Introduction
When machinery vibration escalates beyond safe thresholds, the Bently Nevada 990-05-50-01-00 provides immediate, accurate feedback. This 990 Vibration Transmitter converts proximity probe signals into a linear 4-20 mA output, enabling continuous monitoring of rotating equipment. Designed for industrial automation, it accepts one non-contacting 3300 NSv Proximity Probe and extension cable, delivering critical data for predictive maintenance.
Technical Specifications
The Bently Nevada 990-05-50-01-00 offers precise specifications tailored for vibration monitoring:
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Full-scale Option: 05 = 0-5 mils pp (0-125 µm pp)
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System Length: 5 = 0–5.0 metres (16.4 feet)
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Mounting: 35 mm DIN rail clips
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Input: Accepts 1 non-contacting 3300 NSv Probe and extension cable
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Power: +12 to +35 Vdc at transmitter terminal
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Output: 4-20 mAdc over full-scale range, 2-wire configuration
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Loop Accuracy: Within ±1.5% of full-scale range (measured across 250 Ω)
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Maximum Loop Resistance: 1,000 Ω including cable at 35 Vdc
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Current Limiting: 23 mA typical
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Frequency Response: 5 Hz to 6,000 Hz +0, -3 dB
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Probe Gap: 0.5–1.75 mm (20–55 mils)
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Minimum Target Size: 9.5 mm (0.375 in) diameter
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Leadwire Length: Maximum 3 metres (10 ft) from Proximitor Sensor Output (BNC)
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NOT OK/Signal Defeat: Output <3.6 mA within 100 µs; restores in 2-3 seconds
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Weight: 0.43 kg (0.9 lbm)
Industry Applications
The Bently Nevada 990-05-50-01-00 is ideal for monitoring vibration in critical rotating machinery such as turbines, compressors, and pumps. In oil and gas facilities, it detects early bearing wear or imbalance, preventing catastrophic failures. Similarly, in power generation plants, this transmitter provides real-time data on shaft vibration, enabling condition-based maintenance. Its 0-5 mils pp range makes it suitable for low-amplitude vibration environments where precision is paramount.
Installation & Setup Guidance
Mount the Bently Nevada 990-05-50-01-00 using the included 35 mm DIN rail clips. Connect a 3300 NSv Proximity Probe and extension cable to the input. Ensure probe gap is set between 0.5 and 1.75 mm from the target for accurate full-scale readings. Wire the transmitter in a 2-wire configuration with a DC power supply of +12 to +35 Vdc. Adjust zero and span using the non-interacting external adjustments. Verify output by measuring 4-20 mA across a 250 Ω test resistor.
Maintenance & Reliability
Regularly inspect the probe gap and cable connections. The Bently Nevada 990-05-50-01-00 features a NOT OK/signal defeat that forces output below 3.6 mA within 100 µs if a fault occurs, protecting downstream systems. This rapid response reduces downtime and false alarms. The transmitter operates in non-hazardous, Zone 2, or Div 2 hazardous area locations when powered by a 28 V supply. With no moving parts, it requires minimal maintenance—only periodic verification of loop accuracy.
Selection Guide & Purchasing Advice
Before purchasing the Bently Nevada 990-05-50-01-00, verify your system length option (0–5.0 metres) and mounting preference (DIN rail clips). Ensure compatibility with your existing 3300 NSv probes. For reliable sourcing, ubest101 supplies genuine Bently Nevada parts with verified specifications. Confirm that your application requires the 0-5 mils pp full-scale range; for higher amplitudes, consult the product manual for alternative options.