Description

Bently Nevada 3500/25 125792-01 is an enhanced Keyphasor module in the Bently Nevada 3500 series mechanical protection system.As a half height,two channel module,it plays a crucial role in the entire mechanical monitoring and protection system,mainly used to provide high-precision Keyphasor for monitoring modules in the 3500 rack®Signal.This module is capable of receiving input signals from proximity probes or magnetic pickups and efficiently converting them into digital Keyphasor signals.

These Keyphasor signals accurately indicate the moment when the Keyphasor markings on the axis align with the sensor,typically as pulse signals per revolution or multiple revolutions.Through these critical timed measurements,the Bently Nevada 3500/25 module enables other modules in the 3500 monitoring system and external diagnostic equipment to accurately measure rotor speed,as well as vector parameters such as 1X vibration amplitude and phase,which are crucial for health monitoring and fault diagnosis of rotating machinery.The Bently Nevada 3500/25 module of model 125792-01 emphasizes its enhanced signal processing capabilities and full backward compatibility with traditional Keyphasor modules,ensuring seamless integration and upgrades in existing systems.

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technical specifications

Product model:3500/25

Manufacturer:Bently Nevada

Product Type:Enhanced Keyphasor Module

Part number:125792-01

Number of channels:2 channels

Module type:Half height module

Input signal type:Eddy current displacement sensors(Proximity Probes)or magnetic pickups(Magnetic Pickups)

Input signal range(non isolated I/O):+0.8 V to-21.0 V

Input signal range(isolated I/O):+5V to-11V

Frequency/speed range:1 to 1200000 CPM(0.017 to 20 kHz)

Output signal:2-channel buffered Keyphasor output(front panel coaxial connector,rear panel Euro Style connection)

Typical power consumption:3.2 watts

Operating temperature:-30°C to+65°C(non internal barrier version)

Storage temperature:-40°C to+85°C

Humidity:95%(non condensing)

Physical dimensions(height x width x depth)119.9 mm x 24.4 mm x 256.5 mm(main module)

Weight(main module):0.34 kg:(0.76 lbs)

Installation method:3500 rack slot installation(occupying a half height slot)

Approval certification:cNRTLus(Class 1,Div 2),ATEX/IECEx/CSA(Class 1 Zone 2)optional

Main features and advantages

The Bently Nevada 3500/25 module demonstrates outstanding performance and unique advantages in precise monitoring of rotating machinery

High precision Keyphasor signal generation:The core advantage of the Bently Nevada 3500/25 module is its ability to accurately extract and generate Keyphasor signals from raw sensor signals.These timed pulses of”once per rotation”or”multiple times per rotation”are the basis for synchronous data acquisition and advanced diagnostic analysis(such as vibration spectrum analysis,axis trajectory diagram,waterfall diagram,etc.),ensuring accurate understanding and warning of the machine’s operating status.

Enhanced signal processing capability:As an enhanced module,the 3500/25 provides more powerful Keyphasor signal processing capabilities than its predecessor.It can handle a wider range of input frequencies and generate one-time event signals from multiple event inputs per revolution,greatly improving the adaptability and measurement accuracy of the module in various complex rotating machinery applications.

High compatibility and easy integration:The 125792-01 module maintains full backward compatibility with existing Bently Nevada 3500 systems and Legacy Keyphasor modules in its design.This means that users can seamlessly upgrade or replace old modules without the need for large-scale system upgrades,saving time and costs and protecting existing investments.

Support redundant configuration:In critical applications requiring the highest reliability,the Bently Nevada 3500/25 module supports dual module parallel operation and provides primary/standby Keyphasor signal output to achieve the third mock examination redundancy(TMR)applications.This design ensures that even if a single module fails,the Keyphasor signal can be continuously provided to the system,thereby maximizing system availability and protection capabilities.

Flexible I/O module options:Bently Nevada 3500/25 offers a variety of I/O module options,including internal terminals,external terminals,and isolated I/O modules.Especially the isolated I/O module provides electrical isolation between Keyphasor signals and other parallel connected devices(such as control systems),effectively avoiding ground loops and signal interference,and improving the overall noise resistance and safety of the system.

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application area

The Bently Nevada 3500/25 enhanced Keyphasor module plays an indispensable role in monitoring numerous industrial fields and critical mechanical equipment,mainly used in situations where precise synchronous measurement and condition monitoring of rotating machinery are required.

In the power production industry,especially in steam turbines,gas turbines,and hydro generators,the 3500/25 is used to provide accurate speed and phase references,supporting monitoring of key parameters such as shaft vibration,axial displacement,and differential expansion.It ensures the smooth operation of the generator set and provides necessary data for preventive maintenance and fault diagnosis.

