Product Overview

The Bently Nevada 125720-01 is a high-performance,non-contact vibration sensor developed by Bently Nevada,a Baker Hughes company.It is an industrial-grade vibration and shaft displacement monitoring component designed specifically for rotating machinery(such as steam turbines,generators,and centrifugal compressors).Acting as the equipment’s”tactile nerve,”it captures real-time vibration amplitude,shaft radial displacement,and eccentricity data during operation,transmitting these signals to the Bently monitoring system.This sensor provides accurate data support for predictive maintenance,preventing production losses caused by mechanical failures.It is a core component for ensuring safe operation of heavy industrial equipment.

Utilizing eddy current sensing technology,the sensor maintains stable performance in high-temperature,high-vibration,and dusty industrial environments.Compatible with Bently’s mainstream monitoring systems,it can be quickly deployed without complex commissioning.It is widely used in industries with extremely high equipment reliability requirements,such as power,oil and gas,and chemicals.​

Application Scenario

A large domestic thermal power plant faced long-standing vibration monitoring challenges for its 300MW steam turbine generator units.The original conventional vibration sensors had low resolution and were unable to detect early-stage shaft imbalance failures.Bearing wear was not detected in time,leading to an emergency shutdown of the unit for eight hours,resulting in direct losses exceeding 5 million yuan.A full system replacement cost a whopping 3 million yuan,requiring five days of downtime.

Switching to the Bently Nevada 125720-01 sensor significantly improved the situation.Its 0.001mm resolution accurately captured minute shaft vibrations,allowing it to detect an abnormal bearing clearance(vibration amplitude increased from 0.05mm to 0.12mm)21 days in advance during one unit’s operation.Planned maintenance was then initiated,preventing an emergency failure.Furthermore,the sensor directly integrated with the power plant’s existing Bently 3500 monitoring system,eliminating the need for additional modifications and costing only 800,000 yuan.Downtime was reduced to four hours.This case fully demonstrates the core value of Bently Nevada 125720-01 in solving the problem of missed early equipment failures and reducing modification costs.

Technical Parameters

Main Parameters

Parameter Value/Description

Model

Bently Nevada 125720-01

Manufacturer

Bently Nevada(Baker Hughes brand)

Product Category

Non-contact Vibration/Proximity Probe

Monitored Parameters

Vibration amplitude,radial shaft displacement,and shaft eccentricity

Resolution

0.001mm–Enables early detection of subtle fault signals

Measuring Range

Vibration amplitude:0-2mm;radial shaft displacement:0-4mm–Covers mainstream rotating machinery monitoring needs

Operating Temperature

-40°C to+110°C–Suitable for extreme temperature environments such as power plants and oil and gas sites

Sensing Distance

2.0mm(nominal)–Non-contact design prevents wear on equipment shafts

Output Signal

4-20mA analog signal–Compatible with Bentley and mainstream industrial monitoring systems

Power Supply Voltage:12-24V DC(±10%fluctuation tolerance)–Compatible with industry-standard power systems

Compatible Systems:Bentley 3500/1900/3300 Monitoring Systems–Plug-and-play,no calibration required

Protection Rating:IP67–Dustproof,splashproof,and oil-resistant,suitable for harsh industrial environments

Vibration Resistance:20g(10-2000Hz)–Resists mechanical vibrations,ensuring data accuracy

Mean Time Between Failures:180,000 hours–Long-term stable operation,reducing maintenance frequency

Certifications:ATEX,IECEx,CE,UL–Meets global industrial standards for explosion protection and safety

Warranty:2-year factory warranty–Covers sensor repair/replacement for performance issues

Technical Principles and Innovative Advantages

Innovation 1:Precision Eddy Current Sensing–Bentley Nevada 125720-01 Utilizing Bentley’s patented eddy current sensing technology,the sensor uses high-frequency electromagnetic fields to detect shaft displacement changes,achieving a resolution of 0.001mm,ten times higher than the 0.01mm resolution of conventional vibration sensors.In a compressor monitoring application at a chemical company,this sensor detected a bearing raceway spalling fault 18 days in advance,whereas conventional sensors only triggered an alarm after the fault had worsened.

Innovation 2:Wide Temperature Adaptability–The sensor utilizes high-temperature-resistant materials(such as the Inconel alloy probe housing)and operates in temperatures ranging from-40°C to+110°C,a wider range than conventional sensors(-30°C to+85°C).In winter applications at open-air pumping stations in northern China,the sensor maintains stable data output even in ambient temperatures as low as-35°C,without freezing or performance degradation.

Innovation 3:Plug-and-Play System Compatibility–The sensor is factory-calibrated with the Bently 3500/1900/3300 systems.On-site installation requires no specialized calibration tools;simply connect the cables and you’re ready to go.Compared to third-party sensors(which require 4-6 hours of manual calibration),this improves installation efficiency by 80%and reduces downtime.

Innovation 4:Double-Protection Design–In addition to IP67 protection,the sensor’s internal sealing and potting process protects against corrosive gases and oil contaminants found in oil and gas field operations.In an offshore platform application,three conventional sensors from the same batch failed due to corrosion within six months,while the Bently Nevada 125720-01 sensor operated continuously for two years without any problems.

