Bently Nevada 24765-02-00 Proximitor Preamplifier Product Specification
24765-02-00 is factory pre-calibrated standalone proximitor preamplifier designed for Bently 3300XL eddy current proximity transducer system, widely used in power, petrochemical and metallurgical industries for turbomachinery monitoring including steam turbines, turbo-generators, centrifugal compressors and large process blowers. As the core signal conditioning component between field proximity probe and rack vibration monitoring module, this proximitor supplies high-frequency excitation to paired eddy current probe, converts clearance-dependent impedance variation into linear analog DC voltage signal. The conditioned output signal is transmitted to 3300 or 3500 series monitor cards to realize real-time measurement of rotor radial vibration, thrust axial displacement and Keyphasor speed pickup, as well as over-limit alarm and safety interlock protection. Every finished unit passes linearity calibration, insulation resistance inspection and alternating high-low temperature cycling aging test before factory shipment to maintain stable conversion accuracy under harsh field conditions of high ambient temperature, lubricant oil mist and complicated electromagnetic interference near bearing housings and local junction boxes.
Description
Bently Nevada 24765-02-00 Proximitor Preamplifier Product Specification
1. Product Overview
24765-02-00 is factory pre-calibrated standalone proximitor preamplifier designed for Bently 3300XL eddy current proximity transducer system, widely used in power, petrochemical and metallurgical industries for turbomachinery monitoring including steam turbines, turbo-generators, centrifugal compressors and large process blowers. As the core signal conditioning component between field proximity probe and rack vibration monitoring module, this proximitor supplies high-frequency excitation to paired eddy current probe, converts clearance-dependent impedance variation into linear analog DC voltage signal. The conditioned output signal is transmitted to 3300 or 3500 series monitor cards to realize real-time measurement of rotor radial vibration, thrust axial displacement and Keyphasor speed pickup, as well as over-limit alarm and safety interlock protection. Every finished unit passes linearity calibration, insulation resistance inspection and alternating high-low temperature cycling aging test before factory shipment to maintain stable conversion accuracy under harsh field conditions of high ambient temperature, lubricant oil mist and complicated electromagnetic interference near bearing housings and local junction boxes.
2. Part Number Definition Breakdown
Each segmented code of 24765-02-00 represents fixed factory configuration parameters. 24765 is the base series code of standard standalone proximitor matching 3300XL proximity probe assemblies; the middle segment 02 defines preset calibrated sensitivity specification, internal circuit layout and applicable matching probe model range; the last segment 00 stands for specific hardware revision, terminal definition and enclosure structure variant. Any proximitor with different suffix digits has different factory calibration parameters and cannot be directly replaced on-site without professional recalibration, which would lead to measurement deviation of the entire transducer loop.
3. Core Functional Characteristics
Adopting high-frequency oscillating eddy current signal processing circuit, the proximitor provides stable high-frequency drive signal for connected proximity probe and linearly transforms gap change between probe tip and metallic target into proportional voltage output. Built-in multi-stage filtering circuit suppresses power-frequency interference and high-frequency clutter from nearby high-voltage cables and frequency conversion equipment to reduce signal distortion during long-distance cable transmission. Fully sealed metal casing features outstanding oil-proof, dust-proof and shock-resistant performance, suitable for installation inside local junction boxes close to hot equipment bearing chambers. When matched with factory-certified proximity probe and calibrated extension cable, the complete measurement system keeps fixed linear characteristic, allowing backend monitor modules to set pre-alarm and dangerous trip thresholds for equipment overload protection. Abnormal open or short circuit of field probe loop can be judged via abnormal output voltage drift for convenient field troubleshooting.
4. Electrical and Metrological Specifications
The proximitor operates on standard regulated negative DC supply from -17.5VDC to -26VDC, fed from corresponding rack monitoring module or dedicated system power supply. Its sensitivity and linear measuring range are strictly locked via factory calibration according to part configuration, matching designated 3300XL proximity probe specification. Premium internal insulation components effectively lower temperature drift and leakage current to guarantee stable conversion precision under normal ambient temperature fluctuation. Standard screw terminal layout facilitates field wiring of power supply, probe cable and signal output lines; cutting or substituting non-calibrated unmatched cables will invalidate original factory calibration data of the whole measuring circuit.
5. Environmental Working Parameters
Continuous allowable operating temperature of the proximitor ranges from -40°C up to +121°C to adapt high-temperature installation near heated machinery bearing positions. Spare storage temperature is controlled between -55°C and +85°C under dry non-condensing storage environment; applicable working relative humidity covers 5%RH~95%RH, and dew condensation inside metal housing is strictly prohibited to avoid internal circuit corrosion and short-circuit failure. The unit can withstand regular industrial vibration of 10Hz~2kHz generated by running rotating equipment. Long-term continuous exposure to strong corrosive gas and persistent hot steam immersion is forbidden to extend service life of internal electronic components. For installation above 1000 meters altitude, properly shorten routine inspection cycle.
6. Installation and Routine Maintenance Guidance
The metal housing is reserved with fixed mounting holes for bolt fastening onto flat junction box base or equipment mounting bracket. During field wiring construction, separate signal cables from high-voltage power lines to avoid cross electromagnetic interference and fully fasten all terminal screws to prevent intermittent signal fluctuation caused by loose terminals. In periodic maintenance work, regularly check casing integrity, terminal tightening status and surrounding oil accumulation situation. If field replacement is required after component failure, only spare part with identical full part number 24765-02-00 is permitted for direct swap. All replacement preamplifiers complete full factory electrical testing and temperature aging screening before delivery to ensure complete interchangeability during equipment overhaul.
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