Introduction to the 991-06-50-02-CN Thrust Transmitter
In turbomachinery, axial shaft position is critical. Excessive thrust can damage bearings and seals. The 991-06-50-02-CN from Bently Nevada provides continuous monitoring. It converts proximity probe signals into a standard 4-20 mA output. This allows integration with PLCs and DCS systems. The transmitter is designed for axial position measurement. It is part of the 991 series. This model includes a full-scale option of 0.6-0-0.6 mm. It also has a 5.0-meter system length. The mounting option uses bulkhead screws. The agency approval is country-specific for CN.
Key Features and Technical Specifications
The 991-06-50-02-CN offers precise measurement. It accepts one non-contacting 3300 NSv proximity probe and extension cable. The power requirement is +12 to +35 Vdc at the transmitter terminal. The output is 4-20 mA over the specified full-scale range. This is a two-wire configuration. The linear range is 0.25 to 1.65 mm for Prox Out. It is suitable for 0.6-0-0.6 mm or 25-0-25 mils current loop linear ranges. The loop accuracy is within ±1.5% over the full-scale range. The maximum loop resistance is 1,000 ohms including cable at 35 Vdc. Current limiting is 23 mA typical. Zero and span adjustments are non-interacting and external. The signal output goes to less than 3.6 mA within 100 µs after a Not OK condition. It restores within 0.1 seconds after the condition is removed.
Environmental and Physical Specifications
The transmitter operates in temperatures from -35°C to +85°C. Storage temperature ranges from -51°C to +100°C. The weight is 0.43 kg (0.9 lbm). The mounting is DIN rail. The system length is 5.0 meters (16.4 feet). The mounting option is bulkhead screws. These specifications ensure reliable operation in harsh industrial environments.
Applications and Use Cases
The 991-06-50-02-CN is used in rotating machinery. It monitors axial displacement in turbines, compressors, and pumps. This helps prevent catastrophic failures. The 4-20 mA output integrates with existing control systems. It provides real-time data for predictive maintenance. The transmitter is ideal for applications requiring accurate thrust monitoring. It is also suitable for safety-critical systems. The DIN rail mounting simplifies installation in control cabinets.
Installation and Setup
Installation is straightforward. Mount the transmitter on a DIN rail. Connect the proximity probe and extension cable. The system length is 5.0 meters. Use bulkhead screws for secure mounting. Wire the power supply (+12 to +35 Vdc) and the 4-20 mA output. Ensure proper grounding. Adjust zero and span using the external controls. Verify the signal with a multimeter. Follow the manufacturer's manual for detailed instructions.
Maintenance and Reliability
Regular inspection ensures long-term reliability. Check the transmitter for physical damage. Verify the probe and cable integrity. Monitor the output signal for drift. Clean the DIN rail and connections periodically. The operating temperature range is wide, but avoid extreme conditions. The Not OK feature provides fast fault indication. This enhances system reliability. For safety-rated applications, follow the manufacturer's safety manual. No specific cleaning solvents are recommended.
Troubleshooting Common Issues
If the output is not within 4-20 mA, check the power supply. Ensure the voltage is between +12 and +35 Vdc. Verify the probe gap and linear range. If the signal goes below 3.6 mA, a Not OK condition exists. Check the probe and cable for faults. Use the zero and span adjustments to calibrate. If issues persist, consult the official Bently Nevada documentation. Contact AutoDCSTech for support.
Compatibility and Integration
The 991-06-50-02-CN works with standard control systems. The 4-20 mA output is universally accepted. It can connect to PLC analog input modules. It can also connect to DCS systems. The two-wire configuration simplifies wiring. The transmitter is compatible with Bently Nevada 3300 NSv probes. No specific protocols are mentioned. Refer to the datasheet for detailed compatibility.
Product Support and Availability
The 991-06-50-02-CN is available from AutoDCSTech. It is in stock and ready to ship. Contact AutoDCSTech for pricing and delivery. For technical support, refer to the official Bently Nevada documentation. Ensure you verify the current lifecycle status before ordering.
