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How To Read The Flowrate (Glass Tube Flowmeters)

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Different types and designs of float are used for glass tube variable area flowmeters.
The reading positions by float are specified by Standard and in Japan, JIS B7551 "Float type Variable Area Flowmeters" governs in which the following description is shown;

JIS B7551

7.2 Positions for reading of scale on movable part
As regards the direct indication style flowmeter, the scale and movable part shall be so constituted as to be capable of reading the scale at the positions of the arrow marks of Fig. 4.

(a) Transparent tapered-pipe type
Fig. 4. Positions for reading of scale on movable part

In our actual products, the following types of float are used and their reading points are as follows (position of Arrow)

Reading points