Bently Nevada 30004-02-12-12-02 Eddy Current Proximity Probe Product Specification
30004-02-12-12-02 is factory pre-calibrated eddy-current proximity probe from Bently Nevada 30004 series complying with API670 standard for rotating machinery protection. Combined with matched extension cable and dedicated proximitor transducer, it builds up a complete non-contact clearance measurement system for TSI supervisory instrumentation. It converts tiny clearance changes between probe tip and metallic rotating shaft into standard linear voltage signals to realize continuous online monitoring of radial shaft vibration, axial thrust displacement and Keyphasor rotational speed on steam turbines, centrifugal compressors, feedwater pumps, blowers and generator sets in power, petrochemical and metallurgical industries. Each finished probe undergoes factory capacitance matching, continuity test, high-low temperature cycling aging and connector sealing inspection before delivery to guarantee stable linearity and measuring accuracy under complex industrial temperature fluctuation and electromagnetic interference. Measurement signals are transmitted to Bently 3500 rack modules, DCS or PLC for threshold alarm and emergency trip interlock control against severe mechanical failure.
Description
Bently Nevada 30004-02-12-12-02 Eddy Current Proximity Probe Product Specification
1. Product Overview
30004-02-12-12-02 is factory pre-calibrated eddy-current proximity probe from Bently Nevada 30004 series complying with API670 standard for rotating machinery protection. Combined with matched extension cable and dedicated proximitor transducer, it builds up a complete non-contact clearance measurement system for TSI supervisory instrumentation. It converts tiny clearance changes between probe tip and metallic rotating shaft into standard linear voltage signals to realize continuous online monitoring of radial shaft vibration, axial thrust displacement and Keyphasor rotational speed on steam turbines, centrifugal compressors, feedwater pumps, blowers and generator sets in power, petrochemical and metallurgical industries. Each finished probe undergoes factory capacitance matching, continuity test, high-low temperature cycling aging and connector sealing inspection before delivery to guarantee stable linearity and measuring accuracy under complex industrial temperature fluctuation and electromagnetic interference. Measurement signals are transmitted to Bently 3500 rack modules, DCS or PLC for threshold alarm and emergency trip interlock control against severe mechanical failure.
2. Part Number Coding Definition
The five-segment part number follows Bently standardized coding rules:30004 refers to core series for 12mm outer diameter proximity probe with standard mounting thread for general heavy-duty machinery monitoring.02 means exposed bare sensing tip length is 2mm, the exposed detecting section from probe head to the start of mounting thread for narrow compact installation holes on bearing housings.12 stands for overall probe housing length of 120mm, designed for regular shallow mounting cavities of most standard bearing pedestals.12 defines factory fixed pre-integrated probe cable length of 1.2 meters; this length is included into total loop capacitance calculation together with extension cable and proximitor, arbitrary cutting or mismatched cable replacement will break impedance matching and result in measuring drift and non-linear error.02 represents standard configuration: non-armored fluoropolymer outer cable jacket plus gold-plated standard stainless steel threaded connector at cable end without customized metal armor sheath. All parameter settings are locked during production and cannot be modified randomly on site.
3. Mechanical and Material Specification
Probe sensing core is made of high-precision alloy wrapped with high-temperature resistant PPS insulation featuring stable dielectric constant, outstanding oil and chemical corrosion resistance to keep fixed capacitance under oil mist and variable ambient temperature. Probe outer housing adopts precision machined solid stainless steel for excellent anti-impact, anti-rust and anti-high-temperature steam performance near hot equipment casing. Internal multi-strand oxygen-free copper conductors reduce high-frequency signal attenuation and improve anti-electromagnetic interference ability. Intermediate fluoropolymer insulation maintains steady dielectric property to meet eddy-current working requirements. Outer cable jacket uses wear-resistant elastomer to resist scratch, oil soaking and dust erosion at workshop site. Tail stainless steel connector is fitted with built-in rubber sealing ring to prevent moisture, metal powder and lubricating oil from penetrating into internal wiring after coupling with extension cable. The integrated cable keeps proper flexibility for convenient field wiring within specified minimum bending radius without insulation cracking.
4. Electrical Performance and Environmental Parameters
This probe matches supporting proximitor with operating supply from -17.5VDC to -26VDC negative DC power. The complete measuring loop consisting of probe, qualified extension cable and proximitor retains factory preset calibrated sensitivity, with effective frequency response ranging 0Hz~10kHz to collect both slow static axial drift and high-frequency dynamic radial vibration of high-speed rotors.
Permitted continuous operating ambient temperature ranges from -40℃ to +120℃ for low-temperature outdoor and high-temperature near-equipment installation; storage temperature is -55℃ ~ +95℃ under dry non-condensing environment. Working relative humidity is controlled 5%RH~95%RH without internal condensation to avoid insulation aging and inner core short-circuit. For installation altitude above 1000 meters, shorten regular inspection cycle properly due to thinner air and reduced heat dissipation. The probe withstands industrial vibration 10Hz~60Hz; long-term usage in surroundings with strong corrosive gas and persistent chemical vapor is prohibited to extend service life.
5. Application Scope and Routine Maintenance Guidance
30004-02-12-12-02 proximity probes are widely installed on bearing housings of critical rotating equipment in power plants, refineries and metallurgical factories as core sensing parts of TSI protection system for real-time vibration and displacement monitoring.
During regular maintenance, inspect probe housing integrity, outer cable abrasion and connector tightness regularly to avoid intermittent signal loss caused by loose connection or damaged jacket and oil infiltration. For fault replacement, only spare probe with identical full part number can be used; mismatched built-in cable length or tip dimension changes total loop capacitance and causes invalid monitoring data. All aftermarket refurbished probes complete full capacitance calibration, temperature cycling and sealing test per original factory standards before delivery to ensure interchangeability during equipment overhaul.
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