Product Overview

The Bently Nevada 190501-11-00-00, also known as the Velomitor CT (Cooling Tower) Velocity Transducer, is a high-precision piezo-velocity sensor specifically engineered for low-speed rotating machinery. Unlike standard velocity sensors, the Velomitor CT is optimized to detect vibration on equipment operating at speeds as low as 90 rpm (1.5 Hz). It serves as a fundamental component of Turbine Supervisory Instrumentation (TSI), converting mechanical casing vibration into a high-fidelity electrical signal. This sensor is essential for monitoring the structural integrity of large-scale industrial assets where early detection of mechanical pathologies is required to prevent catastrophic failure.

Key Technical Characteristics

The 190501-11-00-00 is designed to operate in a two-wire loop configuration, providing a signal that is proportional to vibration velocity. The following parameters define its operational capabilities:

• Model Number 190501-11-00-00

• Sensitivity 3.94 mV/mm/s (100 mV/in/s) ±10%

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

• Velocity Range 1270 mm/s (50 in/s) peak velocity

• Power Requirement 24 VDC nominal (requires 12 to 30 VDC voltage source)

• Input Impedance Designed for integration with 3500/42M or 1900/65A monitors

• Case Material 316L stainless steel for maximum corrosion resistance

• Environmental Rating Hermetically sealed; suitable for high-humidity environments

• Connector Type 2-pin Mil-C-5015 top-exit connector

Industrial Applications and Operational Benefits

The primary application for the 190501-11-00-00 is the protection of cooling tower fans and heat exchanger air-coolers. Because these fans rotate at significantly lower speeds than turbines or pumps, standard sensors often fail to capture the low-frequency energy generated by a failing bearing or an unbalanced blade. The Velomitor CT overcomes this by providing a clean signal at the 1.5 Hz threshold.

By installing this sensor directly onto the fan gearbox or bearing housing, maintenance teams can track vibration trends that indicate misalignment, mechanical looseness, or gear mesh issues. When integrated into a 3500 Series Machinery Protection System, the 190501-11-00-00 provides the necessary data to trigger automatic shutdowns or alarms, effectively minimizing unplanned downtime and reducing maintenance costs in demanding petrochemical and power generation facilities.