EMERGENT EES-101, Инструкция по эксплуатации, Страница: 14 / 65

EES-101 Series Ultrasonic Flowmeter
Revision: 3.0.1 Page 14 of 65
3 Measurement Site Selection
When selecting a measurement site, it is important to select an area where the fluid flow profile is fully developed
(achieved laminar flow)
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.
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 free of
excessive corrosion or scaling.
This is especially applicable on galvanized rigid piping that might have
significant rust on the inside of the pipe.
10
D
m
in
L
≥
10D
L ≥ 5D
10D min
10
D
m
in
L
≥
50D
L ≥ 10D
L ≥ 30D
D
5D min
0
.5
D
m
in
L
≥
5D
L ≥ 10D
L ≥ 5D
L ≥ 50D
P
L ≥ 30D
L ≥ 10D
Straight length of Upstream
piping
Name
Straight length of Downstream
piping
Pump
Value
Diffuser
Tee
90
o
bend
Reducer
Detector
Flow controlled downstream Flow controlled upstream
Check Value
Check Value