In the oil and gas industry,including refineries,natural gas compression stations,LNG plants,and offshore platforms,this module is widely used to monitor large compressors(such as centrifugal,axial,reciprocating compressors),pumps,fans,and blowers.Bently Nevada 3500/25 provides accurate speed and phase information to help operators identify potential faults such as imbalance,misalignment,and shaft cracks,thereby avoiding catastrophic equipment damage and production interruptions.

In the chemical and petrochemical industries,125792-01 is integrated into the protection systems of various high-speed rotating machinery,such as reactor agitators,separators,reactor circulation pumps,etc.,to ensure the continuity and safety of the production process.

In addition,the Bently Nevada 3500/25 is also used for condition monitoring of large motors,reducers,and mills in heavy industries such as pulp and paper,steel,and mining,providing critical data support for predictive maintenance and asset management of equipment.Its precise timing capability makes advanced vibration analysis possible,significantly improving equipment reliability,reducing operational risks,and maintenance costs.

Related products

Bently Nevada 3500/25,as an important component of the 3500 series system,often works in conjunction with other modules to build a complete mechanical protection and condition monitoring solution:

Bently Nevada 3500/05 rack:serves as the physical carrier and backplane communication platform for all 3500 series modules.

Bently Nevada 3500/15 power module:Provides stable and redundant power to the entire 3500 rack and all modules.

Bently Nevada 3500/20 Rack Interface Module(RIM)or 3500/22M Transient Data Interface(TDI):serves as the primary interface between the 3500 rack and configuration software,displays,and data acquisition systems.

Bently Nevada 3500/40M Proximitor®Monitor:used for radial vibration and axial displacement monitoring,combined with Keyphasor signal provided by 3500/25 for synchronous analysis.

Bently Nevada 3500/42M Combination Vibration Monitor:capable of receiving inputs from eddy current,velocity,and acceleration sensors,and utilizing 3500/25 signals for phase and vibration analysis.

Bently Nevada 3500/32 relay module:receives alarm signals from monitoring modules and drives relay outputs to perform shutdown or alarm actions.

Bently Nevada System 1™Software:Bently Nevada’s comprehensive data acquisition,diagnosis,and management software platform is used to store,analyze,and present all data collected by 3500/25 and other monitoring modules.

Bently Nevada 3300 XL series sensors:including Proximitors®Probe,extension cable,and Proximitor®Sensors,as front-end input devices for 3500/25.

Installation and maintenance

Preparation before installation:Before installing the Bently Nevada 3500/25 module,it is necessary to strictly follow all installation manuals and safety instructions provided by Bently Nevada.Ensure that the 3500 rack is completely powered off and locked before any installation operation to prevent accidental start-up or electric shock.The module and its accompanying I/O module should be checked for any physical damage,and its model(especially 125792-01)should be confirmed to be consistent with the system design and compatibility requirements.Insert the 3500/25 main module into the half height slot of the 3500 rack,ensuring that it is fully inserted and securely fastened to the backplane connector.Subsequently,connect the I/O module corresponding to the main module at the rear of the rack or at the corresponding I/O module installation position.According to the wiring diagram,correctly connect the signal wires from the eddy current displacement sensor or magnetic pickup to the input terminals of the I/O module,and ensure that all shielding layers and grounding connections are correct to avoid signal interference.

Maintenance recommendation:To ensure long-term reliable operation and optimal performance of the Bently Nevada 3500/25 module and its associated 3500 system,it is recommended to develop and implement regular maintenance plans.Regularly visually inspect the module,remove accumulated dust and dirt,especially at the cooling vents,to ensure good heat dissipation.Check all wiring terminals for firmness,no signs of looseness or corrosion.Utilizing Bently Nevada’s System 1™Regularly check the diagnostic status,Keyphasor signal quality,and system alarm logs of the 3500/25 module software to promptly identify and resolve potential issues.Pay attention to the LED indicator lights on the front panel of the module,which usually display the operating status and fault information of the module.When replacing the 125792-01 module,ensure to use Bently Nevada original spare parts and follow the replacement steps provided by the manufacturer,including system power failure,module unplugging and reconfiguring.Any advanced maintenance or troubleshooting work should be performed by Bently Nevada trained engineers to ensure proper and safe operation.

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Product Guarantee

Bently Nevada provides comprehensive product assurance for all of its products,including the 3500/25 125792-01 enhanced Keyphasor module.