9
411d
Reading
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ABLE Instruments & Controls Ltd
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9Kamstrup A/S • 55121739_A3_GB_04.2016
MULTICAL® 403
3.2 Flow sensor position
A Recommended flow sensor position.
B Recommended flow sensor position.
C Unacceptable position due to risk of air
build-up.
D Acceptable position in closed systems.
E A flow sensor ought not to be placed
immediately after a valve, with the
exception of block valves (ball valve type)
which must be fully open when not used for
blocking.
F A flow sensor must never be placed on the
inlet side of a pump.
G A flow sensor ought not to be placed after a
double bend in two planes.
E
F
G
B
C
D
A
In order to avoid cavitation, the back pressure at the flow sensor (the pressure at the flow sensor
outlet) must be minimum 1.5 bar at q
p
(nominal flow) and minimum 2.5 bar at q
s
(maximum flow).
This applies to temperatures up to approx. 80 °C.
The flow sensor must not be exposed to lower pressure than ambient pressure (vacuum).
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