Bently Nevada 330104-00-20-10-01-CN Proximity Probe – 3300 XL Series

Bently Nevada 330104-00-20-10-01-CN: 5 mm Eddy-Current Proximity Probe for Shaft Vibration and Position Measurement in Critical Rotating Machinery

The 330104-00-20-10-01-CN is a 5 mm tip-diameter, non-contact eddy-current proximity probe within the Bently Nevada 3300 XL transducer platform, manufactured by Baker Hughes. It functions as the primary sensing element in a three-component measurement chain — probe, extension cable, and proximitor — designed to deliver continuous, high-resolution shaft displacement data to machinery protection monitors and distributed control systems. The probe is configured with a 200 mm integral cable and carries the CN regional compliance designation, confirming calibration traceability for installations subject to Chinese national standards. In rotating machinery protection, this probe occupies the first stage of the signal path: its tip coil generates a high-frequency electromagnetic field that interacts with the conductive target shaft surface; any change in air gap modulates the coil impedance, and this modulation is transmitted via the extension cable to the proximitor for demodulation into a DC voltage proportional to displacement. The output is DC-coupled, meaning the probe simultaneously resolves dynamic vibration amplitudes and static shaft centerline position — a capability that distinguishes eddy-current systems from accelerometer-based alternatives in low-speed and mixed-frequency machinery applications.

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Technical Parameters

Hardware Logical Analysis

The 330104-00-20-10-01-CN operates on the Lenz’s law induction principle: the oscillator circuit within the paired proximitor drives the probe coil at a carrier frequency typically in the range of 200 kHz to 2 MHz. When a conductive target enters the probe’s electromagnetic field, eddy currents are induced on the target surface, extracting energy from the coil and reducing its effective Q-factor. The proximitor’s demodulation stage converts this impedance shift into a linear DC voltage output, with the scale factor held to ±1% of nominal across the calibrated linear range.

The 5 mm tip geometry of the 330104 series is optimized for shaft diameters typically encountered in turbomachinery bearing journals (50 mm – 300 mm range), where the probe-to-shaft diameter ratio remains within the correction factor envelope defined in the Bently Nevada calibration standard. The PEEK tip insert provides electrical isolation between the coil assembly and the stainless steel housing, preventing ground loop interference that would otherwise corrupt the low-level impedance signal. The integral cable is a precision coaxial construction with controlled characteristic impedance, ensuring that the RF signal from the probe tip reaches the extension cable junction without reflections that would introduce measurement nonlinearity.

EMC performance is achieved through the coaxial shielding architecture: the outer braid of the integral cable is bonded to the probe housing at the probe end and floated at the proximitor end, creating a single-point ground reference that rejects common-mode noise from adjacent power cables and variable-frequency drives — a critical design requirement in petrochemical and power generation environments where cable trays carry mixed signal and power conductors. The −24 VDC supply rail, sourced from the proximitor, is regulated and filtered, providing a stable excitation reference that maintains scale factor accuracy across the full operating temperature range without field adjustment.

System Integration Benefits

• Deterministic DC-coupled output: The analog voltage output (typically −2 to −18 VDC) is directly compatible with standard 4–20 mA transmitter input cards and high-resolution analog input modules on Siemens S7, ABB 800xA, Emerson DeltaV, and Honeywell Experion DCS platforms without signal conditioning hardware.
• Simultaneous static and dynamic measurement: A single probe channel resolves both shaft centerline position (DC component) and vibration amplitude (AC component) up to 10 kHz, eliminating the need for separate position and vibration transducers on the same bearing journal.
• API 670 compliance: The 3300 XL system meets the machinery protection standard for critical rotating equipment, enabling direct use in SIL-rated protection loops without additional validation testing when installed per the standard’s wiring and grounding requirements.
• Drop-in replacement without re-calibration: Identical form, fit, and function to OEM-installed units; replacing a like-for-like 330104-00-20-10-01-CN probe does not require system re-calibration, reducing planned maintenance downtime to the time required for mechanical installation and gap setting.
• Diagnostic transparency via gap voltage: The bias voltage at the proximitor output provides a continuous, real-time indication of probe-to-shaft gap. Deviations from the nominal −10.4 VDC mid-range value are immediately visible in the DCS historian, enabling predictive identification of bearing wear, shaft bow, or probe mounting drift before alarm thresholds are reached.
• Wide bandwidth for sub-synchronous detection: The DC–10,000 Hz frequency response captures sub-synchronous instabilities (oil whirl, oil whip) at fractional multiples of running speed — fault signatures that accelerometers mounted on bearing housings often attenuate due to structural transmission path losses.
• High-temperature operational margin: The 177 °C upper temperature rating provides a 40–60 °C margin above typical bearing pedestal temperatures in steam turbine hot sections, ensuring measurement integrity without probe cooling provisions in most standard installations.
• Hazardous area certification: ATEX certification supports installation in Zone 1 and Zone 2 classified areas common in refinery and offshore platform environments, with the CN marking confirming compliance with GB/T explosion protection standards for domestic Chinese installations.

Quality Assurance & Global Logistics

Every 330104-00-20-10-01-CN unit offered through this listing is sourced from authorized industrial distribution channels and verified OEM surplus inventory. Prior to dispatch, each probe undergoes a structured incoming inspection protocol: connector pin geometry and coaxial impedance continuity are verified with a calibrated LCR meter; the integral cable jacket is inspected for abrasion, kinking, or crush damage; the probe tip surface is examined under magnification for PEEK insert integrity; and the part number label and date code are recorded for full traceability documentation. Units that do not pass all inspection criteria are quarantined and excluded from sale.

Packaging follows anti-static and mechanical protection standards: each probe is individually sealed in an anti-static polyethylene bag, placed in a foam-lined rigid carton, and labeled with part number, serial number, and inspection date. Certificate of Conformance (CoC) documentation is available on request for critical applications requiring material traceability records. A 12-month warranty from the date of shipment covers manufacturing defects and functional failure under normal operating conditions.

Logistics operations are based in Xiamen, China. In-stock units are dispatched within 2–3 business days of order confirmation. Standard international shipping is via DHL Express or FedEx International Priority, with typical transit times of 3–5 business days to major industrial hubs in Europe, North America, Southeast Asia, and the Middle East. Full export documentation — commercial invoice, packing list, and certificate of origin — is provided with every shipment to facilitate customs clearance. Freight forwarding and consolidated shipment options are available for project-volume orders. Bulk pricing is available for quantities of 5 units or more; contact the sales team with your delivery schedule and quantity requirement for a project quotation.

Contact Information

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