Bently Nevada 24583-02 Proximitor Preamplifier Product Specification
24583-02 is a factory pre-calibrated dedicated proximitor preamplifier from Bently Nevada’s large-range eddy current transducer family, specially configured for 50 mm oversized proximity probe assemblies used for differential expansion and axial displacement measurement. As the core signal conditioning component between field-installed 50 mm eddy current probes and rack-mounted 3300 / 3500 series monitoring modules, this unit generates high-frequency excitation to drive paired probes and converts clearance-dependent impedance variation into linear DC analog voltage output. Processed signals are transmitted to backend monitor boards for continuous measurement of turbo-machinery axial thrust, casing differential expansion and valve rod travel on steam turbines, gas turbines and large petrochemical compressors, supporting over-limit pre-alarm and emergency trip interlock for equipment protection. Every finished product undergoes linearity calibration, insulation withstand testing and high-low temperature cyclic aging before factory delivery to ensure stable measurement precision under harsh field conditions including high ambient temperature, heavy lubricant oil mist and complex electromagnetic interference near high-temperature bearing housings and local junction boxes.
Description
Bently Nevada 24583-02 Proximitor Preamplifier Product Specification
1. Product Overview
24583-02 is a factory pre-calibrated dedicated proximitor preamplifier from Bently Nevada’s large-range eddy current transducer family, specially configured for 50 mm oversized proximity probe assemblies used for differential expansion and axial displacement measurement. As the core signal conditioning component between field-installed 50 mm eddy current probes and rack-mounted 3300 / 3500 series monitoring modules, this unit generates high-frequency excitation to drive paired probes and converts clearance-dependent impedance variation into linear DC analog voltage output. Processed signals are transmitted to backend monitor boards for continuous measurement of turbo-machinery axial thrust, casing differential expansion and valve rod travel on steam turbines, gas turbines and large petrochemical compressors, supporting over-limit pre-alarm and emergency trip interlock for equipment protection. Every finished product undergoes linearity calibration, insulation withstand testing and high-low temperature cyclic aging before factory delivery to ensure stable measurement precision under harsh field conditions including high ambient temperature, heavy lubricant oil mist and complex electromagnetic interference near high-temperature bearing housings and local junction boxes.
2. Part Number Definition Breakdown
24583 is the base series code representing fixed 50 mm full-span dedicated proximitor platform designed exclusively for 50 mm diameter large-range proximity probes, not compatible with 8 mm or 25 mm standard-size probes. The suffix 02 defines fixed factory parameters including internal circuit layout, locked calibration scale factor, terminal definition and metal enclosure hardware revision. Units with different suffix codes such as 24583-03 carry different preset calibration values and cannot be directly replaced on-site without full-loop recalibration, which would result in severe measurement drift and false equipment protection action.
3. Core Functional Characteristics
Equipped with high-temperature resistant high-frequency oscillating circuit, the proximitor supplies stable excitation for matched 50 mm eddy current probes and linearly translates physical gap changes into proportional DC voltage within designated full linear span. Built-in multi-stage filter network suppresses power-frequency interference and high-frequency clutter from adjacent high-voltage cables and variable frequency drives to avoid signal distortion during long-distance transmission of factory-calibrated extension cables. Fully sealed cast aluminum housing delivers excellent oil-proof, dust-proof and anti-vibration performance, enabling compact installation inside field junction boxes close to hot turbine casings and bearing chambers. When matched with original certified 50 mm proximity probe and designated calibrated extension cable, the complete transducer system maintains fixed linear characteristic, allowing rack monitor modules to set independent warning and shutdown thresholds for critical machinery protection. Open-circuit or short-circuit faults of field wiring can be quickly identified via abnormal output voltage shift to facilitate on-site troubleshooting.
4. Electrical and Metrological Specifications
The proximitor requires regulated negative DC supply ranging from -17.5 VDC to -26 VDC, with typical field operating voltage at -24 VDC sourced from rack monitor power output or dedicated regulated DC power unit. Factory locked sensitivity is 0.394 V/mm (10 mV/mil) customized for 50 mm probes, with overall linearity tolerance controlled within ±5% in accordance with API 670 specification. Its effective linear measuring range covers 5 mm to 55 mm full span for large stroke displacement measurement. The output signal consists of DC component for static displacement reading and AC component for dynamic vibration collection, with frequency response from DC up to 8 kHz to satisfy both slow thermal expansion monitoring and high-frequency vibration measurement demands. Standard screw terminal blocks are available for orderly wiring of power supply, probe input cable and signal output cable; replacement with non-original uncalibrated cables will invalidate original factory calibration permanently.
5. Environmental Working Parameters
Continuous permissible operating ambient temperature ranges from -40°C to +121°C to fit high-temperature installation near heated turbine and compressor bearing positions. Spare storage temperature is maintained between -55°C and +85°C under dry non-condensing storage environment; applicable working relative humidity is 5%RH~95%RH, and internal condensation inside metal enclosure is strictly forbidden to prevent internal circuit corrosion and short-circuit faults. The device can withstand regular industrial vibration of 10 Hz ~ 2 kHz from nearby running rotating equipment. Long-term continuous exposure to strong corrosive gas and persistent hot steam immersion is prohibited to extend internal component service life. For installation above 1000 meters altitude, shorten periodic inspection cycle appropriately.
6. Installation and Routine Maintenance Guidance
Pre-reserved mounting holes on metal casing enable bolt fixing onto flat junction box base or custom mounting bracket. During field wiring construction, separate signal cables away from high-current AC power lines to minimize cross electromagnetic interference and fully tighten all terminal screws to avoid intermittent signal fluctuation caused by loose contact. In regular maintenance cycles, periodically check housing integrity, terminal fastening condition and oil accumulation around installation location. When replacement is needed after unit failure, only spare part with identical full part number 24583-02 is allowed for direct swap. All replacement proximitors complete full electrical testing and alternating temperature aging screening before delivery to ensure complete interchangeability during equipment overhaul.
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