Overview
Configured for axial shaft displacement measurement in the Bently Nevada 3300 Series Machinery Protection System, the Bently Nevada 3300/20-13-03-01-00-00 (3300/20 Dual Thrust Position Monitor) provides direct monitoring of two independent proximity probe input channels for thrust position evaluation.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 3300/20-13-03-01-00-00 |
| Brand | Bently Nevada |
| Origin | USA |
| Product Type | Dual Thrust Position Monitors |
| Measurement Function | Dual-channel axial shaft thrust position monitoring |
| Input Signal | Eddy-current proximity probe transducer signals |
| Input Channels | 2 independent thrust position channels |
| Measurement Variable | Shaft axial displacement and probe gap voltage |
| Probe Compatibility | Bently Nevada Proximitor systems including 3300 XL proximity transducers |
| Input Impedance | 10 kOhm nominal |
| System Interface | Bently Nevada 3300 Series rack backplane |
| Power Supply | -24 VDC from 3300 rack backplane |
| Relay Output | Alert and Danger alarm relay outputs |
| Buffered Output | Raw gap voltage diagnostic output |
| Recorder Output | Proportional position output, typically 4-20 mA or 0-10 VDC |
| Dimensions | 3300 Series full-height rack module format |
| Weight | Approx. 1.0 kg to 2.5 kg depending on configuration |
| Operating Temp | -30 deg C to +65 deg C |
| Storage Temp | -40 deg C to +85 deg C |
| Relative Humidity | 5% to 95% non-condensing |
| Power Consumption | Supplied through 3300 rack backplane |
Eddy-Current Probe Scaling and Rotor Position Monitoring
The Bently Nevada 3300/20 module processes eddy-current probe signals to measure axial rotor movement relative to machine casing reference points. The module evaluates probe gap voltage and converts the electrical input into thrust position data.
Furthermore, the monitor supports gap voltage validation based on standard Bently Nevada proximity measurement practices, including verification of probe operation near the -10 VDC target region. This process helps maintain correct probe scaling and prevents inaccurate axial displacement measurements caused by incorrect installation or probe calibration.
The dual-channel architecture allows the module to compare independent thrust position signals. Therefore, the monitor can support alarm logic configurations that reduce false trips caused by individual probe signal disturbances.
Frequently Asked Questions
Q: How many proximity probe channels does the 3300/20-13-03-01-00-00 monitor support?
A: The module supports two independent proximity probe input channels for measuring axial shaft thrust position.
Q: Does the 3300/20 require a separate power supply module?
A: No. The monitor receives operating power through the Bently Nevada 3300 Series rack backplane.
Q: What installation factors affect thrust position measurement accuracy?
A: Probe mounting position, target surface condition, cable routing, shielding, and correct gap voltage adjustment directly affect measurement accuracy.
Field Installation Guidelines
Install the 3300/20 module in a compatible Bently Nevada 3300 Series rack slot and verify the backplane connection before system startup.
Route proximity probe cables separately from high-voltage power wiring to reduce electrical interference. Connect cable shields according to the machine grounding practice and avoid multiple ground points that may create unwanted current loops.
Before operation, confirm the proximity probe gap voltage, mechanical probe alignment, and channel polarity. Verify that the probe output corresponds with the expected rotor axial movement direction.
Perform functional testing of Alert and Danger relay settings after installation. Confirm that alarm actions match the configured machinery protection logic.
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