990-10-50-02-CN Overview
When machine vibration threatens uptime, the 990-10-50-02-CN from Bently Nevada provides a precise, loop-powered solution. This 990 Vibration Transmitter accepts one non-contacting 3300 NSv Proximity Probe and extension cable, converting dynamic shaft vibration into a standard 4-20 mA signal. Built for continuous operation in industrial environments, it delivers dependable data for condition monitoring and protection systems.
Key Specifications of the 990-10-50-02-CN
The 990-10-50-02-CN is engineered for accuracy and simplicity. Its full-scale range is 0-10 mils pp (0-250 μm pp), matching many rotating machinery applications. The system length option is 5.0 meters (16.4 feet), and mounting is via bulkhead screws. This unit requires +12 to +35 Vdc input at the transmitter terminal, with a maximum loop resistance of 1,000 Ω including cable at 35 Vdc. Current limiting is 23 mA typical. The 4-20 mA output is provided in a 2-wire configuration, with accuracy within ±1.5% over the specified full-scale range.
Key parameters include:
- Input: Accepts 1 non-contacting 3300 NSv Proximity Probe and extension cable.
- Power: +12 to +35 Vdc at transmitter terminal.
- Output: 4-20 mAdc over full-scale range.
- Loop Accuracy: ±1.5% (from TEST signal to voltage across 250 Ω loop resistance).
- Maximum Loop Resistance: 1,000 Ω including cable at 35 Vdc.
- Current Limiting: 23 mA typical.
- Frequency Response: 5 Hz to 6,000 Hz +0, 3 dB.
- Minimum Target Size: 9.5 mm (0.375 in) diameter.
- Probe Gap: 0.5 to 1.75 mm (20 to 55 mils) from target.
- NOT OK/Signal Defeat: Output goes to less than 3.6 mA within 100 µs after a Not OK condition; restores within 2-3 seconds after removal.
Applications and Use Cases
The 990-10-50-02-CN is ideal for monitoring shaft vibration in pumps, motors, fans, and other rotating equipment. Its 4-20 mA output integrates easily with PLCs, DCS, and SCADA systems. For example, in a chemical plant, this transmitter can feed vibration data to a control room, enabling early detection of imbalance or bearing wear. Additionally, its compact design and bulkhead mounting simplify installation in tight spaces.
Installation and Setup
Proper installation is critical for accurate readings. The probe must be gapped between 0.5 and 1.75 mm (20 and 55 mils) from the target to ensure full-scale range. The transmitter requires a +12 to +35 Vdc power supply at its terminal. For hazardous area locations (NonHazardous, Zone 2 or Div 2), a 28 V power supply is specified. Ensure the maximum cable distance for the Proximitor Sensor Output (BNC connector) is 3 meters (10 feet). Mount using the bulkhead screws provided, and verify all connections before power-up.
Maintenance and Reliability
Routine inspection of the probe and cable is recommended to maintain measurement integrity. Check for proper gap and secure mounting periodically. Because the transmitter uses loop power, there are no internal batteries to replace. The NOT OK/signal defeat feature enhances reliability by forcing the output below 3.6 mA within 100 µs of a fault, alerting operators immediately. This fast response helps prevent costly downtime.
Compatibility and Integration
The 990-10-50-02-CN works with Bently Nevada 3300 NSv proximity probes and extension cables. Its 4-20 mA output is universally accepted by most industrial control systems. For hazardous area installations, ensure the power supply meets the 28 V requirement. This transmitter is designed for seamless integration into existing monitoring architectures.
Troubleshooting Common Issues
If the output is not within the expected range, first verify the probe gap and cable connections. Check the power supply voltage at the transmitter terminal—it must be between +12 and +35 Vdc. If the output goes below 3.6 mA, a Not OK condition may be present; inspect the probe and target. For persistent issues, consult the official Bently Nevada documentation or contact AutoDCSTech for support.
Availability and Support
The 990-10-50-02-CN is available from AutoDCSTech, an industrial automation parts supplier. Please verify current lifecycle status and availability with AutoDCSTech before ordering. Our team can assist with product selection and technical questions.
