Bently Nevada 24765-02-01 Proximitor Sensor Preamplifier Specification
24765-02-01 is factory pre-calibrated original proximitor preamplifier unit for Bently Nevada 3300XL eddy current proximity transducer system, widely used on steam turbines, turbo-generators, centrifugal compressors and large industrial blowers across power, petrochemical and metallurgical industries. As the core signal conditioning component between field proximity probe and rack vibration monitor module, this proximitor receives small alternating signals from the eddy current probe, executes high-frequency signal conditioning, linear conversion and impedance matching, and outputs proportional DC analog voltage corresponding to clearance changes between probe tip and metallic target. Processed signals are transmitted to 3300 or 3500 series rack monitor cards for real-time radial vibration, axial displacement and Keyphasor measurement, threshold alarming and safety interlock protection. Each finished unit passes linearity calibration, insulation inspection and high-low temperature cycling aging test before shipment to maintain stable conversion accuracy under harsh field environments with high temperature, lubricant oil mist and complex industrial electromagnetic interference.
Description
Bently Nevada 24765-02-01 Proximitor Sensor Preamplifier Specification
1. Product Overview
24765-02-01 is factory pre-calibrated original proximitor preamplifier unit for Bently Nevada 3300XL eddy current proximity transducer system, widely used on steam turbines, turbo-generators, centrifugal compressors and large industrial blowers across power, petrochemical and metallurgical industries. As the core signal conditioning component between field proximity probe and rack vibration monitor module, this proximitor receives small alternating signals from the eddy current probe, executes high-frequency signal conditioning, linear conversion and impedance matching, and outputs proportional DC analog voltage corresponding to clearance changes between probe tip and metallic target. Processed signals are transmitted to 3300 or 3500 series rack monitor cards for real-time radial vibration, axial displacement and Keyphasor measurement, threshold alarming and safety interlock protection. Each finished unit passes linearity calibration, insulation inspection and high-low temperature cycling aging test before shipment to maintain stable conversion accuracy under harsh field environments with high temperature, lubricant oil mist and complex industrial electromagnetic interference.
2. Part Number Definition Breakdown
Each dash-divided segment of 24765-02-01 represents fixed factory preset configuration parameters. 24765 is base series code for standard standalone proximitor preamplifier matching 3300XL proximity probe assemblies; middle code 02 defines preset calibrated sensitivity, internal circuit layout and applicable probe specification range; trailing code 01 stands for hardware revision, terminal pin assignment and outer housing structure standard. Any alternative proximitor with different suffix digits carries mismatched factory calibration data and cannot be directly interchanged without recalibration, which will cause serious measuring deviation of the whole transducer loop.
3. Core Functional Characteristics
Based on high-frequency oscillation eddy current signal processing circuit, the proximitor provides stable high-frequency excitation source to drive paired proximity probe, converts gap-varying coil impedance into continuous linear analog voltage output. Built-in internal filtering circuit suppresses high-frequency clutter and power-frequency electromagnetic interference from nearby high-voltage cables and variable-frequency equipment to avoid signal distortion during long-distance cable transmission. Compact sealed metal housing delivers excellent oil-proof, dust-proof and anti-vibration performance for installation inside equipment junction boxes or control cabinets near bearing housings. When assembled with factory-matched probe and calibrated extension cable, the complete measurement system maintains fixed linear relationship between output voltage and physical clearance, enabling backend monitor modules to configure pre-alarm and trip limits for over-vibration protection. Basic internal fault detection can reflect open or short circuit of field probe loop via abnormal output voltage variation for easy on-site troubleshooting.
4. Electrical and Metrological Specifications
The proximitor requires regulated negative DC input power ranging from -17.5VDC to -26VDC supplied by rack monitor modules or dedicated system power source per Bently standard specification. It follows factory locked calibrated sensitivity defined by part code to match corresponding 3300XL proximity probe, featuring stable linear output within specified effective measuring range. Internal isolation design restricts leakage current and temperature drift to guarantee consistent conversion precision under normal operating temperature fluctuation. Standard terminal block layout supports convenient field wiring connections for probe cable, power supply and signal output wiring; cutting or replacing unmatched extension cable will invalidate original factory calibration parameters of the entire measuring loop.
5. Environmental Working Parameters
Continuous permissible operating ambient temperature of the proximitor ranges from -40°C up to +121°C to adapt high-temperature installation close to hot-running machinery bearing compartments. Spare storage temperature is controlled between -55°C and +85°C under dry non-condensing ambient condition, applicable working relative humidity spans 5%RH ~ 95%RH with condensation inside metal housing strictly forbidden to prevent internal circuit corrosion and short-circuit faults. The unit can withstand routine industrial vibration of 10Hz~2kHz generated by operating rotating equipment; long-term continuous exposure to heavy corrosive gas and persistent hot steam is prohibited to extend internal component service life. For installation above 1000 meters altitude, shorten regular inspection cycle appropriately.
6. Installation and Routine Maintenance Guidance
The proximitor metal casing is equipped with mounting holes for rigid bolt fixation on flat panel or junction box base near field probe layout. During field wiring, separate signal cables away from high-power AC wiring to minimize cross interference and tighten all terminal screws fully to avoid loose contact-induced intermittent signal fluctuation. In periodic maintenance work, regularly check housing integrity, wiring tightness and surrounding environment for oil accumulation or overheating risks. When on-site replacement is needed due to unit damage, only spare part with identical full part number 24765-02-01 is allowed for direct swap. All replacement preamplifiers complete full factory calibration and temperature aging test before outgoing delivery to ensure full interchangeability for equipment overhaul and system maintenance.
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