Bently Nevada 330500-01-04 Velomitor Velocity Sensor

Rugged Velocity Transduction for Machinery Protection

The Bently Nevada 330500-01-04 Velomitor velocity sensor provides accurate casing vibration measurements for critical rotating equipment. This self-generating device requires no external power supply and produces a voltage output directly proportional to vibration velocity. Its stainless steel housing measures 63.5 mm in height and 38.1 mm in diameter, with a weight of approximately 280 grams. The sensor delivers a standard 100 mV/in/sec output signal for direct connection to vibration monitoring systems. This unit mounts on bearing housings, pump casings, and compressor frames for reliable condition assessment.

Frequency Response and Dynamic Range

This velocity sensor offers a frequency response from 10 Hz to 1 kHz with a sensitivity of 100 mV/in/sec ±5%. It handles a maximum vibration amplitude of 2.5 inches peak-to-peak, capturing both low-frequency rotor dynamics and high-frequency bearing defects. The internal moving coil design generates a voltage signal without requiring external excitation or amplification. The sensor operates reliably across temperatures from -30°C to +105°C, ensuring dependable performance in diverse environments. Such capabilities allow operators to detect unbalance, misalignment, and bearing deterioration at early stages.

Detailed Technical Specifications

Connector and Wiring Configuration

This sensor includes a two-pin MIL-style connector for robust field wiring and signal transmission. The housing features a 1/4-28 UNF mounting stud for direct attachment to machine surfaces or through mounting pads. Users can extend the wiring up to 300 meters using shielded twisted pair cable without compromising signal quality. The sensor stores no internal energy, making it intrinsically safe for hazardous area deployment. Operators can connect this unit directly to the Bently Nevada 3500 Monitoring System or any vibration input card accepting 100 mV/in/sec signals.

Installation and Service Considerations

Installing this velocity sensor requires only a 1/2-inch wrench and proper surface preparation for optimal mechanical coupling. The mounting stud requires a torque of 7-10 ft-lbs to ensure accurate vibration transfer from the machine casing. Routine inspections of the connector pins and cable integrity will maintain reliable signal transmission. This sensor requires no periodic recalibration, though users should verify output using a portable shaker table annually. The self-generating design eliminates external power wiring, simplifying installation and reducing potential failure points.