Introduction to the 990-10-50-01-01 Vibration Transmitter
When rotating machinery vibration threatens uptime, the 990-10-50-01-01 from Bently Nevada delivers 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. Designed for continuous operation in industrial environments, it provides a direct interface to PLCs, DCS, or standalone monitors.
Key Features and Technical Specifications
The 990-10-50-01-01 offers a full-scale range of 0-10 mils pp (0-250 μm pp), making it suitable for a wide variety of rotating equipment. Its 5.0-meter (16.4 feet) system length provides installation flexibility. The unit mounts on standard 35 mm DIN rail clips, simplifying panel integration.
- Input: Accepts 1 non-contacting 3300 NSv Proximity Probe and extension cable.
- Power: Requires +12 to +35 Vdc input at the transmitter terminal.
- Output: 4 to 20 mAdc over specified full-scale range in 2-wire configuration.
- Accuracy: Within ±1.5% over specified full-scale range (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.
- Agency Approval: CSA Division 2 (NonHazardous, Zone 2 or Div 2 Hazardous area locations).
Installation and Setup
Mount the 990-10-50-01-01 on a 35 mm DIN rail using the provided clips. Ensure the proximity probe is correctly gapped between 0.5 and 1.75 mm (20 and 55 mils) from the target to achieve full-scale range. Connect the probe and extension cable to the transmitter input. Wire the loop power supply (+12 to +35 Vdc) and the 4-20 mA output to your monitoring system. The maximum leadwire length for the Proximitor Sensor Output (BNC connector) is 3 meters (10 feet).
Maintenance and Reliability
Regularly inspect the transmitter and probe cable for damage or wear. Verify the gap setting periodically, as changes can affect measurement accuracy. Because the unit is CSA Division 2 certified, it is suitable for use in hazardous areas; follow all local safety codes and the manufacturer's manual during maintenance. The non-interacting zero and span adjustments simplify calibration, reducing downtime.
Compatibility and Integration
The 990-10-50-01-01 integrates seamlessly with any system that accepts a standard 4-20 mA loop. It is compatible with Bently Nevada 3300 NSv proximity probes and extension cables. The 2-wire configuration simplifies wiring, and the 4-20 mA signal can be fed directly into PLC analog input modules, DCS systems, or dedicated vibration monitors.
Troubleshooting and Common Issues
If the output signal drops below 3.6 mA, a Not OK condition exists. The signal output goes to less than 3.6 mA within 100 µs after a Not OK condition occurs, and is restored within 2-3 seconds after the condition is removed. Check the probe gap, cable integrity, and power supply voltage if the output is not within the expected range. Ensure the loop resistance does not exceed 1,000 Ω at 35 Vdc.
Product Support and Availability
The 990-10-50-01-01 is available from AutoDCSTech. Contact our team to verify current lifecycle status and availability before ordering. We are ready to support your vibration monitoring needs.
