Bently Nevada 30001-12-35-36-02 Eddy Current Proximity Probe Product Specification

30001-12-35-36-02 is a factory pre-calibrated eddy-current proximity probe from Bently Nevada’s 30001 product series, manufactured in compliance with API670 industry standard for rotating machinery protection and TSI supervision instrumentation. When assembled with matching calibrated extension cable and designated proximitor transducer, it forms a complete closed-loop non-contact measuring system. The probe converts tiny clearance variation between its sensing tip and metallic rotating shaft into proportional linear DC voltage output, enabling continuous real-time measurement of radial shaft vibration, axial thrust displacement and Keyphasor rotational speed. It is widely equipped on critical rotating assets 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 passes strict factory capacitance matching test, continuity inspection, high-low temperature cycling aging and connector sealing durability verification before shipment to guarantee consistent linear performance and stable measuring precision under complicated industrial conditions with drastic temperature fluctuation, heavy oil mist and complex on-site electromagnetic interference. Collected measurement signals are transmitted to Bently 3500 monitoring rack, local DCS or PLC control system to activate pre-alarm and emergency trip interlock for preventing catastrophic mechanical failure of production equipment.

The five-segment part number follows Bently’s standardized modular coding specification with fixed parameter definition for each field:30001 stands for core series code of proximity probe with 11mm probe body diameter and standard M14×2 mounting thread, featuring factory-set nominal sensitivity of 3.94V/mm, compatible with matched 3500/3300 series proximitor transducers.12 specifies exposed unthreaded sensing tip length of 12 millimeters, referring to the bare detecting segment from probe head surface to the starting position of mounting thread, suitable for bearing housings with deep and spacious installation bore structure.35 defines total probe metal housing length of 350 millimeters, specially customized for deep mounting cavities on thick equipment casings which require long-body probe layout during field installation.36 represents factory pre-attached integral probe cable length of 3.6 meters; this fixed cable length is incorporated into total loop capacitance calculation together with supporting extension cable and proximitor, arbitrary on-site cutting or replacement with unmatched cable will break original impedance matching and result in measurement zero drift and non-linear output error.02 indicates standard cable and terminal configuration: non-armored fluoropolymer outer cable jacket fitted with gold-plated standard ClickLoc stainless steel threaded connector at cable end, without external metal armor sheath or modified customized 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 fabricated from high-precision stable alloy material and wrapped with high-temperature resistant modified PPS insulating layer, which delivers steady dielectric constant, excellent lubricant oil resistance and anti-corrosion capability 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 outstanding mechanical shock resistance, rust-proof property and high-temperature steam erosion tolerance 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 is made of fluoropolymer material with consistent dielectric property that satisfies the operating principle of eddy-current measurement. Outer protective jacket of integrated cable is composed of wear-resistant thermoplastic elastomer to defend against mechanical scratch, dust accumulation and lubricant soaking on site. The tail-end stainless steel connector is equipped 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 maintains appropriate 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 measuring loop composed of probe, certified extension cable and supporting proximitor retains factory-calibrated fixed sensitivity of 3.94V/mm, with effective working frequency response spanning from 0Hz up to 10kHz to cover 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℃ to adapt low-temperature outdoor layout and high-temperature installation nearby hot turbine and compressor 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. For installation sites above 1000 meters altitude, properly shorten regular inspection cycle to compensate heat dissipation reduction caused by thin atmospheric air. The probe can withstand 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.

30001-12-35-36-02 proximity probes are extensively installed on bearing pedestals of large-scale rotating equipment for TSI protection system configuration in power plants, oil refineries and heavy metallurgy workshops, collecting real-time shaft clearance and vibration data to realize abnormal equipment condition alarming and unit emergency shutdown interlock protection, effectively avoiding severe mechanical breakdown triggered by excessive rotor deflection and abnormal axial shifting.

During routine field maintenance work, operators need periodic visual inspection of probe housing integrity, outer cable jacket abrasion status and connector fastening tightness to eliminate 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 permitted for direct swap; mismatched tip length, housing dimension or built-in cable length will alter total loop capacitance and result in monitoring data distortion and invalid measured values. All aftermarket refurbished replacement probes complete full electrical parameter recalibration and alternating high-low temperature cycling aging test in strict accordance with original factory technical standards before outgoing delivery to guarantee full interchangeability during equipment overhaul and spare part replacement.