Bently Nevada 24134-02 Eddy Current Proximitor Product Specification
24134-02 is a factory pre-calibrated standard-range proximitor belonging to Bently Nevada classic 7200 series eddy-current transducer system, specially matched with standard 25mm diameter proximity probes and certified factory-calibrated extension cables for non-contact clearance and displacement measurement. Serving as core signal conditioning unit between field-mounted proximity probes and rack-based 7200 or 3500 series monitoring modules, this proximitor generates high-frequency excitation signal to drive paired eddy-current probes and converts tiny gap variation between probe tip and metallic rotating target into proportional linear DC voltage output. The converted analog signal is transmitted to backend monitor cards to realize continuous online measurement of shaft radial vibration, rotor axial thrust position and minor valve stem travel parameters. Widely deployed on steam turbines, heavy-duty gas turbines, petrochemical centrifugal compressors and large industrial generator sets, it supports equipment over-limit pre-alarm and emergency trip interlock for unit safety protection. Every finished unit undergoes strict linearity calibration, high-low temperature cycle aging test and insulation resistance inspection before factory delivery to maintain stable measuring precision under harsh working conditions including high bearing housing temperature, lubricating oil mist and complex on-site electromagnetic interference.
Description
Bently Nevada 24134-02 Eddy Current Proximitor Product Specification
1. Product Overview
24134-02 is a factory pre-calibrated standard-range proximitor belonging to Bently Nevada classic 7200 series eddy-current transducer system, specially matched with standard 25mm diameter proximity probes and certified factory-calibrated extension cables for non-contact clearance and displacement measurement. Serving as core signal conditioning unit between field-mounted proximity probes and rack-based 7200 or 3500 series monitoring modules, this proximitor generates high-frequency excitation signal to drive paired eddy-current probes and converts tiny gap variation between probe tip and metallic rotating target into proportional linear DC voltage output. The converted analog signal is transmitted to backend monitor cards to realize continuous online measurement of shaft radial vibration, rotor axial thrust position and minor valve stem travel parameters. Widely deployed on steam turbines, heavy-duty gas turbines, petrochemical centrifugal compressors and large industrial generator sets, it supports equipment over-limit pre-alarm and emergency trip interlock for unit safety protection. Every finished unit undergoes strict linearity calibration, high-low temperature cycle aging test and insulation resistance inspection before factory delivery to maintain stable measuring precision under harsh working conditions including high bearing housing temperature, lubricating oil mist and complex on-site electromagnetic interference.
2. Part Number Coding Explanation
The base model code 24134 stands for fixed 25mm full-scale dedicated proximitor platform of the 7200 product lineup, with internal circuit preset exclusively for 25mm specification proximity probe matching and cannot be directly matched with 8mm or 50mm oversized probes without factory recalibration. The suffix number 02 defines unit mechanical structure, internal circuit layout and locked factory calibration edition; this version adopts standard screw-fixed metal enclosed housing, general non-explosion-proof circuit design and fixed sensitivity parameters customized for 25mm full-span measurement. Alternative suffix variants such as 24134-01 or 24134-03 carry different preset calibration coefficients and mechanical structure parameters, random on-site replacement will cause obvious measurement deviation and unexpected false shutdown of critical rotating equipment protection loop.
3. Core Product Features
Adopting high-stability high-frequency oscillation circuit with high temperature resistant electronic components, this proximitor provides consistent high-frequency drive signal for matched 25mm eddy-current probe and completes linear conversion from gap change to DC analog voltage within rated effective measuring range. Built-in multi-stage passive filtering circuit effectively filters out power frequency clutter and high-frequency interference introduced by surrounding frequency converters and high-current power cables, ensuring complete signal integrity during long-distance calibrated extension cable transmission. Fully sealed die-cast aluminum metal casing delivers outstanding dust-proof, oil-proof and anti-vibration capability, adapting compact installation inside field junction boxes near high-temperature bearing pedestals and equipment cylinder casings. Integrated open-circuit and short-circuit self-diagnosis function reflects abnormal field wiring status via distinct output voltage offset, greatly simplifying regular on-site inspection and troubleshooting work. Only when assembled with original certified 25mm proximity probe and designated factory-calibrated extension cable can the complete transducer system retain original factory calibration data; non-standard self-matched cables will permanently invalidate pre-set calibration parameters.
4. Electrical and Calibration Technical Specifications
The rated working DC power supply ranges from -17.5 VDC to -26 VDC negative power, standard on-site operating voltage is -24 VDC supplied by rack monitoring power source or independent regulated DC power module. Factory locked fixed sensitivity is 0.787 V/mm (20 mV/mil) specially tailored for matched 25mm proximity probe, overall linearity error is controlled within ±5% complying with API 670 industrial machinery monitoring specification. Valid linear measuring range covers 2.5 mm to 27.5 mm with total full span of 25 mm for small-stroke displacement and vibration monitoring. Output signal includes DC component for static axial position reading and AC component for dynamic shaft vibration data collection, effective frequency response spans from DC up to 9 kHz to satisfy both slow thermal expansion long-period measurement and high-frequency dynamic vibration acquisition demands. Standard multi-position screw terminal blocks are reserved separately for power input, probe cable access and analog signal output connection; all terminal screws need full tightening during field wiring to avoid intermittent signal fluctuation induced by poor contact.
5. Environmental Working Parameters
Continuous permissible operating ambient temperature ranges from -40℃ to +121℃ to adapt high-temperature installation near heated equipment bearing housings and turbine casings; spare storage ambient temperature is controlled between -55℃ and +85℃ under dry non-condensation storage environment. Applicable working relative humidity is 5%RH ~95%RH, internal condensation inside metal enclosure is strictly prohibited to avoid internal circuit corrosion and short-circuit failure. The proximitor can withstand continuous ambient vibration of 10 Hz ~ 2.2 kHz generated by adjacent running rotating machinery; long-term exposure to corrosive acid gas and continuous hot steam soaking is forbidden to extend internal electronic component service life. For installation locations above 1000 meters altitude, shorten regular maintenance inspection cycle appropriately to monitor real-time working performance.
6. Installation and Daily Maintenance Guidance
Pre-machined fixing holes on metal casing allow rigid bolt fastening onto junction box base or custom-designed installation bracket. During on-site wiring construction, separate sensor signal cables from high-current AC power wiring to reduce cross electromagnetic coupling interference between different wiring loops. In regular equipment maintenance cycle, periodically inspect casing surface integrity, terminal screw fastening tightness and oil dirt accumulation around installation position. When on-site unit malfunctions and requires spare replacement, only identical full part number 24134-02 spare part is permitted for direct plug-and-play swap. All replacement proximitors complete full electrical performance testing and alternating high-low temperature aging screening before factory shipment to guarantee complete interchangeability during system overhaul and field maintenance.
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