Product Description:

The Bently Nevada 190501-20-00-01 is a Velomitor CT (Cooling Tower) Velocity Transducer.The 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:Why does my system show a roll-off or lower sensitivity at very low speeds?
A:As detailed in low-frequency calibration procedures, the piezoelectric sensor's internal amplifier inherently drops in output voltage below 3.0 Hz. If you test or run a fan near its absolute 90 CPM floor, expect a steep curve drop. Ensure your monitoring software’s scaling configuration factors in the official Bently Nevada Velomitor CT Datasheet response curves.
Q:How do I orient and mount this transducer?
A:The sensor can be installed in any physical orientation (vertical, horizontal, or inverted). The adapter must be torqued precisely to 4.5 N-m ± 0.6 N-m (40 in-lbf) onto a clean, flat surface with a minimum diameter of 33 mm. Improper torque or an uneven surface will distort high-frequency micro-vibrations and lead to false data.

Q:What kind of hazardous areas can this specific model be installed in?
A:The -01 suffix indicates that this unit possesses multiple global safety certifications. It is approved for use in explosive atmospheres under ATEX, IECEx, and CSA frameworks. This means it can be deployed within Zone 0/1 or Class I, Division 1 environments when paired with the proper intrinsic safety barriers.

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