Product Overview

The 190501-09-99-05 is a high-precision piezo-velocity sensor belonging to the specialized Velomitor CT (Cooling Tower) series. This transducer is specifically engineered to address the challenges of monitoring low-speed rotating machinery, where standard velocity sensors often lack the necessary sensitivity. By converting mechanical vibration into a proportional electrical voltage, it provides the essential data required for Turbine Supervisory Instrumentation (TSI) and predictive maintenance programs. The unit is designed to withstand the saturated, corrosive environments typical of industrial cooling towers, ensuring long-term structural monitoring of fan assemblies and drive trains.

Key Technical Characteristics

The Velomitor CT utilizes solid-state electronics to provide a clean, integrated velocity signal without the moving parts found in traditional moving-coil transducers.

• Model Number 190501-09-99-05

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

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

• Amplitude Linearity ±2% up to 63.5 mm/s (2.5 in/s) peak

• Transverse Sensitivity Less than 5% of axial sensitivity

• Integrated Cable 32-foot (approx. 9.7 meter) lead length (Option -09)

• Mounting Interface Plate stud adapter (3/8-24 to 1/4-inch NPT)

• Environmental Rating Hermetically sealed for high-moisture/mist exposure

• Approvals Multiple hazardous area certifications (Option -05)

• Operating Temperature -40°C to +85°C (-40°F to +185°F)

Operational Use Cases and Industrial Applications

The 190501-09-99-05 is primarily deployed in the power generation and petrochemical sectors for the protection of large-scale cooling tower fans and air-cooled heat exchangers. Because these fans typically operate at low rotational speeds (90 to 300 RPM), they generate vibration frequencies that are too low for standard Velomitor sensors. The CT (Cooling Tower) variant is uniquely tuned to capture these low-frequency signatures, allowing for the early detection of:

• Blade Unbalance: Identifying mass distribution issues before they cause structural damage to the fan stack.

• Gearbox Degradation: Monitoring gear mesh frequencies and bearing health within the speed reduction unit.

• Shaft Misalignment: Detecting stresses between the drive motor and the fan gearbox.

• Mechanical Looseness: Tracking shifts in structural integrity caused by loose mounting hardware or base degradation.

By integrating this transducer with a Bently Nevada 3500/42M monitor or a 1900/65A distributed protector, facilities can implement automated shutdown logic to prevent catastrophic fan failure and minimize expensive unplanned downtime.