Product Overview

The Bently Nevada 330500-04-04 is a high-precision, solid-state Velomitor sensor designed to measure absolute vibration velocity on rotating machinery. Unlike traditional moving-coil velocity transducers, this piezo-velocity sensor utilizes an internal integration circuit to convert acceleration into a velocity signal. This design eliminates moving parts, significantly reducing mechanical wear and allowing the sensor to be mounted in any spatial orientation—vertical, horizontal, or inverted. It serves as a critical interface for machinery protection systems, delivering high-fidelity data to monitor the health of bearing housings and structural casings.

Hardware Parameters

• Model Number: 330500-04-04

• Sensor Type: Piezo-velocity (Integrator-based)

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

• Frequency Response: 4.5 Hz to 5.0 kHz (±3.0 dB); 6.0 Hz to 2.5 kHz (±0.9 dB)

• Velocity Range: Up to 1270 mm/s (50 in/s) peak

• Transverse Sensitivity: Less than 5% of axial sensitivity

• Mounting Thread: 1/4-28 UNF (Option 04)

• Connector Type: 2-pin Mil-spec (Option 04)

• Construction: 316L Stainless Steel, hermetically sealed

• Hazardous Area Approvals: Multiple options including CSA, ATEX, and IECEx

Industrial Applications

The 330500-04-04 is primarily deployed in Turbine Supervisory Instrumentation (TSI) systems for the monitoring of large-scale rotating equipment. It is particularly effective for detecting unbalanced rotors, misalignment, and looseness in bearing supports. Common application sites include steam and gas turbine casings, centrifugal compressors, industrial pumps, and large electric motors. Its broad frequency range and immunity to mechanical degradation make it the industry standard for predictive maintenance in power plants, oil refineries, and chemical processing facilities.