Bently Nevada 3500/64M Dynamic Pressure Monitor
A four-channel rack monitor for bandpass dynamic-pressure protection using high-temperature pressure transducers.
Product Identification
3500/64M processes dynamic-pressure signals in a Bently Nevada 3500 rack. Each active channel conditions its transducer input, applies configured filtering and compares the resulting value with alarm setpoints.
The monitor is intended for machinery protection and for supplying useful dynamic-pressure information to operations and maintenance systems.
Engineering Data
| Manufacturer | Bently Nevada, a Baker Hughes business |
|---|---|
| Model | 3500/64M |
| Product Family | 3500 Machinery Protection System |
| Monitor Type | Dynamic Pressure Monitor |
| Channel Count | Four |
| Accepted Signal | High-temperature pressure-transducer input |
| Measured Variable | Bandpass dynamic pressure |
| Nominal Sensitivity | 100 mV/psi |
| Recorder Output | 4–20 mA per channel |
| Recorder Load | 0–600 Ω |
| Buffered Output Impedance | 550 Ω |
| Rack Requirement | One full-height front slot plus one matching rear slot |
Functions
- Configurable high-pass, low-pass and notch filtering isolates the pressure band of interest.
- Cascade mode can route one transducer input to multiple processing channels for different filter windows.
- Individual recorder values support connection to plant control or trending systems.
- Front buffered outputs permit service observation while permanent connections remain in place.
Applications
- Gas-turbine combustor instability monitoring with an approved dynamic-pressure sensor chain.
- Machinery-protection duties that depend on alarmed bandpass pressure rather than static process pressure.
- Multi-band analysis where one transducer signal is intentionally processed through separate channel settings.
Lifecycle
- Archive channel-pair filter modes, corner frequencies, notch settings, scales and alarm delays.
- Record the rear I/O option and the complete pressure-transducer or charge-amplifier chain.
- Validate recorder routing and every alarm path after monitor or I/O replacement.
FAQ
Can 3500/64M measure ordinary static process pressure?
Its documented role is bandpass dynamic-pressure monitoring; use the correct process-variable architecture for static measurements.
When is cascade mode useful on 3500/64M?
It is useful when one approved transducer signal must be evaluated through several different filter and full-scale settings.
Which sensor information is needed for a 3500/64M quotation?
Provide the pressure transducer, charge amplifier if used, sensitivity, cabling, rear I/O and desired measurement band.
Can channel pairs on 3500/64M use unrelated filter modes?
The configured pair shares its low- or high-mode family, so the complete channel plan should be reviewed before assignment.
What should be backed up before exchanging 3500/64M?
Save scales, filter selections, notch settings, alarms, delays, recorder mapping and rack-slot information.
What commissioning evidence is important for 3500/64M?
Record sensor-bias checks, injected-signal response, filter behavior, alarms, relays and recorder-loop verification.
