Bently Nevada 990-04-50-02-00 Vibration Transmitter
A two-wire 4–20 mA transmitter for a 0–4 mil pp range and 5 m proximity system.
Product Profile
990-04-50-02-00 is a Bently Nevada 990 Vibration Transmitter. The ordering string identifies a 0–4 mils peak-to-peak range and 5.0 m system length for a compatible 3300 NSv probe and extension cable.
The transmitter accepts one non-contacting proximity system and provides loop-powered 4–20 mA plus Prox Out. Probe, cable, transmitter and DCS loop form one measurement path.
Technical Data
| Manufacturer | Bently Nevada |
|---|---|
| Exact Model | 990-04-50-02-00 |
| Family | 990 Vibration Transmitter |
| Full-Scale Range | 0–4 mils pp / 0–100 µm pp |
| System Length | 5.0 m / 16.4 ft |
| Sensor Input | One compatible 3300 NSv probe and extension cable |
| Power Input | 12–35 VDC |
| Signal Output | 4–20 mADC, two-wire |
| Frequency Response | 5 Hz to 6,000 Hz, +0/−3 dB |
| Prox Out Linear Range | 1.4 mm / 55 mils |
| Minimum Target | 9.5 mm / 0.375 in diameter |
System Role
Converts relative shaft vibration into a standard 4–20 mA signal.
Provides buffered Prox Out for waveform and diagnostics.
Integrates vibration data into a DCS or PLC without a rack monitor.
Keeps range and system length explicit in the order code.
Compatibility
- Use a compatible 5 m 3300 NSv probe/cable system.
- Match 0–4 mil scaling to DCS range and alarm settings.
- Check loop voltage, resistance, shield and hazardous-area method.
- Commission loop current, static gap, Prox Out waveform and alarms.
Applications
- Radial shaft vibration on pumps, compressors and fans.
- DCS or PLC vibration trending through 4–20 mA.
- OEM machinery packages needing a compact transmitter.
FAQ
Which loop records should accompany a 990-04-50-02-00 enquiry?
Provide probe/cable codes, system length, DCS range, supply, resistance and alarms.
Can 990-04-50-02-00 use an 8 m or 9 m probe system?
Do not assume so; this code is tied to the documented 5.0 m execution.
Why check DCS scaling before replacing 990-04-50-02-00?
The 0–4 mil range must match channel scaling and alarm setpoints.
What mechanical evidence helps validate 990-04-50-02-00?
Provide probe mounting, target, cable route, initial gap and Prox Out voltage.
How should replacement 990-04-50-02-00 be commissioned?
Verify loop current, gap, waveform, vibration response, scaling and alarms.
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