Bently Nevada 300-00-00-32-18-02 Eddy Current Proximity Probe Product Specification

300-00-00-32-18-02 is a factory pre-calibrated flush type eddy-current proximity probe from Bently Nevada 300 series, fully manufactured per API670 international standard for turbomachinery supervision and protection instrumentation. Combined with matched extension cable and compatible Proximitor transducer, this probe forms a complete closed-loop non-contact measuring system operating on eddy-current induction principle. It converts real-time clearance variation between probe sensing end and metallic rotating shaft surface into proportional linear DC voltage output to continuously monitor radial rotor vibration, axial thrust displacement and Keyphasor rotational speed parameters. Widely installed on steam turbines, centrifugal compressors, turbo-generators, boiler feed pumps and industrial blowers within thermal power, petrochemical refining and metallurgical industries. Every finished probe passes rigorous factory inspections including full-loop capacitance matching test, wiring continuity check and high-low temperature cyclic aging before delivery, ensuring stable measurement precision under severe working conditions with drastic temperature fluctuation, dense lubricant oil mist and complicated electromagnetic interference. All collected analog signals are transmitted to 3500 monitor rack or on-site DCS/PLC control system to trigger early warning and emergency trip interlock logic for avoiding destructive mechanical faults caused by excessive rotor deflection and over-limit vibration.

The six-section part number follows standardized modular coding rule of 300 series with fixed parameter definition for each segment:300 stands for core 11mm outer diameter probe series equipped with standard M14×2 mounting thread, fixed factory sensitivity of 3.94V/mm, electrically compatible with Bently 3300 and 3500 series Proximitor modules.The first 00 means zero exposed tip configuration; the detecting face is completely flush with thread end without protruding sensing rod, suitable for bearing housings where extended tip penetrating into inner lubrication chamber is forbidden.The second 00 represents standard internal coil and insulation structure without customized high-temperature ceramic tip or special high-pressure sealing modification.32 specifies overall stainless steel probe housing length of 320 millimeters, designed for medium-shallow installation holes of conventional bearing pedestals.18 refers to factory integrated pre-molded probe cable length of 1.8 meters; total loop capacitance is pre-matched with corresponding extension cable and Proximitor at factory, random field cable cutting or replacement with non-certified spare cable will break original impedance balance and lead to measurement zero drift and nonlinear error.02 denotes standard cable and terminal setup: non-armored fluoropolymer outer cable jacket fitted with gold-plated ClickLoc coaxial connector at cable tail, no external metal armor or customized plug modification. All mechanical and electrical parameters are fixed after factory calibration and cannot be modified arbitrarily during field commissioning.

Inner induction winding core is produced with high-stability precision alloy wrapped by high-temperature resistant PPS insulating layer to keep constant dielectric coefficient and outstanding oil-proof, anti-corrosion performance amid long-term oil mist soaking and varying ambient temperature. Outer probe housing is precision CNC machined solid stainless steel with excellent rust resistance, impact tolerance and high-temperature steam endurance for long-term mounting near high-temperature equipment casings. Internal signal conductors adopt multi-strand oxygen-free copper to reduce high-frequency signal attenuation and strengthen anti-RFI interference performance during signal transmission. Intermediate fluoropolymer insulation matches dielectric requirements of eddy-current working principle, and outer cable sheath is wear-resistant elastomer resisting field scratch, dust accumulation and lubricant erosion. Tail ClickLoc stainless steel connector is equipped with built-in elastic rubber sealing ring to block moisture, metal debris and hydraulic oil from invading inner wiring after locking with matched extension cable end. The integral cable retains proper flexibility and must be bent above designated minimum bending radius to prevent outer sheath crack and insulation damage.

This proximity probe must cooperate with designated matched Proximitor powered by negative DC supply ranging from -17.5VDC to -26VDC. The full measuring loop consisting of probe, certified extension cable and supporting Proximitor maintains fixed calibrated sensitivity of 3.94V/mm, with frequency response ranging from DC 0Hz up to 10kHz to cover both slow static axial displacement tracking and high-frequency dynamic radial vibration sampling of high-speed rotors.Continuous allowable operating ambient temperature ranges from -40℃ to +120℃ to satisfy low-temperature outdoor installation and high-temperature layout close to turbine and compressor bearing housings; spare storage temperature is limited between -55℃ and +95℃ under non-condensing storage environment. Applicable working relative humidity is 5%RH~95%RH without internal condensation inside probe and cable to avoid insulation aging and inner core short-circuit. For installation above altitude of 1000 meters, shorten routine inspection cycle properly to compensate heat dissipation decline from thin air. The probe can bear standard industrial ambient vibration of 10Hz~60Hz; continuous long-term service in heavily corrosive gas and uninterrupted hot steam immersion surroundings is prohibited to extend component service life.

300-00-00-32-18-02 flush-mounted short-shell proximity probe serves as core sensing component of TSI machinery protection system for medium-shallow bore bearing supports on critical large rotating equipment across power, petrochemical and metallurgical industries, collecting real-time shaft clearance and vibration data to realize abnormal condition early warning and unit emergency shutdown interlock protection.During regular on-site maintenance, operators need periodic visual inspection of probe housing integrity, outer cable abrasion status and connector locking tightness to eliminate intermittent signal failure induced by loose connection or oil infiltration after sheath rupture. Only replacement probe with identical complete part number is allowed for direct swapping; any alteration on tip structure, housing dimension or built-in cable length will change total closed-loop capacitance and result in invalid monitoring readings. All alternative spare probes complete full parameter recalibration and alternating high-low temperature aging test per original factory standards before delivery to guarantee full interchangeability during equipment overhaul.