Bently Nevada 24765-01-00 Proximitor Preamplifier Product Specification
24765-01-00 is factory pre-calibrated standalone proximitor preamplifier belonging to Bently Nevada 3300XL eddy current proximity transducer system. It serves as the core signal conditioning unit linking field-installed proximity probes and rack-mounted vibration monitor modules, widely applied for condition monitoring of steam turbines, turbo-generators, centrifugal compressors and large industrial blowers in power, petrochemical and metallurgical industries. This proximitor generates high-frequency excitation for paired eddy current probes, converts impedance changes caused by gap variation between probe tip and metallic target into stable linear DC analog voltage. Processed output signals are transmitted to 3300 or 3500 series rack monitor cards to accomplish real-time measurement of rotor radial vibration, thrust axial displacement and Keyphasor rotational pickup, as well as over-limit pre-alarm and safety shutdown interlock protection. Every finished unit passes linearity calibration, insulation resistance inspection and alternating high-low temperature cycling aging test before factory delivery to secure consistent measuring accuracy under harsh field environments with high temperature, lubricating oil mist and complex electromagnetic interference near bearing housings and local junction boxes.
Description
Bently Nevada 24765-01-00 Proximitor Preamplifier Product Specification
1. Product Overview
24765-01-00 is factory pre-calibrated standalone proximitor preamplifier belonging to Bently Nevada 3300XL eddy current proximity transducer system. It serves as the core signal conditioning unit linking field-installed proximity probes and rack-mounted vibration monitor modules, widely applied for condition monitoring of steam turbines, turbo-generators, centrifugal compressors and large industrial blowers in power, petrochemical and metallurgical industries. This proximitor generates high-frequency excitation for paired eddy current probes, converts impedance changes caused by gap variation between probe tip and metallic target into stable linear DC analog voltage. Processed output signals are transmitted to 3300 or 3500 series rack monitor cards to accomplish real-time measurement of rotor radial vibration, thrust axial displacement and Keyphasor rotational pickup, as well as over-limit pre-alarm and safety shutdown interlock protection. Every finished unit passes linearity calibration, insulation resistance inspection and alternating high-low temperature cycling aging test before factory delivery to secure consistent measuring accuracy under harsh field environments with high temperature, lubricating oil mist and complex electromagnetic interference near bearing housings and local junction boxes.
2. Part Number Definition Breakdown
Each segmented code of 24765-01-00 corresponds to fixed factory preset configuration parameters. 24765 is the base series code for standard standalone proximitor compatible with 3300XL proximity probe assemblies; the middle segment 01 defines factory-locked calibrated sensitivity, internal circuit layout and matching probe specification scope; the trailing segment 00 specifies hardware revision version, terminal pin definition and metal enclosure structural standard. Any proximitor with different suffix coding holds inconsistent factory calibration parameters and cannot be directly interchanged on-site without professional recalibration, which will introduce severe measurement error across the entire transducer loop.
3. Core Functional Characteristics
Built upon high-frequency oscillation eddy current signal processing circuit, the proximitor delivers stable high-frequency drive source to connected proximity probe and linearly transforms physical clearance variation into proportional output voltage. Multi-stage built-in filtering circuit suppresses power frequency interference and high-frequency clutter induced by adjacent high-voltage cables and variable-frequency drive equipment to reduce signal distortion during long-distance field cable transmission. Fully sealed metal housing features outstanding oil resistance, dustproof and anti-vibration performance, enabling reliable installation inside compact local junction boxes close to high-temperature bearing compartments of rotating equipment. When assembled with factory-certified proximity probe and matched calibrated extension cable, the complete measurement system maintains fixed linearity characteristic, supporting backend monitor modules to configure pre-alarm and critical trip thresholds for machinery over-vibration protection. Abnormal open-circuit or short-circuit faults on field probe wiring can be quickly identified via abnormal output voltage shift for convenient on-site troubleshooting.
4. Electrical and Metrological Specifications
The proximitor requires regulated negative DC input power ranging from -17.5VDC to -26VDC, supplied by matching rack monitor modules or dedicated system power supply complying with Bently standard design. Sensitivity and effective linear measuring range are strictly fixed via original factory calibration defined by part coding to fit designated 3300XL proximity probes. Premium internal insulating materials effectively minimize temperature drift and leakage current to sustain stable signal conversion precision under normal ambient temperature fluctuation. Standard screw terminal block facilitates on-site wiring of power supply, probe input cable and analog signal output cable; random cutting or replacement with non-calibrated unmatched cables will invalidate factory calibration data of the whole measurement circuit.
5. Environmental Working Parameters
Continuous allowable operating ambient temperature of the proximitor ranges from -40°C up to +121°C, suitable for mounting near high-temperature equipment bearing housings. Spare storage temperature is maintained between -55°C and +85°C under dry non-condensing storage condition; applicable working relative humidity covers 5%RH~95%RH, and internal condensation inside metal casing is strictly prohibited to avoid circuit corrosion and short-circuit faults. The device can withstand regular industrial running vibration of 10Hz~2kHz generated by nearby rotating machinery. Long-term continuous exposure to heavily corrosive gas and persistent hot steam immersion is forbidden to extend service life of internal electronic components. For installation above 1000 meters altitude, shorten routine inspection cycle appropriately.
6. Installation and Routine Maintenance Guidance
Mounting holes are reserved on the metal enclosure for rigid bolt fixing onto flat junction box base or customized equipment brackets. During field wiring construction, route signal cables separately from high-current AC power cables to avoid cross electromagnetic interference and fully tighten all terminal screws to eliminate intermittent signal fluctuation from loose contact. In periodic maintenance activities, regularly inspect enclosure integrity, terminal fastening tightness and surrounding oil accumulation status around installation location. When on-site replacement becomes necessary due to unit failure, only spare part with identical full part number 24765-01-00 is allowed for direct swap. All replacement preamplifiers complete full factory performance testing and high-low temperature aging screening prior to shipment to guarantee full interchangeability during equipment overhaul and system maintenance.
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