Configured for casing vibration velocity measurement in Bently Nevada machinery monitoring systems, the Bently Nevada 330500-06-00 (330500 Velomitor Piezo-velocity Sensor) provides direct electrical conversion of mechanical vibration into a conditioned velocity output through integrated piezoelectric electronics. The sensor eliminates moving-coil elements while maintaining a velocity-based output for machinery vibration monitoring.
Suffix Breakdown & Model Matrix
Suffix
Description
330500
Velomitor Piezo-velocity Sensor base model
-06
M8 x 1.25 mounting thread
-00
Standard version without additional agency approval option
Hardware Specifications
Parameter
Specification
Model
330500-06-00
Brand
Bently Nevada
Weight
Approx. 142 g
Dimensions
Not specified
Operating Temp
-54 deg C to +121 deg C
Power Consumption
Current-regulated supply, 15 VDC to 30 VDC
Sensor Type
Piezo-velocity sensor
Output Sensitivity
3.94 mV/mm/s (100 mV/in/s) +/- 5 % at 100 Hz
Frequency Response
4.5 Hz to 5000 Hz (+/- 3 dB); 6 Hz to 2500 Hz (+/- 0.9 dB)
2-pin MIL-C-5015 top connector with gold-plated pins
Mounting Torque
Maximum 4.5 N.m
Rotor Dynamics Signal Integrity
The 330500 Velomitor sensor is intended for machinery casing vibration measurement rather than shaft relative displacement. Its integrated piezoelectric electronics generate a conditioned velocity output while suppressing the mechanical wear associated with moving-coil transducers. Within Bently Nevada vibration monitoring systems, velocity data may be evaluated alongside eddy-current proximity probe measurements to support rotor dynamics analysis. Gap voltage validation for proximity probes, commonly referenced near -10 VDC during probe setup, remains a separate commissioning procedure and does not apply to the electrical output of the Velomitor sensor.
Frequently Asked Questions
Q: Does the sensor require an external signal conditioner? A: No. The sensor contains integrated piezoelectric electronics and produces a conditioned velocity output when supplied with a regulated 15 VDC to 30 VDC excitation source.
Q: Can the sensor be hot-swapped while the monitoring channel is energized? A: The supplied documentation does not specify hot-swap capability. Follow the monitoring system maintenance procedure before disconnecting or replacing the sensor.
Q: Is the sensor intended for shaft displacement measurement? A: No. The device measures machine casing vibration velocity. Shaft displacement measurements require compatible eddy-current proximity probe systems.
Field Installation Guidelines
Install the sensor on a flat, clean mounting surface to maintain mechanical coupling.
Apply the specified maximum mounting torque of 4.5 N.m to the M8 x 1.25 mounting stud.
Route sensor cables separately from high-power motor and switching cables to minimize electromagnetic interference.
Maintain connector cleanliness and ensure the hermetically sealed connector is fully engaged before energizing the monitoring circuit.
Verify the available excitation supply is within the specified 15 VDC to 30 VDC operating range before commissioning.
Inspect cable shielding and grounding practices according to the monitoring system installation standard to reduce electrical noise.
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