Product Overview
When unplanned downtime threatens production, the Bently Nevada 990-10-50-02-01 990 Vibration Transmitter provides a cost-saving solution. This industrial automation module converts proximity probe signals into a linear 4-20 mA output, enabling continuous vibration monitoring of rotating equipment. Designed for harsh environments, the 990-10-50-02-01 helps maintenance teams detect bearing wear, imbalance, and misalignment early — reducing repair costs and extending machinery life.
The Bently Nevada 990-10-50-02-01 operates with a standard 3300 NSv proximity probe and accepts +12 to +35 Vdc power. With a full-scale range of 0-10 mils pp (0-250 μm pp) and loop accuracy within ±1.5%, it delivers reliable data for condition-based maintenance programs.
Technical Specifications
The Bently Nevada 990-10-50-02-01 offers key parameters that ensure precise vibration measurement:
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Input: Accepts 1 non-contacting 3300 NSv Proximity Probe and extension cable.
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Full-scale option: 0-10 mils pp (0-250 μm pp)
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System length: 5.0 meters (16.4 feet)
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Output: 4-20 mAdc over specified full-scale range (2-wire configuration)
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Loop accuracy: Within ±1.5% from TEST signal to voltage across a 250 Ω load
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Power supply: +12 to +35 Vdc at transmitter terminal
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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) from target
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Minimum target size: 9.5 mm (0.375 in) diameter
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Leadwire length: Max 3 meters (10 ft) for Proximitor Sensor Output (BNC)
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NOT OK/signal defeat: Output <3.6 mA within 100 µs, restored in 2-3 seconds
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Weight: 0.43 kg (0.9 lbm)
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Mounting: Bulkhead screws
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Agency approval: CSA Division 2
Industry Applications
The Bently Nevada 990-10-50-02-01 excels in continuous vibration monitoring for compressors, pumps, fans, and turbines. In a petrochemical plant, early detection of shaft vibration using this transmitter prevents catastrophic seal failures — saving thousands in unplanned repairs. Similarly, in power generation, the 990-10-50-02-01 provides the accuracy needed for predictive maintenance programs, reducing downtime and extending overhaul intervals.
Installation & Setup Guidance
Mount the Bently Nevada 990-10-50-02-01 using the included bulkhead screws. Ensure the 3300 NSv probe is gapped between 0.5 and 1.75 mm from the target. Connect the extension cable to the transmitter’s BNC connector (max cable length 3 meters). Apply +12 to +35 Vdc power at the transmitter terminals. Use the non-interacting zero and span adjustments to calibrate the 4-20 mA output for your full-scale range. Verify loop resistance does not exceed 1,000 Ω at 35 Vdc.
Compatibility & Integration
The Bently Nevada 990-10-50-02-01 is designed for seamless integration with existing Bently Nevada 3300 NSv proximity probe systems. It outputs a standard 4-20 mA signal compatible with most PLCs, DCS, and vibration monitoring systems. The CSA Division 2 approval makes it suitable for hazardous area locations (Zone 2/Div 2) with a 28 V power supply limit.
Troubleshooting & Common Issues
If the 4-20 mA loop current exceeds 23 mA, check for probe short circuits or improper gap. A signal below 3.6 mA indicates a NOT OK condition (probe fault or power loss). The transmitter self-recovers within 2-3 seconds after the fault clears. For erratic readings, verify probe gap remains within 0.5-1.75 mm and that loop resistance stays under 1,000 Ω. Always use the correct 3300 NSv probe; incompatible probes degrade accuracy.
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