Intelligent Vibration Monitoring Transmitter for Industrial Machinery
The Bently Nevada 990-05-70-03-05 990 Vibration Transmitter is a compact, two-wire, loop-powered vibration monitoring device designed to provide reliable machinery condition feedback for rotating equipment applications. Developed for OEM machinery builders and industrial operators, this transmitter converts vibration signals from a compatible 3300 NSv proximity probe system into a standard 4–20 mA output, allowing direct connection to PLC, DCS, SCADA, and machinery control systems.
With an integrated Proximitor® sensor design, the 990-05-70-03-05 simplifies system architecture by combining signal conditioning and vibration conversion into one compact unit. The 7-meter transducer system configuration, flexible mounting arrangement, and hazardous-area approval options make it a practical solution for compressors, pumps, motors, fans, and other rotating assets requiring continuous vibration monitoring.
Designed for straightforward installation and dependable operation, this transmitter provides plant engineers with an efficient method for adding vibration measurement capability to machinery control systems while supporting predictive maintenance strategies.
Technical Specifications
| Parameter | Description |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 990-05-70-03-05 |
| Product Type | 990 Vibration Transmitter |
| Input Sensor | 3300 NSv Non-contacting Proximity Probe |
| Measurement Range | 0–5 mils peak-to-peak (0–125 μm pp) |
| Output Signal | 4–20 mA proportional vibration signal |
| System Length | 7.0 m (23 ft) transducer system |
| Mounting Type | DIN rail clips and mounting screws |
| Power Supply | +12 to +35 VDC |
| Loop Configuration | Two-wire loop powered |
| Loop Accuracy | ±1.5% of full-scale range |
| Frequency Response | 5 Hz to 6 kHz |
| Probe Gap Range | 0.5 to 1.75 mm (20 to 55 mils) |
| Maximum Loop Resistance | 1,000 Ω at 35 VDC |
| Diagnostic Output | PROX OUT and COM terminals |
| Current Limiting | Approximately 23 mA |
| Operating Temperature | -35°C to +85°C |
| Construction | Industrial potted electronics |
| Dimensions | Approx. 100 mm × 74 mm × 53 mm |
| Weight | Approx. 0.43 kg |
Industrial Applications
The 990-05-70-03-05 Vibration Transmitter is optimized for applications where reliable vibration data is required without the complexity of a full machinery protection rack.
| Industry | Typical Equipment |
|---|
| Oil & Gas | Centrifugal compressors, process pumps |
| Power Generation | Turbines, auxiliary machinery |
| Petrochemical | Rotating process equipment |
| Manufacturing | Motors, blowers, fans, gear drives |
| Water Treatment | Large pump systems |
| OEM Machinery | Compressor packages and skid systems |
Common applications include:
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Continuous vibration monitoring
-
Machinery health assessment
-
Predictive maintenance programs
-
Equipment protection alarms
-
PLC and DCS vibration input monitoring
The transmitter is particularly suitable for OEM applications involving centrifugal air compressors, small pumps, motors, and fans where a simple proportional vibration output is required.
Product Advantages and Performance Highlights
Integrated Proximitor® Electronics
The built-in Proximitor® technology removes the requirement for a separate signal conditioning module. This integrated approach reduces panel space requirements, simplifies wiring, and improves overall installation efficiency.
Extended 7-Meter Measurement System
The 70 option provides compatibility with a 7-meter probe and extension cable arrangement, offering greater flexibility when machinery sensors are installed away from monitoring cabinets or control panels.
Flexible Mounting Configuration
The 03 mounting option combines DIN rail clips and mounting screws, allowing installation flexibility for different cabinet layouts and equipment configurations. This makes the transmitter suitable for both OEM packages and retrofit projects.
Standard 4–20 mA Industrial Output
The transmitter provides an industry-standard analog signal that integrates easily with existing automation infrastructure, enabling operators to monitor vibration levels through conventional control systems.
Built-In Diagnostic Functions
The PROX OUT and COM terminals provide access to dynamic vibration signals and gap voltage information, supporting commissioning, calibration, and troubleshooting activities.
Reliable Hazardous-Area Performance
The 05 approval option supports applications requiring recognized industrial certifications, including hazardous-area installations when applied according to site requirements.
Technical FAQs
1. What is the Bently Nevada 990-05-70-03-05 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 sensor works with this vibration transmitter?
The transmitter is designed to operate with a Bently Nevada 3300 NSv proximity probe and matching extension cable.
3. What does “05” mean in the model number?
The “05” identifies the transmitter’s full-scale measurement range of 0–5 mils peak-to-peak (0–125 μm pp).
4. What does “70” represent?
The “70” indicates a 7.0-meter transducer system length.
5. What does the “03” mounting option provide?
The “03” option includes both DIN rail clips and mounting screws for flexible installation.
6. What output does this transmitter provide?
It provides a standard 4–20 mA proportional vibration output for PLC, DCS, and SCADA systems.
7. Does the unit require an external Proximitor module?
No. The transmitter includes integrated Proximitor® electronics.
8. What power supply is required?
The transmitter requires a +12 to +35 VDC loop-powered supply.
9. What diagnostic features are available?
The unit provides PROX OUT and COM connections for vibration signal analysis and gap voltage checking.
10. What machines commonly use this transmitter?
It is commonly installed on compressors, pumps, motors, fans, blowers, and other rotating industrial machinery.
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