Bently Nevada 3300/20-12-01 Dual Thrust Position Monitor
Bently Nevada 3300/20-12-01 Dual Thrust Position Monitor
Configured for dual-channel thrust displacement monitoring in the 3300 machinery protection system, the Bently Nevada 3300/20-12-01 (3300/20 Dual Thrust Position Monitor) provides direct axial shaft position measurement and alarm execution.
Suffix Breakdown & Model Matrix
- Range Option (-12): Configured for ±50 mils (±1.27 mm) axial displacement, scaled at 200 mV/mil (7.87 V/mm).
- Transducer Option (-01): Compatible with 3300 and 7200 series 5 mm/8 mm Proximitor sensor systems.
- Rack Slot Requirements: Occupies two slots in the 3300 monitor rack.
- Outputs: Provides 4-20 mA or 1-5 VDC recorder outputs per channel.
- Alarm Functions: Adjustable alert/danger thresholds with relay logic for "OK", "Alert", and "Danger".
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 3300/20-12-01 |
| Brand | Bently Nevada |
| Origin | USA |
| Weight | Not specified |
| Dimensions | Rack slot module, dual-width |
| Operating Temp | Standard 3300 system range (industrial ambient) |
| Power Consumption | Low-voltage rack supply |
| Core Performance | Dual-channel thrust position monitoring, ±50 mils range, 200 mV/mil scaling |
Eddy-Current Probe Scaling and Gap Voltage Validation
The monitor applies linear scale factors aligned with Bently Nevada proximity probes, ensuring accurate conversion of eddy-current signals into axial displacement values. Gap voltage validation is performed against -10 VDC reference targets, confirming probe installation integrity and signal conditioning stability. This mechanism supports rotor dynamics analysis and suppresses cross-talk between dual channels.
Frequently Asked Questions
Q: Does the 3300/20-12-01 support hot-swap installation? A: No, modules require rack power-down before insertion or removal to prevent backplane signal disruption.
Q: What is the expected backplane current load for this monitor? A: It draws standard low-voltage rack supply current; exact values depend on rack configuration but remain within 3300 system design limits.
Q: How are alarm relay transitions handled under redundant rack configurations? A: Relay logic executes with minimal delay, typically within mechanical relay switching time, ensuring deterministic alert/danger signaling.
Field Installation Guidelines
- Ensure proximity probe cabling is shielded and properly grounded at the rack end to minimize induced noise.
- Maintain probe gap voltage near -10 VDC during installation for valid displacement scaling.
- Route dual-channel inputs separately to reduce cross-talk and maintain rotor dynamics fidelity.
- Secure module into designated dual-width rack slots; verify backplane connectors are fully engaged.
- Configure alert and danger setpoints via rack interface before commissioning.
Bently Nevada 3300/20-12-01 Dual Thrust Position Monitor
