Bently Nevada 30000-00-48-36-02 Eddy Current Proximity Probe Product Specification
30000-00-48-36-02 is a factory pre-calibrated flush-type eddy-current proximity probe from Bently Nevada 30000 series, manufactured strictly per API670 standard for TSI rotating machinery monitoring and safety protection systems. Paired with factory-certified matched extension cable and compatible proximitor transducer, the probe forms a complete closed-loop non-contact displacement measuring circuit. Following the eddy-current induction principle, it converts subtle clearance variation between flush sensing face and metallic rotor surface into stable linear DC voltage signals to continuously measure radial shaft vibration, axial thrust displacement and Keyphasor rotational speed online. This sensor is widely used on critical high-speed rotating equipment including steam turbines, centrifugal compressors, turbo-generator sets, boiler feedwater pumps and industrial blowers in thermal power, petrochemical refining and metallurgical industries. Every finished probe undergoes full-loop capacitance matching test, wiring continuity inspection, high-low temperature cyclic aging test and connector sealing durability test before shipment, ensuring stable linear output and reliable measuring accuracy under harsh working conditions with fluctuating ambient temperature, dense lubricating oil mist and complex electromagnetic interference. All analog measured signals are transmitted to Bently 3500 monitoring rack, field DCS or PLC control system to trigger pre-alarm and emergency trip interlock, avoiding serious mechanical damage caused by excessive rotor offset and over-limit vibration amplitude.
Description
Bently Nevada 30000-00-48-36-02 Eddy Current Proximity Probe Product Specification
1. Product Overview
30000-00-48-36-02 is a factory pre-calibrated flush-type eddy-current proximity probe from Bently Nevada 30000 series, manufactured strictly per API670 standard for TSI rotating machinery monitoring and safety protection systems. Paired with factory-certified matched extension cable and compatible proximitor transducer, the probe forms a complete closed-loop non-contact displacement measuring circuit. Following the eddy-current induction principle, it converts subtle clearance variation between flush sensing face and metallic rotor surface into stable linear DC voltage signals to continuously measure radial shaft vibration, axial thrust displacement and Keyphasor rotational speed online. This sensor is widely used on critical high-speed rotating equipment including steam turbines, centrifugal compressors, turbo-generator sets, boiler feedwater pumps and industrial blowers in thermal power, petrochemical refining and metallurgical industries. Every finished probe undergoes full-loop capacitance matching test, wiring continuity inspection, high-low temperature cyclic aging test and connector sealing durability test before shipment, ensuring stable linear output and reliable measuring accuracy under harsh working conditions with fluctuating ambient temperature, dense lubricating oil mist and complex electromagnetic interference. All analog measured signals are transmitted to Bently 3500 monitoring rack, field DCS or PLC control system to trigger pre-alarm and emergency trip interlock, avoiding serious mechanical damage caused by excessive rotor offset and over-limit vibration amplitude.
2. Part Number Coding Definition
The five-digit-segment part number follows Bently’s standardized modular coding rules with fixed parameter definition for each section:30000 represents core product series, featuring 11mm outer probe diameter and standard M14×2 metric mounting thread, fixed factory sensitivity of 3.94V/mm and full compatibility with Bently 3300 and 3500 series proximitor modules.00 stands for zero exposed unthreaded sensing tip; the probe detecting end is fully flush with thread end face without protruding sensing rod, designed for flush installation on bearing housings where tip penetration into internal oil chamber is prohibited.48 defines total stainless steel probe housing length of 480mm, customized for medium-depth mounting holes on regular bearing pedestals.36 specifies pre-attached integral probe cable length of 3.6 meters; this fixed length is included into factory full-loop capacitance matching calculation together with matched extension cable and proximitor. Random on-site cable cutting or replacement with unmatched cable will break preset impedance balance and result in measuring zero drift and non-linear output error.02 denotes standard cable structure: non-armored fluoropolymer outer jacket equipped with gold-plated standard stainless steel threaded ClickLoc coaxial connector at cable tail, without external metal armor sheath or custom modified plug structure. All mechanical and electrical parameters are fixed after production and cannot be arbitrarily modified on installation site.
3. Mechanical and Raw Material Specifications
Internal induction winding core is made of high-stability precision alloy wrapped with high-temperature resistant modified PPS insulation layer, keeping stable dielectric constant and excellent oil-proof anti-corrosion performance to maintain fixed internal capacitance under variable ambient temperature and long-term on-site oil mist soaking. Probe outer housing adopts precision CNC solid stainless steel with outstanding anti-impact, rust-proof and high-temperature steam resistant performance for long-term installation near high-temperature equipment shell. Internal multi-strand oxygen-free copper conductors reduce high-frequency signal attenuation and improve anti-RFI interference capability. Intermediate fluoropolymer insulation maintains uniform dielectric property matching eddy-current working requirements. Outer cable sheath is wear-resistant thermoplastic elastomer resisting scratch, dust accumulation and lubricant erosion. The tail stainless steel connector has built-in elastic rubber sealing ring to prevent moisture, fine metal scraps and hydraulic oil from penetrating inner wiring after locking with matched extension cable terminal. The integrated cable retains proper flexibility for neat field wiring within specified minimum bending radius without insulation cracking.
4. Electrical Performance and Environmental Working Parameters
This probe must be used with matched proximitor powered by negative DC supply ranging from -17.5VDC to -26VDC. The complete measuring loop of probe, certified extension cable and proximitor keeps factory-calibrated sensitivity of 3.94V/mm, with effective frequency response ranging from 0Hz to 10kHz to satisfy both slow static axial displacement tracking and high-frequency dynamic radial vibration sampling of high-speed rotors.
Permitted continuous operating temperature ranges from -40℃ to +120℃ for low-temperature outdoor installation and high-temperature layout near hot bearing housings of turbines and compressors; dry storage temperature is controlled between -55℃ ~ +95℃ under non-condensing environment. Working relative humidity is limited from 5%RH to 95%RH with no internal condensation allowed inside probe and cable to avoid insulation degradation and inner core short-circuit. When installed above 1000 meters altitude, shorten regular inspection cycle properly for compensation of declined heat dissipation caused by thin air density. The probe withstands conventional industrial vibration of 10Hz~60Hz; long-term continuous operation in environment with strong corrosive gas and continuous hot steam is strictly forbidden to extend service life of internal components.
5. Application Scope and Routine Maintenance Guidance
30000-00-48-36-02 medium-short flush-mounted proximity probes are core sensing components of TSI machinery protection system, widely mounted on medium-depth bearing supports of large critical rotating units in power plants, petrochemical refineries and metallurgical workshops to collect real-time shaft clearance and vibration data for abnormal condition early warning and emergency shutdown interlock protection, preventing severe mechanical faults induced by excessive rotor displacement or over-range vibration.
During periodic maintenance, operators regularly check probe housing integrity, outer cable abrasion and connector fastening tightness to avoid intermittent signal loss from loose connection or jacket rupture and subsequent oil infiltration. For faulty replacement, only spare probe with identical full part number can be directly swapped; any alteration on flush tip structure, housing length or built-in cable length will change full-loop capacitance and lead to distorted measuring data. All replacement probes complete full capacitance recalibration and alternating high-low temperature cycling aging test complying with original factory standards before delivery to ensure full interchangeability during equipment overhaul.
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