Product Overview
Reliable Continuous Vibration Monitoring
The 990-05-50-01-01 accepts input from a compatible 3300 NSv proximity probe and matching extension cable, converts shaft vibration into engineering units, and provides a proportional 4–20 mA output for continuous machine health monitoring.
In addition to the process output, the transmitter provides a PROX OUT diagnostic signal for waveform analysis, gap voltage verification, and troubleshooting. The built-in Not OK/Signal Defeat circuit helps prevent false alarms caused by probe failures or loose connections.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 990-05-50-01-01 |
| Product Type | 990 Vibration Transmitter |
| Full-Scale Range | 0–5 mils pp (0–125 μm pp) |
| Output Signal | 4–20 mA, Two-Wire Loop Powered |
| Compatible Probe | 3300 NSv Proximity Probe |
| System Length | 5.0 m (16.4 ft) |
| Mounting Option | 35 mm DIN Rail Clips |
| Agency Approval | Option 01 (Certified Approval Configuration) |
| Frequency Response | 5 Hz to 6 kHz |
| Supply Voltage | +12 to +35 VDC |
| Diagnostic Output | PROX OUT Dynamic Signal |
| Operating Temperature | -35°C to +85°C |
| Construction | Fully Potted Industrial Electronics |
| Approximate Weight | 0.43 kg |
Typical Applications
The 990-05-50-01-01 is widely used for continuous vibration monitoring of:
| Industry | Typical Equipment |
|---|
| Oil & Gas | Centrifugal compressors, process pumps |
| Power Generation | Steam turbines, generators |
| Petrochemical | Compressors, motors |
| Manufacturing | Fans, blowers, gearboxes |
| Water & Wastewater | Pumping systems |
| OEM Equipment | Packaged rotating machinery |
Typical monitoring functions include:
-
Shaft vibration monitoring
-
Machinery condition monitoring
-
Predictive maintenance
-
Continuous equipment health monitoring
-
PLC/DCS integration
-
Alarm and shutdown systems
Key Features & Benefits
Integrated Proximitor® Electronics
Built-in signal conditioning eliminates the need for an external Proximitor® module, reducing installation complexity and cabinet space requirements.
0–5 mils Measurement Range
This model measures vibration over a 0–5 mils peak-to-peak (0–125 μm pp) range, making it suitable for machinery requiring a wider monitoring span than the 0–4 mil configuration.
Standard 4–20 mA Output
The industry-standard analog output integrates directly with PLC, DCS, SCADA, and other industrial automation systems.
Built-In Diagnostic Output
The PROX OUT connection provides raw vibration and gap voltage signals for commissioning, calibration, and maintenance diagnostics.
Rugged Industrial Construction
Fully encapsulated electronics provide excellent resistance to vibration, moisture, and harsh industrial environments, supporting long-term reliability.
Frequently Asked Questions
1. What is the Bently Nevada 990-05-50-01-01 used for?
It converts shaft vibration from a compatible proximity probe into a 4–20 mA signal for machinery monitoring and protection.
2. What does the "05" option indicate?
It specifies a 0–5 mils peak-to-peak (0–125 μm pp) vibration measurement range.
3. What does the "50" option represent?
It identifies compatibility with a 5-meter transducer system, including the 3300 NSv probe and extension cable.
4. What does the first "01" option specify?
It indicates 35 mm DIN rail mounting for installation inside industrial control cabinets.
5. What does the final "01" represent?
It designates the Agency Approval Option 01, identifying a certified configuration for applicable installations. Specific certifications depend on the product documentation and regional approvals.
6. Which probe is compatible?
The transmitter is designed for use with a Bently Nevada 3300 NSv proximity probe and its matching extension cable.
7. What power supply is required?
The transmitter operates from a +12 to +35 VDC two-wire loop-powered supply.
8. Can it connect directly to a PLC or DCS?
Yes. The 4–20 mA output is intended for direct connection to industrial automation systems.
9. Does it provide a diagnostic output?
Yes. The PROX OUT terminal provides dynamic vibration and gap voltage signals for diagnostics and waveform analysis.
10. Which machines commonly use this transmitter?
It is commonly installed on centrifugal compressors, pumps, motors, fans, and other rotating machinery requiring continuous vibration monitoring.
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