Bently Nevada 330180-X2-05 Proximity Sensor – 3300 XL Series

Bently Nevada 330180-X2-05 — 8 mm Eddy Current Proximity Probe in the 3300 XL Transducer System

The 330180-X2-05 is an 8 mm eddy current proximity probe manufactured by Bently Nevada (a Baker Hughes company) as part of the 3300 XL Proximity Transducer System. It operates on the principle of electromagnetic induction: a high-frequency oscillator drives an LC tank circuit at the probe tip, and the presence of a conductive target surface attenuates the oscillation amplitude in direct proportion to the air gap. The Proximitor sensor downstream converts this attenuation into a DC voltage output, yielding a continuous, non-contact measurement of shaft radial position and dynamic vibration displacement.

Within a rotating machinery protection architecture, this probe occupies the first stage of the signal chain — the point at which mechanical motion is transduced into an electrical signal. Its accuracy at this stage determines the fidelity of every downstream alarm, trip, and trend record. The 330180-X2-05 is designed to maintain a scale factor of 200 mV/mil (7.87 V/mm) across its full linear range, ensuring that the monitor rack receives a calibrated, low-noise signal regardless of ambient temperature variation or electromagnetic interference from adjacent drive systems.

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Technical Parameters

Hardware Logical Analysis

The 330180-X2-05 probe tip houses a precision-wound coil embedded in a thermally stable epoxy matrix. The coil forms the inductive element of an LC oscillator circuit whose resonant frequency is nominally 1 MHz. When the probe tip approaches a conductive target, eddy currents are induced on the target surface, loading the coil and reducing the Q-factor of the tank circuit. The Proximitor sensor — connected via the integral 5 ft cable — demodulates this amplitude change and outputs a proportional DC voltage.

EMC Design: The coaxial cable construction between probe and Proximitor provides inherent shielding against capacitively coupled interference. The shield is grounded at the Proximitor end only, forming a single-point ground that prevents shield current loops — a common source of 50/60 Hz noise in proximity measurement systems. The probe housing is constructed from 316 stainless steel, which provides mechanical shielding against low-frequency magnetic fields without introducing ferromagnetic permeability errors into the measurement.

Thermal Stability: The -X2- designation in the part number indicates an extended temperature range coil winding with a low-temperature coefficient of inductance. This is achieved through the selection of a ceramic coil former with a controlled thermal expansion coefficient matched to the winding wire, maintaining scale factor drift below ±0.5% across the full −35 °C to +177 °C operating envelope. In high-temperature steam turbine bearing housings where ambient temperatures routinely exceed 120 °C, this thermal compensation is a prerequisite for API 670 compliance.

Cable Integrity: The integral 5 ft cable eliminates the field-assembled connector junction between probe and extension cable — a junction that is a known failure point in harsh environments due to moisture ingress and fretting corrosion. The integral design maintains a continuous, factory-terminated coaxial path from the probe coil to the Proximitor input, preserving the calibrated impedance of the measurement loop. The cable jacket is rated to 121 °C continuous, with a fluoropolymer inner insulation layer that resists hydrocarbon fluid absorption in oil-wetted bearing environments.

Mechanical Mounting: The probe body is threaded M10 × 1.0 mm, compatible with standard Bently Nevada probe holders. The thread pitch is fine enough to allow precise gap adjustment in 25 µm increments per degree of rotation, enabling field calibration of the initial gap voltage to the nominal −10 VDC midpoint without special tooling.

System Integration Benefits

• Direct API 670 compliance: The 330180-X2-05 is a listed component in the Bently Nevada 3300 XL system, which is certified to API 670 4th Edition. Specifying this probe eliminates the need for third-party calibration records when commissioning a new machinery protection system under API 670 audit requirements.
• Deterministic signal latency: The eddy current transduction mechanism has no moving parts and no mechanical hysteresis. Signal propagation from shaft motion to Proximitor output is limited only by the LC oscillator settling time, which is less than 100 µs — well within the response time budget of any 3500 Series monitor configured for 1× or 2× vibration tracking.
• Plug-and-play compatibility with 3500 rack: The probe, when paired with the 330180 Proximitor, presents a calibrated −10 VDC output at the nominal 50 mil (1.27 mm) gap. The 3500/40M and 3500/42M monitors accept this signal directly without requiring input scaling adjustments, reducing commissioning time and eliminating transcription errors in monitor configuration.
• Diagnostic transparency via gap voltage monitoring: The DC component of the Proximitor output is a direct indicator of the physical probe-to-shaft gap. Monitoring this DC level over time provides early warning of probe loosening, shaft centerline migration, or bearing wear — failure modes that are invisible to vibration-only monitoring strategies.
• Redundant measurement architecture support: The 3300 XL system supports dual-probe configurations on a single shaft journal. The 330180-X2-05 can be installed in a 90° X-Y orientation pair, enabling the 3500 monitor to compute orbital plots and distinguish between synchronous (unbalance) and non-synchronous (instability, rub) vibration components.
• Minimal installation footprint: The 8 mm probe diameter requires a bore of only 10.5 mm in the bearing housing, compared to 14 mm for 11 mm probes. This smaller footprint is significant in retrofitting existing machinery where bearing housing real estate is constrained by original OEM design.
• Long-term calibration stability: The factory-calibrated scale factor of 200 mV/mil is traceable to NIST standards. Field experience on gas turbine applications demonstrates scale factor drift of less than ±2% over a 5-year continuous service interval, reducing the frequency of required recalibration outages.
• Broad fluid compatibility: The fluoropolymer cable insulation and 316 stainless steel housing are resistant to turbine lube oil, synthetic ester fluids, and steam condensate. This chemical compatibility eliminates the need for probe sleeve protectors in most turbomachinery lube oil environments, simplifying installation and reducing spare parts inventory.

Quality Assurance & Global Logistics

Every Bently Nevada 330180-X2-05 unit dispatched from our Xiamen, China facility is a genuine OEM component sourced through verified industrial supply channels. Each unit undergoes a structured pre-shipment verification protocol: physical inspection of the probe housing, connector, and cable jacket against factory reference standards; impedance measurement of the probe coil to confirm it falls within the factory-specified tolerance band; and label authentication against Bently Nevada serialization records where available.

Export packaging is engineered for the transit stresses of international air freight: the probe is individually wrapped in anti-static foam, sealed in a moisture-barrier poly bag with desiccant, and packed in a rigid corrugated carton with 50 mm foam cushioning on all six faces. This packaging standard is maintained regardless of order quantity, from single-unit emergency replacements to multi-unit project orders.

Logistics are executed via DHL Express, FedEx International Priority, and UPS Worldwide Express, with typical transit times of 3–5 business days to Europe, 2–4 business days to Southeast Asia, and 4–7 business days to the Americas. A commercial invoice, packing list, and certificate of origin are provided with every shipment to facilitate customs clearance. For orders requiring a certificate of conformance or material test report, these documents are prepared upon request prior to dispatch.

The 12-month warranty covers manufacturing defects and functional failures under normal operating conditions. Warranty claims are processed within 5 business days of receipt of the returned unit, with replacement or credit issued upon confirmation of the defect.

Contact Information

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