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Configured for seismic vibration monitoring in machine protection platforms, the Bently Nevada 330500-02-05 (330500-02-05 Piezo-velocity Sensor) provides direct physical execution of acceleration-to-velocity signal conversion.

Suffix Breakdown & Model Matrix

  • 330500: Velomitor Piezo-velocity Sensor base model.
  • 02: M8 x 1 mounting thread adapter option.
  • 05: Multiple agency approval option (CSA, ATEX).

Hardware Specifications

Parameter Specification
Model 330500-02-05
Brand Bently Nevada
Origin USA
Dimensions 63.2 mm height, 25.3 mm diameter
Operating Temp -55 deg C to +121 deg C
Power Consumption Loop-powered via vibration monitor
Sensitivity 3.94 mV/mm/s (100 mV/in/s) +/- 5%

Mechanical Monitoring and Rotor Dynamics

The 330500-02-05 sensor utilizes a piezoelectric element to convert casing acceleration into a velocity-proportional output. Unlike eddy-current probes that require gap voltage validation (-10 VDC targets) to determine shaft position, this sensor outputs a continuous signal reflecting seismic intensity. Maintaining signal integrity requires rigorous cross-talk suppression; interface cabling must be shielded to prevent electromagnetic noise induction from peripheral high-power AC lines. The case-isolated design minimizes ground loop susceptibility, and the 316L stainless steel shell ensures structural integrity in harsh industrial environments.

Frequently Asked Questions

Q: What is the significance of the 46 kg cm mounting torque specification?

A: The mounting torque is critical for ensuring a rigid mechanical coupling between the transducer base and the machine casing. Under-torquing leads to high-frequency attenuation and resonance errors, while exceeding 46 kg cm may deform the M8 x 1 threaded interface.

Q: Is this sensor compatible with hazardous area installations?

A: Yes, the -05 suffix indicates multiple agency approvals, including CSA and ATEX. Verify all safety barriers and wiring requirements per the specific installation manual for the designated hazardous zone.

Field Installation Guidelines

  1. Machine the mounting surface to a flat, smooth finish to ensure a rigid, full-contact interface for the M8 x 1 mounting stud.
  2. Apply a thin layer of light machine oil or silicone grease to the transducer base to facilitate high-frequency energy transfer.
  3. Tighten the sensor into the mounting hole until the base is fully seated against the casing, not exceeding the 46 kg cm torque limit.
  4. Route the 2-pin Mil-C-5015 cable away from high-current AC leads and variable frequency drive outputs to minimize potential electromagnetic noise.
  5. Verify the bias voltage at the monitoring system input terminals to confirm the sensor is correctly energized prior to machine startup.

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