# Measurement Principle and Design Applications

## **Measurement Principle**

<figure><img src="/files/ZV1UPMGQUlqteSltpwqt" alt=""><figcaption></figcaption></figure>

LORRIC’s paddlewheel flow meter with it’s Axlesense technology can detect paddle rotation as short as 3 degrees. In addition, Axlesense technology enables the flowmeter to provide accurate measurement results even under 0.3 m/s flow speeds with a faster response time. Also, our flowmeter has the best in class linearity of 0.5% FS.

In addition to a faster response, LORRIC’s Axlesense technology allows for bi-directional measurement. The flows’ direction can be determined by the positive and negative signs.

{% hint style="info" %}
Due to inevitable friction between the paddlewheel and shaft, the minimum detectable flow speed is 0.1m/s. Therefore, when displayed data is zero, there may exist some slowly moving flow in the pipe.
{% endhint %}

The measurement method of LORRIC’s paddle wheel flowmeter is magnetism and paddle’s rotation. The solid foreign matters, magnetic substance, crystalloid, and water hammer should be avoided. Meanwhile, there should not be any interference by strong magnetic fields around the flowmeter.

Solid foreign matters, magnetic substance, crystalloid, and water hammer may cause paddle wheel stuck and shorten its life. Another feature of AxleSense technology is providing an alarm when paddle wheel is damaged or lost by external force or abrasion.

Please remove anything with a strong magnetic field around the paddle wheel flowmeter which may cause incorrect flow volume measurement or no rotation of the paddle wheel.

{% hint style="info" %}
There is a gap between paddle and shaft which was designed by us on purpose. Therefore, it is normal when the sound of paddle wheel rotation is getting louder by the increase of flow speed.
{% endhint %}


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