Product Overview: Bently Nevada 990-05-50-02-CN Vibration Transmitter
When unplanned machinery shutdowns threaten production uptime, the Bently Nevada 990-05-50-02-CN provides reliable vibration monitoring and early fault detection. This 990 Vibration Transmitter is designed for continuous measurement of shaft vibration in rotating machinery such as turbines, compressors, and pumps. As a key industrial automation component, the 990-05-50-02-CN accepts inputs from a non-contacting 3300 NSv proximity probe and delivers a 4-20 mA output proportional to vibration amplitude.
Technical Specifications Breakdown
The Bently Nevada 990-05-50-02-CN offers critical parameters ensuring accurate and reliable operation:
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Input: Accepts one non-contacting 3300 NSv proximity probe with extension cable.
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Power Requirement: +12 to +35 Vdc at the transmitter terminal.
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Output: 4-20 mA over specified full-scale range (0-5 mils pp or 0-125 μm pp) in 2-wire configuration.
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Loop Accuracy: ±1.5% of full-scale range (additional to Prox Out Incremental Scale Factor).
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Frequency Response: 5 Hz to 6,000 Hz +0, -3 dB.
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Probe Gap: 0.5 to 1.75 mm (20 to 55 mils) from target.
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Current Limiting: 23 mA typical.
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Not OK/Signal Defeat: Output goes below 3.6 mA within 100 µs upon fault; restores in 2-3 seconds after fault clears.
Real-World Applications
The 990-05-50-02-CN is ideal for critical rotating equipment monitoring. Typical applications include:
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Centrifugal Compressors: Detect shaft radial vibration to prevent catastrophic failure.
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Steam Turbines: Monitor bearing vibration for early signs of imbalance or misalignment.
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Industrial Pumps: Ensure continuous operation by providing timely warning before damage.
With its rapid Not OK response, the Bently Nevada 990-05-50-02-CN helps minimize downtime and repair costs.
Installation and Setup Guidance
Proper installation ensures reliable performance. The 990-05-50-02-CN uses a bulkhead mounting option (M6 screws). Key setup steps:
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Probe Gap: Adjust the non-contacting probe to a gap between 0.5 and 1.75 mm from the target shaft.
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Leadwire Length: Maximum 3 meters (10 feet) for Proximitor sensor output via BNC connector.
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Loop Wiring: Connect the transmitter in a 2-wire loop; ensure total loop resistance does not exceed 1,000 Ω at 35 Vdc.
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Zero and Span: Use non-interacting external adjustments to calibrate the output.
Troubleshooting and Common Issues
The Bently Nevada 990-05-50-02-CN includes built-in diagnostics to simplify troubleshooting. If a fault occurs, the signal output drops below 3.6 mA within 100 microseconds, indicating a Not OK condition. This rapid response allows immediate corrective action. After the fault is removed, output restores within 2-3 seconds. Common issues include incorrect probe gap or loop resistance exceeding limits. Always verify the gap and loop resistance per specifications.