BENTLY 3500/20 125744-02

Description

Detailed parameter table

BENTLY 3500/20 125744-02

Product introduction

The 3500/20 125744-02 from Bently Nevada is a precision position monitoring module designed for the 3500 Machinery Protection System, specializing in continuous measurement of critical machinery position parameters. This 2-slot rack-mounted module serves as the primary position sensing component in industrial monitoring systems, providing essential data on shaft position, thrust bearing wear, and casing expansion through its four configurable channels.

Unlike general-purpose measurement devices, 3500/20 125744-02 is engineered specifically for machinery protection applications, supporting proximity probes and LVDTs to monitor axial and radial positions in rotating equipment. It seamlessly integrates with vibration monitors like the 3500/40M 140734-01 to provide a comprehensive view of machinery health and with display modules such as 3500/60 163179-01 for real-time visualization of position data.

In machinery protection ecosystems, 3500/20 125744-02 plays a critical role in detecting early signs of axial movement, bearing wear, and misalignment that could lead to catastrophic failures. By continuously monitoring position parameters and generating timely alarms, it enables both protective actions and predictive maintenance strategies, enhancing equipment reliability across power generation, oil and gas, and manufacturing industries.

Core advantages and technical highlights

Dual sensor compatibility: 3500/20 125744-02 supports both proximity probes and LVDTs across its four channels, providing flexibility to monitor different position parameters with optimal sensor technology. Proximity probes are ideal for shaft position measurement, while LVDTs excel at casing expansion and differential position monitoring, allowing comprehensive coverage of critical machinery position parameters without requiring specialized modules.

High-precision measurement: The module delivers ±0.1% full-scale accuracy, ensuring reliable detection of subtle position changes that indicate early machinery degradation. This precision is critical for monitoring thrust bearing wear in turbines and compressors, where even small axial movements can signal impending failure. The 100 Hz update rate ensures that rapid position changes are captured and processed in real time.

Integrated alarm functionality: 3500/20 125744-02 features independently configurable dual alarm levels per channel with adjustable time delays, ensuring reliable detection of abnormal position conditions while preventing nuisance alarms. Alarm signals are coordinated with 3500/40M 140734-01 vibration alarms through the 3500 backplane, providing a holistic warning system that correlates position and vibration anomalies for more accurate fault diagnosis.

System-wide synchronization: Designed for the 3500 architecture, the module maintains precise timing synchronization with other system components, ensuring that position data correlates accurately with vibration measurements from 3500/40M 140734-01 and temperature readings from other modules. This synchronization enables engineers to analyze how position changes relate to vibration patterns, supporting more accurate root cause analysis of machinery issues.

Typical application scenarios

In steam turbine power plants, 3500/20 125744-02 modules monitor critical position parameters including rotor axial thrust, shaft radial position, and casing expansion. The module’s channels are configured with proximity probes to track shaft movement and LVDTs to measure casing expansion, providing data that is displayed alongside vibration measurements from 3500/40M 140734-01 on 3500/60 163179-01 screens. This integration allows operators to detect dangerous combinations of axial movement and vibration that could indicate thrust bearing failure.

Natural gas compression stations utilize 3500/20 125744-02 to monitor compressor shaft position and impeller clearance, with dedicated channels tracking axial thrust and radial movement. The module detects subtle position changes that indicate bearing wear or impeller rubbing, generating alarms that are correlated with vibration data from 3500/40M 140734-01 modules. This combined monitoring approach helps prevent catastrophic compressor failures in remote pipeline stations.

Paper mills employ 3500/20 125744-02 to monitor roll position and alignment in paper machines, where precise positioning is critical for product quality and machinery reliability. The module’s LVDT inputs track roll parallelism, while proximity probes monitor bearing housing movement. Position data is analyzed alongside vibration measurements from 3500/40M 140734-01 modules to identify misalignment issues before they cause sheet breaks or equipment damage in continuous production processes.

BENTLY 3500/20 125744-02

Related model recommendations

3500/40M 140734-01: Vibration monitor whose data correlates with position measurements from this module.

3500/60 163179-01: Display module visualizing position data from 3500/20 125744-02.

3500/15 127610-01: Power supply module providing regulated power to this position monitor.

330106-05-30-10-02-00: Proximity probe system compatible with this module’s input channels.

3500/22M 138607-01: Transient module triggered by position alarms from this monitor.

177230-01-01-05: Extension cable connecting position sensors to this monitoring module.

3500/05-01-01-00-00-01: Communication module transmitting position data to control systems.

3500/25 184684-01: Relay module executing protective actions based on position alarms.

Installation, commissioning and maintenance instructions

Installation preparation: Before installing 3500/20 125744-02, verify the 3500 rack has two adjacent slots available and a properly sized 3500/15 127610-01 power supply. Prepare sensor cabling using shielded twisted-pair wiring (like 177230-01-01-05) for each channel, routing cables separately from power wiring to minimize electromagnetic interference. Confirm the installation environment maintains temperatures within 0°C to +60°C with adequate ventilation for stable operation.

Maintenance suggestions: Include 3500/20 125744-02 in quarterly system inspections, verifying all four channels display stable readings within expected ranges. Perform annual calibration verification using calibrated position references to ensure measurement accuracy across the full range. Inspect sensor connections for corrosion or loosening, cleaning terminals with approved contact cleaner as needed. Coordinate with 3500/40M 140734-01 maintenance schedules to ensure simultaneous calibration of position and vibration monitoring systems. Update firmware during scheduled maintenance to maintain compatibility with other 3500 modules.

Service and guarantee commitment

Bently Nevada provides the 3500/20 125744-02 with a 36-month warranty covering manufacturing defects and performance issues under normal operating conditions, including measurement accuracy, alarm functionality, and communication reliability when used with compatible 3500 series components like 3500/40M 140734-01 and 3500/15 127610-01. Our technical support team offers expert guidance on sensor selection, channel configuration, and position analysis methodologies specific to this monitoring module.

We offer specialized training on position monitoring techniques, module configuration, and troubleshooting to maximize the diagnostic value of data from 3500/20 125744-02. Beyond the warranty period, our service agreements include calibration services, technical support, and expedited replacement to minimize system downtime. Bently Nevada’s commitment to quality ensures reliable position monitoring throughout the module’s operational lifecycle, backed by our global network of service professionals dedicated to protecting your critical machinery assets.