Advanced Machinery Monitoring Solution Overview
The Bently Nevada 990-05-70-02-05 990 Vibration Transmitter is a compact, two-wire loop-powered vibration monitoring device designed to deliver dependable vibration measurement for industrial rotating equipment. Engineered for OEM machinery builders and plant operators, this transmitter converts signals from a compatible 3300 NSv proximity probe system into a standard 4–20 mA output, providing a simple and effective interface with PLC, DCS, SCADA, and machinery control systems.
Featuring an integrated Proximitor® sensor, the 990 transmitter eliminates the need for an external signal conditioning module while maintaining accurate peak-to-peak vibration measurement performance. The 7-meter transducer system configuration and bulkhead mounting design make the 990-05-70-02-05 especially suitable for installations requiring flexible sensor placement and robust field mounting.
Built for industrial reliability, this transmitter provides a practical vibration monitoring solution for compressors, pumps, motors, fans, and other rotating assets where continuous vibration trending and early fault detection are important.
Technical Specifications
| Parameter | Description |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 990-05-70-02-05 |
| Product Type | 990 Vibration Transmitter |
| Input Sensor | 3300 NSv Non-contacting Proximity Probe |
| Measurement Range | 0–5 mils pp (0–125 μm pp) |
| Output Signal | 4–20 mA proportional vibration output |
| System Length | 7.0 m (23 ft) transducer system |
| Mounting Configuration | Bulkhead mounting screws |
| Power Supply | +12 to +35 VDC loop powered |
| Loop Configuration | Two-wire transmitter design |
| Frequency Response | 5 Hz to 6 kHz |
| Diagnostic Output | PROX OUT and COM terminals |
| Signal Conditioning | Integrated Proximitor® electronics |
| Operating Temperature | -35°C to +85°C |
| Storage Temperature | -51°C to +100°C |
| Environmental Protection | Potted construction for industrial environments |
| Dimensions | Approx. 76 mm × 102 mm × 51 mm |
| Weight | Approx. 0.43 kg (shipping weight approximately 1.5 kg) |
Typical Industrial Applications
The 990-05-70-02-05 vibration transmitter is designed for applications where reliable vibration feedback is required without the complexity of a full machinery protection rack system.
| Industry | Typical Equipment |
|---|
| Oil & Gas | Centrifugal compressors, process pumps |
| Power Generation | Turbines, auxiliary rotating equipment |
| Petrochemical | Chemical process machinery |
| Manufacturing | Motors, blowers, fans, gearboxes |
| Water Treatment | Large pump systems |
| OEM Machinery | Compressor and pump packages |
Common monitoring applications include:
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Shaft vibration trending
-
Machinery condition monitoring
-
Preventive maintenance programs
-
Equipment health assessment
-
PLC/DCS vibration alarm input
The transmitter is particularly valuable for smaller rotating machinery packages where a simple 4–20 mA vibration signal is preferred over a complete vibration monitoring rack.
Key Benefits and Performance Highlights
Integrated Proximitor® Electronics
The built-in Proximitor® sensor simplifies system architecture by combining signal conditioning and vibration conversion in one compact device. This reduces installation requirements and improves overall system efficiency.
Extended 7-Meter Transducer System
The 70 system length option supports a 7-meter probe and extension cable arrangement, providing greater flexibility when the sensor location is separated from the control panel or junction area.
Reliable 4–20 mA Output
The industry-standard current output allows direct connection to automation systems, enabling operators to monitor vibration levels through existing plant control infrastructure.
Flexible Bulkhead Installation
The 02 mounting option provides bulkhead screw mounting, allowing secure installation on equipment panels, machinery housings, and custom mounting structures.
Built-In Diagnostic Capability
The transmitter includes PROX OUT and COM diagnostic terminals, allowing technicians to access vibration and gap voltage signals during commissioning, troubleshooting, and maintenance activities.
Hazardous Environment Compatibility
The 05 approval option supports multiple industrial certification requirements, making the transmitter suitable for appropriately classified hazardous-area installations when installed according to applicable requirements.
Technical FAQs
1. What is the Bently Nevada 990-05-70-02-05 used for?
The transmitter is used for continuous vibration monitoring of rotating machinery by converting proximity probe signals into a proportional 4–20 mA output.
2. Which probe is compatible with this transmitter?
The unit is designed to operate with a Bently Nevada 3300 NSv proximity probe and matching extension cable.
3. What does “05” indicate in the model number?
The “05” represents the full-scale vibration measurement range of 0–5 mils peak-to-peak (0–125 μm pp).
4. What does “70” mean in the configuration?
The “70” identifies the 7.0-meter (23 ft) transducer system length.
5. What does “02” represent?
The “02” mounting option specifies bulkhead mounting screws for direct mechanical installation.
6. What output signal does the transmitter provide?
It provides a standard 4–20 mA proportional vibration output for PLC, DCS, and SCADA integration.
7. Does this model require an external Proximitor module?
No. The transmitter includes integrated Proximitor® electronics, reducing additional hardware requirements.
8. What power supply is required?
The transmitter operates from a +12 to +35 VDC loop-powered supply.
9. What diagnostic functions are available?
The unit provides PROX OUT and COM connections for vibration waveform and gap voltage diagnostic measurements.
10. What machines commonly use this transmitter?
Typical installations include compressors, pumps, motors, fans, blowers, and other industrial rotating equipment.
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