Bently Nevada 32000-28-05-15-080-03-02 Proximity Probe Assembly – 3300 XL Series

Bently Nevada 32000-28-05-15-080-03-02 — Eddy-Current Proximity Probe Housing Assembly for 3300 XL Machinery Protection Systems

The 32000-28-05-15-080-03-02 is a factory-configured proximity probe housing assembly manufactured by Bently Nevada for deployment within the 3300 XL Series continuous machinery monitoring platform. This assembly functions as the primary sensing element in a three-component eddy-current measurement chain, converting shaft-to-probe gap variations into a calibrated DC voltage signal that feeds directly into 3300 XL monitor cards for vibration amplitude, phase reference, and DC gap evaluation.

In rotating machinery protection architectures — turbines, centrifugal compressors, pumps, and generators — the proximity probe is the first transducer in the signal chain. Its mechanical integrity, thermal stability, and electromagnetic linearity determine the accuracy of every downstream alarm and shutdown decision. The 32000-28-05-15-080-03-02 is engineered to maintain measurement fidelity under continuous 24/7 operation in environments characterized by oil mist, process fluid ingress, mechanical shock, and ambient temperatures exceeding 150°C at the probe tip.

This assembly is fully compatible with Bently Nevada Proximitor® oscillator-demodulator drivers and integrates without signal chain recalibration into existing 3300 XL rack installations. It meets the dimensional and electrical requirements of API 670, the international standard governing machinery protection systems for petroleum, petrochemical, and natural gas industries.

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Technical Parameters

Hardware Logical Analysis

The eddy-current proximity probe operates on the principle of electromagnetic induction. The probe tip contains a wound coil driven by a high-frequency oscillator (typically 1.0 MHz carrier frequency in the 3300 XL driver circuit). When the probe tip is positioned within its linear range of a conductive target surface, the oscillating magnetic field induces circulating eddy currents in the target material. These eddy currents generate a counter-magnetic field that loads the oscillator circuit, reducing its amplitude in direct proportion to the probe-to-target gap distance.

The Proximitor® driver demodulates this amplitude-modulated carrier signal and outputs a calibrated DC voltage: at maximum gap (2.54 mm / 100 mil), output is approximately −20 VDC; at minimum gap (0.25 mm / 10 mil), output approaches −4 VDC. The 7.87 V/mm sensitivity figure is maintained within ±1% across the linear range when the target material matches the AISI 4140 reference standard.

EMC Design: The 316 stainless steel housing provides a continuous Faraday shield around the coil assembly, attenuating external RF interference that would otherwise modulate the carrier signal and introduce measurement noise. The coaxial cable geometry — with the signal conductor surrounded by a grounded braid — maintains signal integrity over the 5 m cable run, suppressing common-mode noise induced by adjacent power cabling in industrial panel environments.

Thermal Stability: The coil winding uses a temperature-compensated formulation that maintains inductance within specification across the −35°C to +177°C probe tip range. This is critical in steam turbine bearing housings where ambient temperatures at the probe mounting boss can exceed 120°C during normal operation. Without thermal compensation, inductance drift would shift the output voltage baseline, introducing a false DC gap offset that could mask actual shaft position changes.

Mechanical Robustness: The probe tip is hermetically sealed with a ceramic-filled epoxy compound rated for continuous immersion in turbine lube oil and process condensate. The stainless steel armored cable jacket resists abrasion from cable routing through conduit and provides mechanical protection against vibration-induced fatigue at the probe body junction — a common failure mode in long-service installations.

System Integration Benefits

• Direct 3300 XL Rack Compatibility: The assembly’s electrical characteristics — bias voltage, sensitivity, and output impedance — are matched to the 3300 XL monitor card input specifications, eliminating the need for signal conditioning adapters or impedance matching networks.
• Zero-Recalibration Replacement: Factory calibration to the 7.87 V/mm standard means the assembly can replace an in-service probe without requiring a system-level recalibration cycle, reducing planned maintenance downtime from hours to minutes.
• API 670 Alarm Setpoint Preservation: Because sensitivity and linear range are held to OEM tolerances, existing vibration alarm and danger setpoints configured in the 3300 XL monitor remain valid after probe replacement — no setpoint re-engineering is required.
• Deterministic Signal Latency: The eddy-current measurement chain introduces no mechanical hysteresis or contact bounce. Signal latency from shaft displacement to monitor input is governed solely by the Proximitor® demodulator filter bandwidth, typically set to 10 kHz, enabling detection of sub-synchronous vibration components down to 600 CPM.
• Diagnostic Transparency via DC Gap Monitoring: The DC component of the output voltage provides a continuous, real-time indication of average shaft centerline position. Trending this value over time reveals bearing wear, thermal growth, and alignment shift — diagnostic data that contact-type sensors cannot provide.
• High-Frequency Vibration Resolution: The 10 kHz flat frequency response supports accurate measurement of blade-pass frequencies in multi-stage compressors and gear mesh frequencies in gearbox monitoring applications, where relevant vibration components can exceed 5 kHz.
• Redundant Installation Support: The 8 mm probe tip diameter and standard mounting thread allow dual-probe redundant installations in API 670-compliant bearing housings, supporting 1oo2 (one-out-of-two) voting logic in safety-instrumented protection systems.
• Reduced Lifecycle Cost: Non-contact sensing eliminates mechanical wear between the sensing element and the rotating shaft. In continuous-duty applications, this translates to multi-year service intervals compared to contact-type displacement sensors that require periodic replacement due to tip erosion.

Quality Assurance & Global Logistics

Every unit of the 32000-28-05-15-080-03-02 supplied through siemensplc.com is sourced from verified industrial automation supply channels with full traceability to Bently Nevada’s manufacturing documentation. Original manufacturer markings, date codes, and calibration labels are preserved intact and documented prior to dispatch. Each assembly undergoes pre-shipment inspection covering housing integrity, connector condition, cable continuity, and coil resistance verification against the published specification range.

Packaging follows anti-static and moisture-barrier protocols: the probe assembly is individually sealed in an ESD-protective bag, cushioned within a rigid foam insert, and enclosed in a labeled outer carton with part number, serial number, and inspection record. This packaging standard is maintained regardless of order quantity.

Logistics operations are based in Xiamen, China, with access to DHL Express, FedEx International Priority, and UCP freight forwarding services. Standard export documentation — commercial invoice, packing list, and certificate of origin — is prepared for every shipment. For urgent plant shutdown scenarios, same-day dispatch is available for in-stock units confirmed before 14:00 CST. Typical transit times: 3–5 business days to Southeast Asia, 5–7 days to Europe and the Middle East, 5–8 days to North America.

A 12-month warranty covers all units from the dispatch date, addressing manufacturing defects and out-of-specification electrical performance. Warranty claims are processed with replacement dispatch within 5 business days of defect confirmation. Technical support for installation verification, signal commissioning, and compatibility queries is available directly via email and WhatsApp.

Contact Information

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