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The 3300/48-02-01-00-00 is a precision thermal growth monitoring module for the Bently Nevada 3300 rack system. It is specifically designed to track machine case expansion in large steam turbines, ensuring that thermal growth occurs...
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The 3300/48-02-01-00-00 is a precision thermal growth monitoring module for the Bently Nevada 3300 rack system. It is specifically designed to track machine case expansion in large steam turbines, ensuring that thermal growth occurs within safe mechanical tolerances during startup and operation.
By monitoring the differential or absolute movement of turbine housings, this module helps prevent structural stress, misalignment, or binding of rotating components. It converts measurements from LVDT transducers into reliable electrical signals compatible with the 3300 rack system, enabling timely alerts and integration with supervisory control systems.
| Specification | Description |
|---|---|
| Model Series | 3300/48 |
| Full Part Number | 3300/48-02-01-00-00 |
| Primary Function | Thermal case expansion monitoring |
| Input Channels | 2 independent LVDT transducer inputs |
| Measurement Range | 0 to 25 mm (configurable) |
| Analog Output | 4-20 mA proportional signal |
| Operating Voltage | 18–36 VDC (via 3300 rack backplane, nominal 24 VDC) |
| Accuracy | ±1% of full scale |
| Thermal Operating Range | -20°C to +65°C (-4°F to +149°F) |
| Alarming | Independent Alert and Danger setpoints per channel |
| Signal Conditioning | Built-in transducer health monitoring (OK/Fault) |
Monitoring HP and IP steam turbine sections
Ensuring turbine casing can expand freely during startup
Preventing mechanical rubbing or misalignment due to stuck or uneven expansion
Integrating with machine protection logic for turbine supervisory systems
Why is case expansion monitoring critical during turbine startup?
Different turbine components heat at different rates. If the casing does not expand correctly (e.g., a lubricated slide is stuck), it can cause internal rubbing, misalignment, or structural stress. The 3300/48-02-01-00-00 alerts operators before damage occurs.
Can the module support dual-sensor voting?
The module provides two independent channels, typically for monitoring two separate points (e.g., left and right sides). The 3300 rack can implement logic schemes using these signals for comprehensive turbine protection.
