Product Overview
The Bently Nevada 990-08-50-03-00 is a precision 990 Vibration Transmitter designed for continuous vibration monitoring in industrial rotating machinery. This Industrial Automation Module converts proximity probe signals into a 4 to 20 mA DC output proportional to full-scale displacement (0-8 mils pp or 0-200 μm pp). Housed in a robust enclosure with DIN clip and screw mounting (option 03), it operates from a +12 to +35 Vdc supply and delivers reliable performance for predictive maintenance programs.
At PLC Source PRO, we understand that unscheduled downtime costs thousands per hour. The 990-08-50-03-00 helps you avoid unexpected failures by providing real-time shaft vibration data, enabling condition-based maintenance. This transmitter is built for long service life in harsh environments, reducing total cost of ownership.
Technical Specifications
The Bently Nevada 990-08-50-03-00 offers key specifications derived from factory data:
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Full-scale Range: Option 08 – 0-8 mils pp (0-200 μm pp)
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System Length: Option 50 – 5.0 meters (16.4 feet)
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Input: Accepts 1 non-contacting 3300 NSv Proximity Probe and extension cable
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Power Supply: +12 to +35 Vdc at transmitter terminal
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Output: 4 to 20 mAdc over specified full-scale range, 2-wire configuration
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Loop Accuracy: Within ±1.5% over full-scale (measured across 250 Ω, excludes probe scale factor error)
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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 Range: 0.5 to 1.75 mm (20 to 55 mils) from target
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Minimum Target Size: 9.5 mm (0.375 in) diameter
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NOT OK/Signal Defeat: Output drops below 3.6 mA within 100 μs after Not OK condition; restores within 2-3 seconds after removal
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Weight: 0.43 kg (0.9 lbm)
Installation and Setup
Mount the Bently Nevada 990-08-50-03-00 using the provided DIN clips and screws (option 03). Ensure the probe is correctly gapped between 0.5 and 1.75 mm from the target to achieve full-scale range. Connect a compatible 3300 NSv proximity probe and extension cable (max 3 meters for BNC output). Supply +12 to +35 Vdc to the transmitter terminals. The 4-20 mA loop must have total resistance ≤1,000 Ω at 35 Vdc to maintain accuracy. Adjust zero and span via non-interacting external controls. Verify proper operation by monitoring the output after power-up; a condition of less than 3.6 mA indicates a Not OK state.
Maintenance and Reliability
To maximize ROI, perform periodic visual inspections of the transmitter and probe connections. Check that the probe gap remains within specification. Clean the probe tip as needed to prevent debris interference. The 990-08-50-03-00 features current limiting (23 mA typical) to protect against loop faults. In Div 2 or Zone 2 hazardous areas, ensure the power supply is limited to 28 V (as specified). By integrating this transmitter into your predictive maintenance program, you reduce unplanned downtime and extend equipment life.
Selection Guide
When ordering the Bently Nevada 990-08-50-03-00, verify your full-scale, system length, mounting, and agency options. This model includes full-scale option 08 (0-8 mils), system length 5.0 m, DIN clip/screw mounting, and no agency approval. Ensure your control system accepts 4-20 mA inputs. For additional accessories or integration support, contact PLC Source PRO (ubest101). We stock genuine Bently Nevada modules and can help match your requirements.