Description
Bently Nevada 3300/55 Dual Velocity Monitor Module
Configured for dual-channel vibration signal conditioning in 3300 series machinery protection architecture, the Bently Nevada 3300/55-AXX-BXX-CXX-DXX-EXX-FXX-GXX-HXX (3300/55 Dual Velocity Monitor Module) provides direct physical execution of velocity and integrated displacement measurement from Velomitor input signals within the 3300 monitoring backplane system.
Suffix Breakdown & Model Matrix
| Segment |
Definition |
Selected Configuration |
| 3300/55 |
Base module |
Dual Velocity Monitor |
| AXX |
Channel input option |
Dual velocity inputs (Channel A velocity, Channel B displacement derived) |
| BXX |
Transducer type |
Velomitor 100 mV/in/s |
| CXX |
Channel A range |
0 to 100 um peak-to-peak equivalent scaling |
| DXX |
Channel B range |
0 to 100 um peak-to-peak |
| EXX |
Agency approval |
Not required |
| FXX |
Intrinsic safety |
None |
| GXX |
Alarm relay option |
Quad relay output (Velomitor compatible) |
| HXX |
Trip multiply |
None |
Hardware Specifications
| Parameter |
Specification |
| ModelBrand |
Bently Nevada 3300/55 |
| Origin |
USA |
| Weight |
1 kg |
| OperatingTemp |
0 degC to +65 degC |
| PowerConsumption |
1.5 W |
| Input Type |
Dual Velomitor velocity channels |
| Sensor Interface |
100 mV/in/s seismic velocity transducers |
| Channel A Function |
Velocity (mm/s rms derived scaling) |
| Channel B Function |
Displacement (integrated um peak-to-peak) |
| Frequency Response |
Approx. 4 Hz to 4000 Hz (velocity path) |
| Relay Output |
Quad alarm relay module |
| Accuracy |
+/-0.33 percent full scale at 25 degC |
Bently Nevada Mechanical Signal Processing Characteristics
Channel conditioning architecture applies dedicated separation of velocity-domain and displacement-domain processing paths. Eddy-current probe scaling principles are indirectly supported through displacement integration mapping, ensuring consistency between dynamic casing vibration and inferred shaft motion representation. Gap voltage validation referencing -10 VDC baseline targets is maintained at system integration level when interfacing with proximity-based diagnostic stacks.
Rotor dynamics interpretation is derived from filtered seismic velocity vectors, allowing separation of structural resonance components from broadband vibration noise. Cross-talk suppression is implemented at channel isolation stage, ensuring Channel A and Channel B do not introduce reciprocal signal contamination during simultaneous acquisition.
Frequently Asked Questions
Q: Can the module be hot-swapped during operation?
A: Hot-swap is not supported. Removal requires de-energizing the 3300 backplane slot to prevent relay state corruption and signal bus disturbance.
Q: What is the backplane load requirement per module?
A: The module draws approximately 1.5 W from the system power rail. Total rack loading must be calculated based on cumulative slot population.
Q: Are Channel A and Channel B electrically isolated?
A: Channels share internal processing architecture but maintain separate signal conditioning paths with isolation designed to prevent measurement cross-coupling.
Field Installation Guidelines
Ensure the module is inserted into a compatible 3300 series rack with power disabled during installation. Maintain proper seating alignment with backplane connectors to avoid intermittent signal loss. Use shielded cabling for Velomitor inputs, with single-point grounding at the rack end to minimize ground loop formation. Avoid routing sensor wiring parallel to high-voltage conductors or VFD output lines. Verify relay terminal torque specifications according to cabinet wiring standards before energization.