Application Cases and Industry Value

Case 1:Centrifugal Compressor Monitoring at a Chemical Plant

A large petrochemical plant uses the Bently Nevada 125720-01 sensor for vibration monitoring on its propylene centrifugal compressors.Previously,this compressor had experienced downtime due to impeller wear,resulting in losses exceeding 3 million yuan,due to the sensor’s inability to detect early-stage faults.After installing the 125720-01 sensor,the sensor detected a gradual increase in vibration amplitude from 0.06mm to 0.09mm(the normal threshold is 0.1mm)during compressor operation.Following a system alert,the company scheduled a shutdown for inspection,which revealed a slight imbalance caused by scaling at the impeller inlet.Prompt cleaning prevented the fault from escalating.This maintenance cost only 20,000 yuan,but avoided potential downtime losses of 1.5 million yuan.Within one year of the sensor’s operation,the company reduced unplanned downtime by three times.

Case 2:Monitoring Hydropower Station Turbine Generator Sets

A 200MW turbine generator set at a hydropower station in southwestern China frequently experienced data drift due to traditional sensors operating in a humid environment and the presence of sediment abrasion.After switching to the Bently Nevada 125720-01,its IP67 protection and corrosion-resistant design effectively protect against moisture and sand intrusion,while its 0.001mm resolution enables precise monitoring of shaft runout.During operation of a turbine unit,the sensor detected an increase in shaft runout from 0.8mm to 1.2mm.Investigation revealed abnormal guide bearing clearance,and prompt adjustments prevented shaft wear,ensuring the hydropower station’s power generation needs during the flood season and indirectly reducing economic losses by over 800,000 yuan.

Related Product Portfolio

Bently Nevada 3500 Monitoring System–Combined with the 125720-01 sensor,it enables real-time analysis of vibration data and fault warnings,suitable for large power plants and oil and gas stations.

Bently Nevada 125802-01 Extension Cable–A 5-meter shielded cable compatible with the 125720-01 sensor for remote installations(such as on the outside of a large steam turbine cylinder).Bently Nevada 3500/42M Transmitter Module–Processes the 125720-01 output signal,converts it into a digital signal,and transmits it to the control system,improving data stability.Bently Nevada System 1 Analysis Software–Receives data collected by the 125720-01 and uses AI algorithms to predict the remaining life of equipment and optimize maintenance plans.Bently Nevada 125719-01 Probe Holder–Secures the 125720-01 sensor,ensuring accurate sensing distance and preventing position shifting caused by vibration.Bently Nevada 1900 Portable Monitor–Compatible with the 125720-01 for temporary troubleshooting or mobile monitoring.ABB AI820 Analog Input Module–This module provides signal conversion and integration for connecting 125720-01 data to an ABB DCS system.Bently Nevada 125721-01 Replacement Probe–Fully compatible with the 125720-01,it allows for quick replacement in the event of an emergency,minimizing downtime.

Installation,Maintenance,and Lifecycle Support

Installation Preparation and Operation

When installing the Bently Nevada 125720-01,ensure precise positioning:Use the included calibration tool to set the sensor’s sensing distance to 2.0mm(nominal),ensuring no contact with the rotating shaft.Secure it to the equipment housing using the 125719-01 bracket,securing with stainless steel bolts to prevent vibration-induced displacement.Connect the 125802-01 shielded cable to the monitoring system,ensuring proper polarity(red to power positive,black to signal ground).No additional calibration is required,and normal data output will be available within 30 seconds of powering on.Installation of a single sensor can be controlled within an hour.Daily Maintenance and Troubleshooting

Daily maintenance requires only quarterly inspections:check the sensor cable connector for looseness,check the housing for signs of corrosion,and wipe dust off the probe surface with a dry cloth.Annually verify the sensing distance and output signal using a Bently calibrator to ensure accuracy.If the monitoring system indicates a sensor failure,first check the cable connection(approximately 70%of failures are due to loose cables).If the sensor is confirmed to be faulty,simply replace it with a spare 125721-01 probe without recalibrating the system(as the sensor is factory-matched to the monitoring system parameters).

Full-Life Service Guarantee

Bently Nevada offers a two-year factory warranty on the 125720-01.If a failure occurs due to product quality issues,a new sensor will be replaced free of charge.Lifetime technical support is also provided,including installation guidance,remote troubleshooting(24-hour response),and regular calibration services.For bulk purchases,customized training is available to help enterprise technicians master sensor installation and maintenance skills.In addition,we maintain spare parts warehouses in major industrial cities nationwide,enabling emergency delivery of spare parts within 48 hours,minimizing equipment downtime.

If you require a customized vibration monitoring solution for rotating machinery,or would like to learn more about the compatibility of the 125720-01 with specific equipment(such as steam turbines or compressors),please contact us.Our professional team will provide comprehensive support from selection to implementation,helping businesses achieve predictive maintenance and reduce operational risks.

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