The Bently Nevada 330500‑00‑20, also cataloged as the Velomitor Piezo‑velocity Sensor, is a vibration transducer engineered for absolute vibration measurement in rotating machinery such as turbines, compressors, pumps, and fans. It connects directly to monitoring platforms like the 3500 series to provide continuous machine health diagnostics.
Key Specifications
Parameter
Specification
Model
330500‑00‑20
Brand
Bently Nevada
Product Type
Piezo‑velocity vibration sensor
Sensitivity
3.94 mV/mm/s (100 mV/in/s) ±5%
Frequency Response
4.5 Hz–5 kHz (±3.0 dB); 6.0 Hz–2.5 kHz (±0.9 dB)
Velocity Range
1270 mm/s (50 in/s) peak
Resonant Frequency
>12 kHz
Output Bias Voltage
–12 ±3.0 VDC
Application
Absolute vibration measurement on industrial machinery
Integration
Direct connection to Bently Nevada 3500 monitoring systems
Functional Description
The Velomitor sensor translates casing vibration into a proportional electrical signal, enabling monitoring systems to track machine health. Its wide frequency response and high velocity range make it suitable for detecting both low‑frequency imbalance and high‑frequency mechanical faults. The –12 VDC bias voltage stabilizes signal output, ensuring compatibility with Bently Nevada monitoring racks.
Frequently Asked Questions
What is the main use of the 330500‑00‑20? It measures absolute casing vibration in rotating machinery to prevent unexpected failures.
Why is resonant frequency important? A resonant frequency above 12 kHz ensures the sensor does not introduce distortion within the measurement band.
Can it connect directly to monitoring systems? Yes, it integrates seamlessly with Bently Nevada 3500 series racks for real‑time diagnostics.
Field Installation Guidelines
Mounting: Install firmly on machine casing to ensure mechanical coupling.
Cable Routing: Keep sensor cabling away from high‑voltage lines to minimize induced noise.
Shielding: Ground cable shields at the monitoring end only.
Verification: Confirm sensitivity calibration (100 mV/in/s) during commissioning.
Maintenance: Inspect connectors periodically for secure engagement and signs of wear.
