Product Overview

The Bently Nevada 330500-04-00 is a specialized Velomitor Piezo-velocity Sensor engineered to measure absolute casing vibration. By utilizing an internal integrating circuit, this piezoelectric accelerometer converts acceleration into a velocity signal, providing a more reliable and durable alternative to traditional moving-coil velocity transducers. Its solid-state architecture contains no moving parts, effectively eliminating the mechanical wear and sticking issues that can compromise data integrity over time. Designed for high-stakes industrial environments, the 330500 series is a core component of Turbine Supervisory Instrumentation (TSI), allowing for the continuous assessment of machinery health through bearing housing and structural component monitoring.

Key Technical Characteristics

This vibration sensor is characterized by its wide frequency range and rugged construction, making it suitable for a broad spectrum of rotating machinery.

• Model Identification 330500-04-00

• 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 1/4-28 UNF (Option -04)

• Agency Approvals Multiple international certifications including ATEX, IECEx, and CSA (Option -00)

• Temperature Range -51°C to +121°C (-60°F to +250°F)

• Housing Material 316L Stainless Steel, hermetically sealed

• Connector Type 2-pin MIL-C-5015 top-exit interface

• Shock Survivability 49,000 $m/s^2$ (5,000 g) peak maximum

Industrial Applications and Use Cases

The 330500-04-00 Velomitor is widely deployed across the power generation, oil and gas, and wastewater treatment sectors. Its ability to be mounted in any orientation—vertical, horizontal, or at a specific angle—makes it highly versatile for complex equipment geometries.

Primary use cases include:

• Centrifugal Compressors Monitoring for rotor unbalance and aerodynamic instability.

• Steam and Gas Turbines Detecting mechanical looseness or misalignment in high-speed turbine stages.

• Large Pumps and Motors Providing the vibration data required for predictive maintenance on critical balance-of-plant assets.

• Cooling Tower Fans Monitoring structural vibration and gearbox health in high-humidity environments.

By integrating the 330500-04-00 with Bently Nevada 3500/42M or 1900/65A monitors, plant operators can establish automated machinery protection loops that trigger alarms or shutdowns before catastrophic failure occurs, significantly enhancing operational safety.