Chapter 2 Starting Measurement
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(4) some pipes have a kind of plastic liner, and between the outer pipe and the liner
there may be a 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.
2.8 Transducers lnstallation
The transducers used by the SUP-2100H series ultrasonic flow meter are made of
piezoelectric 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 signals. since the difference is very small,
the spacing and the alignment of the transducers are critical factors to the accuracy
of the measurement and the performance of the system. Meticulous care should be
taken for the installation of the transducers.
steps to the installation of the transducers
(1) Locate an optimum position where the straight pipe length is sufficient, and
where pipes are in a favorable condition, e.g., newer pipes with no rust and ease of
operation.
(2) Clean any dust and rust. For abetter result, polishing the pipe with a sander is
strongly recommended.
(3) Apply adequate coupler to the spot where the transducers are to be installed
and leave no gap between the pipe surface and the transducers.
Extra care should be taken to avoid any sand or dust particles left between the pipe
outer surface and the transducers.
To avoid gas bubbles inside the upper part of the pipe, the transducers should be
installed horizontally by the side of the pipe.
2.8.1 Transducers spacing
The spacing value shown on menu window M25 refers to the distance of inner
spacing between the two transducers. The actual transducers spacing should be
as close as possible to the spacing value.
