Product Description:

The Bently Nevada 190501-04-00-01 is a specific configuration of the Velomitor CT (cooling tower) speed transmitter, a dedicated piezoelectric speed sensor designed specifically for low-frequency casing vibration measurement.The Velomitor CT speed transmitter is a low-frequency version of our standard Velomitor piezoelectric speed sensor. This product is specifically designed for measuring the casing vibration velocity of cooling towers and air-cooled heat exchanger fan assemblies at speeds not lower than 90 rpm (typically ranging from 100 to 300 rpm). The Velomitor CT transmitter can not only measure the vibration amplitude corresponding to the above speeds but also detect the vibration frequency generated by the fan motor and reducer.

Frequently Asked Questions (FAQ)

Q:Where is this sensor typically used?
A:This transducer is engineered specifically to measure casing vibration velocity on cooling towers and air-cooled heat-exchanger fan assemblies. It is ideal for machinery that operates at or above low rotational speeds of 90 RPM (typically ranging from 100 to 300 RPM).
Q:Can it measure both low and high-frequency components?
A:Yes. It tracks slow-moving low-frequency machinery anomalies (such as fan blade issues) alongside higher frequencies generated by the fan motor and speed reducer units.

Q:Does it require a specialized calibration procedure?
A:Yes. Because it is a low-frequency sensor, field calibration requires using a portable vibration calibrator capable of running a manual low-frequency sweep (e.g., testing at 120, 180, 300, and 600 cycles per minute). You must wait longer at low frequencies for the shaker to stabilize before exporting validation data.

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