Product Description:

The 190501-18-99-04 Velomitor CT Velocity Transducer is a low-frequency version of our standard Velomitor Piezo-velocity Sensor. Its design specifically measures casing vibration velocity on cooling tower and air-cooled heat-exchanger fan assemblies that operate at or above 90 rpm (100 to 300 rpm typical).  The Velomitor CT Transducer can measure vibration amplitudes at these frequencies as well as the vibration frequencies generated by the fan motor and speed reducer.

Frequently Asked Questions (FAQ)

Q:Which machinery protection monitors are compatible?
A:This transducer interfaces seamlessly with standard industrial machinery protection systems. For newer setups using the Bently Nevada Orbit 60 Series, it is explicitly recommended to route the 190501 through a PAV (Positive Acceleration Velocity) module rather than a PVT module to properly manage its power limits.
Q:How do you calibrate or loop-test this low-frequency sensor?
A:Because it monitors assets at very low speeds, field testing cannot be performed with standard high-frequency shakers. It requires a dedicated low-frequency tool, such as a portable vibration calibrator capable of driving verification loops down to 42 CPM (cycles per minute). This ensures that your system's danger alerts and automated trip alarms are validated against actual low-speed faults.

Q:What makes the "CT" version different from a standard Velomitor?
A:The CT (Cooling Tower) variant features a frequency response adjusted downward to 1.5 Hz to 1.0 kHz. A standard Bently Nevada 330500 Velomitor is optimized for higher frequencies. This low-frequency optimization enables the 190501 to accurately measure low-speed fan rotations down to 90 rpm.

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