Bently Nevada 330102-00-70-10-02-05 Proximity Probe – 3300 XL Series

Bently Nevada 330102-00-70-10-02-05 — 8 mm Eddy-Current Proximity Probe with 5 m Armored Cable

The 330102-00-70-10-02-05 is an 8 mm eddy-current proximity probe manufactured by Bently Nevada (a Baker Hughes business) as part of the 3300 XL Proximity Transducer System. It is engineered for continuous, non-contact measurement of shaft radial vibration, axial position, differential expansion, and eccentricity in rotating machinery operating under API 670 machinery protection requirements. The probe ships with a 5 m (16.4 ft) factory-terminated, armored coaxial cable and a 10-32 UNF connector, forming the first stage of a three-component transducer chain: probe → extension cable → Proximitor® sensor.

In a control loop context, this probe functions as the primary sensing element that converts mechanical displacement into a proportional DC voltage. The Proximitor® driver oscillates at approximately 1.0 MHz, inducing eddy currents in the conductive target shaft. As the air gap between probe tip and shaft surface changes, the reflected impedance modulates the oscillator, and the driver demodulates this signal into a calibrated output of −200 mV/mil (−7.87 V/mm). This analog voltage feeds directly into Bently Nevada 3500 series monitors or third-party DCS/PLC analog input cards, enabling real-time vibration trending, alarm setpoint enforcement, and machinery trip logic with sub-millisecond latency.

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Technical Parameters

Hardware Logical Analysis

The 330102-00-70-10-02-05 probe body houses a precision-wound sensing coil embedded in a thermoplastic tip, potted with epoxy compound rated to 177 °C. The coil geometry is optimized for an 8 mm active diameter, producing a focused electromagnetic field with a depth of penetration of approximately 0.5 mm into AISI 4140 steel at the nominal 1.0 MHz oscillation frequency. This shallow penetration depth is intentional: it maximizes sensitivity to surface displacement while minimizing sensitivity to subsurface metallurgical variation.

The 5 m armored cable assembly uses a low-loss coaxial construction with PTFE dielectric (εr ≈ 2.1), maintaining characteristic impedance within ±2 Ω across the full operating temperature range. The stainless steel armor braid provides mechanical protection against abrasion and crush loads in turbine bearing pedestals, while simultaneously acting as an EMC shield. The shield is grounded at the Proximitor® end only (single-point grounding), preventing ground-loop currents that would appear as low-frequency noise on the vibration signal — a critical design choice in environments with high-power motor drives and variable-frequency drives (VFDs) generating common-mode interference at 2–20 kHz.

The part-number suffix “-02” denotes the armored cable variant, distinguishing it from the “-00” unarmored version. The final “-05” encodes the standard temperature rating; high-temperature variants (“-HT”) extend operation to 260 °C for steam turbine exhaust-end bearing applications. The probe tip thread (M10 × 1.0) mates with standard Bently Nevada probe holders and lock nuts, allowing installation gap adjustment in 0.1 mm increments without disturbing the cable routing.

From an EMC standpoint, the probe assembly complies with IEC 61000-4-3 (radiated immunity, 10 V/m) and IEC 61000-4-6 (conducted immunity, 10 V RMS). The ATEX certification (II 2G Ex ia IIC T4) permits installation in Zone 1 hazardous areas with intrinsically safe barriers, making the probe suitable for gas compressor trains in petrochemical facilities where flammable atmospheres may be present during maintenance windows.

System Integration Benefits

• Direct API 670 compliance: The 3300 XL system is the reference transducer in API 670 (5th edition) Annex D, eliminating the need for third-party calibration validation during machinery protection system commissioning audits.
• Deterministic analog output: The −200 mV/mil sensitivity is factory-calibrated with ±1% accuracy, allowing DCS analog input cards to apply a fixed engineering-unit conversion without field trimming, reducing commissioning time per measurement point by 30–45 minutes.
• Broad frequency bandwidth: DC to 10,000 Hz response captures both low-speed eccentricity (1× running speed at 600 RPM = 10 Hz) and high-frequency blade-pass events (10× at 6,000 RPM = 1,000 Hz) within a single channel, eliminating the need for separate sensors per frequency band.
• Single-point shield grounding: Eliminates ground-loop interference in multi-drive environments, maintaining signal integrity at gap voltages as low as −2 VDC without additional filtering hardware.
• ATEX Zone 1 certification: Allows direct installation in hazardous areas without additional enclosure or purging, reducing installation material cost by eliminating Ex d junction boxes at each probe location.
• Standardized connector interface: The 10-32 UNF coaxial connector is compatible with all Bently Nevada 330180/330181 extension cables, enabling cable-length changes in the field without probe replacement — a significant advantage during plant turnarounds where cable routing is modified.
• Diagnostic transparency via gap voltage: The DC component of the Proximitor® output provides a continuous gap voltage reading (nominal −10 VDC at mid-range). Trending this value in the DCS historian allows early detection of probe fouling, shaft wear, or probe holder loosening before vibration amplitude alarms are triggered.
• Thermal stability across process extremes: The PTFE-insulated cable maintains dielectric integrity from −35 °C to +177 °C, covering the full operating envelope of steam turbine bearing pedestals without signal drift exceeding ±0.5% of full scale across the temperature range.

Quality Assurance & Global Logistics

Every 330102-00-70-10-02-05 unit supplied by siemensplc.com is sourced through verified Bently Nevada / Baker Hughes authorized distribution channels. Each probe assembly arrives in original OEM anti-static packaging with the serialized part-number label intact and an accompanying certificate of conformance traceable to the manufacturing lot. Prior to dispatch, our technical team performs a visual inspection of the probe tip, cable armor, and connector for transit damage, and verifies the part number label against the purchase order.

Shipments originate from our warehouse in Xiamen, China, a major international logistics hub with direct air freight connections to Singapore, Dubai, Frankfurt, Los Angeles, and Houston. Standard in-stock orders are dispatched within 1–3 business days via DHL Express, FedEx International Priority, or UPS Worldwide Expedited, with typical transit times of 3–5 business days to Europe and North America. For urgent plant-shutdown requirements, same-day dispatch is available on confirmed orders received before 14:00 CST. Customs documentation — including commercial invoice, packing list, and HS code declaration (HS 9031.80) — is prepared in compliance with destination-country import regulations to minimize clearance delays.

All units carry a 12-month warranty against manufacturing defects from the date of shipment. Warranty claims are processed with a target response time of 48 hours. NIST-traceable calibration reports are available on request for applications requiring documented measurement uncertainty budgets.

Contact Information

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