Overview
The Bently Nevada 3300/45-XX-01-03-00, also cataloged as the 3300/45 Dual Differential Expansion Monitor, operates as a dedicated hardware component for differential expansion measurement within the Bently Nevada 3300 Machinery Protection System.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 3300/45-XX-01-03-00 |
| Brand | Bently Nevada |
| Origin | USA |
| Product Type | Dual Differential Expansion Monitor |
| Monitoring Function | Two-channel rotor-to-casing differential expansion measurement |
| System Platform | Bently Nevada 3300 Machinery Protection System |
| Input Type | Proximity probe transducer signals |
| Input Channels | 2 independent channels |
| Input Impedance | 10 kOhm |
| Signal Scale Factor | 20 mV/mil (0.787 V/mm) or 10 mV/mil (0.392 V/mm), jumper selectable |
| Signal Frequency Response | 0 to 10 kHz (+0, -3 dB) |
| Recorder Output | Programmable 4-20 mA, 0 to -10 VDC, or 1 to 5 VDC |
| Recorder Load Resistance | 0 to 600 Ohm for 4-20 mA output |
| Buffered Transducer Output | Front panel coaxial connector and rear terminal block output |
| Transducer Power Supply | -24 VDC, current limited per channel |
| Alarm Function | Alert and Danger alarms for over and under differential expansion |
| Alarm Quantity | 4 setpoints total |
| Alarm Adjustment Range | 0% to 100% of full scale |
| Display Type | Non-multiplexing vertical bargraph LCD |
| Display Resolution | 63 segments per channel |
| LED Indicators | OK, Alert, Danger, and Bypass status |
| Accuracy | +/- 0.33% typical of full scale, +/- 1.0% maximum at 25 deg C |
| Operating Temp | 0 deg C to +65 deg C |
| Storage Temp | -40 deg C to +85 deg C |
| Relative Humidity | Up to 95%, non-condensing |
| Weight | Approx. 1.0 kg |
| Dimensions | 1 slot 3300 System rack module format |
| Power Consumption | 1.5 W nominal |
Eddy-Current Probe Scaling and Rotor Position Measurement
The 3300/45 module processes eddy-current proximity probe signals to calculate differential expansion between the machine rotor and casing. Therefore, the module requires correct probe scaling configuration to maintain measurement accuracy.
The monitor evaluates axial movement changes during thermal expansion periods. Additionally, it tracks expansion direction and magnitude through conditioned displacement signals.
The input circuitry supports gap-related signal validation. Bently Nevada proximity systems commonly use -10 VDC gap voltage targets as a reference point for probe operating range verification.
The module applies signal conditioning to reduce measurement errors caused by probe installation variation, electrical interference, and mechanical vibration effects. It provides buffered transducer outputs for external diagnostic measurement equipment.
Frequently Asked Questions
Q: Can the 3300/45 operate with a single differential expansion measurement point?
A: Yes. The module supports two independent channels, and Channel B can be disabled when only one monitoring location is required.
Q: What type of transducer signal does the 3300/45 accept?
A: The module accepts input signals from Bently Nevada eddy-current proximity probe transducer systems and processes the displacement signal for differential expansion monitoring.
Q: Does the module provide direct alarm outputs for machinery protection systems?
A: Yes. The module provides programmable Alert and Danger alarm functions with relay outputs through the selected alarm relay configuration.
Field Installation Guidelines
- Install the 3300/45 module in an approved Bently Nevada 3300 System rack position.
- Verify proximity probe wiring polarity before applying power to prevent incorrect displacement calculations.
- Route probe cables separately from high-current power conductors to reduce electrical interference.
- Connect cable shields according to site grounding practices and avoid multiple grounding points that may introduce signal loops.
- Confirm probe gap voltage before commissioning. A typical eddy-current probe setup uses a -10 VDC target gap voltage for calibration reference.
- Verify alarm setpoints, recorder output scaling, and channel configuration before placing the monitor into service.
- Use suitable environmental protection when installing the rack in areas outside the specified operating temperature range.
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