Why Choose the Bently Nevada 990-10-50-01-CN Vibration Transmitter?
When rotating machinery unexpectedly fails, the cost of downtime can be immense. The 990-10-50-01-CN from Bently Nevada provides a dependable solution by converting vibration into a standard 4-20 mA signal, enabling continuous monitoring and early warning. This transmitter is engineered for industrial environments where accuracy and reliability are non-negotiable.
As part of the 990 series, this model accepts one non-contacting 3300 NSv Proximity Probe and extension cable, making it a versatile choice for existing Bently Nevada monitoring systems. Its compact design and straightforward installation help minimize disruption to your operations.
Key Features and Technical Specifications
The 990-10-50-01-CN offers a full-scale range of 0-10 mils peak-to-peak (0-250 μm pp), providing precise measurement for typical vibration monitoring applications. The transmitter operates on a +12 to +35 Vdc input at the terminal, ensuring compatibility with common power supplies. Its 4-20 mA output is proportional to the full-scale range, delivering a clear, industry-standard signal for PLCs, DCS, or standalone meters.
- Full-scale range: 0-10 mils pp (0-250 μm pp)
- Input: Accepts 1 non-contacting 3300 NSv Proximity Probe and extension cable
- Power: +12 to +35 Vdc at the transmitter terminal
- Output: 4-20 mAdc over specified full-scale range in 2-wire configuration
- Accuracy: Within ±1.5% over full-scale range (from TEST signal input to voltage across 250 Ω load)
- 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
- Mounting: 35 mm DIN rail clips
One distinctive feature is the NOT OK/signal defeat function: if a fault occurs, the signal output drops to less than 3.6 mA within 100 µs, and it restores within 2-3 seconds after the condition clears. This rapid response helps protect downstream equipment and alerts operators immediately.
Real-World Applications
The 990-10-50-01-CN is well-suited for monitoring vibration in pumps, motors, fans, and other rotating machinery. In manufacturing plants, early detection of excessive vibration can prevent catastrophic failures and reduce unplanned downtime. For example, in a continuous process line, this transmitter can feed vibration data to a control system, allowing operators to schedule maintenance before a breakdown occurs.
Its 2-wire configuration simplifies wiring, and the DIN rail mounting option makes installation in existing panels straightforward. The country-specific approval (CN) ensures compliance with local regulations, making it a practical choice for global operations.
Installation and Setup
Proper installation is critical for accurate vibration measurement. 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 maximum leadwire length for the Proximitor Sensor Output (BNC connector) is 3 meters (10 feet). Ensure the power supply provides +12 to +35 Vdc at the transmitter terminal, and verify the loop resistance does not exceed 1,000 Ω at 35 Vdc.
Mount the transmitter on a 35 mm DIN rail using the provided clips. Connect the proximity probe and extension cable, then wire the 4-20 mA output to your monitoring system. After installation, perform a gap adjustment and verify the output signal corresponds to the expected vibration level.
Maintenance and Reliability
Routine inspection of the probe and cable is recommended to ensure reliable operation. Check for any physical damage or contamination on the probe tip, as this can affect measurement accuracy. Periodically verify the power supply voltage and loop resistance to stay within specified limits.
The transmitter's robust design and current limiting feature (23 mA typical) help protect against overcurrent conditions. With proper care, this unit can provide years of dependable service.
Compatibility and Integration
The 990-10-50-01-CN is designed to work with Bently Nevada 3300 NSv proximity probes and extension cables. Its 4-20 mA output is universally accepted by most PLCs, DCS, and SCADA systems, allowing easy integration into existing monitoring architectures. For hazardous area installations, the unit is approved for NonHazardous, Zone 2, or Div 2 locations with a power supply of 28 V.
Product Support and Availability
The Bently Nevada 990-10-50-01-CN is available from AutoDCSTech. Please verify current lifecycle status and availability with AutoDCSTech before ordering. Our team can assist with technical questions and ensure you receive the right part for your application.
