The Bently Nevada 3300/48 Case Expansion Monitor is a rack-mounted module designed to measure the thermal expansion of turbine casings relative to their foundation. This measurement is critical for steam turbines and other large rotating machinery where casing growth can lead to mechanical interference. The monitor continuously compares expansion values against configured alarm setpoints, providing early warning of abnormal conditions to facilitate predictive maintenance.
Features
Measures casing expansion relative to the foundation.
Continuous parameter comparison against Alert and Danger alarm setpoints.
Relay actuation for alarm conditions.
LED indicators for OK, Bypass, Alert, and Danger status.
Compatible with proximity probes or LVDT signals.
Applications
This module is primarily utilized in power generation and industrial facilities for monitoring steam turbine thermal growth, ensuring mechanical alignment and preventing casing damage during thermal cycling.
Technical Specifications
Model
3300/48-03-02-02-00
Brand
Bently Nevada
Series
3300
Operating Temperature
0 to 60 degC
Power Consumption
~1.5 W
Sensitivity
200 mV/mil or 100 mV/mil
Signal Accuracy
+/- 0.33% typical
Outputs
4-20 mA, 1-5 VDC, 0 to -10 VDC
Installation Guidelines
Ensure the 3300 rack is powered down before inserting or removing the module.
Handle the module using standard ESD precautions to prevent damage to internal circuitry.
Ensure the module is fully seated in the rack slot to maintain proper backplane connection.
Use shielded cabling for transducer inputs to minimize EMI interference.
Verify that the transducer signal type matches the module configuration settings.
FAQ
What is the primary function of the 3300/48 monitor?
The module monitors the thermal expansion of turbine casings relative to the foundation, which is essential for preventing mechanical interference in large rotating machinery.
Can this module be used with different types of sensors?
Yes, the 3300/48-03-02-02-00 is configured to accept inputs from proximity probes or LVDTs, depending on the specific application requirements.
What do the alarm setpoints control?
The module provides relay outputs for Alert and Danger conditions, which can be integrated into the plant's safety or control systems to trigger alarms or automated shutdowns.
