Overview
Configured for differential expansion measurement in the Bently Nevada 3300 System, the Bently Nevada 3300/45-01-02-03-00 (3300/45 Dual Differential Expansion Monitor) provides direct signal processing for rotor-to-casing axial position measurement using 35 mm proximity transducers.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 3300/45-01-02-03-00 |
| Brand | Bently Nevada |
| Origin | USA |
| Product Type | Dual Differential Expansion Monitor |
| Measurement Function | Dual-channel differential expansion monitoring |
| Input Signal | Two proximity probe transducer signals |
| Transducer Compatibility | 35 mm proximity transducer |
| Input Impedance | 10 kOhm |
| Signal Scale Factor | 20 mV/mil (0.787 V/mm) or 10 mV/mil (0.392 V/mm), jumper selectable |
| Full Scale Range | 5 – 0 – 5 mm |
| Recorder Output | +4 to +20 mA, 0 to -10 VDC, +1 to +5 VDC |
| Buffered Transducer Output | Front coaxial connector and rear terminal connection per channel |
| Output Impedance | 100 Ohm, short-circuit protected |
| Transducer Supply Voltage | -24 VDC, current limited per channel |
| Alarm Setpoints | Alert and Danger adjustable from 0 to 100% full scale |
| Alarm Repeatability | Within +/- 0.4% of full scale |
| Relay Configuration | Quad Relay, epoxy sealed |
| Display Type | Vertical bargraph LCD, 63 segments per channel |
| Accuracy | Typical +/- 0.33% of full scale; maximum +/- 1% of full scale 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 |
| Power Consumption | 1.5 W nominal |
| Dimensions | Not specified in provided data |
Eddy-Current Probe Scaling and Rotor Dynamics Processing
The 3300/45 module processes proximity probe signals by applying selectable eddy-current probe scaling values for differential expansion measurement. Therefore, the module converts displacement changes into proportional electrical outputs for monitoring rotor axial movement.
The input circuit supports gap-related signal validation through the proximity probe interface. Additionally, Bently Nevada TSI monitoring principles use gap voltage analysis, with -10 VDC target values commonly applied for probe gap verification. The module also supports rotor dynamics monitoring by tracking mechanical expansion behavior during machine thermal cycles.
The signal path includes buffered transducer outputs and isolated measurement processing to reduce signal disturbance from field wiring. Furthermore, the module provides independent Alert and Danger alarm channels for each measurement channel.
Frequently Asked Questions
Q: What type of transducer does the 3300/45-01-02-03-00 accept?
A: The module accepts two proximity probe inputs and is configured for 35 mm proximity transducers.
Q: Does the module provide direct probe gap information?
A: Yes. The vertical bargraph LCD displays probe gap position on the center scale, while the input circuit processes proximity probe displacement signals.
Q: What alarm outputs are available on the -03 relay option?
A: The -03 configuration provides a quad relay assembly with independent Alert and Danger relay contacts for each channel.
Field Installation Guidelines
Install the 3300/45 module in the designated Bently Nevada 3300 rack position according to the system configuration requirements.
Connect proximity probe signals using shielded instrumentation wiring and maintain separation from high-current power cables to reduce electrical interference. Ground cable shields according to site grounding practices while avoiding multiple ground paths.
Verify the proximity probe gap voltage before commissioning. Confirm that the probe output remains within the expected operating range and that the measurement polarity matches the configured displacement direction.
Check recorder outputs, alarm relay operation, and channel status LEDs after installation. Perform functional verification using simulated displacement signals before placing the machinery protection loop into service.
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