3500/44 - Aeroderivative Monitor

3500/44 - Aeroderivative Monitor 3500/44 - Aeroderivative Monitor

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Part Number: 3500/44
Manufacturer: Bently Nevada
Series: 3500
Product type: Aeroderivative Monitor
Dimensions: 241.3 mm x 24.4 mm x 241.8 mm
Weight: 0.91 kg (2.0 lbs)
Humidity: 95% non-condensing
Availability: In Stock
Country of Manufacture: United States (USA)

Functional Description

3500/44 is an Aeroderivative Monitor designed and developed by Bently Nevada. With four channels at its disposal, this monitor is equipped to meet the distinct demands of gas turbine environments. It efficiently takes in input from four Velocity Transducers, employing the Bently Nevada interface modules 86517 and 86497, and leverages these inputs to effectively trigger alarms when necessary. The monitor's capabilities are expansive and versatile, enhancing the operational integrity of Aeroderivative Gas Turbines. The core objective of the monitor is two-fold: Firstly, it serves as a pivotal guardian of machinery integrity by constantly evaluating prevailing machine vibration against preset alarm thresholds, triggering alarms when discrepancies arise. Secondly, it acts as a vital source of imperative machine vibration insights, catering to both operator and maintenance personnel needs.


  • Configuration of alarm setpoints, a critical aspect of the monitor's functionality, is seamlessly achieved through the utilization of the 3500 Rack Configuration Software. This software provides a platform for customizing specific vibration levels that, when exceeded, activate alarms. This flexibility extends to the configuration of alarm setpoints for each active proportional value, ensuring a tailored response to distinct operational requirements. Furthermore, the option to set danger setpoints for two of these active proportional values introduces an additional layer of safety to the monitoring process.
  • Upon leaving the manufacturing facility, the system is delivered without any preset configurations, ensuring its adaptability to a range of applications. When the need arises, the monitor can be readily integrated into a 3500 rack and then configured to fulfill the precise monitoring tasks demanded by the situation. This dynamic capability offers a strategic advantage, allowing a single monitor to be kept in stock and utilized as a versatile standby for a multitude of applications.


A defining feature of the monitor is its programmability, facilitated through the use of the 3500 Rack Configuration Software. This software serves as the control center, enabling the monitor to adopt various filter options based on the specific requirements of each application. The following filter options are available, each offering a distinct approach to processing and presenting vibration data:

  • Integration: The Integration filter option serves to present Velocity inputs in terms of displacement units. This conversion enhances the clarity of the data, allowing operators and maintenance personnel to grasp the vibration's impact on the machinery's movement. By translating Velocity data into displacement units, this filter enables more intuitive analysis of the turbine's behavior.
  • Tracking: The Tracking filter option is tailored for addressing 1X Vibration, referring to the vibration frequency that corresponds to the rotational speed of the machinery. This filter precisely tracks and isolates vibration occurring at this frequency, allowing for targeted monitoring and precise analysis. By focusing on 1X Vibration, the monitor can provide essential insights into the turbine's operational condition.
  • Band-pass: The Band-pass filter option operates with the intention of scrutinizing Band-pass Vibration. This filter confines its analysis to a specific range of frequencies, effectively isolating and examining vibration within that range. This approach is particularly useful for identifying vibrations that fall within a designated frequency band of interest, which might be indicative of specific mechanical issues or conditions.


  • Keyphasor Module Installation: To effectively utilize a Keyphasor channel, it is imperative to have a Keyphasor Module integrated within the rack. This module serves as the foundational component for collecting and processing data.
  • Transducer Types: The range of permissible full-scale options for each proportional value is contingent upon the type of transducer in use. Different transducers may have varying operating ranges, and these should be matched with the configuration settings.
  • Setpoint Configuration: Setpoints can only be configured for proportional values that have been activated. This means that before defining specific thresholds or limits, the relevant proportional value must be selected and enabled.
  • Full-Scale Range Adjustments: Any adjustments made to the full-scale range of a proportional value should be accompanied by a corresponding modification of setpoints associated with that proportional value. This ensures that the monitoring and alerting system remains accurate and aligned with the updated parameters.
  • 1X Amplitude and Band-pass Settings: In situations where either the 1X Amplitude (Ampl) or Band-pass features are enabled, and the Integrate box is checked, it is mandatory to set the Trip Multiply value to 2.0 or lower. This setting helps define the criteria for triggering alarms or shutdowns based on the integrated signal.
  • Concurrent Activation Limitations: The system is designed to limit concurrent activation to only one or two proportional values at any given time. These values may include Direct, 1X Amplitude (Ampl), or Bandpass. This limitation is in place to ensure that the monitoring system remains manageable and that data collection and processing are not overly complex.

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 3500/44?
It is a Aeroderivative Monitor designed and developed by Bently Nevada.

How is accuracy ensured in the TMR configuration?
To ensure accuracy and prevent false alarms, two levels of voting are employed. The first level takes place on the TMR Relay Module, using a 2 out of 3 method. This means that for a relay to be activated, at least two out of the three monitors must agree on the alarm outputs.

Where can I find more details about the first level of voting on the TMR Relay Module?
For a comprehensive understanding of the first level of voting, including its mechanics and implications, refer to the Relay Module Operation and Maintenance Manual. This resource elaborates on the intricacies of this voting mechanism.

What is the second type of voting referred to as?
The second type of voting is termed Comparison voting. This voting strategy involves comparing the proportional value outputs of each monitor within the group.

How does Comparison voting work?
In voting, each monitor's proportional value output is compared with the outputs of the other monitors in the same group. If the output of one monitor differs from the others by a specified margin, that monitor records an entry in the System Event list, flagging a potential discrepancy.

How is Comparison voting configured?
To configure Comparison, access the Rack Configuration Software and set parameters for Comparison and percentage Comparison. These settings allow you to establish the conditions under which discrepancies trigger system alerts.