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Two-Channel Axial Position Measurement for Rotating Machinery
The Bently Nevada 3300/20-12-01-02-00-00 dual thrust position monitor continuously tracks axial shaft movement across two independent channels. This module accepts input signals from two 3300 XL 8 mm Proximitor sensors for precise thrust bearing monitoring. The monitor provides essential protection for steam turbines, compressors, and large motor-driven equipment. It measures both static position and dynamic thrust excursions to prevent bearing damage.
Detailed Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | 3300/20-12-01-02-00-00 |
| Brand | Bently Nevada |
| Category | Dual Thrust Position Monitor |
| Channels | 2 independent |
| Input Type | 3300 XL 8 mm Proximitor, 200 mV/mil |
| Scale Factor | 7.87 V/mm |
| Standard Range | -0.100 to -0.016 inch (-2.54 to -0.406 mm) |
| Zero Position | -0.050 inch (-1.27 mm) |
| Input Impedance | 50 kΩ minimum |
| Alarm Relay Option | None configured |
| Display | Non-multiplexing vertical LCD |
| Recorder Outputs | 4-20 mA, 0 to -10 VDC, or +1 to +5 VDC |
| Frequency Response | DC to 10 Hz |
| Accuracy | ±0.33% of full-scale |
| Power Requirement | +24 VDC nominal |
| Power Consumption | 2.0 W maximum |
| Weight | 1.02 kg |
| Dimensions | 192 x 140 x 89 mm |
Measurement and Processing Capabilities
This monitor processes eddy-current probe signals to measure both thrust position and gap voltage. Its precision input stage maintains a calibrated sensitivity of 200 mV/mil for accurate displacement readings. The module offers a standard measurement range from -0.100 to -0.016 inch. This range encompasses typical thrust bearing clearance requirements.
Fault Detection and Output Flexibility
A built-in Not OK circuit actively monitors each transducer channel for wire breaks or impedance faults. The monitor de-energizes the affected channel within 100 milliseconds upon detecting a probe failure. You can field-select recorder output options to match your specific system requirements. This flexibility allows straightforward integration with DCS, PLC, and SCADA platforms.
Safety and Protection Features
The internal design suppresses crosstalk interference from adjacent probes in close proximity. The monitor inhibits alarm actuation during transducer faults to prevent nuisance trips. Front panel indicators provide immediate visual confirmation of channel status. The LCD display shows both position readings and gap voltages clearly.
Installation and Application
This monitor fits standard 3300 series rack systems for seamless integration. Its compact form factor and 1.02 kg weight simplify retrofit and new installations. The module suits steam turbines, gas turbines, and large centrifugal compressors. Operators can field-configure zero position settings to match specific machinery requirements.