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Working Principle
The flowmeter consists of a float inside a conical tube.
The rising flow pushes the float to an equilibrium point.
The area obtained between the float and the orifice is
proportional to the flow rate.
This type of measuring principle is known as variable
area.
The equilibrium point depends on :
The float weight
The fluid thrust :
The free flow area :
The area proportional to the flow rate will be:
where:
Ac = Flow measuring tube area
Af = Float area
Each position of the float corresponds to a flow rate
indicated on the scale printed on measuring tube.
n.
Part
1
Body
2
M. Tube clamp
3
O-ring
4
End gasket
5
Top spring
6
Float
7
Measuring Tube
8
Bottom spring
Transparent
9
protection
10
Screw
2
:
Al = Ac - Af
Materials
EN 1.4404
EN 1.4404
NBR
NBR
EN 1.4401
EN 1.4404 /
Glass / Ceramic /
Hostalen
Borosilicate Glass
EN 1.4401
Metacryilate
Nylon ®
Pf
E
Al
Reading
line (see
page
3)
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