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SL1188P Ultrasonic transit-time flowmeter
Revision
:
2.0.0
Page
12
of
81
3.
Measurement Site Selection
When selecting a measurement site, it is important to select an area where the fluid flow profile is fully developed
to guarantee a highly accurate measurement. Use the following guidelines to select a proper installation site:
Choose a section of pipe that is always full of liquid, such as a vertical pipe with flow in the upward direction or a
full horizontal pipe.
Ensure enough straight pipe length at least equal to the figure shown below for the upstream and downstream
transducers installation.
Pump
Valve
Reduce
Diffuser
Tee
90
o
bend
Straight length of
downstream piping
Straight length of upstream
piping
Name
Detector
10
D
m
in
0
.5
D
m
in
L
≥
5D
L
≥
5D
L
≥
10D
Flow controlled downstream
10
D
m
in
L
≥
10D
L
≥
5D
L
≥
10D
10D min
L
≥
50D
L
≥
30D
D
5D min
L
≥
10D
L
≥
30D
Flow controlled upstream
L
≥
50D
P
Check valve
Stop valve