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VA is the acronym for Variable Area. The instrument consists of a conical tube, in which a float is placed. The float is pushed upwards by the flowing medium. Because the tube is conical, the free space between float and tube wall becomes larger. There will be a balance at a certain point. The value on which a balance is created between the weight of the float and current can be read on a scale.
Normally, a VA meter is placed vertically with the flow direction upwards, but instruments are also provided with a spring, so that the meter can also be positioned horizontally or with the flow direction downwards.