Product Overview

The Bently Nevada 190501-02-00-04 is a specialized piezoelectric velocity sensor engineered for the seismic monitoring of low-speed rotating machinery. As a core component of the Velomitor CT (Cooling Tower) series, this transducer is specifically optimized to detect vibration in assets where operating speeds are as low as 90 RPM. Unlike standard accelerometers, the 190501-02-00-04 integrates internal solid-state electronics to provide a velocity-output signal, making it more effective at capturing the mechanical health of fan assemblies, gearboxes, and motors in cooling tower environments. This unit features global hazardous area certifications, ensuring reliable performance in volatile industrial settings.

Key Technical Characteristics

The 190501-02-00-04 is designed for ruggedness and high-fidelity signal transmission at low frequencies. This specific configuration includes the 3/8-24 to 1/2-20 mounting stud and comprehensive global approvals.

• Model Number 190501-02-00-04

• Transducer Type Piezo-velocity (Internal Integration)

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

• Frequency Response 3.0 Hz to 900 Hz (180 to 54,000 cpm) ±3.0 dB

• Mounting Option 3/8-in 24 to 1/2-in 20 Stud (Option -02)

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

• Hazardous Area Ratings ATEX/IECEx/CSA Zone 0/1, Class I Division 1 (Option -04)

• Dynamic Output Impedance Less than 400 Ω

• Casing Material 316L Stainless Steel

• Environmental Rating Hermetically sealed

Operational Use Cases and Industrial Applications

The Velomitor CT is the industry standard for monitoring the structural vibration of cooling tower fan decks and air-cooled heat exchangers (fin-fans). Its frequency range is tailored to identify specific faults in low-speed machinery:

• Cooling Tower Fan Monitoring Designed to track vibration on fans operating between 100 and 300 RPM, identifying blade unbalance and misalignment.

• Speed Reducer and Gearbox Analysis Capturing higher-frequency gear mesh signatures and bearing faults in the fan drive train.

• Air-Cooled Heat Exchangers (ACHE) Continuous seismic monitoring to prevent catastrophic fan failure and structural damage.

• Hazardous Process Zones Implementation in refineries and chemical plants where Class I Div 1 or ATEX Zone 0 certifications are required for explosive atmospheres.

• Turbine Supervisory Instrumentation (TSI) Integration into Bently Nevada 3500/42M or 1900/65A monitors for automated alarm and machinery shutdown logic.

By measuring absolute casing vibration, the 190501-02-00-04 provides plant operators with the early warning data needed to schedule maintenance before unplanned downtime occurs, significantly extending the lifecycle of low-speed assets.