BENTLY NEVADA 3701/55 ADAPT Condition Monitor

Preamplifier circuit: Performs low-noise amplification (adjustable gain, 1~1000x) on weak sensor signals (e.g., mV-level signals output by eddy current sensors) to suppress background noise (signal-to-noise ratio ≥ 80dB);

Filter circuit: Built-in programmable low-pass/high-pass filters (adjustable cutoff frequency 0.1Hz~10kHz) to filter out on-site interference signals (e.g., power grid harmonics, mechanical high-frequency noise);

Temperature compensation circuit: Aiming at the characteristic of eddy current sensors being affected by ambient temperature, a built-in PT100 temperature acquisition channel is provided to real-time compensate for temperature drift (compensation range -40~70℃, ensuring displacement measurement accuracy).

Analog-to-Digital Converter (ADC): 16-bit resolution, maximum sampling rate 100kHz (single channel), supporting synchronous sampling (multi-channel sampling time difference ≤ 1μs) to ensure time consistency of multi-parameter (e.g., vibration, displacement, rotational speed) acquisition;

Buffer unit: Built-in 512KB SRAM buffer for temporarily storing real-time acquired data to avoid data loss (supports data retention for 10s after power failure to prevent critical data loss caused by sudden power outage).

Signal input terminals: 4 groups of differential input terminals (each group corresponding to 1 channel of sensor signal, e.g., vibration + Keyphasor, displacement + temperature), supporting BNC connectors or screw crimp terminals (compatible with different sensor cables);

Sensor power supply terminals: 2 groups of isolated DC 15V/24V power output (providing independent power supply for eddy current sensors and acceleration sensors to avoid interference with the module’s main power supply);

Keyphasor signal interface: 1 group of dedicated Keyphasor input terminals (supporting 0~10V pulse signals or sine signals for rotational speed calculation and phase synchronization).

Industrial Ethernet interfaces: 2 RJ45 ports (supporting Ethernet/IP and Modbus TCP protocols) for communication with upper computers (e.g., condition monitoring software System 1) or PLCs, with adaptive data transmission rate of 10/100Mbps;

Serial communication interface: 1 RS-485 port (supporting Modbus RTU protocol) for networking with local display terminals or other monitoring modules (supporting "daisy-chain" topology for multi-modules, with a maximum of 32 modules in series);

Alarm output interfaces: 4 dry contact output terminals (normally closed/normally open optional, corresponding to four states: "Warning", "Danger", "Fault", "Normal") for driving on-site alarm lights or relays.

Vibration monitoring: Supports radial vibration (bearing housing vibration, shaft vibration) and axial vibration (coupling vibration), and can measure characteristic values such as peak value, peak-to-peak value, RMS (Root Mean Square), crest factor, and kurtosis (for judging faults such as bearing wear and rotor unbalance);

Position monitoring: Shaft displacement (e.g., axial displacement of steam turbine rotor, judging whether static and dynamic components are rubbing) and shaft eccentricity (rotor eccentricity, monitoring rotor bending status);

Rotational speed monitoring: Real-time calculation of rotational speed (RPM), rotational speed fluctuation (judging whether the rotor is unstable), and order (vibration frequency component synchronized with rotational speed, for diagnosing faults such as rotor unbalance and misalignment);

Temperature monitoring: Bearing temperature and stator temperature (judging whether the lubrication system is normal and preventing bearing burnout due to overheating).

Continuous acquisition mode: 24/7 uninterrupted data acquisition (adjustable sampling rate 10~100kHz) for real-time monitoring and fault alarm;

Intermittent acquisition mode: Data acquisition at set intervals (1min~1h adjustable) for long-term trend analysis (e.g., tracking equipment aging trends);

Event-triggered acquisition mode: When the monitored value exceeds the preset threshold (e.g., excessive vibration, abnormal rotational speed), high-speed acquisition is automatically activated (sampling rate increased to 100kHz), and data before and after the fault occurrence is recorded (adjustable pre-trigger time 1~10s), providing complete data support for fault diagnosis.

