330500-06-00 Velomitor Piezo-velocity Sensor Bently Nevada

The Bently Nevada 330500-06-00, also cataloged as the 330500 Velomitor Piezo-velocity Sensor, measures absolute vibration velocity at machine casing and bearing housing locations. Its piezoelectric sensing element and integrated electronics convert mechanical vibration into an electrical output proportional to vibration velocity. The sensor is designed for machinery condition monitoring and vibration measurement in rotating equipment.

Hardware Specifications

Vibration Signal Characteristics and TSI Integration

The 330500 converts mechanical vibration into an electrical signal representing absolute vibration velocity. This differs from eddy-current proximity probes, which measure relative shaft displacement and require appropriate gap-voltage setup.

For machinery monitoring, the sensor mounting surface must provide firm mechanical coupling to the monitored casing or bearing housing. Surface flexibility, mounting looseness, and local structural resonance can affect the measured vibration response.

When integrating the sensor with a Bently Nevada machinery monitoring system, verify input sensitivity, bias-voltage compatibility, signal conditioning, and channel configuration against the receiving monitor's specifications. Do not apply eddy-current probe gap-voltage acceptance criteria to this piezoelectric velocity sensor.

Frequently Asked Questions

Q: Does the 330500 measure shaft displacement directly?

A: No. It measures absolute vibration velocity at the mounting location. Shaft-relative displacement measurement generally requires a compatible proximity probe system.

Q: What does the output bias voltage indicate?

A: The specified output bias is -12 VDC +/- 3.0 VDC, referenced to Pin A. Confirm the receiving monitor's input circuitry and wiring requirements before connecting the sensor.

Q: Can the sensor be installed in any orientation?

A: The supplied description states that the sensor can operate in different orientations. The installation must still provide a rigid mounting surface, secure mechanical attachment, and suitable cable routing.

Field Installation Guidelines

1. Prepare the mounting surface: Remove contamination and verify that the contact surface is suitable for rigid sensor coupling.
2. Verify the mounting interface: Confirm the actual sensor thread and mounting hardware before installation. Apply the manufacturer's specified torque without exceeding the stated maximum.
3. Connect the signal cable: Check connector compatibility, pin assignments, and cable condition. Protect the connector from moisture and mechanical strain.
4. Route the cable: Keep sensor wiring away from high-current conductors and strong electrical interference sources where practical. Avoid sharp bends, crushing, and unsupported cable sections.
5. Verify monitor compatibility: Confirm input sensitivity, bias-voltage handling, signal conditioning, and channel scaling using the receiving monitor documentation.
6. Validate the measurement: After installation, inspect the signal for abnormal noise, unstable readings, or indications of poor mechanical coupling.