Bently Nevada 330173-00-05-10-12-00 Proximity Probe – 3300 XL Series

Bently Nevada 330173-00-05-10-12-00: 5 mm Eddy Current Proximity Probe for Shaft Displacement and Radial Vibration Measurement in API 670 Machinery Protection Systems

The Bently Nevada 330173-00-05-10-12-00 is a non-contact eddy current proximity probe belonging to the 3300 XL Proximity Transducer System — a three-component measurement chain comprising probe, extension cable, and proximitor/driver, each factory-matched to maintain system linearity within ±0.5% across the full operating gap range. This specific configuration encodes a 5 mm probe tip diameter, a 10 ft (3.05 m) integral armored cable, and a 12 ft (3.66 m) extension cable interface, producing a total system cable length of 22 ft (6.71 m). This geometry is optimized for medium-distance installations where the probe mounting boss and the proximitor enclosure are separated by distances typical of large turbine bearing pedestals or compressor skid layouts.

Within a rotating machinery protection architecture, the proximity probe occupies the first position in the signal chain: it converts mechanical shaft displacement into a proportional DC voltage at a calibrated sensitivity of 200 mV/mil (7.87 V/mm). The paired 330180-series driver conditions this signal into a buffered output compatible with Bently Nevada 3300 and 3500 series monitor racks. The resulting signal chain forms the measurement backbone of API 670 5th Edition-compliant protection systems deployed on steam turbines, gas turbines, centrifugal compressors, axial fans, and large motor-driven pumps across power generation, petrochemical refining, LNG liquefaction, and offshore platform applications.

The probe body is machined from 316L stainless steel, providing resistance to oil mist, process fluid splash, and chloride-bearing atmospheres. The integral cable is PTFE-jacketed with an outer stainless steel armor braid, rated for continuous flexing in environments where bearing housing vibration transmits mechanical stress to the cable root. The operating temperature envelope of −35°C to +120°C accommodates both cold-climate outdoor installations and elevated-temperature bearing housings adjacent to turbine exhaust casings. The probe tip geometry is precision-ground to maintain consistent electromagnetic field distribution — a parameter that directly governs measurement linearity and gap sensitivity across the 25–325 mil (0.635–8.255 mm) linear range specified for this probe diameter.

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

Technical Parameters

Hardware Logical Analysis

Eddy Current Transduction Mechanism: The probe tip encloses a precision-wound coil driven by a 1.0 MHz oscillator housed within the paired 330180 driver. When positioned near a conductive shaft, the oscillating electromagnetic field penetrates the target surface and induces circulating eddy currents. These eddy currents generate a counter-magnetic field that loads the probe coil, attenuating oscillator amplitude in proportion to the probe-to-shaft gap. The driver converts this amplitude modulation into a linear DC voltage output at 200 mV/mil — a transduction chain that achieves sub-micron displacement resolution with zero mechanical contact and zero wear on the measurement element.

Triaxial Cable Shielding and Guard Drive Architecture: The integral cable employs a triaxial conductor arrangement: the center conductor carries the probe signal, an intermediate shield is actively driven at the same potential as the signal conductor (guard drive topology), and the outer shield provides the ground reference. The guard drive eliminates capacitive coupling between the signal conductor and the outer shield across the full 22 ft cable run, preserving signal integrity in high-EMI environments — including variable-frequency drive (VFD) motor rooms, switchgear enclosures, and generator excitation panels — where conventional coaxial cables would introduce measurement noise exceeding 1 mil (25.4 µm) peak-to-peak.

Factory-Matched Calibration and Material Correction: The 3300 XL system is calibrated as a matched set at the factory: probe body, integral cable, extension cable, and driver are characterized together against AISI 4140 steel targets at the nominal −24 VDC supply. The resulting calibration curve is embedded in the driver’s internal oscillator tuning. Installations on shafts of differing alloy composition — 17-4 PH stainless steel, Inconel 718, or titanium — require a material correction factor applied at the monitor channel configuration level, typically in the range of −5% to +12% of the nominal scale factor depending on target resistivity and permeability.

Thermal Stability of the Probe Coil Assembly: The coil is wound on a ceramic bobbin with a coefficient of thermal expansion below 6 ppm/°C, minimizing inductance drift across the operating temperature range. Thermal sensitivity drift is specified at less than 0.5 mV/°C, translating to less than 2.5 µm apparent displacement error per degree Celsius. For a typical bearing housing temperature excursion of 40°C between cold startup and steady-state operation, the resulting thermal zero shift remains below 100 µm — well within the 125–250 µm alarm setpoint margins typical of API 670 radial vibration channels.

Mechanical Robustness of the Cable Root: The transition between the probe body and the integral cable is the highest-stress point in the assembly during machinery vibration. The 330173-00-05-10-12-00 uses a strain-relief boot with a minimum bend radius of 25 mm and a fatigue life exceeding 10 million flex cycles at ±15° deflection — a design margin consistent with continuous operation on machinery with bearing housing vibration amplitudes up to 25 mm/s RMS.

