LRF-3000H Handheld Ultrasonic Flowmeter
- 10 -
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
10D
m
in
0
.5
D m
in
L
≥
5D
L
≥
5D
L
≥
10D
Flow controlled downstream
10D
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
Ensure that the pipe surface temperature at the measuring point is within the transducer temperature
limits.
Consider the inside condition of the pipe carefully. If possible, select a section of pipe where the inside is
