The Bently Nevada 3500/64M is a single-slot, four-channel dynamic pressure monitoring module for the 3500 Machinery Protection System. It is designed for continuous monitoring and protection of dynamic pressure signals—such as cylinder pressure pulsation and bearing oil pressure fluctuations—in rotating machinery including steam turbines, compressors, and pumps.
The module extracts critical frequency components through independent bandpass filtering, supports multi-level alarm protection, and is suitable for high-temperature and harsh operating environments.

Core Features and Technical Characteristics

Dynamic Pressure Monitoring
Each channel is independently equipped with bandpass filtering to extract key frequency components associated with rotating machinery dynamics, such as shaft speed and its harmonics. This capability makes the 3500/64M well suited for monitoring pressure pulsation, combustion instability, and lubrication system dynamics in high-temperature applications.

Flexible Signal Processing Configuration
The module supports flexible configuration of:

Bandpass cutoff frequencies

Notch filters (e.g. 50/60 Hz power frequency suppression)

Multi-level alarm setpoints

All parameters are configured via the 3500 Rack Configuration Software, allowing precise adaptation to specific machine and process characteristics.

Integration and Communication
Provides 4–20 mA analog outputs for integration with DCS and ESD systems, as well as dry-contact relay outputs to drive local alarms or shutdown functions. Supports System 1 software for remote monitoring, data trending, and advanced fault diagnosis.

High Reliability and Maintainability
Features channel-to-channel electrical isolation for strong noise immunity and anti-interference performance. The module supports hot swapping, allowing maintenance or replacement without interrupting system operation. Built-in sensor failure detection helps prevent false alarms and enhances overall protection reliability.

Bently Nevada 3500/64M｜Dynamic Pressure Monitor｜