PFlow Industries P118i, Руководство пользователя

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P118i Ultrasonic Flowmeter and Analyzer
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Step 8. Display Measurement Results
Press to enter Menu 01 to
display flow rate. ( Subject to the real measurement. )
2.3
Measurement Site Selection
Compared with other kinds of flowmeters, Ultrasonic Flowmeter is the simplest one to install. Choose a proper
measurement site, enter the pipe
’
s parameters into the flowmeter. Install and fix the transducers on the pipe as
instructed by the meter and start the measurement.
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:
l
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.
l
Ensure enough straight pipe length at least equal to the figure shown below for the upstream and downstream
transducers installation.
l
On the horizontal pipe, the transducer should be mounted on the 3 o
’
clock and 9 o
’
clock position of the pipe
section, avoid the 6 o
’
clock and 12 o
’
clock position, in order to avoid the signal attenuation caused by the
sediment at the bottom, or air bubbles or cavitation.
l
Ensure that the pipe surface temperature at the measuring point is within the transducer temperature limits.
l
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.
l
Choose a section of sound conducting pipe.