Product Overview

The Bently Nevada 190501-07-00-04 is a high-precision Velomitor CT (Cooling Tower) velocity transducer specifically calibrated for seismic vibration monitoring of low-speed rotating machinery. While standard velocity sensors often lose accuracy at lower frequencies, the Velomitor CT is engineered to capture casing vibration on equipment operating as low as 90 RPM. This makes it the industry standard for monitoring large-diameter fans in cooling towers and air-cooled heat exchangers (fin-fans).

This transducer utilizes solid-state piezoelectric technology to convert vibration velocity into an electrical signal. Unlike moving-coil sensors, it has no internal moving parts to wear out, ensuring a long service life in the high-humidity, corrosive environments typical of cooling tower applications. The 190501-07-00-04 configuration features a 3/8-24 UNF mounting stud and is designed for seamless integration with Bently Nevada 3500 and 2300 monitoring systems.

Technical Specifications

• Manufacturer: Bently Nevada (Baker Hughes)

• Model Identification: 190501-07-00-04

• Transducer Type: Piezo-velocity (Solid-state)

• Mounting Thread: 3/8-24 UNF

• Frequency Response: 1.5 Hz to 1.0 kHz (90 to 60,000 cpm) ±3.0 dB

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

• Velocity Range: 127 mm/s (5.0 in/s) peak

• Electrical Connector: 2-pin MIL-C-5015

• Housing Material: 316L Stainless Steel

• Hazardous Area Approvals: ATEX, IECEx, CSA (Class I, Div 1/Zone 0)

• Operating Temperature: -40°C to +85°C

• Dimentions:1.8x1.6x12.3 cm
  

Key Operational Characteristics

• Low-Frequency Accuracy: Optimized specifically for the 100 to 300 RPM range, providing reliable data for imbalance and mechanical looseness detection in slow-speed fan blades.

• Broad Spectrum Monitoring: Captures not only the primary fan vibration but also the higher-frequency mechanical signatures produced by the motor bearings and speed-reducing gearboxes.

• Hermetic Reliability: The 316L stainless steel enclosure is hermetically sealed to prevent moisture ingress, essential for longevity when mounted directly in the cooling tower’s "wet" exhaust air stream.

• Explosion-Proof Certification: Fully certified for use in Class I, Division 1 and Zone 0 hazardous locations, making it suitable for volatile environments in oil refineries and chemical plants.

• Simplified Installation: The MIL-C-5015 connector interface allows for quick disconnection and replacement during maintenance cycles without rewiring the entire signal path.

Industrial Applications

The 190501-07-00-04 is a critical component for predictive maintenance and machinery protection in the following assets:

• Cooling Tower Fan Drives

• Air-Cooled Heat Exchangers (Fin-Fans)

• Large Diameter HVAC Fans

• Low-Speed Agitators and Industrial Mixers