The BENTLY 3500/34 is designed for the most demanding applications where system availability is paramount. As a TMR RMS Interface Module, it utilizes a voting logic system that compares signals from three independent monitors. This architecture ensures that even if one monitoring channel fails, the protection system remains functional, preventing both false trips and failures to trip.
The 3500/34 focuses on Root Mean Square (RMS) signal processing. This measurement technique is essential for assessing the energy levels in vibration signals, particularly for auxiliary equipment like pumps and fans. The module provides accurate, real-time RMS values to the 3500 system, allowing for precise alarm and trip setpoints that reflect the actual mechanical health of the asset.

The 3500/34 works in conjunction with 3500 relay modules to execute emergency shutdowns. The TMR logic ensures that a relay is only actuated if the majority of the monitoring channels agree that a danger condition exists. This significantly increases the reliability of the safety instrumented function (SIF) within the plant's overall safety strategy.
Using the 3500 Rack Configuration Software, engineers can define the specific measurement ranges and alarm delays for the 3500/34. The module provides comprehensive self-diagnostics, monitoring the health of the three internal paths and reporting any discrepancies to the system controller. This allows for proactive maintenance of the protection system itself.
Typical applications for the BENTLY 3500/34 include high-value turbomachinery in the nuclear power, oil and gas, and petrochemical sectors. Its ability to provide continuous protection while minimizing the risk of unnecessary downtime makes it a cornerstone of modern industrial reliability programs.



