Bently Nevada 30000-28-40-36-02 Eddy Current Proximity Probe Product Specification
30000-28-40-36-02 is a factory pre-calibrated eddy-current proximity probe belonging to Bently Nevada’s standard 30000 transducer series, manufactured conforming to API670 industrial specification for rotating machinery protection and condition monitoring systems. When matched with factory-certified extension cable and compatible proximitor module, it forms a complete closed-loop non-contact displacement measurement system. The probe converts tiny clearance fluctuations between its metal detecting tip and metallic rotating shaft into proportional linear DC voltage signals to realize continuous online measurement of radial shaft vibration, axial thrust displacement and Keyphasor rotational speed parameters. This transducer is widely configured on critical rotating equipment including steam turbines, centrifugal compressors, large turbo-generator sets, boiler feed pumps and industrial blowers within thermal power generation, petrochemical refining and metallurgical smelting industries. Each finished unit undergoes strict factory capacitance matching calibration, full continuity testing, high-low temperature alternating aging cycling and connector sealing durability inspection before ex-factory delivery to guarantee stable linearity and consistent measuring precision amid complicated industrial surroundings with varying ambient temperature, dense lubricant mist and complex electromagnetic interference. All acquired analog measurement signals are transmitted to Bently 3500 monitoring rack systems, field DCS or PLC control cabinets to activate pre-alarm notification and emergency trip interlock logic, effectively avoiding destructive mechanical breakdown of core production equipment caused by excessive rotor displacement or abnormal vibration amplitude.
Description
Bently Nevada 30000-28-40-36-02 Eddy Current Proximity Probe Product Specification
1. Product Overview
30000-28-40-36-02 is a factory pre-calibrated eddy-current proximity probe belonging to Bently Nevada’s standard 30000 transducer series, manufactured conforming to API670 industrial specification for rotating machinery protection and condition monitoring systems. When matched with factory-certified extension cable and compatible proximitor module, it forms a complete closed-loop non-contact displacement measurement system. The probe converts tiny clearance fluctuations between its metal detecting tip and metallic rotating shaft into proportional linear DC voltage signals to realize continuous online measurement of radial shaft vibration, axial thrust displacement and Keyphasor rotational speed parameters. This transducer is widely configured on critical rotating equipment including steam turbines, centrifugal compressors, large turbo-generator sets, boiler feed pumps and industrial blowers within thermal power generation, petrochemical refining and metallurgical smelting industries. Each finished unit undergoes strict factory capacitance matching calibration, full continuity testing, high-low temperature alternating aging cycling and connector sealing durability inspection before ex-factory delivery to guarantee stable linearity and consistent measuring precision amid complicated industrial surroundings with varying ambient temperature, dense lubricant mist and complex electromagnetic interference. All acquired analog measurement signals are transmitted to Bently 3500 monitoring rack systems, field DCS or PLC control cabinets to activate pre-alarm notification and emergency trip interlock logic, effectively avoiding destructive mechanical breakdown of core production equipment caused by excessive rotor displacement or abnormal vibration amplitude.
2. Part Number Coding Definition
The five-section part number follows Bently’s fixed modular coding standard with exclusive parameter definition for every digit segment:30000 stands for core series specification of proximity probe with standard 11mm probe body outer diameter and M14×2 metric mounting thread, factory fixed nominal sensitivity of 3.94V/mm, fully compatible with Bently 3300 and 3500 series proximitor signal conditioning modules.28 defines exposed unthreaded sensing tip length of 28mm, meaning the detection head extends 28 millimeters outward from the starting plane of mounting thread, specially designed for bearing housings with deep oil chambers or limited inner installation space that require long protruding probe tip to approach the measured shaft surface smoothly.40 refers to total stainless steel probe housing length of 400 millimeters, customized for extra-deep mounting holes on thick cast bearing pedestals of heavy-duty large-size rotating machines.36 indicates factory pre-molded integrated probe cable length of 3.6 meters; this fixed cable dimension is pre-calculated into overall loop capacitance matching together with matched extension cable and corresponding proximitor unit, any random field cutting or replacement with non-calibrated alternative cable will break original impedance balance and trigger measurement zero drift plus non-linear output error.02 represents standard cable and terminal configuration: non-armored fluoropolymer outer cable jacket paired with gold-plated standard ClickLoc stainless steel threaded coaxial connector at cable terminal end, without additional metal armor sheath or custom modified plug structure. All mechanical and electrical parameters are locked after factory production and cannot be modified arbitrarily during on-site installation or maintenance.
