The Bently Nevada 3300/55 Dual Velocity Monitor is a rack-mounted module engineered to measure casing vibration velocity using piezo-velocity sensors, such as the Bently Nevada Velomitor. This module provides two independent velocity channels, continuously comparing input signals against user-defined alarm setpoints to provide critical protection for rotating machinery including turbines, compressors, motors, and pumps. By integrating directly into the 3300 rack system, it delivers reliable velocity data essential for both machinery protection and predictive maintenance programs.
Features
Dual-channel velocity monitoring for independent measurement paths.
Compatible with Velomitor piezo-velocity sensors.
Integrated alarm setpoint comparison for Alert and Danger conditions.
Dual relay outputs for automated machinery shutdown or alarm annunciation.
Front-panel LED indicators for system status, including OK, Bypass, Alert, and Danger.
Configurable scaling and output options (4-20 mA, 1-5 VDC, 0 to -10 VDC).
Applications
This module is designed for use in industrial environments where casing vibration monitoring is required to detect mechanical degradation. Typical applications include monitoring of centrifugal pumps, gas and steam turbines, large industrial motors, and reciprocating compressors.
Technical Specifications
Model
3300/55-01-01-02-02-00-00-03-00
Brand
Bently Nevada
Series
3300
Operating Temperature
0 to 60 degC
Power Consumption
~1.5 W
Signal Conditioning Accuracy
±0.33% typical, ±1% max at 25 degC
Output Signals
4-20 mA, 1-5 VDC, 0 to -10 VDC
Installation Guidelines
Ensure the 3300 rack is powered down before inserting or removing the monitor module to prevent electrical damage.
Verify that the module is fully seated in the rack slot to ensure proper backplane connection.
Use shielded twisted-pair cabling for transducer inputs to minimize EMI/RFI interference.
Ensure proper grounding of the 3300 rack system according to site electrical safety standards.
Handle with care using ESD-safe procedures to protect sensitive internal circuitry.
Confirm that the configuration jumpers and software settings match the specific transducer type and required alarm logic before commissioning.
FAQ
What is the purpose of the 3300/55 module?
The 3300/55 is a dual-channel monitor used to measure casing vibration velocity. It processes signals from Velomitor sensors and provides alarm outputs to protect critical rotating equipment.
How are the alarm setpoints managed?
The module continuously compares the input velocity signals against pre-configured setpoints. When these thresholds are exceeded, the module triggers the internal relays to provide Alert or Danger status signals.
Can this module be used with other sensors?
This specific model (3300/55-01-01-02-02-00-00-03-00) is configured for Velomitor piezo-velocity sensors. Consult the Bently Nevada 3300 system manual for compatibility with other sensor types.
