Product Introduction
When vibration monitoring systems fail, industrial operations face costly downtime. The Bently Nevada 990-08-50-02-CN Vibration Transmitter provides reliable measurement and fault detection to prevent unexpected failures. This transmitter is part of the 990 series and is designed for continuous monitoring of rotating machinery.
Technical Specifications Breakdown
Key specifications of the Bently Nevada 990-08-50-02-CN Vibration Transmitter include:
| Parameter |
Value |
| Full-scale Option |
08: 0-8 mils pp (0-200 μm pp) |
| System Length Option |
50: 5.0 meters (16.4 feet) |
| Mounting Option |
02: Bulkhead screws |
| Input |
Accepts 1 non-contacting 3300 NSv Proximity Probe |
| Power |
+12 to +35 Vdc |
| Output |
4-20 mAdc over full scale |
| Loop Accuracy |
±1.5% of full scale |
| Maximum Loop Resistance |
1,000 Ω at 35 Vdc |
| Current Limiting |
23 mA typical |
| Frequency Response |
5 Hz to 6,000 Hz +0,3 dB |
| Probe Gap |
0.5 to 1.75 mm (20-55 mils) |
| Minimum Target Size |
9.5 mm (0.375 in) diameter |
| Leadwire Length |
Max 3 meters (10 ft) for BNC output |
| Weight |
0.43 kg (0.9 lb) |
| Hazardous Area |
Non-Hazardous, Zone 2, Div 2 – Power Supply 28 V |
Installation & Setup Guidance
Mount the Bently Nevada 990-08-50-02-CN Vibration Transmitter using the bulkhead screws (Mounting Option 02). Ensure the proximity probe is gapped between 0.5 and 1.75 mm from the target. Connect the 3300 NSv probe and extension cable to the input. The system length option 50 indicates a 5.0-meter cable. Power the unit with +12 to +35 Vdc at the transmitter terminal. The 4-20 mA output loop can include up to 1,000 Ω resistance. The BNC connector for the Proximitor Sensor Output must not exceed 3 meters in cable length.
Maintenance & Reliability
The Bently Nevada 990-08-50-02-CN Vibration Transmitter features a NOT OK/signal defeat function: if a fault occurs, output drops below 3.6 mA within 100 μs, and restores within 2-3 seconds after the fault clears. This provides immediate alarm indication for predictive maintenance. Regular inspection of probe gap and cable connections ensures reliable operation. The transmitter's current limiting (23 mA typical) protects against loop faults.
Troubleshooting & Common Issues
If the output is erratic, verify the probe gap is within 0.5-1.75 mm and the target size meets the minimum 9.5 mm diameter. Check the loop resistance does not exceed 1,000 Ω at 35 Vdc. If the signal goes below 3.6 mA, a Not OK condition exists – inspect probe and wiring. The frequency response of 5 Hz to 6,000 Hz covers typical machine vibrations. Ensure the power supply provides stable +12 to +35 Vdc.
Selection Guide & Purchasing Advice
When selecting the Bently Nevada 990-08-50-02-CN Vibration Transmitter, verify the full-scale option (08: 0-8 mils) and system length (50: 5.0 m) match your application. For reliable supply, consider purchasing from PLC Source PRO (available through ubest101). This transmitter is ideal for continuous vibration monitoring in industrial environments.