3. Mechanical and Raw Material Specifications
The internal sensing coil core is fabricated from high-precision temperature-stable alloy material and wrapped with high-temperature resistant modified PPS insulating layer, featuring steady dielectric constant, outstanding oil-proof and anti-corrosion performance to maintain fixed capacitance value under fluctuating ambient temperature and long-term immersion in workshop lubricant mist. Probe outer housing is precision CNC machined solid stainless steel with excellent anti-collision, rust-resistant and high-temperature steam resistant property to support long-term installation near high-temperature running equipment casings. Inner signal transmission conductors adopt multi-strand oxygen-free copper wire to minimize high-frequency signal attenuation and improve anti-RFI electromagnetic interference capability during signal transmission process. Intermediate insulation layer applies fluoropolymer raw material with stable dielectric property that strictly meets eddy-current induction working principle requirements. Outer protective jacket of integrated cable is made of wear-resistant thermoplastic elastomer to defend against on-site mechanical scratch, dust accumulation and long-time lubricant impregnation erosion. The tail-end stainless steel ClickLoc connector is fitted with built-in elastic rubber sealing ring to block moisture, fine metal scrap and hydraulic oil from penetrating into internal wiring junction after locking with matched extension cable connector. The integral cable retains proper flexible bending property to facilitate neat wiring along equipment outer surface and cable trenches without insulation cracking under specified minimum bending radius limit.
4. Electrical Performance and Environmental Working Parameters
This proximity probe must be used together with designated matching proximitor powered by negative DC supply ranging from -17.5VDC to -26VDC. The full measuring loop composed of probe, certified extension cable and supporting proximitor keeps factory pre-calibrated fixed sensitivity of 3.94V/mm, with effective frequency response range covering 0Hz up to 10kHz to satisfy both slow static axial thrust displacement tracking and high-frequency dynamic radial vibration sampling of high-speed rotating rotors.
Permitted continuous operating ambient temperature scope is from -40℃ to +120℃, adapting low-temperature outdoor field installation and high-temperature layout nearby turbine and compressor hot bearing housings; recommended dry storage temperature is controlled between -55℃ ~ +95℃ under fully non-condensing storage environment. Applicable working relative humidity is limited within 5%RH ~ 95RH with no internal condensation allowed inside probe body and cable structure to prevent insulation aging degradation and inner core short-circuit fault. When installed at altitude above 1000 meters above sea level, properly shorten regular inspection cycle to compensate heat dissipation reduction caused by thin atmospheric 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 uninterrupted hot steam immersion is strictly prohibited to extend service life of all internal core components.
5. Application Scope and Routine Maintenance Guidance
30000-28-40-36-02 long-tip protruding proximity probes are extensively mounted on bearing pedestals of large-scale critical rotating equipment as core sensing elements of TSI machine protection systems in thermal power plants, petrochemical refineries and heavy metallurgy production bases, collecting real-time shaft gap and vibration operational data to realize abnormal equipment condition pre-alarm and unit emergency shutdown interlock protection, efficiently preventing severe mechanical faults induced by excessive rotor offset or abnormal vibration magnitude.
During periodic on-site maintenance work, field operators need regular visual inspection of probe housing integrity, outer cable jacket abrasion status and connector locking tightness to avoid intermittent signal loss triggered by loose connection or jacket rupture leading to oil infiltration into inner wiring. For fault spare replacement, only alternative spare probe with identical complete full part number specification is allowed for direct swapping; any modification of protruding tip dimension, housing length or built-in cable length will alter total loop capacitance and result in distorted monitoring data and invalid measured values. All replacement spare probes complete full electrical parameter recalibration and alternating high-low temperature cycling aging test complying with original factory standards before outgoing delivery to guarantee full interchangeability during equipment overhaul and component replacement.
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