Product Introduction: Precision Vibration Signal Conditioning for Rotating Machinery
The Bently Nevada 990-05-XX-01-00 168251-01 990 Vibration Transmitter is a compact, two-wire, loop-powered vibration monitoring device designed for continuous measurement and transmission of rotating equipment vibration data. Built for OEM machinery packages and industrial monitoring applications, this transmitter converts proximity probe vibration signals into a proportional 4–20 mA output, providing a reliable interface with PLC, DCS, SCADA, and plant control systems.
The 990 series transmitter integrates Proximitor® sensor electronics directly into the unit, eliminating the need for a separate external signal conditioner. This integrated architecture reduces installation complexity while providing stable vibration measurement performance for compressors, pumps, motors, fans, and other critical rotating machinery.
The 168251-01 modification identifier represents a specific configured version of the 990-05-XX-01-00 transmitter platform. This model combines a 0–5 mils peak-to-peak vibration range, configurable transducer system length, DIN rail mounting capability, and standard non-hazardous-area configuration for flexible industrial deployment.
Technical Specifications: Engineering Parameters and Product Data
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 990-05-XX-01-00 |
| Modification Number | 168251-01 |
| Product Type | 990 Vibration Transmitter |
| Measurement Range | 0–5 mils pp (0–125 μm pp) |
| Input Signal | Proximity probe vibration signal |
| Compatible Sensor System | 3300 NSv Proximity Probe System |
| Output Signal | 4–20 mA proportional vibration output |
| Power Supply | Two-wire loop powered |
| Operating Voltage | 12–35 VDC |
| System Length Option | XX configurable transducer system |
| Mounting Option | 35 mm DIN rail mounting clips |
| Diagnostic Output | PROX OUT and COM terminals |
| Signal Conditioning | Integrated Proximitor® electronics |
| Frequency Response | 5 Hz to 6 kHz |
| Operating Temperature | -35°C to +85°C |
| Storage Temperature | -51°C to +100°C |
| Construction | Industrial potted electronics |
| Dimensions | Approx. 100 mm × 74 mm × 60 mm |
| Weight | Approx. 0.46 kg |
Industrial Applications: Reliable Monitoring Across Multiple Industries
The Bently Nevada 990-05-XX-01-00 168251-01 provides a practical vibration monitoring solution for applications where operators need dependable machine condition information without installing a full rack-based protection system.
| Industry | Typical Equipment |
|---|
| Oil & Gas | Compressors, pumps, rotating process equipment |
| Power Generation | Turbines, generators, auxiliary machinery |
| Petrochemical | Process pumps, motors, fans |
| Manufacturing | Gearboxes, blowers, production machinery |
| Water Treatment | Large pumping systems |
| OEM Machinery | Compressor and pump skids |
Typical application areas include:
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Continuous vibration monitoring
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Machinery health evaluation
-
Predictive maintenance programs
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Equipment alarm monitoring
-
Remote vibration data transmission
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Control system integration
The transmitter is particularly suited for OEM applications where a simple proportional vibration signal is required for machinery monitoring and protection logic.
Product Advantages: Designed for Efficient Machinery Monitoring
Integrated Proximitor® Technology
The built-in Proximitor® electronics provide signal conditioning and vibration conversion inside one compact transmitter. This reduces additional hardware requirements, simplifies cabinet design, and improves installation efficiency.
Standard 4–20 mA Industrial Output
The transmitter delivers a widely accepted analog current signal that can be directly connected to automation systems. This allows operators to monitor vibration trends through existing PLC and DCS infrastructure without additional signal conversion equipment.
Flexible Transducer System Configuration
The XX system length option allows the transmitter to be matched with the required probe and extension cable arrangement. This flexibility supports different machinery layouts and installation distances.
Compact DIN Rail Installation
The 01 mounting configuration provides 35 mm DIN rail mounting capability, making the transmitter suitable for electrical cabinets, OEM panels, and machinery monitoring enclosures.
Built-In Diagnostic Capability
The PROX OUT and COM terminals provide access to vibration and gap voltage signals, allowing technicians to perform commissioning checks, calibration verification, and troubleshooting without removing the transmitter from service.
Durable Industrial Construction
The rugged potted electronics design improves resistance to vibration, temperature changes, and industrial operating conditions, supporting long-term reliability in demanding environments.
Technical FAQs
1. What is the Bently Nevada 990-05-XX-01-00 168251-01 used for?
It is used for continuous vibration monitoring of rotating machinery by converting proximity probe signals into a proportional 4–20 mA output.
2. What type of sensor connects to this transmitter?
The transmitter is designed for use with compatible Bently Nevada proximity probe systems, including 3300 NSv configurations.
3. What does the “05” represent in the model number?
The “05” indicates a full-scale vibration measurement range of 0–5 mils peak-to-peak (0–125 μm pp).
4. What does the “XX” option mean?
The “XX” indicates the transducer system length configuration, which is selected according to the required probe and extension cable length.
5. What does the “01” mounting option provide?
The “01” option specifies a 35 mm DIN rail mounting configuration.
6. What output signal does this transmitter provide?
It provides a standard 4–20 mA proportional vibration output for industrial control systems.
7. Does the transmitter require a separate Proximitor module?
No. The Proximitor® electronics are integrated into the transmitter assembly.
8. What power supply is required?
The transmitter operates using a two-wire loop-powered supply, typically 12–35 VDC.
9. What diagnostic functions are available?
The transmitter provides PROX OUT and COM terminals for vibration signal access and gap voltage diagnostics.
10. Which machines commonly use this transmitter?
Typical applications include compressors, pumps, motors, fans, blowers, and other rotating industrial equipment.
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