Product Introduction
The Bently Nevada 990-05-50-03-01 is a 990 Vibration Transmitter designed for industrial machinery protection. This Industrial Automation Module accepts one non-contacting 3300 NSv Proximity Probe and extension cable, converting shaft vibration into a 4-20 mA signal. It is an ideal drop-in replacement for older vibration monitoring systems, offering enhanced reliability and ease of installation.
Technical Specifications Breakdown
| Parameter |
Value |
| Full-scale Option |
05: 0-5 mils pp (0-125 μm pp) |
| System Length Option |
50: 5.0 meters (16.4 feet) |
| Mounting Option |
03: DIN clips and screws |
| Agency Approval Option |
01: 35 mm DIN rail clips |
| Input |
Accepts 1 non-contacting 3300 NSv Proximity Probe and extension cable |
| Power |
+12 to +35 Vdc at transmitter terminal |
| Maximum Loop Resistance |
1,000 Ω including cable at 35 Vdc |
| Current Limiting |
23 mA typical |
| 4-20 mA Loop Accuracy |
Within ±1.5% over full-scale range |
| 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 Sensor Output (BNC) |
| Weight |
0.43 kg (0.9 lbm) |
These specifications ensure the Bently Nevada 990-05-50-03-01 delivers precise vibration measurement for critical rotating machinery. The ±1.5% loop accuracy is additive to the Prox Out Incremental Scale Factor, providing reliable data for predictive maintenance.
Applications
This 990 Vibration Transmitter is ideal for upgrading legacy vibration monitoring systems in turbines, compressors, pumps, and motors. It directly replaces older Bently Nevada transmitters without requiring wiring changes, thanks to its 2-wire 4-20 mA configuration. Use it in non-hazardous, Zone 2, or Div 2 hazardous areas with a 28 V power supply. The small form factor and DIN rail mounting simplify installation in crowded panels.
Installation & Setup Guidance
Mount the Bently Nevada 990-05-50-03-01 using the included DIN clips and screws (Mounting Option 03). Ensure the 3300 NSv probe is gapped between 0.5 and 1.75 mm from the target surface. Connect the probe and extension cable to the transmitter input. Apply +12 to +35 Vdc power at the transmitter terminal. The 4-20 mA output connects in series with a loop resistance up to 1,000 Ω. Adjust zero and span using non-interacting external trimmers. Verify the probe gap and full-scale range before commissioning.
Maintenance & Reliability
The Bently Nevada 990-05-50-03-01 requires minimal maintenance. Periodically check the probe gap and cable connections. The current limiting (23 mA typical) protects against loop faults. The NOT OK signal defeat forces output below 3.6 mA within 100 μs of a fault, with automatic recovery in 2-3 seconds. This ensures fail-safe operation. For long-term reliability, keep the transmitter in a clean, dry environment within its specified temperature range (not explicitly stated, but typical for industrial modules).
Selection Guide & Purchasing Advice
When replacing an existing vibration transmitter, verify the full-scale range (Option 05: 0-5 mils pp) matches your application. The system length option (50: 5.0 meters) determines cable length. Ensure your probe is a 3300 NSv series. For expert advice on compatibility or to place an order, contact ubest101, a trusted supplier of industrial automation spares. The Bently Nevada 990-05-50-03-01 offers a cost-effective upgrade path for critical machinery protection.