Overview
The Bently Nevada 3300/45-02-02-03-00, also cataloged as the 3300/45 Dual Differential Expansion Monitor, operates as a dedicated hardware component for axial rotor-to-casing position measurement within the Bently Nevada 3300 Machinery Monitoring System.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 3300/45-02-02-03-00 |
| Brand | Bently Nevada |
| Product Type | Dual Differential Expansion Monitor |
| System Platform | Bently Nevada 3300 Machinery Monitoring System |
| Origin | USA |
| Weight | Approx. 1.0 kg (2.2 lbs) |
| Operating Temp | 0 deg C to +65 deg C |
| Storage Temp | -40 deg C to +85 deg C |
| Humidity | 95% non-condensing |
| Power Consumption | Not specified in available documentation |
| Input Channels | 2 proximity transducer channels |
| Input Impedance | 10 kOhm |
| Transducer Supply Voltage | -24 VDC, short-circuit protected per channel |
| Full Scale Range | 0 – 35 mm |
| Measurement Accuracy | Typical +/- 0.33% of full scale; Maximum +/- 1% of full scale at +25 deg C |
| Display Interface | Dual LCD bargraph display with OK, Alert, Danger, and Bypass status indicators |
| Recorder Output | +4 to +20 mA, +1 to +5 VDC, or 0 to -10 VDC selectable |
| Current Output Load | Up to 600 Ohm |
| Alarm Settings | Digitally adjustable Alert and Danger thresholds from 0 to 100% of full scale |
| Relay Configuration | Quad hermetically sealed relays |
| Relay Operation | Normally energized or de-energized, latching or non-latching selectable |
| Transducer Compatibility | 3300 XL 8 mm, 3300 XL 11 mm, 3300 5 mm, and 3300 8 mm Proximitor Sensor systems |
Eddy-Current Probe Scaling and Rotor Dynamics Processing
The Bently Nevada 3300/45-02-02-03-00 processes eddy-current probe signals to determine differential expansion between the rotating shaft and stationary casing structure. The module applies probe scaling parameters to convert displacement signals into engineering units.
In addition, the monitor supports rotor dynamics evaluation by continuously tracking axial position changes during thermal transients. Therefore, operators can observe rotor movement behavior during machine startup, shutdown, and load variation conditions.
The transducer input circuit validates probe operation through gap voltage monitoring. The Bently Nevada proximity system commonly uses -10 VDC gap voltage targets as a reference point for proper probe positioning and signal conditioning.
Frequently Asked Questions
Q: What type of transducer signals does the Bently Nevada 3300/45-02-02-03-00 accept?
A: The monitor accepts two proximity transducer inputs from compatible Bently Nevada eddy-current probe systems, including 3300 XL and 3300 series Proximitor Sensor configurations.
Q: How does the module provide alarm outputs?
A: The module provides Alert and Danger alarm functions through four hermetically sealed relays. Users can configure relay operation as normally energized or de-energized with latching or non-latching behavior.
Q: Does the monitor provide direct signal outputs for control systems?
A: Yes. The module provides programmable recorder outputs including +4 to +20 mA, +1 to +5 VDC, and 0 to -10 VDC signals for connection to DCS or PLC systems.
Field Installation Guidelines
Install the 3300/45-02-02-03-00 module in the designated slot of the Bently Nevada 3300 rack following the system installation manual.
Connect proximity probe wiring using shielded instrumentation cables. Ground cable shields according to the plant grounding practice to reduce electrical interference and signal noise.
Route transducer cables separately from high-voltage power conductors and switching circuits. Maintain proper cable separation to minimize electromagnetic coupling.
Verify probe installation position before operation. Check gap voltage values and confirm that the proximity system provides stable displacement signals before enabling alarm functions.
Configure Alert and Danger setpoints according to the mechanical operating limits of the monitored turbine, compressor, or rotating equipment.
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