Bently Nevada 30000-00-72-36-02 Eddy Current Proximity Probe Product Specification
30000-00-72-36-02 is a factory pre-calibrated flush-type eddy-current proximity probe from Bently Nevada’s 30000 series, manufactured in compliance with API670 industrial standard for TSI rotating machinery supervision and safety protection systems. When matched with factory-certified extension cable and corresponding proximitor transducer, the unit forms a full closed-loop non-contact displacement measurement circuit. It converts tiny clearance variation between flush sensing end face and metallic rotating shaft into proportional linear DC voltage signals to continuously monitor radial shaft vibration, axial thrust displacement and Keyphasor rotational speed. Typical applicable equipment includes steam turbines, centrifugal compressors, turbo-generator sets, boiler feedwater pumps and industrial blowers used in thermal power, petrochemical refining and metallurgical industries. Each finished probe undergoes factory capacitance matching test, electrical continuity inspection, alternating high-low temperature cycling aging and connector sealing durability test before shipment to maintain stable linear performance and reliable measuring accuracy under complex industrial conditions with fluctuating temperature, heavy lubricant mist and complicated electromagnetic interference. Measured signals are delivered to Bently 3500 monitoring rack, on-site DCS or PLC control system to activate pre-alarm and emergency trip interlock, preventing severe mechanical breakdown induced by excessive rotor deflection or abnormal vibration amplitude.
Description
Bently Nevada 30000-00-72-36-02 Eddy Current Proximity Probe Product Specification
1. Product Overview
30000-00-72-36-02 is a factory pre-calibrated flush-type eddy-current proximity probe from Bently Nevada’s 30000 series, manufactured in compliance with API670 industrial standard for TSI rotating machinery supervision and safety protection systems. When matched with factory-certified extension cable and corresponding proximitor transducer, the unit forms a full closed-loop non-contact displacement measurement circuit. It converts tiny clearance variation between flush sensing end face and metallic rotating shaft into proportional linear DC voltage signals to continuously monitor radial shaft vibration, axial thrust displacement and Keyphasor rotational speed. Typical applicable equipment includes steam turbines, centrifugal compressors, turbo-generator sets, boiler feedwater pumps and industrial blowers used in thermal power, petrochemical refining and metallurgical industries. Each finished probe undergoes factory capacitance matching test, electrical continuity inspection, alternating high-low temperature cycling aging and connector sealing durability test before shipment to maintain stable linear performance and reliable measuring accuracy under complex industrial conditions with fluctuating temperature, heavy lubricant mist and complicated electromagnetic interference. Measured signals are delivered to Bently 3500 monitoring rack, on-site DCS or PLC control system to activate pre-alarm and emergency trip interlock, preventing severe mechanical breakdown induced by excessive rotor deflection or abnormal vibration amplitude.
2. Part Number Coding Definition
The five-segment part number follows Bently standardized modular coding rules with fixed definition per field:30000 stands for core probe series with 11mm outer body diameter and standard M14×2 mounting thread, factory fixed sensitivity of 3.94V/mm and fully compatible with Bently 3300 and 3500 series proximitors.00 means zero exposed unthreaded sensing tip; the detection surface is flush with thread end plane without protruding bare tip, designed for flush mounting on bearing housings that forbid any probe extension into internal lubricant chamber.72 defines total stainless steel probe housing length of 720mm, customized for extra-deep installation cavities on thick heavy-duty bearing pedestals of large-size rotating machines.36 specifies factory pre-integrated built-in probe cable length of 3.6 meters; this fixed length is included into full-loop capacitance calculation together with matched extension cable and proximitor. Arbitrary on-site cutting or mismatched cable replacement will break preset impedance matching and cause measurement zero drift and non-linear measuring error.02 represents standard configuration: non-armored fluoropolymer outer cable jacket plus gold-plated standard ClickLoc stainless steel threaded connector at cable end, without outer metal armor or custom modified plug structure. All mechanical and electrical parameters are fixed after factory production and cannot be altered arbitrarily on installation site.
3. Mechanical and Raw Material Specifications
The internal sensing coil core is made of high-stability precision alloy wrapped with high-temperature resistant PPS insulating material featuring stable dielectric constant, excellent oil resistance and anti-corrosion property to keep fixed capacitance under variable ambient temperature and long-term oil mist immersion. Probe outer housing is precision CNC-machined solid stainless steel with outstanding anti-shock, rust-proof and high-temperature steam resistant performance for long-term installation close to hot-running equipment casing. Internal multi-strand oxygen-free copper conductors reduce high-frequency signal attenuation and improve anti-RFI interference capacity. Intermediate fluoropolymer insulation maintains steady dielectric property matching eddy-current working requirements. Outer cable jacket is wear-resistant thermoplastic elastomer to resist field scratch, dust accumulation and lubricant soaking erosion. The tail stainless steel connector is equipped with built-in elastic rubber sealing ring to block moisture, fine metal scraps and hydraulic oil from penetrating inner wiring after mating with matched extension cable terminal. The integral cable keeps proper flexibility for convenient field wiring within specified minimum bending radius without insulation cracking.
4. Electrical Performance and Environmental Working Parameters
This probe must be paired with matched proximitor powered by negative DC supply ranging from -17.5VDC to -26VDC. The complete measuring loop of probe, certified extension cable and supporting proximitor retains factory-calibrated sensitivity of 3.94V/mm, with effective frequency response from 0Hz to 10kHz to cover both slow static axial displacement tracking and high-frequency dynamic radial vibration sampling of high-speed rotors.
Permitted continuous operating ambient temperature ranges from -40℃ to +120℃ for low-temperature outdoor installation and high-temperature layout near hot bearing housings; dry storage temperature spans -55℃ ~ +95℃ under non-condensing surroundings. Working relative humidity is controlled between 5%RH and 95%RH with no internal condensation allowed to avoid insulation deterioration and inner core short-circuit. When installed above 1000 meters altitude, shorten regular inspection cycle properly due to reduced heat dissipation in thin air. The probe withstands regular industrial vibration of 10Hz~60Hz; long-term continuous operation in environments with strong corrosive gas and uninterrupted hot steam is strictly prohibited to extend component service life.
5. Application Scope and Routine Maintenance Guidance
30000-00-72-36-02 ultra-long flush-mounted proximity probes are widely installed on deep-hole bearing pedestals of large rotating equipment as core sensing parts of TSI protection systems in power plants, refineries and metallurgical workshops for real-time vibration and clearance monitoring.
During regular maintenance, periodically check probe housing integrity, outer cable abrasion and connector fastening tightness to avoid intermittent signal loss caused by loose connection or jacket damage and subsequent oil infiltration. For fault replacement, only spare probe with identical full part number can be used; any change of flush tip structure, housing length or built-in cable length will alter total loop capacitance and lead to distorted measuring data. All refurbished replacement probes complete full capacitance recalibration, load aging and alternating high-low temperature shock test complying with original factory standards before delivery to guarantee full interchangeability during equipment overhaul.
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