The Bently Nevada 330750-40 is a specialized High Temperature Velomitor system designed for monitoring the vibration of rotating machinery in extreme environments. By combining a remote sensor with a specialized signal conditioner, it provides accurate seismic vibration measurements in areas where standard sensors would fail due to excessive heat. This system is essential for maintaining the health and reliability of gas turbines, steam turbines, and large centrifugal compressors.
Product Specifications
| Feature | Specification |
| Model | Bently Nevada 330750-40 |
| Measurement Type | Seismic Vibration (Velocity) |
| Temperature Range | Up to 250°C (482°F) |
| Frequency Response | 10 Hz to 1000 Hz |
| Sensor Housing | Ruggedized Stainless Steel |
| Output | 4-20 mA or Proportional Voltage |
| Origin | United States |
Applications
The 330750-40 system is engineered for industrial assets operating at elevated temperatures:
- Gas Turbines: Monitoring vibration near combustion chambers or exhaust sections.
- Steam Turbines: Measuring bearing and casing vibration at high-temperature steam entry points.
- Centrifugal Compressors: Protection of high-heat discharge stages.
- Process Machinery: Monitoring pumps or fans handling high-temperature gases or fluids.
Usage Instructions
- Mounting: Secure the sensor to the machine casing using the provided mounting stud. Ensure the surface is flat and free of debris to allow for optimal vibration transmission.
- Cabling: Use the specified high-temperature, mineral-insulated, or braided cable to connect the sensor to the remote signal conditioner. Ensure cables are routed away from moving parts.
- Conditioner Installation: Mount the signal conditioner in a cool, accessible control cabinet. It should not be exposed to the high temperatures found at the sensor site.
- Calibration: Use a vibration calibrator to verify the output scale (e.g., in/sec or mm/sec) against the signal conditioner’s settings during commissioning.
- Monitoring: Connect the signal conditioner’s output to your plant’s DCS or PLC (e.g., Bently Nevada 3500 series) for continuous vibration analysis and alarming.
Frequently Asked Questions (Q&A)
Q: Why is this system called “remote”?
A: Because the sensor element is rated for high-temperature zones, while the sensitive electronics (the signal conditioner) must remain in a safe, cool environment. The system separates these to ensure longevity.
Q: Can I use this for low-frequency monitoring?
A: The 330750 is optimized for standard industrial vibration (10 Hz to 1000 Hz). For very low-frequency monitoring, please consult the specific frequency response chart in the product datasheet.
Q: Does the system require a specific power supply?
A: Yes, the signal conditioner typically requires a stable 24 VDC power source to drive the internal circuitry and the 4-20 mA output loop.
Recommended Related Products
- Bently Nevada 3500/42M Vibration Monitor
- Bently Nevada 330500 Velomitor Sensor
- Bently Nevada 330750-01 (Standard Temp Version)
- Bently Nevada High-Temperature Extension Cables
- Bently Nevada 1900/65A Monitor
- Bently Nevada 330400 Acceleration Sensor
- Bently Nevada Signal Conditioner Enclosures
- Bently Nevada Calibration Kits (TK-3)
- Bently Nevada 3500/22M Transient Data Interface
- Bently Nevada 3500/15 Power Supply Module
