Bently Nevada 30000-18-32-36-02 Eddy Current Proximity Probe Product Specification

30000-18-32-36-02 is factory pre-calibrated eddy-current proximity probe from Bently Nevada 30000 series, designed per API670 standard for TSI rotating machinery supervision and protection system. When matched with certified extension cable and corresponding proximitor transducer, the product forms a complete non-contact clearance measuring circuit. It converts tiny gap fluctuation between probe tip and metallic rotating shaft into stable linear DC voltage signal, realizing continuous online measurement of rotor radial vibration, axial thrust displacement and Keyphasor rotational speed for critical rotating machinery including steam turbines, centrifugal compressors, feedwater pumps, blowers and generator sets in thermal power, petrochemical and metallurgical industries. Each finished probe undergoes factory capacitance matching test, continuity inspection, high-low temperature cycling aging and connector sealing test before delivery to ensure stable linearity and measuring precision under complicated industrial surroundings with changing temperature, heavy oil mist and complex electromagnetic interference. Measured signals are transmitted to Bently 3500 monitoring rack, on-site DCS or PLC control system to trigger pre-alarm and emergency trip interlock for preventing catastrophic mechanical damage of production units.

The five-section part number complies with Bently standardized modular coding rules with fixed parameter definition per segment:30000 stands for core product series of proximity probe with 11mm probe body diameter and standard M14×2 mounting thread, with fixed factory sensitivity at 3.94V/mm and compatible with 3500 / 3300 series proximitors.18 defines exposed unthreaded sensing tip length of 18mm, referring to bare detecting section from probe head to the start of mounting thread, designed for medium-deep mounting holes on conventional bearing housings which need moderate extension of sensing tip close to rotor surface.32 represents total probe metal housing length of 320mm, customized for equipment with relatively deep installation cavities on bearing pedestals.36 specifies pre-integrated factory-calibrated built-in probe cable length of 3.6 meters; this fixed length is counted into total loop capacitance together with extension cable and proximitor, arbitrary field cutting or mismatched cable replacement will destroy preset impedance matching and lead to measuring zero drift and nonlinear error.02 indicates standard configuration: non-armored fluoropolymer outer cable jacket equipped with gold-plated standard ClickLoc stainless steel threaded connector at cable end, no outer metal armor or special customized plug structure equipped. All specification parameters are locked during production and cannot be modified randomly after leaving factory.

The probe internal sensing coil core is made of high-stability precision alloy and wrapped with high-temperature resistant PPS insulating layer, featuring stable dielectric constant, outstanding oil resistance and anti-corrosion performance to maintain fixed capacitance under fluctuating ambient temperature and lubricant mist environment. Probe outer housing adopts precision machined solid stainless steel with superior anti-collision, anti-rust and anti-high-temperature steam performance for long-term installation near hot-running equipment casing. Internal signal conductors are multi-strand oxygen-free copper to reduce high-frequency signal attenuation and improve anti-electromagnetic interference capability. Intermediate insulation layer uses fluoropolymer material with steady dielectric property matching eddy-current working requirements. Outer cable jacket is wear-resistant thermoplastic elastomer to resist field scratch, dust accumulation and oil soaking erosion. The tail stainless steel connector is fitted with built-in elastic rubber sealing ring to block moisture, fine metal debris and hydraulic oil from penetrating into internal wiring after mating with extension cable terminal. The integrated cable keeps proper flexible property for convenient on-site wiring within regulated minimum bending radius without insulation cracking.

This proximity probe must be paired with matched proximitor powered by negative DC supply ranging from -17.5VDC to -26VDC. The complete measuring loop consisting of probe, certified extension cable and supporting proximitor retains factory preset calibrated sensitivity of 3.94V/mm, with effective frequency response ranging from 0Hz to 10kHz to cover both slow static axial displacement tracking and high-frequency dynamic radial vibration collection 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 near hot turbine and compressor bearing housings; dry storage temperature spans -55℃ to +95℃ under non-condensing storage environment. Applicable working relative humidity is limited between 5%RH and 95%RH with no internal condensation allowed to avoid insulation aging and inner core short-circuit failure. When installed above 1000 meters altitude, shorten regular inspection cycle properly due to thinner air and reduced heat dissipation efficiency. The probe can withstand regular industrial ambient vibration of 10Hz~60Hz; long-term continuous service in surroundings with strong corrosive chemical gas and persistent hot steam immersion is strictly forbidden to extend service life of internal components.

30000-18-32-36-02 proximity probes are widely installed on bearing pedestals of large rotating equipment as core sensing components of TSI machinery protection system in power plants, oil refineries and metallurgical workshops, collecting real-time shaft clearance and vibration data to realize abnormal working condition alarm and unit emergency shutdown interlock protection.

During regular field maintenance, inspect probe housing integrity, outer cable abrasion status and connector fastening tightness periodically to avoid intermittent signal loss caused by loose connection or jacket rupture and subsequent oil infiltration inside wiring. For fault replacement, only spare probe with identical full part number can be adopted; mismatched tip dimension, housing length or built-in cable length will change total loop capacitance and cause measuring data distortion. All aftermarket refurbished probes complete full capacitance recalibration, load aging and alternating high-low temperature shock test complying with original factory standards before delivery to guarantee full interchangeability during equipment overhaul and spare part replacement.