Bently Nevada 30001-00-34-18-02 Eddy Current Proximity Probe Product Specification

30001-00-34-18-02 is a factory pre-calibrated eddy-current proximity probe from Bently Nevada 30001 series, designed in accordance with API670 standard for TSI rotating machinery supervision and protection system. When assembled with matched calibrated extension cable and corresponding proximitor transducer, it forms a complete closed-loop non-contact measurement system. The probe converts tiny clearance variation between sensing head and metallic rotating shaft into proportional linear DC voltage signals, enabling continuous online monitoring of radial shaft vibration, axial thrust displacement and Keyphasor rotational speed for critical rotating equipment including steam turbines, centrifugal compressors, large generator sets, boiler feed pumps and industrial blowers across thermal power, petrochemical refining and metallurgical industries. Every finished probe undergoes strict factory capacitance matching test, continuity inspection, high-low temperature cycling aging and connector sealing durability verification before shipment to guarantee stable linearity and consistent measuring accuracy under complicated industrial environments with fluctuating temperature, heavy lubricating oil mist and complex electromagnetic interference. Processed measuring signals are transmitted to Bently 3500 monitoring rack, field DCS or PLC control system to trigger pre-alarm and emergency trip interlock and avoid severe catastrophic mechanical breakdown of production units.

The five-segment part number follows Bently’s standardized modular coding specification with independent fixed parameter definition for each field:30001 represents core series designation for proximity probe with 11mm body diameter and standard M14×2 mounting thread, factory preset nominal sensitivity at 3.94V/mm and compatible with 3500 and 3300 series proximitor transducers.00 stands for zero exposed unthreaded sensing tip length, meaning the sensing head surface is flush with the starting plane of mounting thread without bare protruding tip, specially applicable for bearing housings requiring flush installation without protruding probe head into oil chamber.34 defines total probe metal housing length of 340 millimeters, customized for relatively deep installation cavities on thick equipment bearing casings.18 specifies factory pre-integrated built-in probe cable length of 1.8 meters; this fixed length is fully calculated into total loop capacitance matching together with matched extension cable and supporting proximitor, arbitrary on-site cutting or replacement with unmatched cable will destroy original impedance balance and cause measurement zero drift and non-linear output error.02 indicates standard cable and terminal configuration: non-armored fluoropolymer outer cable jacket equipped with gold-plated standard ClickLoc stainless steel threaded connector at cable end, without additional metal armor sheath or customized modified plug structure. All specification parameters are locked after factory production and cannot be altered arbitrarily on installation site.

The probe’s internal sensing coil core is manufactured from high-precision stable alloy material and wrapped with high-temperature resistant modified PPS insulating layer, which features steady dielectric constant, outstanding oil resistance and anti-corrosion property to maintain fixed capacitance value amid variable ambient temperature and persistent workshop oil mist. Probe outer housing adopts precision CNC-machined solid stainless steel with excellent anti-collision, anti-rust and anti-high-temperature steam performance for long-term service near hot-running equipment casing. Internal signal transmission conductors are constructed with multi-strand oxygen-free copper to minimize high-frequency signal attenuation and improve anti-RFI interference performance during signal delivery. Intermediate insulating layer uses fluoropolymer material with consistent dielectric property satisfying eddy-current measurement working principle. Outer protective jacket of integrated cable is made of wear-resistant thermoplastic elastomer to resist on-site mechanical scratch, dust accumulation and lubricant soaking erosion. The tail-end stainless steel connector is fitted with built-in elastic rubber sealing ring to block moisture, fine metal scraps and hydraulic oil from penetrating into internal wiring junction after mating with matched extension cable terminal. The integral cable retains proper flexible bending property to facilitate convenient routing along equipment surface and cable trench without insulation cracking under specified minimum bending radius.

This proximity probe must be matched with designated compatible proximitor powered by negative DC supply ranging from -17.5VDC to -26VDC. The full measurement loop consisting of probe, certified extension cable and supporting proximitor keeps factory-calibrated fixed sensitivity of 3.94V/mm, with effective frequency response spanning from 0Hz up to 10kHz to satisfy both slow static axial thrust displacement tracking and high-frequency dynamic radial vibration sampling of high-speed rotating rotors.

Permitted continuous operating ambient temperature ranges from -40℃ to +120℃, adapting low-temperature outdoor equipment layout and high-temperature installation nearby turbine and compressor hot bearing housings; recommended dry storage temperature is controlled within -55℃ ~ +95℃ under fully non-condensing storage surroundings. Applicable working relative humidity is limited between 5%RH and 95%RH with no internal condensation allowed inside probe body and cable structure to avoid insulation degradation and inner core short-circuit fault. When installed above 1000 meters altitude, properly shorten regular inspection cycle to compensate heat dissipation reduction caused by thin atmospheric air. The probe withstands regular industrial ambient vibration of 10Hz~60Hz; long-term continuous service in environments filled with strong corrosive chemical gas and uninterrupted hot steam immersion is strictly prohibited to extend operational service life of all internal components.

30001-00-34-18-02 flush-type proximity probes are widely mounted on bearing pedestals of large-scale rotating equipment for TSI protection system configuration in power plants, oil refineries and heavy metallurgy projects, collecting real-time shaft clearance and vibration data to realize abnormal equipment condition alarming and unit emergency shutdown interlock protection, effectively preventing severe mechanical faults triggered by excessive rotor displacement or abnormal vibration amplitude.

During routine field maintenance work, operators need periodic visual inspection of probe housing integrity, outer cable jacket abrasion status and connector fastening tightness to avoid intermittent signal loss induced by loose connection or jacket rupture leading to oil infiltration inside internal wiring. For breakdown spare replacement, only spare probe with identical full complete part number specification is allowed for direct swap; mismatched flush tip design, housing dimension or built-in cable length will alter total loop capacitance and result in monitoring data distortion and invalid measured values. All alternative replacement probes complete full electrical parameter recalibration and alternating high-low temperature cycling aging test in accordance with original factory standards before outgoing delivery to guarantee full interchangeability during equipment overhaul and spare part replacement.