Rotameters are otherwise called variable region flow meters. Variable zone flow meters work by measuring the stream rate as the liquid goes through a decreased tube where the cross sectional region of the tube steadily gets to be more prominent as the liquid goes through the tube. The term rotameter originates from the early form of the buoys, which had spaces to balance out and focus them inside of the liquid stream. This made the buoys turn. Current buoy outlines are an assortment of shapes (round for instance) and are built of stainless steel, glass, metal, and plastic.
Principle of Rotameter:-
Whenever liquid or gas moves through a taper tube containing a buoy, a weight contrast of P1 and P2 is made in the middle of upper and lower side of the buoy. The buoy moves upwards by a power got by increasing the weight differential by the most extreme cross sectional range of the buoy.
Because of taper end of the tube, as the buoy moves upwards, the liquid passing zone increments as a consequence of which the differential weight diminishes. Upward development of buoy stops when the dead load is progressively adjusted by the differential weight. Decreasing of metering tube is designed to the point that the vertical development of the buoy turns out to be straightly corresponding to the rate of stream and the scale is given to peruse the position of the buoy, in this way bringing forth stream rate sign.
In light of Bemoulli's hypothesis, the standard said above can be hypothetically communicated as follows:
Advantages of Rotameter
Rotameter Selection Criteria:-
Rotameter Design Components:- The two basic components of every rotameter are:-
Tube sizes vary from 1/16 to 4 in., with a 1/8–2 in
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