TF1100-EH transit-time handheld flowmeter manual
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2.7 TRANSDUCERS MOUNTING
The transducers used by the TF1100-EH 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 a better 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.
Take care 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.
2.7.2 TRANSDUCER MOUNTING MODE
Transducer Mounting Modes
V method
V-Mount
is the most widely used mode for daily measurement with pipe inner diameters
ranging from 20 millimeter to 300 millimeter. It is also called standard mode or method. But
if the meter displays error code or low signal strength and bad signal quality, for instance,
some old pipe etc., user should select
Z-Mount.
Z method
