Bently Nevada 330500 Velomitor Piezo-velocity Sensor

Configured for absolute casing vibration measurement in machinery monitoring systems, the Bently Nevada 330500-06-00 (330500 Velomitor Piezo-velocity Sensor) converts mechanical vibration into an electrical output proportional to vibration velocity. Its piezoelectric sensing element and integrated electronics support vibration measurement on bearing housings, machine casings, and structural components. The sensor provides a nominal sensitivity of 100 mV/in/s and a peak measurement range up to 50 in/s.

Suffix Breakdown & Model Matrix

• 330500: Base model designation for the Velomitor Piezo-velocity Sensor.
• -06-00: Configuration suffix supplied in the provided reference data. The mounting thread and agency approval interpretations require confirmation against the manufacturer's ordering documentation.

Hardware Specifications

Vibration Signal Characteristics and TSI Integration

The 330500 measures absolute vibration velocity relative to free space. Unlike an eddy-current proximity probe, which measures relative shaft displacement and uses a DC gap voltage for probe-gap validation, this sensor measures casing or housing vibration through a piezoelectric sensing element.

For machinery monitoring, the sensor output must be connected to a compatible vibration monitoring input. Confirm input sensitivity, signal conditioning, frequency response, and connector wiring before connecting the sensor to a monitoring channel. Do not apply eddy-current probe gap-voltage criteria to this velocity sensor.

The supplied specifications identify a nominal sensitivity of 100 mV/in/s, a negative DC output bias, and a maximum stated cable length of 305 m. Verify the complete signal-chain requirements against the applicable Bently Nevada documentation before commissioning.

Frequently Asked Questions (FAQ)

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 is the specified sensitivity of the 330500?

A: The supplied data specifies 100 mV/in/s, equivalent to approximately 3.94 mV/mm/s, with a tolerance of +/- 5% under the stated reference conditions.

Q: Can the sensor connect directly to any vibration monitoring input?

A: Compatibility cannot be assumed. Confirm input sensitivity, bias-voltage handling, connector pinout, and signal-conditioning requirements for the receiving monitor before connection.

Field Installation Guidelines

1. Verify the full model number, mounting thread, connector type, and applicable manufacturer installation documentation before installation.
2. Mount the sensor on a clean, flat, rigid surface. Ensure the mounting interface provides firm mechanical contact with the machine casing or bearing housing.
3. Apply the specified mounting torque only after confirming the correct value and thread configuration in the applicable manufacturer's documentation.
4. Route sensor cables separately from high-current power conductors and sources of electromagnetic interference where practical. Avoid sharp bends, excessive tension, and mechanical abrasion.
5. Verify connector pin assignments and the monitoring system's electrical input requirements before energizing the measurement circuit.
6. Confirm the vibration monitoring channel's engineering units, sensitivity scaling, frequency range, and signal conditioning during commissioning.
7. Inspect cable shielding and grounding arrangements against the sensor and monitor installation manuals. Avoid creating unintended ground loops.
8. Check the installed sensor's output and compare it with an appropriate reference measurement before using the channel for machinery condition assessment.