Product Overview
In critical rotating machinery, undetected vibration can lead to catastrophic failures. The Bently Nevada 990-08-50-01-00 990 Vibration Transmitter provides continuous, precise vibration monitoring to safeguard your assets. This compact transmitter accepts one non-contacting 3300 NSv proximity probe and delivers a 4-20 mA signal proportional to shaft vibration. With its built-in NOT OK/signal defeat feature, the 990-08-50-01-00 automatically drives the output below 3.6 mA within 100 µs if a fault condition occurs, enabling rapid system shutdown and preventing further damage.
Technical Specifications Breakdown
The Bently Nevada 990-08-50-01-00 is engineered for accuracy and reliability. Below are key performance metrics derived from the product data:
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Full-Scale Range: 0-8 mils pp (0-200 μm pp) – option code 08 ensures compatibility with standard vibration monitoring thresholds.
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System Length: 5.0 meters (16.4 feet) – option code 50 provides optimal cable length for typical installations.
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Mounting: 35 mm DIN rail clips – option code 01 simplifies panel integration.
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Power Supply: Requires +12 to +35 Vdc input at the transmitter terminal, allowing flexible integration with existing control systems.
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Loop Accuracy: Within ±1.5% over specified full-scale range (measured with 250 Ω load), ensuring dependable data for condition monitoring.
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Frequency Response: 5 Hz to 6,000 Hz +0, -3 dB – covers common machine vibration frequencies.
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Current Limiting: 23 mA typical protects against loop faults.
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Weight: 0.43 kg (0.9 lbm) – lightweight for easy handling.
Industry Applications
The Bently Nevada 990-08-50-01-00 excels in environments where machine health is paramount. Typical use cases include:
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Pump vibration monitoring: In petrochemical plants, early detection of impeller imbalance prevents seal failures. The 990-08-50-01-00’s 5 Hz to 6,000 Hz frequency range captures both low-speed runout and high-frequency blade pass vibrations.
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Compressor protection: For centrifugal compressors, the transmitter’s <1.5% loop accuracy ensures reliable shutdown decisions. The NOT OK/signal defeat feature triggers within 100 µs if the probe signal is lost, minimizing risk of catastrophic damage.
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Fan and blower monitoring: In HVAC or industrial ventilation, the 990-08-50-01-00’s 0-8 mils full-scale range is ideal for detecting imbalance and bearing wear. DIN rail mounting simplifies retrofit into existing cabinets.
Installation & Setup Guidance
Proper installation maximizes the 990-08-50-01-00’s performance. Key steps:
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Probe gap: Ensure the proximity probe is gapped between 0.5 and 1.75 mm (20-55 mils) from the target to achieve full-scale range.
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Wiring: Connect +12 to +35 Vdc at the transmitter terminals. The loop resistance must not exceed 1,000 Ω (including cable) at 35 Vdc to maintain accuracy.
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Mounting: Use the 35 mm DIN rail clips provided (option 01) for secure attachment inside a control panel. Keep the BNC connector for Proximitor Sensor output within 3 meters of the transmitter to avoid signal degradation.
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Zero and span adjustments: Non-interacting external potentiometers allow fine-tuning without affecting each other.
Maintenance & Reliability
The Bently Nevada 990-08-50-01-00 is built for minimal maintenance. Routine checks include verifying the probe gap and loop resistance. The transmitter’s current limiting (23 mA typical) protects against short circuits. In case of a Not OK condition, the output drops below 3.6 mA within 100 µs and automatically restores 2-3 seconds after the fault is cleared, reducing false trips. No scheduled calibration is required beyond standard system validation per your plant’s procedures.
Selection Guide & Purchasing Advice
When sourcing the Bently Nevada 990-08-50-01-00, verify the full-scale option (08), system length (50), mounting (01), and agency approval (00) match your application requirements. For dependable supply, contact ubest101 – a trusted industrial automation parts supplier. They stock genuine Bently Nevada modules to minimize downtime. Ensure your system can accommodate the +12 to +35 Vdc power requirement and that the probe is a compatible 3300 NSv type.