Bently Nevada 330910-00-11-10-02-05 Proximity Probe – 3300 XL Series

Bently Nevada 330910-00-11-10-02-05 — 8 mm Eddy-Current Proximity Probe in the 3300 XL Transducer System

The 330910-00-11-10-02-05 is a non-contact, eddy-current proximity probe manufactured by Bently Nevada (a Baker Hughes company) as the primary sensing element of the 3300 XL 8 mm Transducer System. It measures radial shaft vibration and axial rotor position on critical rotating machinery — steam turbines, centrifugal compressors, gearboxes, and large electric motors — where continuous, API 670-compliant machinery protection is mandatory. The probe operates within a three-component measurement chain: the 330910 probe body, a 330130 extension cable, and a 330180 proximitor/oscillator. Each element is factory-matched to maintain a calibrated scale factor of 7.87 V/mm (200 mV/mil) across the full linear range without field adjustment.

The suffix string -00-11-10-02-05 encodes specific configuration parameters: standard armored cable, 5-metre total cable length, M10 × 1.0 thread form, and standard temperature rating. Procurement engineers must verify the complete suffix against the bill of materials before ordering, as each position in the code affects mechanical fit, electrical performance, and hazardous-area certification status.

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

Technical Parameters

Hardware Logical Analysis

The 330910 probe body functions as a passive LC resonant circuit. An oscillator inside the 330180 proximitor drives a high-frequency carrier signal — typically in the range of 1.0 MHz to 1.5 MHz — through the coaxial cable to the probe coil. When a conductive target enters the electromagnetic field generated at the probe tip, eddy currents are induced on the target surface. These eddy currents load the probe coil, reducing its effective Q-factor and shifting the resonant impedance of the circuit. The proximitor demodulates this impedance change into a calibrated DC voltage output proportional to the gap distance between probe tip and target surface.

EMC Design: The stainless steel armored braid surrounding the coaxial cable provides a continuous Faraday shield from the probe body to the proximitor input. This construction attenuates capacitively coupled interference from adjacent power cables and motor drives, which is critical in congested cable trays near variable-frequency drives (VFDs) operating at switching frequencies of 2–16 kHz. The coaxial geometry also rejects common-mode noise that would otherwise appear as false vibration amplitude on the monitor card.

Thermal Stability: The probe coil is wound on a ceramic bobbin with a low coefficient of thermal expansion. This minimizes coil geometry change across the –35 °C to +177 °C operating envelope, keeping scale factor drift within ±1% of nominal across the full thermal range. In hot-section turbine pedestals where bearing housing temperatures routinely exceed 120 °C, this thermal stability eliminates the need for external thermal isolation hardware that older probe designs required.

DC-Coupled Output Architecture: Unlike AC-coupled vibration sensors (accelerometers, velocity transducers), the eddy-current output is DC-coupled. This means a single channel simultaneously carries the static gap voltage (DC component, representing rotor position) and the dynamic vibration signal (AC component, representing shaft displacement amplitude). Monitor cards such as the Bently Nevada 3500/40M and 3500/42M separate these two components internally — the DC gap is used for position alarming and the AC component feeds the vibration measurement circuitry. This dual-function architecture reduces sensor count per measurement point by 50% compared to systems requiring separate position and vibration transducers.

Calibration Chain Integrity: The 330910 probe, 330130 extension cable, and 330180 proximitor are factory-matched as a system. The proximitor’s internal trimming resistors are adjusted at the factory to compensate for the specific impedance characteristics of the paired probe and cable, achieving a system scale factor accuracy of ±1% at 25 °C. Field-mixing components from different serial number batches without recalibration can introduce scale factor errors of 3–8%, which translates directly into false alarm or missed-trip conditions in API 670 protection systems.

System Integration Benefits

• Zero mechanical wear on the measurement path — the non-contact sensing principle means probe performance does not degrade with shaft rotation cycles. There is no contact force, no friction, and no lubrication requirement at the sensing interface, giving the probe an indefinite service life under normal operating conditions.
• Deterministic real-time response to 10 kHz — the DC-to-10,000 Hz frequency response captures shaft dynamic events including subsynchronous instability (oil whirl at 0.43–0.48× running speed), synchronous imbalance, and high-frequency gear mesh components without aliasing or phase lag introduced by mechanical resonance.
• Direct compatibility with Bently Nevada 3500 Series monitor racks — the –2 V to –18 VDC output maps directly to the input range of 3500/40M, 3500/42M, and 3500/45 monitor cards. No signal conditioning adapter or range converter is required, preserving the calibrated measurement chain from probe tip to monitor display.
• API 670 alarm and trip logic support — the calibrated scale factor and defined linear range allow monitor cards to set absolute vibration alarm levels (e.g., 50 µm pk-pk alert, 75 µm pk-pk danger) and gap position alarms with engineering-unit accuracy, satisfying API 670 Section 5 requirements for machinery protection systems.
• Simultaneous position and vibration measurement on one channel — the DC-coupled output eliminates the need for a separate position sensor at each measurement plane, reducing wiring complexity, terminal block count, and monitor card slot consumption in the protection rack.
• Drop-in replacement for legacy 330900 series — the 330910 XL series maintains identical mechanical dimensions (thread form, probe body diameter, connector geometry) and electrical interface as the 330900 series. Replacement requires no modification to the mounting boss, cable routing, or monitor configuration, minimizing planned maintenance downtime.
• IP67 ingress protection for wet and contaminated environments — the probe body withstands direct water jet exposure and temporary immersion, making it suitable for installation in bearing housings with oil mist, steam condensate, or wash-down exposure without additional protective enclosures.
• Diagnostic transparency through gap monitoring — the static DC gap voltage provides continuous bearing clearance data. Trending the gap over time reveals bearing wear, thermal growth of the rotor, and changes in alignment — diagnostic information that is invisible to AC-only vibration sensors and that supports condition-based maintenance scheduling.

Quality Assurance & Global Logistics

Every 330910-00-11-10-02-05 unit offered through siemensplc.com is sourced from authorized distribution channels or verified OEM surplus inventory with full lot traceability. Physical inspection covers connector pin geometry, cable armor continuity, probe tip surface condition, and part marking verification against Bently Nevada OEM reference standards to mitigate counterfeit risk — a documented concern in the industrial automation aftermarket.

Documentation available on request includes calibration certificates, material certificates, country-of-origin letters, and ATEX conformity declarations for applicable suffix variants. Lot traceability records are retained for a minimum of five years.

Shipments originate from our warehouse in Xiamen, China via DHL Express, FedEx International Priority, or UPS Worldwide Expedited. In-stock units typically ship within 24–48 hours of order confirmation. Export terms are EXW Xiamen; CIF and DAP terms available for volume orders. Customs documentation — commercial invoice, packing list, and HS code declaration — is prepared to minimize clearance delays at destination ports. Emergency AOG-equivalent expedite service is available for unplanned outage situations; contact us directly to discuss lead time and freight options.

All shipments carry a 12-month warranty from the date of shipment against manufacturing defects. Warranty claims are processed with replacement unit dispatch within 5 business days of defect confirmation.

Contact Information

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