Product Description:

The Bently Nevada 190501-11-00-01 is a specific configuration of the Velomitor CT (Cooling Tower) Velocity Transducer,  As a low-frequency adaptation of the standard Velomitor Piezo-velocity Sensor, this transducer is purpose-built for measuring casing vibration velocity on cooling tower and air-cooled heat-exchanger fan assemblies operating at rotational speeds of 90 rpm or higher, with typical applications falling within the 100 to 300 rpm range. In addition to accurately capturing vibration amplitudes at these low fundamental frequencies, the Velomitor CT Transducer is equally capable of detecting the higher-frequency vibration components generated by the fan motor and speed reducer, making it well-suited for low-speed rotating machinery where conventional vibration sensors fail to maintain accurate frequency response.

Frequently Asked Questions (FAQ)

Q:How does it differ from a standard 330500 Velomitor?
A:The 190501 CT is a low-frequency specialist variant. While the standard Bently Nevada 330500 works down to 4.5 Hz, the CT model maintains accuracy down to 1.5 Hz to 3.0 Hz, picking up the slow rotational frequencies typical of large industrial fans.
Q:What is the recommended mounting torque?
A:The sensor must be installed on a clean, flat 33 mm diameter surface. Tighten it to a mounting torque of 4.5 N-m ± 0.6 N-m (40 in-lbf ± 5 in-lbf). Improper torque or an uneven surface will distort high-frequency signals and lead to false data.

Q:Can this sensor be tested or calibrated in the field?
A:Yes. Because it is optimized for low frequencies, you can use specialized tools like a portable low-frequency shaker table to verify loop alerts and alarms down to 42 CPM (0.7 Hz) right at the machine site.

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