Bently Nevada 30000-00-33-18-02 Eddy Current Proximity Probe Product Specification

30000-00-33-18-02 is factory pre-calibrated flush-type 11mm eddy-current proximity probe belonging to Bently Nevada 30000 compact series, fully compliant with API670 industrial standard for turbomachinery supervisory instrumentation and protection system. Matched with certified extension cable and compatible proximitor transducer, the probe constitutes a complete non-contact displacement measurement loop based on eddy-current induction principle. It converts variable clearance between probe sensing face and metallic rotor surface into linear DC voltage output to continuously monitor radial shaft vibration, axial thrust position and Keyphasor rotational speed parameters for critical rotating equipment. Typical application scenarios cover steam turbines, centrifugal compressors, turbo-generators, feed water pumps and industrial blowers deployed in thermal power, petrochemical and metallurgical industries. Every finished unit passes factory strict quality inspections including closed-loop capacitance matching test, wiring continuity check and high-low temperature cyclic aging test to guarantee stable measuring accuracy under harsh industrial surroundings with heavy oil mist, dramatic temperature swing and complex electromagnetic interference. All acquired analog signals are transmitted to 3500 monitor rack or site DCS/PLC system to realize pre-alarm and emergency trip interlock, avoiding catastrophic mechanical damage caused by excessive rotor deflection and abnormal vibration.

The five-segment part number follows standardized modular coding rule of 30000 series, each code stands for fixed mechanical and electrical parameters:30000 represents core product series specification: compact 11mm outer diameter probe with standard M14×1.5 mounting thread, fixed factory sensitivity of 3.94V/mm, electrically compatible with Bently 3300 and 3500 series proximitor modules.The first 00 defines zero exposed unthreaded tip structure; the sensing end face is completely flush with thread terminal without protruding bare probe head, designed for closed bearing housing installation where extended tip penetration into lubrication cavity is forbidden.33 specifies overall stainless steel probe housing length of 330 millimeters, suitable for medium-shallow installation bore on standard bearing pedestals.18 denotes factory integrated pre-molded probe cable length of 1.8 meters; total loop capacitance is pre-matched at factory together with matching extension cable and proximitor. Random field cable cutting or replacement with non-certified spare cable will break impedance balance and result in zero drift and non-linear measurement error, which is strictly prohibited during on-site commissioning.02 refers to standard cable and terminal configuration: non-armored fluoropolymer outer jacket equipped with gold-plated standard ClickLoc coaxial connector at cable tail end, without external metal armor or customized plug modification. All inherent electrical and mechanical parameters are fixed after factory calibration and cannot be altered arbitrarily.

Internal induction coil core is made of high-stability precision alloy wrapped with high-temperature resistant PPS insulating layer, maintaining constant dielectric property and excellent oil-proof anti-corrosion performance against long-term immersion of equipment lubricating oil under fluctuating ambient temperature. Probe outer housing is precision CNC processed solid stainless steel featuring outstanding anti-rust, impact resistance and high-temperature steam tolerance for long-term mounting adjacent to hot equipment casing. Inner signal conductor adopts multi-strand oxygen-free copper wire to reduce high-frequency signal attenuation and improve anti-RFI interference capacity during signal transmission. Intermediate fluoropolymer insulation matches dielectric parameter requirement of eddy-current working principle. Outer cable sheath is wear-resistant thermoplastic elastomer capable of resisting field scratch, dust accumulation and lubricant corrosion. Tail ClickLoc stainless steel connector is fitted with built-in elastic rubber sealing ring to block moisture, metal debris and hydraulic oil from invading internal wiring after locking with matched extension cable terminal. The integral cable maintains appropriate flexibility and shall be bent above specified minimum bending radius to prevent outer jacket cracking and insulation damage.

This proximity probe must work with designated matching proximitor powered by DC input ranging from -17.5VDC to -26VDC. The complete measuring assembly including probe, certified extension cable and proximitor retains factory fixed sensitivity at 3.94V/mm, effective frequency response spans from DC 0Hz up to 10kHz, covering both slow static axial thrust position tracking and high-frequency dynamic radial vibration sampling for high-speed rotating rotors.Continuous operational ambient temperature ranges from -40℃ to +120℃ to satisfy low-temperature outdoor installation and high-temperature layout near turbine and compressor bearing housings; spare storage temperature is controlled between -55℃ and +95℃ under non-condensing environment. Applicable working relative humidity is 5%RH~95%RH without internal condensation inside probe and cable to avoid insulation degradation and core short-circuit fault. When installed at altitude over 1000 meters, shorten routine inspection cycle to offset heat dissipation reduction from thin air. The probe can withstand normal industrial ambient vibration of 10Hz~60Hz; long-term continuous operation in strong corrosive gas and persistent hot steam immersion environment is forbidden to extend component service life.

30000-00-33-18-02 flush-mounted short housing 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 generation, petrochemical and heavy metallurgy sectors, collecting real-time shaft clearance and vibration operational data for abnormal condition early warning and unit shutdown interlock protection.During periodic maintenance, inspect probe housing integrity, outer cable jacket abrasion and connector locking tightness regularly to eliminate intermittent signal loss caused by loose connection or oil infiltration after jacket rupture. Only spare probe with identical full part number can be used for direct replacement; any modification on tip structure, housing dimension or built-in cable length will change total closed-loop capacitance and lead to invalid monitoring data. All alternative replacement probes complete full parameter recalibration and alternating high-low temperature aging test per original factory standard before delivery to ensure full interchangeability during equipment overhaul.