Product Description:

The 190501-02-00-CN Velomitor CT Velocity Transducer is a low-frequency piezoelectric velocity sensor specifically designed for measuring the vibration velocity of cooling tower and air-cooled heat exchanger fan units. The Velomitor CT velocity sensor is a low-frequency derivative of the standard Velomitor piezoelectric velocity sensor. Its design is specifically tailored for monitoring the vibration velocity of cooling tower and air-cooled heat exchanger fan units, which typically operate at speeds not lower than 90 RPM (common range 100–300 RPM). This sensor can not only measure the vibration amplitude in the aforementioned low-frequency range but also effectively capture the vibration frequency components generated by the fan motor and gearbox.

Frequently Asked Questions (FAQ)

Q:What makes the "CT" version different from a standard Velomitor?
A:The "CT" stands for Cooling Tower. Unlike the standard Bently Nevada 330500 Velomitor, the 190501 is optimized for low-frequency machinery. It tracks the unique low-speed vibration signatures generated by fans, fan motors, and speed reducers down to 90 RPM (1.5 Hz).
Q:What kind of cabling does the connection option require?
A:The -00 connection option features a standard 2-pin MIL-C-5015 top-connector. It pairs with a twisted, shielded two-wire cable (typically 20 AWG) where Pin A represents the positive signal and Pin B represents the return.

Q: How is this sensor calibrated?
A:Because it is a low-frequency sensor, it must be verified using a low-frequency portable vibration calibrator. Calibration is typically done by running a frequency sweep at slower cycles (e.g., 120, 180, 300, and 600 CPM) at a fixed target amplitude to ensure the output stays within its ±5% voltage tolerance.

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