Transducers Installation - Am Instru Q-FP 201 User Manual

INSTRU Q-FP 201
10
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An optimum location would be defined as a straight pipe length full of liquid that is to be measured.
The piping can be in vertical or horizontal position. The following table shows
Piping Configuration
Transducer Position
----0.--
E><
1
/
YI
Examples of optimum locations.
Principles to selection of an optimum location
Install the transducers on a longer length of the straight pipe. The longer the better, and make
(1)
sure that the pipe is completely full of liquid.
Make sure that the temperature on the location does not exceed the range for the transducers.
(2)
Generally speaking, the closer to the room temperature, the better.
Take the pipe fouling into consideration. Select a straight length of a relatively newer pipe. If
(3)
the condition is not satisfying, consider the fouling thickness as part of the liner for a better
result.
Some pipes have a kind of plastic liner, and between the outer pipe and the liner there may be a
(4)
certain thickness difference that will prevent the ultrasonic waves from direct traveling. Such
conditions will make the measurement very difficult. Whenever possible, try to avoid this kind
of pipes. If impossible, try our plug-in transducers that are installed permanently on the pipe by
drilling holes on the pipe while liquid is running inside.
§2.7 Transducers Installation
The transducers used by the
crystals both for transmitting and receiving ultrasonic signals through the wall of liquid piping
system. The measurement is realized by measuring the traveling time difference of the ultrasonic
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Dr. R. Bielsa 175 (ex Morlote) C1427AZA Buenos Aires, Argentina. Tel.: (54111) 4555-0055 / Fax: (5411) 4555-0044
Handheld Ultrasonic Flowmeter
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Downstream
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Dimension
Dimension
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12D 5D
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30D
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