Rotor unbalance: Judging whether the rotor has unbalance (e.g., blade wear, rotor fouling) by analyzing the amplitude change of the 1st-order vibration component (consistent with rotational speed frequency);

Misalignment: Analyzing the 2nd-order vibration component (twice the rotational speed frequency) to diagnose coupling or shafting misalignment (parallel misalignment, angular misalignment);

Bearing faults: Identifying wear of rolling bearing outer rings, inner rings, and rolling elements through high-frequency vibration analysis (above 10kHz) or changes in crest factor and kurtosis;

Rubbing faults: Monitoring sudden changes in axial displacement and vibration burr signals to warn of rotor-stator rubbing (e.g., steam turbine gland rubbing);

Oil whirl/oscillation: Analyzing the vibration component of 0.4~0.5 times the rotational speed frequency to diagnose oil film instability of plain bearings.

Alarm levels: Supports three-level alarm settings — "Warning" (mild overrun, requiring attention), "Danger" (severe overrun, requiring shutdown inspection), and "Emergency" (sudden fault, requiring immediate shutdown);

Alarm triggering methods: Can be based on "absolute value triggering" (e.g., vibration peak-to-peak value > 50μm triggers warning) or "trend triggering" (e.g., vibration amplitude increase > 20% within 1 hour triggers warning);

Alarm output: When an alarm is triggered, it synchronously activates LED indicators (corresponding color lights up), dry contact output (driving external alarm equipment), and communication messages (sending alarm information to the upper computer), ensuring on-site and remote personnel are informed of the fault simultaneously.

Classified data storage: Data is stored in categories as "real-time data" (second-level sampling), "trend data" (minute-level sampling), and "event data" (fault-triggered high-speed sampling), supporting quick retrieval by time and parameter type;

Data export: Supports exporting historical data to CSV or MATLAB format via the Ethernet interface for offline analysis (e.g., comparing with equipment maintenance records to optimize maintenance cycles).

Remote access: Supports remote access to the module via BENTLY System 1 condition monitoring software (or third-party SCADA systems) to real-time view monitoring data, spectrograms, and trend curves;

Remote configuration: Module parameters (e.g., alarm thresholds, sampling rates, sensor calibration data) can be modified remotely without on-site operations (reducing the number of times personnel enter hazardous areas such as nuclear power steam turbine plants);

Firmware upgrade: Supports remote firmware upgrade of the module via the Ethernet interface to achieve function iteration (e.g., adding new fault diagnosis algorithms) without disassembling the module.

Power supply redundancy: Supports dual-channel DC 24V input (main/backup power supply, automatically switching to the other channel when one channel is powered off, with switching time <100ms);

Communication redundancy: The Ethernet interface supports redundant configuration (dual network cards, automatically switching to the other channel when one communication channel fails) to ensure uninterrupted data transmission;

Module redundancy: Supports "1+1" redundancy configuration of multiple modules (the standby module automatically takes over the monitoring task when the main module fails), suitable for critical equipment (e.g., nuclear power main pumps, large compressors).

Real-time monitoring of steam turbine rotor axial displacement (preventing unit damage caused by rubbing between static and dynamic components);

Early warning of generator bearing temperature rise (avoiding shutdown accidents caused by bearing burnout);

Predicting feedwater pump impeller wear through trend analysis (arranging maintenance in advance to avoid unplanned shutdowns).

Diagnosing compressor shafting misalignment (avoiding premature bearing wear caused by misalignment and extending service life);

Monitoring oil transfer pump vibration (warning of impeller cavitation or blockage to ensure stable crude oil transportation);

Recording vibration data during unit startup and shutdown (analyzing impact loads during startup and shutdown to optimize startup/shutdown curves).

Monitoring vibration of main drive motors of rolling mills (warning of gearbox wear to avoid steel plate scrapping caused by equipment faults during rolling);

Analyzing rotational speed fluctuations of blast furnace blowers (ensuring stable air pressure to avoid blast furnace wind cutoff affecting smelting).