Bently Nevada 300-00-00-75-18-01 Eddy Current Proximity Probe Product Specification
300-00-00-75-18-01 is a factory pre-calibrated flush-type eddy-current proximity probe from Bently Nevada 300 series, manufactured in accordance with API670 industry specification for TSI rotating machinery supervision and safety protection systems. When assembled with factory-certified matching extension cable and compatible proximitor transducer, the probe forms a complete closed-loop non-contact displacement measurement circuit. It converts subtle clearance variations between flush sensing face and metallic rotating shaft into proportional linear DC voltage signals to realize continuous online monitoring of radial shaft vibration, axial thrust displacement and Keyphasor rotational speed parameters. This sensing unit is widely installed on critical high-speed rotating equipment including steam turbines, centrifugal compressors, turbo-generator sets, boiler feedwater pumps and industrial blowers within thermal power generation, petrochemical refining and heavy metallurgy industries. Every finished probe passes strict factory inspection procedures including full-loop capacitance matching test, complete wiring continuity detection, alternating high-low temperature cycling aging treatment and connector sealing durability verification before outbound delivery, which guarantees consistent linearity and precise measuring performance under complicated harsh industrial conditions featuring drastic ambient temperature variation, dense lubricating oil mist accumulation and complicated electromagnetic field interference. All collected analog measuring signals are transmitted to Bently 3500 monitoring rack, field DCS or PLC control system to activate pre-warning alarm and unit emergency trip interlock logic, effectively preventing severe mechanical breakdown caused by excessive rotor offset and abnormal vibration amplitude of core rotating components.
Description
Bently Nevada 300-00-00-75-18-01 Eddy Current Proximity Probe Product Specification
1. Product Overview
300-00-00-75-18-01 is a factory pre-calibrated flush-type eddy-current proximity probe from Bently Nevada 300 series, manufactured in accordance with API670 industry specification for TSI rotating machinery supervision and safety protection systems. When assembled with factory-certified matching extension cable and compatible proximitor transducer, the probe forms a complete closed-loop non-contact displacement measurement circuit. It converts subtle clearance variations between flush sensing face and metallic rotating shaft into proportional linear DC voltage signals to realize continuous online monitoring of radial shaft vibration, axial thrust displacement and Keyphasor rotational speed parameters. This sensing unit is widely installed on critical high-speed rotating equipment including steam turbines, centrifugal compressors, turbo-generator sets, boiler feedwater pumps and industrial blowers within thermal power generation, petrochemical refining and heavy metallurgy industries. Every finished probe passes strict factory inspection procedures including full-loop capacitance matching test, complete wiring continuity detection, alternating high-low temperature cycling aging treatment and connector sealing durability verification before outbound delivery, which guarantees consistent linearity and precise measuring performance under complicated harsh industrial conditions featuring drastic ambient temperature variation, dense lubricating oil mist accumulation and complicated electromagnetic field interference. All collected analog measuring signals are transmitted to Bently 3500 monitoring rack, field DCS or PLC control system to activate pre-warning alarm and unit emergency trip interlock logic, effectively preventing severe mechanical breakdown caused by excessive rotor offset and abnormal vibration amplitude of core rotating components.
2. Part Number Coding Definition
The six-segment part number follows standardized modular coding specification of Bently 300 series, each segment corresponds to fixed mechanical and electrical parameter definition:300 stands for core product series designation, adopting 11mm outer probe body diameter and standard M14×2 metric mounting thread, factory fixed nominal sensitivity of 3.94V/mm and fully compatible with Bently 3300 and 3500 series proximitor modules.The first two successive 00 codes represent flush installation design: zero exposed unthreaded sensing tip, the probe detecting end face is completely flush with thread terminal surface without any protruding bare sensing rod, specially applicable for bearing housings where extended probe tip penetrating into internal oil chamber is prohibited.75 defines total stainless steel probe housing length of 750 millimeters, customized for ultra-deep bore mounting holes on large-size heavy-duty bearing pedestals with extra deep installation space requirements.18 specifies factory pre-molded integrated built-in probe cable length of 1.8 meters; this fixed cable dimension is calculated into total closed-loop capacitance matching together with matched extension cable and supporting proximitor, arbitrary on-site cable cutting or replacement with non-matching spare cable will break preset impedance balance and induce measuring zero drift and non-linear output deviation.01 stands for standard cable and terminal configuration: non-armored fluoropolymer outer cable jacket fitted with standard stainless steel threaded coaxial connector at cable tail end without gold plating treatment, without additional metal armor sheath or custom modified plug structure; all inherent mechanical and electrical parameters are solidified after factory production and cannot be randomly altered during field installation and commissioning.
3. Mechanical and Raw Material Specifications
The internal sensing winding core is manufactured from high-stability precision alloy material and wrapped with high-temperature resistant modified PPS insulating layer, maintaining steady dielectric constant and outstanding anti-oil corrosion property to fix internal capacitance value steadily under variable ambient temperature and long-term continuous lubricant mist immersion on production site. Probe outer casing is precision CNC processed solid stainless steel with excellent anti-collision, rust-proof and high-temperature steam resistant capability to sustain long-term mounting adjacent to high-temperature running equipment shell. Internal signal transmission conductors use multi-strand oxygen-free copper wire to minimize high-frequency signal attenuation and improve anti-RFI electromagnetic interference capacity during signal delivery. Intermediate insulation layer is made of fluoropolymer with uniform dielectric property perfectly matching eddy-current induction operating requirements. Outer protective sheath of integrated cable is wear-resistant thermoplastic elastomer to resist on-site mechanical scratch, dust deposition and lubricant liquid soaking erosion. The tail-end stainless steel connector is equipped with built-in elastic rubber sealing ring to block moisture, fine metal scraps and hydraulic oil from infiltrating into internal wiring after locking connection with matched extension cable connector. The integrated cable keeps proper flexible bending characteristic for neat field wiring within defined minimum bending radius without insulation layer cracking damage.
4. Electrical Performance and Environmental Working Parameters
This proximity probe must cooperate 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 retains factory pre-calibrated fixed sensitivity of 3.94V/mm, with effective frequency response ranging from 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 ranges from -40℃ to +120℃ to adapt low-temperature outdoor installation and high-temperature layout nearby hot turbine and compressor bearing housings; dry spare storage temperature is controlled between -55℃ ~ +95℃ under fully non-condensing storage environment. Applicable working relative humidity is limited within 5%RH ~ 95%RH with no internal condensation allowed inside probe and cable to prevent insulation degradation and inner core short-circuit fault. When installed above 1000 meters altitude, shorten regular inspection cycle appropriately 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
300-00-00-75-18-01 extra-long flush-type proximity probes are widely mounted on deep-installation bearing supports of large-scale critical rotating equipment as core sensing parts of TSI machinery 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 working condition pre-alarm and unit emergency shutdown interlock protection, efficiently preventing severe mechanical faults induced by excessive rotor displacement 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 change of flush tip structure, housing dimension 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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