Buyer's Guide: Bently Nevada 990-10-50-02-01 Vibration Transmitter
When you need reliable vibration monitoring in hazardous areas, the 990-10-50-02-01 from Bently Nevada is a proven choice. This 990 Vibration Transmitter is designed to convert proximity probe signals into a standard 4-20 mA output, enabling seamless integration with your existing control systems. It is built for demanding industrial environments and offers a straightforward path to continuous machine protection.
Key Features and Technical Specifications
This transmitter is engineered for precision and durability. Its core specifications are tailored for accurate vibration measurement and reliable signal transmission.
- Full-scale range: 0-10 mils pp (0-250 μm pp).
- System length: 5.0 meters (16.4 feet).
- Mounting: Bulkhead screws.
- Agency approval: CSA Division 2.
- Input: Accepts one non-contacting 3300 NSv Proximity Probe and extension cable.
- Power: Requires +12 to +35 Vdc input at the transmitter terminal.
- Maximum loop resistance: 1,000 Ω including cable at 35 Vdc.
- Current limiting: 23 mA typical.
- Signal output: 4 to 20 mAdc over specified full-scale range in 2-wire configuration.
- Loop accuracy: Within ±1.5% over specified full-scale range.
- Frequency response: 5 Hz to 6,000 Hz +0, 3 dB.
- Minimum target size: 9.5 mm (0.375 in) diameter.
- Not OK/signal defeat: Output goes to less than 3.6 mA within 100 µs after a Not OK condition.
One distinctive feature is the fast Not OK response. The signal output drops below 3.6 mA within 100 µs, ensuring that any fault is immediately communicated to your monitoring system. This rapid response can be critical for preventing machine damage.
Applications and Use Cases
This transmitter is ideal for rotating machinery such as pumps, motors, and compressors. It is particularly suited for installations in hazardous areas where CSA Division 2 certification is required. For example, in a chemical plant, the 990-10-50-02-01 can monitor shaft vibration on a critical pump, providing real-time data to operators. Its 4-20 mA output integrates easily with PLCs and DCS systems, simplifying retrofits and new installations.
Installation and Setup
Proper installation is key to reliable operation. The transmitter accepts a 3300 NSv Proximity Probe and extension cable. The probe must be gapped between 0.5 and 1.75 mm (20 and 55 mils) from the target to ensure full-scale range. Use the bulkhead screw mounting option for secure attachment. The leadwire length from the Proximitor Sensor Output (BNC connector) should not exceed 3 meters (10 feet). Ensure the power supply provides +12 to +35 Vdc at the transmitter terminal, and verify that the total loop resistance (including cable) does not exceed 1,000 Ω at 35 Vdc.
Maintenance and Reliability
Regular inspection of the probe and cable is recommended to ensure accurate readings. Check the gap periodically, as changes can affect the measurement. The transmitter's zero and span are non-interacting external adjustments, making calibration straightforward. Since this is a safety-related device, always follow the manufacturer's manual for any maintenance procedures. The device is designed for long-term reliability in harsh environments.
Compatibility and Integration
The 4-20 mA output is universally compatible with most control systems, including PLCs, DCS, and SCADA. The transmitter operates in a 2-wire configuration, simplifying wiring. The CSA Division 2 approval allows installation in hazardous locations. For detailed integration guidelines, refer to the Bently Nevada documentation.
Product Support and Availability
The 990-10-50-02-01 is available from AutoDCSTech. Please verify current lifecycle status and availability with AutoDCSTech before ordering. For technical support, contact our team for assistance.
