7
TECHNICAL DATA
26
VA40 - VA45
www.krohne.com 08/2015 - 4000424402 - MA VA40-45 R04 en
7.1 Functional principle
The flowmeter operates with the principle of variable area flowmeters.
A glass cone is installed in the measuring unit of VA40/45, in which a suitably formed float can
move freely up and down.
The flowmeter is inserted into a vertical pipeline and the medium flows through it from bottom to
top.
The float adjusts itself so that the buoyancy force F1 acting on it, the flow resistance F2 and its
weight F3 are in equilibrium: F3 = F1 + F2
The height of the float in the measuring unit, which depends on the flow, is displayed on a scale.
The top edge of the float marks the reading line for flow values.
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