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Product Overview
The Bently Nevada 990-04-XX-01 Vibration Transmitter is a compact, rugged, and cost-effective vibration monitoring solution designed to convert dynamic signals from accelerometers or velocity sensors into a standard 4–20 mA output for integration with plant control systems such as DCS, PLCs, or SCADA. It provides continuous monitoring of machine vibration levels, allowing maintenance teams to detect early signs of mechanical issues such as imbalance, misalignment, or bearing wear.
This transmitter is ideal for applications where full protection systems are not justified, yet vibration trending and alerting are critical. With its industry-standard interface and high reliability, the 990 transmitter enhances predictive maintenance strategies and helps reduce unplanned outages.
Key Features
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Converts raw vibration signals into industry-standard 4–20 mA output
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Supports both velocity and acceleration sensor inputs
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Scalable output range based on vibration measurement (e.g., 0–1 in/s or 0–10 mm/s)
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Compact and rugged housing for harsh industrial environments
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Easy integration with PLCs, DCS, SCADA, or chart recorders
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Loop-powered 2-wire design simplifies installation
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LED indicators for status and fault diagnostics
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Factory-calibrated to user-specified vibration ranges
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Field-mountable near the machine or sensor
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Cost-effective monitoring for non-critical rotating assets
Technical Specifications
| Specification | Details |
|---|---|
| Product Name | Bently Nevada 990 Vibration Transmitter |
| Model Number | 990-04-XX-01 |
| Signal Input | Accelerometer or velocity sensor (IEPE type) |
| Signal Output | 4–20 mA current loop |
| Measurement Range | Configurable (e.g., 0–1 in/s, 0–25 mm/s) |
| Frequency Response | 10 Hz to 1 kHz (typical, depending on configuration) |
| Output Accuracy | ±1% of full-scale output |
| Power Supply | 12–30 VDC loop-powered |
| Electrical Isolation | Input to output isolation provided |
| Housing Material | Stainless steel or anodized aluminum (based on model) |
| Enclosure Rating | IP65 / NEMA 4X |
| Operating Temperature Range | -40°C to +85°C |
| Storage Temperature Range | -50°C to +100°C |
| Certifications | CE, RoHS, ATEX/IECEx options available |
| Dimensions | 100.1 x 73.9 x 53.3mm |
| Weight | 0.43 kg |
Industry Applications
The Bently Nevada 990 Vibration Transmitter is widely deployed for monitoring rotating and reciprocating equipment in various industries:
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Oil & Gas: Pumps, motors, and fans in upstream and downstream applications
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Power Generation: Auxiliary equipment like cooling fans, feedwater pumps, and ID/FD fans
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Water & Wastewater: Blowers, aeration fans, and lift station motors
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HVAC Systems: Fans, chillers, and compressors for facility monitoring
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Mining & Metals: Crushers, conveyors, and vibrating screens
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Pulp & Paper: Presses, refiners, and rotating dryers
Product Advantages
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Reliable Vibration Monitoring: Converts raw vibration data into actionable analog output
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Easy System Integration: Compatible with most industrial control and automation platforms
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Compact and Durable: Built for long-term operation in harsh and confined environments
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Low Installation Cost: Loop-powered design minimizes wiring and installation effort
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Customizable Measurement Ranges: Factory-calibrated for specific machinery requirements
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Predictive Maintenance Ready: Enables early fault detection and reduced maintenance costs
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LED Diagnostic Feedback: Simplifies troubleshooting in the field
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Wide Industry Use: Ideal for applications where full protection systems are not practical
Frequently Asked Questions (FAQ)
1. What type of sensors can be used with the 990-04-XX-01?
It accepts input from IEPE-type accelerometers or velocity sensors.
2. What does the “4–20 mA” output represent?
It represents the measured vibration level scaled between a configured range (e.g., 0–10 mm/s = 4–20 mA).
3. Is the module loop-powered?
Yes, it is a 2-wire loop-powered device requiring only power and signal wires.
4. Can this transmitter be installed outdoors?
Yes, it is housed in a weather-resistant enclosure rated IP65/NEMA 4X.
5. What kind of machinery can it monitor?
Pumps, fans, motors, compressors, blowers, conveyors, and other rotating equipment.
6. Does it require regular calibration?
Factory calibration is stable; periodic validation is recommended per site policy.
7. Can it be used in hazardous areas?
Certain models offer ATEX/IECEx certification for hazardous zone applications.
8. How is the output range configured?
It is pre-configured at the factory; custom ranges are available on request.
9. What is the accuracy of the measurement?
Typical accuracy is ±1% of full-scale output.
10. Is it compatible with SCADA or DCS systems?
Yes, the 4–20 mA output integrates seamlessly with industrial control systems.
Related Models in the Same Series
| Model | Description |
|---|---|
| 990-04-XX-02 | Vibration Transmitter with extended frequency range |
| 991-01-XX-01 | Compact DIN-rail mountable vibration transmitter |
| 990-05-XX-01 | Explosion-proof vibration transmitter |
| 990-04-XX-03 | Dual-channel version for multiple sensor inputs |
| 990-PR-XX-01 | Pressure + vibration dual signal transmitter |
| 990-TEMP-XX-01 | Temperature + vibration integrated transmitter |
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