Product Overview
The Bently Nevada 990-08-50-03-01 is a precision 990 Vibration Transmitter designed for continuous vibration monitoring in industrial environments. This Industrial Automation Module accepts one non-contacting 3300 NSv Proximity Probe and extension cable to provide a 4-20 mA output proportional to vibration displacement. Its robust design and CSA Division 2 certification make it suitable for hazardous areas.
Technical Specifications
| Parameter |
Value |
| Full-scale Option |
0-8 mils pp (0-200 µm pp) |
| System Length Option |
5.0 meters (16.4 feet) |
| Mounting Option |
03 DIN clips and screws |
| Agency Approval Option |
01 CSA Division 2 |
| Input |
Accepts 1 non-contacting 3300 NSv Proximity Probe and extension cable |
| Power |
+12 to +35 Vdc input at transmitter terminal |
| Maximum Loop Resistance |
1,000 Ω including cable at 35 Vdc |
| Current Limiting |
23 mA typical |
| Weight |
0.43 kg (0.9 lbm) |
| 4 to 20 mA Signal Output |
Over specified full-scale range in 2-wire configuration |
| 4 to 20 mA Loop Accuracy |
Within ±1.5% over full-scale range (additional to Prox Out Scale Factor) |
| Probe Gap |
0.5 – 1.75 mm (20 – 55 mils) from target |
| Frequency Response |
5 Hz to 6,000 Hz +0, -3 dB |
| Minimum Target Size |
9.5 mm (0.375 in) diameter |
| Leadwire Length |
Maximum 3 meters (10 feet) for Proximitor Output |
| NOT OK/Signal Defeat |
Output < 3.6 mA within 100 µs; restores 2-3 seconds |
Real-World Applications
The 990-08-50-03-01 excels in monitoring shaft vibration in turbines, compressors, and pumps. By providing a proportional 4-20 mA signal, it integrates easily into PLC and DCS systems for predictive maintenance. Its fast response to NOT OK conditions prevents catastrophic failures, reducing downtime and repair costs.
Installation Guidance
Mount the transmitter using DIN clips and screws (option 03). Ensure the probe gap is set between 0.5 and 1.75 mm from the target. Use a 3300 NSv probe and extension cable, with maximum leadwire length of 3 meters for the Proximitor output. Power with +12 to +35 Vdc at the transmitter terminal. Non-interacting zero and span adjustments simplify calibration.
Maintenance & Reliability
The Bently Nevada 990-08-50-03-01 requires minimal maintenance. Routine checks include verifying loop resistance below 1,000 Ω and inspecting probe gap. Its current limiting at 23 mA protects against overcurrent. The transmitter's rugged construction ensures long service life in harsh environments, providing excellent return on investment through reduced unscheduled downtime.
Selection Guide & Purchasing Advice
Before purchasing the 990-08-50-03-01, verify that your system requires a 0-8 mils full-scale range and a 5.0 meter system length. Ensure compatibility with your existing 3300 NSv probe. For inquiries and pricing, contact ubest101, a trusted supplier of industrial automation spares.