Overview
The Bently Nevada 3300/55-03-04-14-14-00-00-04-00, also cataloged as the 3300/55 Dual Velocity Monitor, operates as a dedicated hardware component for velocity signal processing and vibration monitoring within the Bently Nevada 3300 Series Machinery Protection System.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 3300/55-03-04-14-14-00-00-04-00 |
| Brand | Bently Nevada |
| Origin | USA |
| Product Type | Dual Velocity Monitor |
| System Platform | Bently Nevada 3300 Series Machinery Protection System |
| Channels | 2 independent velocity monitoring channels |
| Transducer Type | Velomitor velocity transducer, 100 mV/in/s |
| Measurement Range | 0 to 100 um peak-to-peak for Channel A and Channel B |
| Input Signal | Standard velocity sensor input |
| Transducer Power Supply | -24 VDC |
| Accuracy | +/- 0.33% of full scale typical at +25 deg C; +/- 1% maximum excluding filters and integration |
| Frequency Response | 3 Hz to 3 kHz nominal -3 dB in Velomitor mode |
| Display | Front panel vertical bargraph LCD per channel |
| Recorder Output | Field programmable: +4 to +20 mA, 0 to -10 VDC, or +1 to +5 VDC proportional to full scale |
| Buffered Output | Front panel coaxial connector for raw sensor signal access |
| Operating Temp | 0 deg C to +65 deg C |
| Storage Temp | -40 deg C to +85 deg C |
| Relative Humidity | Up to 95%, non-condensing |
| Rack Position | 1 position in Bently Nevada 3300 System Rack |
| Weight | Approx. 1.0 kg |
Rotor Dynamics Signal Processing and TSI Monitoring Features
The Bently Nevada 3300/55 receives velocity signals from Velomitor transducers and performs signal conditioning, filtering, and alarm evaluation. Therefore, the module converts vibration velocity inputs into monitored displacement-related values for machinery protection functions.
The monitor supports rotor dynamics evaluation by processing vibration behavior across the configured frequency range. In addition, the module maintains signal integrity through controlled input conditioning and filtering functions.
The 3300/55 platform uses sensor scaling principles associated with Bently Nevada machinery monitoring systems. For eddy-current based TSI channels, gap voltage validation commonly references -10 VDC targets; however, this velocity monitor configuration uses Velomitor input signals rather than proximity probe gap measurements.
The dual-channel architecture allows independent Channel A and Channel B vibration measurement. As a result, operators can compare separate machine measurement points while maintaining isolated monitoring paths.
Frequently Asked Questions
Q: What type of transducers can the 3300/55-03-04-14-14-00-00-04-00 accept?
A: The module accepts Velomitor velocity transducers with a 100 mV/in/s signal output.
Q: Does this configuration include intrinsic safety barriers or agency approvals?
A: No. The selected configuration uses 00 for agency approval and 00 for intrinsic safety barrier options.
Q: What output signals can the recorder interface use?
A: The recorder output can be configured as +4 to +20 mA, 0 to -10 VDC, or +1 to +5 VDC proportional to full scale.
Field Installation Guidelines
Install the 3300/55 module in an available slot of the Bently Nevada 3300 System Rack. Verify that the rack backplane connection is correctly seated before applying system power.
Connect Velomitor transducers using shielded instrumentation cables. Route sensor wiring separately from high-voltage power conductors to reduce electrical interference.
Ground cable shields according to the site grounding practice. Avoid creating multiple ground paths that may introduce signal noise into low-level vibration measurement circuits.
Before operation, verify sensor polarity, input wiring continuity, and the configured full-scale measurement range. Confirm that recorder outputs match the required plant monitoring interface.
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