A flowmeter is a device used to measure the speed of water. This tool calculates water velocity by relating the number of revolutions measured at a given time interval. For meteorology and hydrometers, Molina with series of blades are more useful. Blade rollers are suitable for measuring high speeds. There is a linear relationship between the velocity of water (v) and the number of revolutions of the Molina axis (n), which is as follows:


b: The hydraulic pitch of the flowmeter impeller (meters per round) obtained by the chariot test on the channel.

n: Impeller rotation (round per second)


a: Flowmeter constant (meters per second) obtained by the chariot movement test on the channel.


Moline calibration


The Flow Measurement Research Institute provides calibration and certification services for Molina meters. Periodic calibration ensures the reliability of the measured data. Certifications assist you in quality analysis processes and ensure traceability and controllable documentation.

Click to calibrate Molina flowmeter.