Overview
The Bently Nevada 3300/48-02-01-00-00, also cataloged as the 3300/48 Case Expansion Monitor, operates as a dedicated hardware component for measuring thermal case expansion signals from LVDT transducers within the Bently Nevada 3300 Series Monitoring System.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 3300/48-02-01-00-00 |
| Brand | Bently Nevada |
| Origin | USA |
| Weight | Approx. 1.0 kg |
| Dimensions | 3300 Series rack module format, 1 rack position |
| Operating Temp | 0 deg C to +65 deg C |
| Storage Temp | -40 deg C to +85 deg C |
| Humidity | Up to 95%, non-condensing |
| Power Consumption | 1.5 W nominal |
| Product Type | Case Expansion Monitor Module |
| System Compatibility | Bently Nevada 3300 Series Monitoring System |
| Input Signal | Two DC LVDT transducer inputs |
| Input Impedance | 1.0 MOhm |
| Measurement Mode | Dual independent channels or differential expansion measurement |
| Full Scale Range | 0 to 2.0 inches or calibrated equivalent range |
| Signal Conditioning Accuracy | +/- 0.33% typical, +/- 1% maximum at +25 deg C |
| Recorder Outputs | +4 to +20 mA, 0 to -10 VDC, or +1 to +5 VDC |
| Display Type | Non-multiplexing vertical LCD bargraph |
| Display Resolution | +/- 1.6% of monitor full scale |
| Status Indicators | OK, Alert, Danger, Bypass LEDs |
| Relay Option | No relay output |
Rotor Dynamics and Case Expansion Signal Processing
The 3300/48 module processes LVDT-based case expansion measurements for turbine casing movement monitoring. It receives two DC LVDT signals and calculates thermal expansion displacement relative to the machine foundation.
Furthermore, the module supports differential expansion calculation by comparing two LVDT inputs. This configuration allows operators to evaluate relative casing movement caused by thermal gradients during startup, shutdown, and load changes.
The module applies signal conditioning techniques used in Bently Nevada machinery protection systems. Therefore, the measurement circuit maintains stable displacement tracking while reducing measurement errors caused by electrical interference and signal variation.
Frequently Asked Questions
Q: Can the 3300/48-02-01-00-00 measure both independent and differential case expansion?
A: Yes. The module supports two independent LVDT measurement channels or one differential measurement channel using both LVDT inputs.
Q: What type of transducer input does the 3300/48-02-01-00-00 accept?
A: The module accepts DC LVDT transducer signals and provides conditioned outputs for monitoring and recording systems.
Q: Does this module provide relay shutdown outputs?
A: No. The 3300/48-02-01-00-00 configuration does not include relay outputs and provides signal monitoring functions only.
Field Installation Guidelines
Install the 3300/48 module in an available position within the Bently Nevada 3300 rack according to the rack configuration requirements.
Connect LVDT wiring using proper shielding and grounding practices to minimize electrical noise interference. Keep signal cables separated from high-current power conductors and switching circuits.
Verify LVDT polarity and calibration before commissioning. Confirm that the measured displacement direction matches the configured expansion movement.
For turbine applications, validate the mechanical installation of LVDT transducers and ensure the sensor mounting arrangement allows accurate casing movement detection.
Check recorder output configuration before connecting external control or monitoring equipment. Confirm the selected output range matches the receiving device input requirements.
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