Product Overview
The Bently Nevada 990-04-50-01-01 is a high-performance 990 Vibration Transmitter designed for continuous machine condition monitoring. This industrial automation module converts proximity probe signals into a standardized 4-20 mA output, enabling early detection of vibration anomalies. Proudly made in the USA, the 990-04-50-01-01 is built for critical rotating equipment in hazardous environments.
Technical Specifications
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Input: Accepts 1 non-contacting 3300 NSv Proximity Probe and extension cable
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Power Requirements: +12 to +35 Vdc input at the transmitter terminal
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Signal Output: 4 to 20 mAdc over specified full-scale range (0-4 mils pp / 0-100 μm pp) in 2-wire configuration
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Loop Accuracy: Within ±1.5% over full-scale range (additional to Prox Out Incremental Scale Factor)
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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 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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Mounting: 35 mm DIN rail clips (option 01)
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Agency Approval: CSA Division 2 for non-hazardous / Zone 2 / Div 2 areas
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Weight: 0.43 kg (0.9 lbm)
Industry Applications
The Bently Nevada 990-04-50-01-01 is ideal for monitoring pumps, compressors, fans, and turbines in oil & gas, petrochemical, power generation, and water treatment plants. Its full-scale range of 0-4 mils pp and frequency response up to 6 kHz allow precise detection of imbalance, misalignment, and bearing wear. The integral NOT OK/signal defeat function (output <3.6 mA within 100 µs) ensures immediate fault indication, preventing catastrophic failure.
Installation & Setup Guidance
Mount the 990-04-50-01-01 using the supplied DIN rail clips (option 01). Ensure the proximity probe is gapped between 0.5 and 1.75 mm from the target. Connect a 3300 NSv probe and extension cable to the transmitter input. Wire the 4-20 mA loop in a 2-wire configuration with a power supply of +12 to +35 Vdc. Non-interacting zero and span adjustments simplify calibration. For Proximitor Sensor Output via BNC, keep leadwire length within 3 meters (10 feet).
Maintenance & Reliability
This vibration transmitter offers exceptional long-term reliability with typical current limiting of 23 mA and robust CSA Division 2 approval for harsh environments. Periodic verification of probe gap and loop resistance (max 1,000 Ω) ensures consistent performance. The Bently Nevada 990-04-50-01-01 reduces unplanned downtime by providing early warning of machinery degradation, maximizing return on investment through proactive maintenance.
Selection Guide & Purchasing Advice
Before ordering, confirm your required full-scale range (0-4 mils pp), system length (5.0 metres / 16.4 ft), mounting option (DIN rail clips), and agency approval (CSA Division 2). The 990-04-50-01-01 is in stock at PLC Source PRO (PLC Source PRO). For bulk inquiries or expedited shipping, contact our sales team. Ensure compatibility with your existing 3300 NSv proximity probes and extension cables.