurable alert and danger setpoints, supporting both absolute vibration and 1× filtered vector alarms without additional signal conditioning.
• Redundant channel support: Two probes mounted at 90° (XY configuration) provide full vector vibration data, enabling orbit plot analysis and precise identification of rotor dynamic faults — unbalance, misalignment, rub, and fluid instability.
• Long-term calibration stability: The probe’s passive coil design contains no active components subject to drift. Scale factor stability over a 10-year service life is within ±1% when the probe is operated within its rated temperature range and the target surface is maintained in good condition.

Quality Assurance & Global Logistics

Every 330104-00-07-10-01-CN unit dispatched from our Xiamen facility undergoes a structured pre-shipment verification process. Part number, revision code, and manufacture date code are cross-referenced against Bently Nevada’s published documentation. The probe tip, cable armor, and CN connector are inspected for physical integrity — deformation, corrosion, or jacket damage that would compromise field performance. Units sourced from authorized distribution channels are accompanied by original manufacturer documentation; surplus units carry a certificate of conformance issued after our internal inspection.

Packaging follows anti-static and moisture-barrier protocols: each probe assembly is individually bagged, cushioned, and labeled with part number and inspection status before placement in a rigid outer carton. For international shipments, we prepare a full commercial invoice, packing list, and certificate of conformance. Export classification and HS code documentation are provided on request to support customs clearance in any destination country.

Xiamen’s geographic position — direct access to Xiamen Gaoqi International Airport and Xiamen Port — enables same-day handover to DHL Express, FedEx International Priority, and major freight forwarders. In-stock units typically reach European and Southeast Asian destinations within 3–5 business days; North American and Middle Eastern destinations within 5–7 business days. Urgent AOG (aircraft-on-ground equivalent) shipments for critical plant shutdowns are accommodated with same-day dispatch on confirmed orders received before 14:00 CST.

All units carry a 12-month warranty from the date of shipment, covering manufacturing defects and premature failure under normal operating conditions. Warranty claims are processed with a replacement-first policy to minimize customer downtime.

Contact Information

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