June 05, 2026

Bently Nevada 30000-00-73-18-02 Eddy Current Proximity Probe Product Specification

30000-00-73-18-02 is a factory pre-matched and pre-calibrated flush-type eddy-current proximity probe belonging to Bently Nevada 30000 standard series, fully compliant with API670 international specification for rotating machinery protection and TSI online monitoring system. Combined with factory-certified matched extension cable and compatible proximitor transducer, this probe forms a complete closed-loop non-contact displacement measurement system, converting clearance variation between probe sensing face and metallic rotor surface into linear DC voltage output signal. It is mainly applied to continuous real-time measurement of radial shaft vibration, axial thrust displacement and Keyphasor rotational speed parameters on critical high-speed rotating equipment including steam turbines, centrifugal compressors, turbo-generator units, feedwater pumps and industrial blowers in thermal power, petrochemical refining and metallurgical industries. Each finished probe undergoes strict factory quality verification covering full-loop capacitance matching test, wiring continuity inspection, high-low temperature cyclic aging test and connector sealing durability test, guaranteeing stable linear output and outstanding anti-interference performance under severe working conditions with drastic ambient temperature fluctuation, lubricating oil mist erosion and complex electromagnetic field interference. All measured analog signals can be transmitted to 3500 monitoring rack, on-site DCS or PLC control cabinet to trigger pre-alarm and emergency trip interlock for unit safety protection, effectively avoiding severe mechanical breakdown caused by abnormal rotor offset and excessive vibration amplitude.

Description

Bently Nevada 30000-00-73-18-02 Eddy Current Proximity Probe Product Specification

1. Product Overview

2. Part Number Segment Definition

The five-section part number follows fixed modular coding rule of Bently 30000 series, every digit set corresponds to defined mechanical and electrical specifications:

30000 stands for core product series designation, adopting 11mm outer probe body diameter with standard M14×2 metric mounting thread, fixed nominal sensitivity of 3.94V/mm, perfectly compatible with Bently 3300 and 3500 series proximitor modules, standard effective linear measuring range from 0mm to 4mm.

The first 00 defines flush installation configuration with zero exposed protruding sensing tip; the detecting end face is entirely level with thread terminal surface without extended probe rod, designed exclusively for bearing pedestal installation where probe tip penetration into internal oil cavity is prohibited.

73 represents total stainless steel probe housing length of 730 millimeters, customized for deep bore installation holes on heavy-duty bearing supports requiring ultra-long insertion space.

18 specifies fixed integrated built-in probe cable length of 1.8 meters; this cable dimension is pre-calculated into full closed-loop capacitance matching at factory, random on-site cable cutting or replacement with non-matching spare cable will break original impedance balance and result in measuring zero drift and non-linear output deviation.

02 denotes standard cable terminal configuration equipped with industry-standard MIL-C-5015 coaxial connector without cable outer armor sheath, fluoropolymer cable outer jacket with standard sealing structure, no customized plug or special modified wiring layout.

3. Mechanical & Raw Material Specifications

Internal induction winding core is made of high-stability precision alloy wrapped with modified high-temperature resistant PPS insulation layer, maintaining stable dielectric constant and excellent oil-proof corrosion performance to fix internal capacitance steadily under long-term lubricant immersion and variable ambient temperature on industrial site. Probe outer casing is precision CNC processed solid stainless steel with superior rust-proof, anti-collision and high-temperature steam resistant capacity to sustain long-term mounting adjacent to high-temperature equipment shell. Internal signal transmission conductors adopt multi-strand oxygen-free copper wire to minimize high-frequency signal attenuation and improve RFI/EMI anti-interference capability during signal transmission. Intermediate insulating layer uses uniform dielectric fluoropolymer matching eddy-current induction working requirements, outer cable protective sheath is wear-resistant thermoplastic elastomer resisting mechanical scratch, dust accumulation and hydraulic liquid soaking erosion. Tail-end coaxial connector is fitted with built-in elastic rubber sealing ring to block moisture, metal debris and lubricating oil from infiltrating inner wiring after locking connection with matched extension cable, and integrated cable retains regulated bending flexibility to facilitate neat field wiring within specified minimum bending radius without insulation cracking damage.

4. Electrical Performance & Environmental Working Parameters

This proximity probe must operate with designated matched proximitor powered by negative DC supply ranging from -17.5VDC to -26VDC, the full transducer loop keeps factory fixed calibrated sensitivity of 3.94V/mm, effective frequency response ranging from DC 0Hz up to 10kHz to satisfy both slow static axial displacement tracking and high-frequency dynamic radial vibration sampling of high-speed rotors.

Continuous operational ambient temperature ranges from -40℃ to +120℃, adapting low-temperature outdoor layout and high-temperature installation nearby hot bearing housings of turbines and compressors; spare storage temperature is limited between -55℃ and +95℃ under non-condensing dry storage environment. Applicable working relative humidity is controlled within 5%RH~95%RH with no internal condensation allowed inside probe and cable to prevent insulation degradation and internal core short-circuit fault. When installed above 1000 meters altitude, regular inspection cycle shall be shortened properly to compensate heat dissipation reduction from thin air density. The probe can withstand conventional industrial ambient vibration of 10Hz~60Hz; long-term continuous service in surroundings filled with strong corrosive chemical gas and continuous hot steam immersion is forbidden to extend core component service life.

5. Application Scope & Routine Maintenance Instructions

30000-00-73-18-02 long-shell flush proximity probes serve as core sensing components of TSI machinery protection system widely mounted on deep-installation bearing supports of large critical rotating units across power, petrochemical and heavy metallurgy industries, collecting real-time shaft clearance and vibration operational data to realize abnormal working condition early warning and unit emergency shutdown interlock protection, preventing serious mechanical faults induced by excessive rotor displacement and out-of-limit vibration.

During periodic field maintenance, maintenance staff needs regular visual inspection on probe casing integrity, outer cable jacket abrasion condition and connector locking tightness to avoid intermittent signal loss caused by loose connection or jacket rupture leading to oil infiltration into internal wiring. For fault spare replacement, only alternative probe with identical full part number specification is allowed for direct swapping; any modification of flush tip structure, housing dimension or built-in cable length will alter full-loop capacitance and cause distorted monitoring data and invalid measured values. All replacement spare probes complete full electrical parameter recalibration and alternating high-low temperature cycling aging test in line with original factory standards before delivery to guarantee complete interchangeability during equipment overhaul and component replacement.

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