Bently Nevada 102045-040-01 Proximity Probe – 3300 XL Series

Bently Nevada 102045-040-01 — Non-Contact Shaft Dynamics Measurement in API 670 Machinery Protection Loops

The Bently Nevada 102045-040-01 is an 8 mm eddy current proximity probe within the 3300 XL Proximity Transducer System — a three-component measurement chain (probe, extension cable, Proximitor® driver) that forms the primary sensing layer of API 670-compliant machinery protection systems. Its function is precise, continuous, non-contact measurement of the radial gap between probe tip and a conductive target shaft, translating mechanical displacement into a calibrated DC voltage signal that downstream monitors interpret as vibration amplitude, shaft centerline position, or differential expansion.

In a typical turbomachinery protection loop, the 102045-040-01 mounts in a drilled and tapped boss on the bearing housing, oriented radially at 90° X–Y pairs or axially for thrust measurement. The probe tip maintains a nominal 1.0 mm (40 mil) gap to the shaft surface. The Proximitor® driver — powered at −24 VDC — excites the probe coil at approximately 1.0 MHz, generating an oscillating electromagnetic field. When the conductive shaft surface enters this field, eddy currents are induced, loading the oscillator circuit and producing a proportional voltage shift. The output is a linear −4 VDC to −20 VDC signal across the calibrated measurement range, with a nominal sensitivity of 7.87 V/mm (200 mV/mil) for standard steel targets.

This architecture eliminates all mechanical contact with the rotating element, making the sensor immune to wear, lubrication state, and rotational speed. The probe operates from zero RPM through the highest speeds encountered in industrial turbomachinery, with a flat frequency response from DC to well above the 10 kHz bandwidth required by API 670 for dynamic vibration capture.

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Technical Parameters

Hardware Logical Analysis

The 102045-040-01 probe coil is wound on a ferrite core and encapsulated in a PEEK (polyether ether ketone) tip body — a material selected for its combination of dimensional stability across the full operating temperature range, chemical resistance to turbine oils and process gases, and low dielectric loss that preserves oscillator Q-factor. The coil geometry is precision-wound to achieve the tight sensitivity tolerance (±1% of nominal scale factor) required for system-level calibration without field adjustment.

The integral armored cable uses a coaxial construction with a low-loss dielectric and a braided shield terminated at both ends. This construction suppresses capacitive coupling from adjacent power cables and minimizes the effect of cable flexure on the oscillator circuit impedance — a critical consideration in installations where the cable routes through vibrating machinery structures. The shield is grounded at the Proximitor® driver end only, preventing ground loop currents that would appear as low-frequency noise on the output signal.

EMC performance is achieved through a combination of the coaxial cable shield, the Proximitor® driver’s internal filtering, and the high carrier frequency (≈1 MHz) of the oscillator circuit. At 1 MHz, the probe is inherently insensitive to 50/60 Hz power-frequency interference and its harmonics. The differential measurement architecture of the Proximitor® driver further rejects common-mode noise picked up along the cable run. In practice, the system achieves a noise floor below 25 μm pk-pk in typical industrial installations, sufficient to resolve sub-synchronous vibration components at amplitudes well below alarm thresholds.

The probe body thread (M10 × 1.0 standard) and lock nut interface are machined to tight tolerances, ensuring repeatable probe-to-housing positioning after maintenance reinstallation. This mechanical repeatability is essential in systems where the gap voltage is used as an absolute position reference for shaft centerline analysis — any axial shift of the probe during reinstallation would introduce a DC offset error indistinguishable from a genuine shaft position change.

System Integration Benefits

• Deterministic signal latency: The analog voltage output of the 102045-040-01 reaches the monitor input with propagation delay determined only by cable length (≈5 ns/m), enabling the 3500 Series monitor to execute protection logic within its 20 ms voting cycle without sensor-introduced jitter.
• Direct API 670 compliance: The probe, when paired with a matched 3300 XL extension cable and Proximitor® driver, constitutes a factory-calibrated transducer system that satisfies API 670 Section 5 transducer requirements without additional field calibration — reducing commissioning time on new installations.
• Plug-compatible with 3500 Series monitors: The −4 to −20 VDC output maps directly to the input range of Bently Nevada 3500/40M, 3500/42M, and 3500/45 monitor cards, enabling straightforward replacement of legacy probes without reconfiguring monitor scale factors.
• Shaft centerline analysis support: The DC component of the output signal carries absolute gap information, allowing the 3500 monitor to compute shaft centerline position plots — a diagnostic tool for detecting bearing wear, misalignment, and changes in oil film stiffness over time.
• Dual-use measurement: A single 102045-040-01 installed axially on a thrust collar serves simultaneously as a thrust position sensor and an axial vibration transducer, reducing the total probe count in compact bearing housings.
• Redundancy architecture compatibility: The probe’s passive coil design allows two probes to share a single Proximitor® driver in certain redundant configurations, supporting 1oo2 voting logic in safety-instrumented machinery protection systems without doubling the driver count.
• Diagnostic transparency via gap voltage monitoring: Continuous monitoring of the DC gap voltage by the 3500 monitor provides real-time detection of probe-to-shaft contact, probe tip fouling, or cable open-circuit faults — all of which shift the gap voltage outside the calibrated linear range and trigger a transducer not OK (TNK) alarm before a false vibration reading can cause a spurious trip.
• Wide target material database: Bently Nevada publishes correction factors for over 40 common shaft alloys, allowing the 102045-040-01 to be recalibrated for stainless steel, titanium, or Inconel shafts without hardware changes — a significant advantage in multi-material rotor trains found in aerospace test rigs and specialty compressors.

Quality Assurance & Global Logistics

Every Bently Nevada 102045-040-01 unit supplied by siemensplc.com is sourced through verified industrial surplus and authorized distribution channels with full part traceability. Prior to dispatch, each probe undergoes a structured inspection protocol: visual examination of the PEEK tip for mechanical damage, connector pin integrity check, coaxial cable continuity and shield resistance measurement, and where test equipment permits, oscillator loading verification against the published sensitivity specification.

Units are packaged in anti-static foam-lined enclosures with moisture-barrier desiccant packs, meeting ISTA 2A transit testing requirements for international air freight. Export documentation — including commercial invoice, packing list, and certificate of origin — is prepared in compliance with Chinese customs regulations and the import requirements of the destination country. HS Code 9031.80 applies to eddy current proximity transducers for most jurisdictions.

Shipments originate from our warehouse in Xiamen, China. Standard express delivery via DHL Express, FedEx International Priority, or UPS Worldwide Express reaches most destinations in Asia within 2–3 business days, Europe in 3–5 business days, and the Americas in 4–6 business days. Freight-on-board (FOB Xiamen) and CIF terms are available for larger orders. All shipments include a tracking number issued within 24 hours of dispatch. The 12-month warranty covers manufacturing defects and calibration drift beyond published tolerance; field damage and incorrect installation are excluded per standard terms.

Contact Information

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