Product Introduction: Compact Machinery Vibration Monitoring Device
The Bently Nevada 990-08-50-01-05 990 Vibration Transmitter is a two-wire, loop-powered vibration monitoring device designed to provide a simple and reliable vibration signal interface for industrial rotating equipment. Developed primarily for OEM machinery manufacturers and operators of centrifugal compressors, small pumps, motors, and fans, the transmitter converts proximity probe vibration measurements into a standard 4–20 mA proportional output for direct connection to PLC, DCS, SCADA, and machinery control systems.
The 990-08-50-01-05 integrates a Proximitor® sensor within the transmitter assembly, eliminating the need for a separate signal conditioning module. This compact architecture simplifies installation while maintaining accurate peak-to-peak vibration measurement performance. The model features an 8 mils peak-to-peak measurement range, 5-meter transducer system length, DIN rail mounting, and multiple hazardous-area approvals, making it suitable for demanding industrial environments.
Designed for efficient machinery health monitoring, this transmitter provides maintenance teams with a practical solution for vibration trending, early fault detection, and integration into existing automation systems.
Technical Specifications: Engineering Data and Product Details
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 990-08-50-01-05 |
| Product Type | 990 Vibration Transmitter |
| Measurement Range | 0–8 mils peak-to-peak (0–200 μm pp) |
| Input Sensor | 3300 NSv Non-contacting Proximity Probe |
| Transducer System Length | 5.0 m (16.4 ft) |
| Output Signal | 4–20 mA proportional vibration output |
| Power Supply | +12 to +35 VDC |
| Loop Configuration | Two-wire loop powered |
| Mounting Type | 35 mm DIN rail clips |
| Frequency Response | 5 Hz to 6 kHz |
| Loop Accuracy | ±1.5% over specified full-scale range |
| Maximum Loop Resistance | 1,000 Ω at 35 VDC |
| Current Limiting | Approximately 23 mA |
| Diagnostic Output | PROX OUT and COM terminals |
| Signal Conditioning | Integrated Proximitor® electronics |
| Operating Temperature | -35°C to +85°C |
| Storage Temperature | -52°C to +100°C |
| Humidity Rating | Up to 100% condensing (non-submerged) |
| Dimensions | Approx. 100 mm × 73 mm × 51 mm |
| Weight | Approx. 0.43 kg |
Industrial Applications: Designed for Rotating Equipment Monitoring
The 990-08-50-01-05 vibration transmitter is optimized for applications requiring a straightforward vibration measurement signal without the complexity of a full machinery protection rack system.
| Industry | Typical Equipment |
|---|
| Oil & Gas | Centrifugal compressors, process pumps |
| Petrochemical | Rotating process equipment |
| Power Generation | Auxiliary machinery, small turbines |
| Manufacturing | Motors, fans, blowers, gearboxes |
| Water Treatment | Pump systems |
| OEM Machinery | Compressor packages and skid equipment |
Typical applications include:
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Shaft vibration monitoring
-
Machinery condition assessment
-
Preventive maintenance programs
-
Vibration alarm monitoring
-
PLC and DCS integration
-
Equipment performance trending
The transmitter is especially effective for smaller rotating machines where operators need a dependable analog vibration signal for control and monitoring purposes.
Product Advantages: Efficient Monitoring With Proven Reliability
Integrated Proximitor® Sensor Technology
The built-in Proximitor® electronics combine sensing signal conditioning and transmitter functions in one compact unit. This reduces wiring requirements, saves panel space, and simplifies machinery monitoring system design.
8 mil Peak-to-Peak Measurement Range
The “-08” configuration provides a full-scale vibration range of 0–8 mils pp (0–200 μm pp), making it suitable for applications requiring a broader vibration measurement range than standard 5 mil configurations.
5-Meter Transducer System Flexibility
The “-50” option identifies a 5-meter transducer system length, providing a practical installation distance between the proximity probe and transmitter while maintaining measurement accuracy.
DIN Rail Mounting Convenience
The “-01” mounting option provides 35 mm DIN rail installation capability, allowing quick installation inside control cabinets, OEM panels, and machinery monitoring enclosures.
Standard 4–20 mA Output Integration
The transmitter provides an industry-standard analog output signal, allowing easy connection with industrial automation systems without additional signal conversion hardware.
Diagnostic Signal Access
Dedicated PROX OUT and COM terminals provide access to dynamic vibration and gap voltage signals, supporting commissioning, troubleshooting, and maintenance verification.
Industrial Environmental Protection
The transmitter uses rugged potted construction designed for industrial environments with high humidity, vibration exposure, and temperature variation.
Technical FAQs
1. What is the Bently Nevada 990-08-50-01-05 used for?
It is used for continuous vibration monitoring of rotating machinery by converting proximity probe measurements into a 4–20 mA output signal.
2. Which probe is compatible with this transmitter?
The transmitter is designed to operate with a Bently Nevada 3300 NSv proximity probe and matching extension cable system.
3. What does “08” indicate in the model number?
The “08” indicates an 8 mils peak-to-peak (200 μm pp) vibration measurement range.
4. What does “50” represent?
The “50” identifies the 5-meter (16.4 ft) transducer system length.
5. What does the “01” mounting option mean?
The “01” configuration provides 35 mm DIN rail mounting clips.
6. What output signal does the transmitter provide?
It provides a standard 4–20 mA proportional vibration output for PLC, DCS, and SCADA systems.
7. Does this model need an external Proximitor module?
No. The Proximitor® sensor electronics are integrated into the transmitter.
8. What power supply does the unit require?
The transmitter requires a +12 to +35 VDC loop-powered supply.
9. What diagnostic outputs are available?
The unit provides PROX OUT and COM terminals for vibration waveform and gap voltage diagnostics.
10. What machines commonly use this transmitter?
Typical applications include compressors, pumps, motors, fans, blowers, and other industrial rotating machinery.
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