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Operating instructions for KME flow meter for compressed air and gases
3.4 Inlet and outlet measurement path
For measurement accuracy according to product specification, the KME flow meter shall be locat
-
ed as far as possible from flow disturbances caused for instance by pipe reductions or expan
-
sions, bends, T-pieces, valves or sliders. This can be accomplished by observing a minimum inlet
and outlet path length, which depends on both the nature of disturbance and the pipe diameter.
• The flowmeter shall be located before valves or sliders.
•
With light gases the inlet paths need to be extended.
Flow Direction
Pipe diameter (DN)
Outlet path
Inlet path
Flow direction
type
(DN = pipe diameter)
Inlet path
Outlet path
Extension
15 x DN
5 x DN
Reduction
15 x DN
5 x DN
90° elbow
20 x DN
5 x DN
Two 90° elbows, on
one level
25 x DN
5 x DN
Two 90° elbows, on
two levels, T-piece
30 x DN
5 x DN
Valve, slider
50 x DN
5 x DN