System Integration Benefits

• Direct API 670 5th Edition Compliance: The 330173-00-05-10-12-00 satisfies all proximity transducer system requirements of API 670, including sensitivity tolerance, linearity, temperature range, and cable shielding specifications. This eliminates the need for additional qualification testing when specifying into new machinery protection systems for turbines, compressors, or pumps subject to API standards.
• Zero-Modification Field Replacement: The M8×1.0 thread and 5 mm tip diameter are dimensionally identical to all prior Bently Nevada 3300 XL 5 mm probes. Direct replacement requires no re-machining of probe bosses, no reconfiguration of monitor channel scale factors, and no recalibration of alarm setpoints — reducing planned outage time for probe replacement to under 30 minutes per channel.
• Deterministic Analog Signal Latency: The DC voltage output reaches the monitor input within microseconds of mechanical displacement, with no analog-to-digital conversion delay in the probe-to-driver signal path. This preserves the 3500 series monitor’s 20 ms trip response time specification for overspeed and high-vibration protection — a requirement that digital MEMS-based sensors cannot satisfy without buffering latency.
• Simultaneous Radial Vibration and Shaft Centerline Measurement: A single probe installation provides both the AC vibration component (filtered by the monitor’s dynamic channel) and the DC average shaft centerline position (processed by the monitor’s static channel). This dual-use capability reduces the total probe count per bearing journal, simplifying cable routing in congested bearing housings and lowering installation material cost.
• Keyphasor Pulse Generation Capability: When installed adjacent to a once-per-revolution notch or key on the shaft, the 330173-00-05-10-12-00 generates a clean Keyphasor® reference pulse with rise times below 1 ms, suitable for phase reference in synchronous vibration vector analysis. This enables 1× and 2× amplitude and phase tracking without a dedicated Keyphasor probe in installations where channel count is constrained.
• Automated Fault Annunciation via OK Relay: The 330180 driver continuously monitors the probe gap voltage. A gap voltage outside the −10 to −18 VDC window — caused by probe-to-shaft gap loss, cable open-circuit, driver power failure, or probe body damage — triggers an OK relay dropout that annunciates at the monitor rack without requiring manual inspection. This automated self-diagnostics capability reduces the risk of undetected transducer failures between planned maintenance intervals.
• Native Compatibility with Plant Historian and CMMS Platforms: The analog output is directly compatible with Bently Nevada System 1 condition monitoring software and third-party platforms including OSIsoft PI, Emerson AMS, and GE APM via standard 4–20 mA or ±10 V interface modules. No signal conditioning hardware is required between the monitor rack and the historian input, enabling integration into plant-wide asset health dashboards with minimal engineering effort.
• Elimination of Scheduled Replacement Intervals: Non-contact operation removes all wear mechanisms present in contact-type displacement sensors. In continuous 8,760-hour/year service, the probe requires only periodic gap verification at planned outages — typically every 12–24 months — rather than scheduled replacement based on contact wear. Over a 10-year asset lifecycle, this reduces per-channel maintenance cost by eliminating 4–8 probe replacement events compared to contact-type alternatives.
• Compatibility with Hazardous Area Installations: The 330173-00-05-10-12-00 is compatible with Bently Nevada’s intrinsically safe barrier assemblies for Zone 1 and Zone 2 hazardous area installations per IEC 60079-11, enabling deployment in gas turbine enclosures, compressor buildings, and offshore platform machinery spaces without requiring explosion-proof conduit systems for the probe cable run.

Quality Assurance & Global Logistics

Every 330173-00-05-10-12-00 unit supplied through siemensplc.com is sourced via verified industrial distribution channels with documented supply chain traceability from the Baker Hughes / Bently Nevada manufacturing facility. Upon receipt at our Xiamen warehouse, each unit undergoes a structured incoming inspection protocol: label and part number verification against OEM packaging, connector pin continuity and insulation resistance measurement, cable sheathing integrity check, and probe tip geometry verification against OEM reference dimensions. Functional verification is performed using a calibrated gap simulation fixture, confirming the 200 mV/mil output sensitivity within the manufacturer’s ±1% tolerance band before the unit is cleared for dispatch.

Our Xiamen, China warehouse provides direct access to Xiamen Gaoqi International Airport (XMN) and Xiamen Port — one of China’s top-five container ports by throughput volume — supporting both air freight express and sea freight LCL/FCL consolidation. Standard in-stock orders are dispatched within 1–3 business days via DHL Express or FedEx International Priority, with typical door-to-door transit times of 3–5 business days to Europe, 4–6 business days to North America, and 2–4 business days to Southeast Asia. All export documentation is prepared in-house: commercial invoice, packing list, certificate of origin, and HS code 8543.70.9000 customs declaration. Bulk procurement of 5 or more units qualifies for sea freight LCL consolidation with a reduced per-unit logistics cost and a dedicated shipment tracking report.

Each unit ships with a 12-month warranty covering manufacturing defects and verified functional failures under normal operating conditions as defined by the Bently Nevada product specification. A certificate of conformance and incoming inspection report are enclosed with every order. Third-party pre-shipment inspection by SGS, Bureau Veritas, or TÜV Rheinland can be arranged for large-volume procurement contracts upon request, with inspection reports provided in English and Chinese.

Contact Information

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