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Bently Nevada 3300/20-12-01-02-03-02 3300 Series Dual Thrust Position Monitor
Purchase authentic Bently Nevada 3300/20-12-01-02-03-02 Dual Thrust Position Monitors. Brand New in original factory packaging with Original Stock and Global Shipping.
Description
The Bently Nevada 3300/20-12-01-02-03-02, also cataloged as the 3300/20 Dual Thrust Position Monitors, operates as a dedicated hardware component for axial shaft position measurement and thrust bearing protection within 3300 Series machinery protection racks.
Suffix Breakdown & Model Matrix
| Option | Specification |
|---|---|
| 3300/20 | Base model: Dual Thrust Position Monitor |
| -12 | Full-Scale Range Option: 1.0-0-1.0 mm |
| -01 | Transducer Input Option: 3300 or 7200 Proximitor systems (200 mV/mil) |
| -02 | Alarm Relay Option: Hermetically-sealed relays |
| -03 | Agency Approval Option: ATEX self certification (Requires weatherproof housing) |
| -02 | Safety Barrier Option: Internal safety barriers |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 3300/20-12-01-02-03-02 |
| Brand | Bently Nevada |
| Origin | USA |
| Weight | 1.2 kg |
| Dimensions | Standard 3300 Rack Module Slot (Full-Height) |
| Operating Temp | 0 deg C to +65 deg C |
| Power Consumption | 1.0 W typical (Backplane bus draw) |
| Product Type | Dual Thrust Position Monitors |
| Input Channel Count | 2 independent channels (Proximitor sensor inputs) |
| Full-Scale Range | 1.0-0-1.0 mm |
| Input Sensitivity | 200 mV/mil (7.87 V/mm) |
| Relay Configuration | Hermetically-sealed alarm relays |
| Alarm Logic Schemes | Configurable AND (2-out-of-2) or OR (1-out-of-1) voting logic |
| Safety Barrier Option | Internal safety barriers included |
Gap Voltage Validation and Rotor Dynamics
The Bently Nevada 3300/20-12-01-02-03-02 processes continuous DC gap voltage inputs from two independent axial proximity probes observing the shaft thrust collar. Proper gap voltage validation ensures that the static transducer bias matches the physical midpoint of the thrust bearing clearance. By implementing 2-out-of-2 (AND) voting logic across both input channels, the module separates genuine axial shaft movement from individual sensor faults, preventing false trips while maintaining precise tracking of rotor dynamics.
Frequently Asked Questions
Q: Why is 2-out-of-2 (AND) voting logic recommended for thrust position applications?
A: Because thrust position is calculated directly from proximity probe DC gap voltage, a single transducer failure (gap out of range) could be interpreted as shaft movement. AND voting requires both channels to exceed setpoints simultaneously before actuating alarm relays.
Q: How does the internal safety barrier option (-02) affect field transducer connections?
A: Internal barriers limit electrical energy delivered to field wiring, allowing direct connection to Proximitor sensors located in hazardous areas without requiring external galvano-isolated barrier housings.
Field Installation Guidelines
- First, insert the 3300/20-12-01-02-03-02 module into its assigned slot in the 3300 rack backplane and tighten the securing screws.
- Next, connect the proximity transducer lead wires to the rear terminal block, ensuring correct polarity for channel 1 and channel 2.
- Additionally, ground all field cable shields at the designated rack earth grounding bus to prevent electrical noise interference.
- Finally, apply rack power, perform probe gap adjustment using a digital voltmeter at the front panel coaxial test points, and verify alarm voting configuration.
Additional information
| Weight | 1.20 kg |
|---|---|
| Dimensions | 45 × 95 × 61 mm |
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