Product Introduction
When machinery vibration exceeds safe limits, unplanned downtime and costly damage can result. The Bently Nevada 990-05-50-01-01 990 Vibration Transmitter provides reliable, real-time monitoring to protect your rotating equipment. This industrial automation module accepts a single non-contacting 3300 NSv Proximity Probe and extension cable, converting vibration into a 4-20 mA signal for PLC or DCS integration. Designed for CSA Division 2 hazardous locations, the 990-05-50-01-01 is a rugged, field-proven solution for continuous vibration monitoring.
Technical Specifications Breakdown
Key parameters for the Bently Nevada 990-05-50-01-01 include:
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Full-scale option: 0-5 mils pp (0-125 μm pp)
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System length: 5.0 metres (16.4 feet)
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Mounting: 35 mm DIN rail clips
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Power requirement: +12 to +35 Vdc input at transmitter terminal
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Output signal: 4-20 mAdc over full-scale range in 2-wire configuration
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Loop accuracy: Within ±1.5% (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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Maximum loop resistance: 1,000 Ω at 35 Vdc
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Current limiting: 23 mA typical
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Probe gap: 0.5 to 1.75 mm (20 to 55 mils) for full scale
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Weight: 0.43 kg (0.9 lbm)
The NOT OK/signal defeat function forces output below 3.6 mA within 100 µs upon fault detection, and restores within 2-3 seconds after clearance. This protects downstream systems from false readings.
Applications & Use Cases
The Bently Nevada 990-05-50-01-01 excels in environments where early vibration detection is critical. Typical applications include:
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Pumps and compressors: Monitor shaft vibration to prevent bearing failure and unplanned shutdowns.
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Fan and blower systems: Detect imbalance or misalignment before they cause structural damage.
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Turbomachinery: Provide continuous vibration data for performance analytics and predictive maintenance.
Given its CSA Division 2 approval, the 990-05-50-01-01 is ideal for oil & gas, chemical, and other hazardous area installations.
Installation & Setup Guidance
Mount the Bently Nevada 990-05-50-01-01 using the 35 mm DIN rail clips provided. Ensure the proximity probe is gapped between 0.5 and 1.75 mm (20-55 mils) from the target surface to achieve full-scale range. The transmitter requires a +12 to +35 Vdc power supply at its terminals; verify polarity and loop resistance does not exceed 1,000 Ω at 35 Vdc. The leadwire from the Proximitor Sensor Output (BNC connector) should not exceed 3 metres (10 feet). Use shielded cable in noisy environments to maintain signal integrity.
Troubleshooting & Common Issues
Common issues with vibration transmitters often stem from improper probe gap or power supply fluctuations. The Bently Nevada 990-05-50-01-01 includes a NOT OK/signal defeat function that drives output below 3.6 mA within 100 µs if a fault occurs—such as probe damage or loss of power. This immediate reaction prevents controllers from acting on erroneous data. If the output remains at 4 mA or below, check the probe gap and verify the power supply is within +12 to +35 Vdc. The transmitter’s current limiting at 23 mA typical protects against loop shorts. For replacement or upgrade needs, contact PLC Source PRO (visit ubest101) for genuine Bently Nevada 990-05-50-01-01 inventory.