Overview
The Bently Nevada 3300/45-02-01-03-00, also cataloged as the 3300/45 Dual Differential Expansion Monitor, operates as a dedicated hardware component for measuring rotor-to-casing axial expansion displacement within the Bently Nevada 3300 Monitoring System.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 3300/45-02-01-03-00 |
| Brand | Bently Nevada |
| Product Type | Dual Differential Expansion Monitor |
| Origin | USA |
| System Platform | Bently Nevada 3300 Monitoring System |
| Measurement Function | Rotor and casing differential expansion monitoring |
| Channel Configuration | Two independent measurement channels |
| Transducer Input | 25 mm proximity probe transducer |
| Input Impedance | 10 kOhm |
| Full Scale Range | 0 to 10 mm |
| Signal Scale Factor | Jumper selectable: 20 mV/mil or 10 mV/mil |
| Accuracy | Typical +/- 0.33% of full scale at 25 deg C; maximum +/- 1% |
| Alarm Setpoints | Four setpoints per channel: two over-expansion and two under-expansion |
| Buffered Output | Front panel coaxial connector and rear terminal output |
| Recorder Output | +4 to +20 mA, 0 to -10 VDC, or +1 to +5 VDC |
| Relay Output | Quad epoxy-sealed relay module for alarm and trip logic |
| Power Consumption | 1.5 W nominal |
| Weight | Approx. 1.0 kg |
| Dimensions | Standard 3300 rack module format |
| Operating Temp | 0 deg C to +65 deg C |
| Mounting Type | 19-inch Bently Nevada 3300 rack installation |
Eddy Current Probe Scaling and Rotor Dynamics Monitoring
The 3300/45-02-01-03-00 processes displacement signals from eddy-current proximity probes to evaluate axial differential expansion between the rotor and machine casing. The monitor applies selectable probe scaling values to match transducer sensitivity and measurement range requirements.
Additionally, the module validates displacement behavior through conditioned gap voltage measurement. Bently Nevada proximity systems typically use -10 VDC gap voltage targets as a reference point for correct probe positioning and signal stability. The monitor maintains signal conditioning accuracy for rotor dynamics analysis during thermal transients, startup sequences, and load variation conditions.
The module also reduces measurement interference through input signal conditioning, allowing independent Channel A and Channel B operation for dual-location expansion monitoring.
Frequently Asked Questions
Q: What type of transducer does the 3300/45-02-01-03-00 accept?
A: The module accepts 25 mm proximity probe transducer signals for differential expansion measurement applications.
Q: Can the 3300/45-02-01-03-00 operate with only one measurement channel?
A: Yes. Channel B can be disabled when the application requires only one differential expansion measurement point.
Q: What output signals are available from this monitor?
A: The module provides buffered transducer outputs and programmable recorder outputs including +4 to +20 mA, 0 to -10 VDC, and +1 to +5 VDC.
Field Installation Guidelines
- Install the module in the designated slot position of a Bently Nevada 3300 rack following rack configuration requirements.
- Connect proximity probe wiring using shielded instrumentation cable to reduce electrical interference.
- Ground cable shields according to site grounding practices while avoiding unwanted ground loops.
- Verify probe installation position before operation and confirm gap voltage values during commissioning.
- Route transducer cables separately from high-voltage power conductors and switching circuits.
- Confirm relay wiring polarity and alarm logic configuration before connecting external protection circuits.
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