Bently Nevada 30000-00-51-18-02 Eddy Current Proximity Probe Product Specification
30000-00-51-18-02 is a factory pre-calibrated flush-type eddy-current proximity probe of Bently Nevada 30000 series, designed and produced in accordance with API670 international specification for TSI rotating machinery monitoring and safety protection systems. When matched with factory-certified extension cable and compatible proximitor transducer, this probe forms a complete closed-loop non-contact displacement measurement circuit. By eddy current induction principle, it converts tiny clearance changes between flush sensing end face and metallic rotating shaft into linear DC voltage output signals for continuous online monitoring of radial shaft vibration, axial thrust displacement and Keyphasor rotational speed. It is extensively applied on critical high-speed rotating equipment including steam turbines, centrifugal compressors, turbo-generator sets, boiler feedwater pumps and industrial blowers across thermal power, petrochemical refining and metallurgical industries. Every finished probe passes full-loop capacitance matching test, wiring continuity inspection, high-low temperature cyclic aging test and connector sealing durability test before shipment to ensure stable linear output and reliable measuring accuracy under complicated industrial environments with fluctuating ambient temperature, heavy lubricant oil mist and complex electromagnetic interference. All collected analog signals are transmitted to Bently 3500 monitoring rack, field DCS or PLC control system to trigger pre-alarm and emergency trip interlock, avoiding severe mechanical faults resulting from excessive rotor offset or out-of-limit vibration amplitude.
Description
Bently Nevada 30000-00-51-18-02 Eddy Current Proximity Probe Product Specification
1. Product Overview
30000-00-51-18-02 is a factory pre-calibrated flush-type eddy-current proximity probe of Bently Nevada 30000 series, designed and produced in accordance with API670 international specification for TSI rotating machinery monitoring and safety protection systems. When matched with factory-certified extension cable and compatible proximitor transducer, this probe forms a complete closed-loop non-contact displacement measurement circuit. By eddy current induction principle, it converts tiny clearance changes between flush sensing end face and metallic rotating shaft into linear DC voltage output signals for continuous online monitoring of radial shaft vibration, axial thrust displacement and Keyphasor rotational speed. It is extensively applied on critical high-speed rotating equipment including steam turbines, centrifugal compressors, turbo-generator sets, boiler feedwater pumps and industrial blowers across thermal power, petrochemical refining and metallurgical industries. Every finished probe passes full-loop capacitance matching test, wiring continuity inspection, high-low temperature cyclic aging test and connector sealing durability test before shipment to ensure stable linear output and reliable measuring accuracy under complicated industrial environments with fluctuating ambient temperature, heavy lubricant oil mist and complex electromagnetic interference. All collected analog signals are transmitted to Bently 3500 monitoring rack, field DCS or PLC control system to trigger pre-alarm and emergency trip interlock, avoiding severe mechanical faults resulting from excessive rotor offset or out-of-limit vibration amplitude.
2. Part Number Coding Definition
The five-segment part number follows Bently’s fixed modular coding rules with defined specifications for each segment:30000 represents core product series, with 11mm outer probe diameter and standard M14×2 mounting thread, factory-set fixed sensitivity of 3.94V/mm, fully compatible with Bently 3300 and 3500 series proximitor modules.00 indicates zero exposed unthreaded sensing tip; the detecting surface is fully flush with thread end face without protruding probe rod, specially for bearing housings that forbid tip intrusion into internal lubricant cavity.51 stands for total stainless steel probe housing length of 510mm, customized for medium-deep mounting holes on conventional heavy-duty bearing supports.18 specifies pre-attached integral probe cable length of 1.8 meters; this fixed length is pre-calculated into full-loop capacitance matching at factory. Random on-site cutting or mismatched cable replacement will break impedance balance and cause measurement zero drift and non-linear errors.02 refers to standard cable configuration: non-armored fluoropolymer outer jacket fitted with gold-plated stainless steel threaded ClickLoc connector at cable end, no external metal armor or customized plug modification. All mechanical and electrical parameters are fixed after production and cannot be altered arbitrarily on site.
3. Mechanical and Raw Material Specifications
Internal induction coil core is made of high-stability precision alloy wrapped with high-temperature resistant modified PPS insulation layer, maintaining stable dielectric constant and excellent oil & corrosion resistance to fix internal capacitance steadily under varying temperature and long-term oil mist immersion. Probe outer housing is precision CNC solid stainless steel with superior rust-proof, anti-shock and high-temperature steam resistant performance for long-term installation adjacent to hot equipment casing. Internal multi-strand oxygen-free copper conductors minimize high-frequency signal attenuation and strengthen anti-RFI interference capability. Intermediate fluoropolymer insulation has uniform dielectric property matching eddy-current operating requirements. Outer cable sheath is wear-resistant thermoplastic elastomer against mechanical scratch, dust accumulation and lubricant soaking. Tail stainless steel connector is equipped with built-in elastic rubber sealing ring to block moisture, metal debris and oil from penetrating inner wiring after connecting with matched extension cable. The integral cable keeps proper flexibility for field wiring within specified minimum bending radius without insulation cracking.
4. Electrical Performance and Environmental Working Parameters
The probe must work with matched proximitor powered by DC negative supply ranging from -17.5VDC to -26VDC. The complete measurement loop of probe, certified extension cable and proximitor remains factory-calibrated sensitivity of 3.94V/mm, with effective frequency response from 0Hz to 10kHz to track slow static axial displacement and sample high-frequency dynamic radial vibration of high-speed rotors.
Continuous operating ambient temperature ranges from -40℃ to +120℃, suitable for low-temperature outdoor installation and high-temperature layout near hot turbine and compressor bearing housings; dry storage temperature is controlled between -55℃ and +95℃ under non-condensing conditions. Working relative humidity is limited within 5%RH~95%RH with no internal condensation permitted inside probe and cable to prevent insulation degradation and inner core short circuit. When installed above 1000 meters altitude, shorten regular inspection cycle appropriately due to poor heat dissipation in thin air. The probe withstands standard industrial vibration of 10Hz~60Hz; long-term continuous operation in heavily corrosive gas and continuous hot steam environment is forbidden to extend component service life.
5. Application Scope and Routine Maintenance Guidance
30000-00-51-18-02 medium-length flush proximity probes serve as core sensing components of TSI machinery protection system, widely mounted on medium-deep bearing pedestals of large critical rotating units in power plants, petrochemical refineries and metallurgical workshops for real-time shaft clearance and vibration monitoring.
During regular maintenance, inspect probe housing integrity, outer cable abrasion and connector fastening tightness periodically to avoid intermittent signal loss caused by loose connection or jacket rupture and subsequent oil infiltration. For equipment replacement, only spare probe with identical full part number is allowed for direct swap; any change of flush tip structure, housing dimension or built-in cable length will alter full-loop capacitance and lead to distorted measuring data. All replacement probes complete full capacitance recalibration and alternating high-low temperature aging test per original factory standards before delivery to guarantee full interchangeability during equipment overhaul.
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