Bently Nevada 30004-02-12-36-01 Eddy Current Proximity Probe Product Specification

30004-02-12-36-01 is factory pre-calibrated eddy-current proximity probe from Bently Nevada 30004 standard series, designed to form a complete non-contact displacement measuring system with matched extension cable and dedicated proximitor transducer for TSI turbine supervisory instrumentation system. This probe is engineered to continuously monitor radial shaft vibration, axial thrust position and Keyphasor rotational speed of critical rotating equipment including steam turbines, centrifugal compressors, large generator sets, feed water pumps and industrial blowers within thermal power, petrochemical refining and metallurgical processing industries. Each unit passes strict factory capacitance matching, continuity inspection, high-low temperature cycling test and connector sealing check before delivery to secure stable linear output and consistent measuring precision under complicated industrial electromagnetic interference and drastic ambient temperature changes. Converted gap variation into proportional linear voltage signal, the probe feeds measurement data to Bently 3500 monitoring chassis or on-site DCS/PLC to implement over-limit alarm and emergency trip interlock protection for rotating machinery safety control.

The five-section part number follows fixed Bently coding specification with independent parameter definition per field:30004 represents core series code for 12mm diameter standard proximity probe with standard metric mounting thread, belonging to optimized eddy current sensor structure complying with API670 industrial standard for machinery protection system.02 stands for exposed unthreaded sensing tip length at 2mm, referring to bare detection segment from probe head to starting point of mounting thread, applicable for compact narrow installation bore space at bearing pedestal.12 defines overall probe housing length of 120mm, customized for standard shallow mounting cavity layout of most conventional bearing housings.36 indicates pre-integrated factory-calibrated built-in probe cable length of 3.6 meters; this fixed length is calculated into total loop capacitance together with extension cable and proximitor, random field cutting or length replacement will destroy original impedance matching and cause measurement zero drift and non-linear error.01 denotes standard cable structure and terminal configuration: fitted with standard threaded stainless steel ClickLoc connector without gold-plated optimized contact layout, outer cable is non-armored fluoropolymer insulation jacket, differing from suffix 02 version with gold-plated connector; no customized special plug or armored sheath is equipped on this model. All coding parameters are finalized during production and cannot be modified arbitrarily on installation site.

Probe sensing head core adopts high-precision alloy material wrapped with high-temperature resistant PPS insulating layer featuring stable dielectric constant, outstanding oil resistance and anti-corrosion property to maintain fixed capacitance under fluctuating temperature and oil mist environment. Probe outer housing is precision machined solid stainless steel for excellent anti-collision, anti-oil and anti-steam corrosion performance near high-temperature equipment casing. Internal transmission conductor uses multi-strand oxygen-free copper to lower high-frequency signal attenuation and improve anti-electromagnetic interference during signal delivery; intermediate insulating layer adopts fluoropolymer material with steady dielectric property required by eddy current measuring principle. Outer protective jacket of integrated cable is made of wear-resistant thermoplastic elastomer to resist mechanical scratch, workshop dust accumulation and lubricant soaking. End-mounted stainless steel connector is equipped with built-in elastic rubber sealing ring to block moisture, fine metal scrap and hydraulic oil permeating into internal wiring junction after mating with extension cable terminal. The attached cable retains appropriate flexible bending performance to facilitate field wiring along cable trench without insulation cracking under regulated minimum bending radius.

This proximity probe matches with corresponding series proximitor powered by DC supply ranging from -17.5VDC to -26VDC. The full measuring loop assembled by probe, matched extension cable and proximitor maintains factory-set fixed sensitivity, effective linear measuring range covers 0~5mm standard clearance span, working frequency response ranges from 0Hz up to 10kHz to satisfy both static slow axial displacement tracking and high-frequency dynamic radial vibration acquisition for high-speed rotating rotors.

Permitted continuous operating ambient temperature spans -40℃ to +120℃, adapting low-temperature outdoor installation and high-temperature layout close to hot running bearing housings; dry storage temperature ranges between -55℃ and +95℃ under non-condensing storage surroundings. Applicable working relative humidity is controlled within 5%RH~95%RH with no internal condensation allowed inside probe and cable structure to avoid insulation degradation and inner core short-circuit fault. The probe can withstand regular industrial ambient vibration of 10Hz~60Hz; long-term service in surroundings with strong corrosive chemical gas and continuous hot steam immersion is prohibited to extend operational service life.

30004-02-12-36-01 proximity probes are widely installed on bearing pedestals of large-scale rotating equipment for TSI protection system configuration in power plant, oil refining and heavy metallurgy projects, collecting real-time shaft clearance data to realize equipment abnormal vibration alarming and unit emergency shutdown interlock protection, effectively preventing catastrophic mechanical breakdown caused by excessive rotor displacement or abnormal vibration.

During regular field maintenance, periodically inspect probe shell intactness, outer cable jacket abrasion condition and connector fastening tightness to avoid intermittent signal failure triggered by loose connection or jacket rupture leading to oil infiltration inside internal wiring. For breakdown replacement, only spare probe with identical complete part number specification is allowed for swap; mismatched tip length, housing dimension or built-in cable length will alter total loop capacitance and result in monitoring data distortion and invalid measurement value. All alternative replacement probes complete full electrical parameter recalibration and temperature cycling aging test in accordance with original factory specifications before outgoing delivery to guarantee interchangeability during equipment overhaul and spare part replacement.