Product Overview

The Bently Nevada 330500-02-02 is a high-precision Velomitor Piezo-Velocity Sensor designed to measure absolute casing vibration on rotating machinery. Unlike traditional moving-coil velocity transducers, this device utilizes specialized piezoelectric crystals combined with integrated solid-state electronics to convert acceleration into a velocity signal. This robust design eliminates moving parts, effectively preventing the mechanical wear and sticking common in legacy sensors. The 330500 series provides a critical data stream for Turbine Supervisory Instrumentation (TSI), allowing operators to monitor the vibration energy transmitted from the rotor to the bearing housing or machine structure.

Hardware Parameters

The 330500-02-02 is engineered for stability and longevity in demanding industrial environments. Its electrical and physical specifications include:

• Model Number 330500-02-02

• Transducer Type Piezoelectric velocity sensor (Solid-state)

• Sensitivity 3.94 mV/mm/s (100 mV/in/s) ±5%

• Frequency Response 4.5 Hz to 5.0 kHz (270 to 300,000 cpm) ±3.0 dB

• Mounting Thread M8 x 1.25 (Option -02)

• Agency Approvals Multiple hazardous area certifications including ATEX, IECEx, and CSA (Option -02)

• Dynamic Range 1270 mm/s (50 in/s) peak

• Temperature Range -40°C to +121°C (-40°F to +250°F)

• Enclosure Material 316L stainless steel, hermetically sealed

• Connector 2-pin Mil-C-5015 top-exit connector

Industrial Applications

This vibration sensor is a primary tool for predictive maintenance on a wide variety of rotating assets, including centrifugal compressors, steam turbines, pumps, and large industrial fans. Because the 330500-02-02 can be mounted at any angle—vertical, horizontal, or inclined—it offers significant installation flexibility for complex machinery trains. It is particularly effective at detecting:

• Rotor Unbalance Tracking the amplitude of the 1X vibration component.

• Shaft Misalignment Monitoring frequency harmonics that indicate axial or radial stress.

• Mechanical Looseness Identifying signatures of structural instability or loose bearing caps.

By integrating the 330500-02-02 into a Bently Nevada 3500/42M monitor or a 1900/65A protection system, plant personnel can implement reliable automated trip logic and trend analysis to prevent catastrophic machine failure and minimize unplanned outages.