3500/42 - Proximitor Seismic Monitor Module

3500/42 - Proximitor Seismic Monitor Module 3500/42 - Proximitor Seismic Monitor Module

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Part Number: 3500/42
Manufacturer: Bently Nevada
Series: 3500
Dimensions: 241.3 mm x 24.4 mm x 241.8 mm
Weight: 0.91 kg (2.0 lbs)
Product type: Proximitor Seismic Monitor Module
Radiated Emissions: EN 55011, Class A
Conducted Emissions: EN 55011, Class A
Electrostatic Discharge: EN 61000-4-2
Radiated Susceptibility: ENV 50140
Conducted Susceptibility: ENV 50141
Availability: In Stock
Country of Manufacture: United States (USA)

Functional Description

3500/42 is a Proximitor Seismic Monitor Module designed and developed by Bently Nevada. Designed to handle a spectrum of monitoring tasks across four distinct channels. It seamlessly interfaces with Proximitor and Seismic Transducers, extracting crucial input from these devices and subsequently translating this data into actionable alarms. Through the utilization of the 3500 Rack Configuration Software, this monitor gains programmability that empowers it to fulfill a diverse range of functions. Each of the following functions can be assigned to the monitor's channels as required:

  • Radial Vibration: The monitor has the capacity to assess radial vibration, which refers to the oscillations or movements occurring perpendicular to a given axis. By analyzing the radial vibration data from transducers, the monitor can generate alarms when vibration levels exceed predefined thresholds, enabling timely intervention to prevent potential equipment malfunctions or failures.
  • Thrust Position: Thrust position monitoring is crucial for applications involving rotating machinery. The monitor can accurately track the position of thrust components within a mechanism and trigger alarms if these positions deviate from the expected range. This helps in maintaining optimal operational conditions and prevents issues that might arise due to improper thrust positioning.
  • Eccentricity: Eccentricity refers to the deviation of an object's center from a reference point or axis. The monitor's capability to monitor eccentricity allows it to detect any misalignment or irregularities in the rotational machinery's components. When eccentricity surpasses set limits, the monitor is poised to alert operators, minimizing potential risks associated with imbalanced machinery.
  • Differential Expansion: Differential expansion monitoring involves tracking the variations in expansion rates between two components. By comparing these rates, the monitor can identify discrepancies that might indicate mechanical problems or stress differentials. Alarms triggered based on differential expansion data provide valuable insights into potential issues, enabling prompt corrective actions.
  • Acceleration: Acceleration monitoring focuses on gauging the rate of change in velocity of a moving object. By processing acceleration data obtained from transducers, the monitor can detect rapid changes or fluctuations that might signify abnormal conditions or impending failures. Alarms based on acceleration data play a critical role in maintaining operational safety and preventing catastrophic failures.
  • Velocity: Velocity monitoring involves observing the speed of an object's movement. By assessing velocity data from transducers, the monitor can identify changes in velocity patterns that could indicate irregular behavior or issues within the machinery. Alarms based on velocity variations contribute to predictive maintenance strategies by alerting operators to potential problems before they escalate.


  • Ensures machinery safeguarding by consistently juxtaposing the ongoing machine vibration levels with predetermined alarm thresholds. This dynamic evaluation prompts the activation of alarms when deviations beyond these thresholds occur. This vigilant oversight helps prevent potential issues or malfunctions and underscores the monitor's pivotal role in maintaining equipment integrity.
  • Secondly, the monitor supplies imperative machine vibration insights to both operators and maintenance personnel. This data is crucial for informed decision-making and proactive maintenance strategies. The provision of real-time vibration information empowers personnel to grasp the machinery's operational condition promptly, enabling them to undertake necessary actions to ensure smooth functioning.
  • These alarm thresholds, known as alarm setpoints, are established through the utilization of the 3500 Rack Configuration Software. This software serves as the control hub for defining these thresholds, allowing precise tailoring of the alarm criteria to match the specific requirements of the machinery and the operational context. Furthermore, the flexibility of the software enables the configuration of danger setpoints for two of the active proportional values, adding an extra layer of adaptability and safety to the monitoring process.

LED Description

  • OK: It serves as an assurance that both the Proximitor/Seismic Monitor and the Proximitor/Seismic I/O Module are functioning as intended and are in a proper operational state. This visual indication is a key confirmation for users that the monitoring system is running without any significant issues.
  • TX/RX: It flashes at a frequency corresponding to the rate at which messages are being sent and received within the system. This pulsating LED offers real-time feedback on the data exchange process, giving users an insight into the ongoing communication activity between various components.
  • BYPASS: Signals that certain functions of the monitor have been temporarily suppressed. This might occur intentionally during specific scenarios, where certain monitoring features are intentionally deactivated for a defined period. This could be due to maintenance activities, troubleshooting, or other operational considerations. The illuminated BYPASS LED serves as a clear visual cue that the monitor is operating in a restricted mode and that certain monitoring aspects are currently on hold.

Alarm Setpoints

  • It have the flexibility to establish alert levels for every measured value captured by the monitor. An option is available to define Danger setpoints for two out of the measured values. This configuration of alarm and danger thresholds is accomplished through software settings. Notably, the alarms are customizable, allowing adjustments within a range spanning from 0 to 100% of the Full Scale for each specific measured parameter.
  • If the Full Scale range of measurement surpasses the range capacity of the transducer, then the setpoint value becomes confined to the limits of the transducer's range. This adjustment ensures compatibility and accurate representation of the transducer's capabilities.
  • The precision of the alarm accuracy is maintained within an impressive margin of only 0.13% deviation from the intended value. This degree of accuracy underscores the monitor's reliability in consistently alerting users to any deviations or abnormal conditions, enhancing the overall monitoring efficacy.

WOC is happy to assist you with any of your Bently Nevada requirements. Please contact us by phone or email for pricing and availability on any parts and repairs.


What is 3500/42?
It is a Proximitor Seismic Monitor Module designed and developed by Bently Nevada.

What is the primary role of the component?
It is designed to ensure machinery protection. It accomplishes this by constantly comparing the current vibration levels of a machine with preconfigured alarm thresholds. If deviations beyond these thresholds are detected, the monitor triggers alarms to prevent potential issues. Secondly, it serves as a source of vital machine vibration data for both operators and maintenance personnel.

How does the monitor achieve machinery protection?
The monitor continuously monitors the machine's vibration levels and compares them to preset alarm setpoints. When the measured vibration exceeds these setpoints, the monitor activates alarms. This proactive approach helps prevent malfunctions and ensures equipment integrity.

Who benefits from the machine vibration information provided by the monitor?
Both operators and maintenance personnel benefit from the machine vibration data. Operators gain insights into the real-time operational condition of the machinery, enabling them to make informed decisions. Maintenance personnel can use this data for predictive maintenance, identifying potential issues before they lead to breakdowns.

How are the alarm setpoints configured?
Alarm setpoints are configured using the 3500 Rack Configuration Software. This software enables users to define specific vibration levels that will trigger alarms. These settings are customizable to suit the machinery and operational requirements.

Can alarm setpoints be tailored for different parameters?
Yes, alarm setpoints can be configured for each active proportional value. This allows customization for different aspects of the machinery's behavior, ensuring the monitor's sensitivity aligns with specific requirements.