Bently Nevada 330101-00-49-90-02-05 Proximity Probe – 3300 XL 8mm

Bently Nevada 330101-00-49-90-02-05 — Eddy Current Proximity Probe for Shaft Displacement Measurement in Critical Rotating Machinery

The 330101-00-49-90-02-05 is a factory-configured eddy current proximity probe within the Bently Nevada 3300 XL 8mm Proximity Transducer System. Its primary function in a machinery protection loop is to convert the physical gap between the probe tip and a conductive target shaft into a proportional DC voltage signal, delivering continuous, non-contact measurement of radial shaft vibration and axial position. The probe operates on the principle of electromagnetic induction: a high-frequency oscillator (typically 1.0 MHz carrier) drives a coil embedded in the probe tip, generating an alternating magnetic field. When a conductive target enters this field, eddy currents are induced on the target surface, loading the oscillator circuit and producing a measurable impedance change. This impedance shift is demodulated by the companion Proximitor® sensor into a linear DC output of –7.87 V/mm (–200 mV/mil), which feeds directly into the Bently Nevada 3500 Series Machinery Protection System or equivalent monitoring hardware.

This specific part number encodes a 1.0 m integral probe cable and a 5.0 m armored extension cable, yielding a total system cable length of 6.0 m — a configuration widely specified for mid-frame turbines, centrifugal compressors, and boiler feed pumps where the Proximitor sensor must be mounted outside the bearing housing but within practical cable-routing distance. The probe tip diameter of 8 mm defines the linear measurement range and the target area requirement, and the standard connector interface ensures direct interchangeability with all 3300 XL 8mm Proximitor sensors without system recalibration, provided the matched part number is maintained.

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Technical Parameters

Hardware Logical Analysis

The 3300 XL 8mm probe architecture addresses three principal engineering challenges in continuous machinery monitoring: electromagnetic interference rejection, thermal stability across wide operating ranges, and long-term mechanical integrity in hostile process environments.

EMC Design and Shielding Architecture: The probe cable assembly uses a triaxial construction — inner conductor, inner shield (driven at the same potential as the center conductor via the Proximitor’s guard drive circuit), and outer shield connected to instrument ground. This driven-guard topology eliminates capacitive leakage currents along the cable length, which would otherwise introduce measurement errors proportional to cable length. The result is that the 5.0 m extension cable in this configuration contributes negligible phase shift or amplitude error across the 0–10 kHz measurement bandwidth, a critical requirement for accurate 1× and 2× vibration vector analysis in API 670-compliant systems.

Thermal Compensation: The probe coil is wound on a ceramic bobbin with a controlled thermal coefficient of expansion. The Proximitor sensor’s internal oscillator circuit includes a temperature-compensated reference network that maintains the carrier frequency within ±0.1% across the full –35°C to +177°C probe operating range. This ensures that the scale factor of –7.87 V/mm remains within the ±1% tolerance band without field recalibration, even in applications where probe body temperature cycles significantly between startup and steady-state operation — a common condition in steam turbine bearing housings.

Mechanical Integrity and Hermetic Sealing: The 316 stainless steel probe body is hermetically sealed at the tip using a glass-to-metal seal, preventing process fluid ingress into the coil cavity. The cable-to-body junction is epoxy-potted and strain-relieved to withstand the mechanical vibration environment specified in IEC 60068-2-6 (10–2000 Hz, 20 g). The armored extension cable uses a stainless steel braid over the triaxial core, providing both mechanical protection and an additional EMI shield layer in environments with high-power variable-frequency drives or large motor starters in proximity.

Impedance Matching and System Calibration: The 3300 XL system is factory-calibrated as a matched set: probe + extension cable + Proximitor. The calibration encodes the combined cable impedance and probe coil characteristics into the Proximitor’s demodulation circuit. Substituting the 330101-00-49-90-02-05 with an identical part number preserves this calibration without requiring a field gap calibration procedure, reducing maintenance time and eliminating the risk of calibration error during hot-standby replacement scenarios.

System Integration Benefits

• Direct API 670 Compliance: The probe and system meet the transducer performance requirements of API 670 5th Edition, including scale factor tolerance, frequency response, and temperature range — eliminating the need for supplementary compliance documentation in new machinery acceptance testing.
• Zero-Recalibration Hot Swap: Identical part number replacement preserves the factory-matched calibration of the Proximitor sensor, allowing maintenance teams to execute probe replacement during a planned outage without a gap calibration procedure, reducing bearing housing exposure time.
• Deterministic Frequency Response to 10 kHz: The flat ±3 dB bandwidth from DC to 10,000 Hz captures subsynchronous instabilities (oil whirl at 0.43–0.48×), synchronous 1× imbalance, and supersynchronous blade-pass frequencies in a single measurement channel without anti-aliasing concerns at standard 3500 Series sampling rates.
• Driven-Guard Cable Topology: Eliminates cable-length-dependent measurement errors, allowing the 6.0 m total cable length to be routed through congested cable trays adjacent to power conductors without introducing common-mode noise into the vibration signal chain.
• Differential Diagnostic Capability: When installed in orthogonal X-Y pairs per API 670, the probe pair enables full shaft centerline orbit analysis, providing maintenance engineers with vector data sufficient to distinguish mechanical looseness, misalignment, and fluid-film instability without additional instrumentation.
• Broad Target Material Compatibility: While optimized for AISI 4140 steel, the 3300 XL system provides documented correction factors for alternative target materials (304 SS, Inconel 718, titanium alloys), enabling deployment on non-standard shaft materials without system replacement.
• Hazardous Area Certification: ATEX and FM system-level approvals permit installation in Zone 1/Division 1 classified areas — gas turbine enclosures, compressor buildings, and offshore platform machinery spaces — without supplementary barrier hardware when used with the approved Proximitor sensor.
• Long-Term Signal Stability: The hermetically sealed coil assembly and temperature-compensated Proximitor circuit maintain scale factor drift below 0.5% per year under continuous operation, supporting condition monitoring trend analysis over multi-year intervals without recalibration-induced baseline shifts.

Quality Assurance & Global Logistics

Every 330101-00-49-90-02-05 unit supplied by siemensplc.com is sourced as genuine Bently Nevada (Baker Hughes) OEM hardware. Prior to dispatch, each probe assembly undergoes a structured verification protocol: physical inspection of the probe tip, cable jacket, connector, and labeling against OEM specifications; impedance and continuity measurement of the probe coil and cable assembly; and cross-reference of the serial number against procurement documentation to confirm authentic origin. Units are packaged in anti-static, moisture-barrier packaging with foam-lined cartons to protect the probe tip geometry and cable terminations during international transit.

Shipments originate from Xiamen, China — a major southeastern China port city with direct access to international express freight networks including DHL, FedEx, and UPS, as well as consolidated sea freight services to major industrial hubs in Southeast Asia, the Middle East, Europe, and the Americas. Standard international express delivery to most destinations is achieved within 3–7 business days from order confirmation. Full export documentation is provided with every shipment: commercial invoice, packing list, certificate of origin, and material safety data where applicable. For buyers requiring customs pre-clearance documentation or specific HS code declarations, our logistics team coordinates directly with freight forwarders to ensure compliant and expedited customs processing. A 12-month warranty against manufacturing defects is provided on all units from the date of shipment.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
© 2026 siemensplc.com. All rights reserved.

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