Chapter 4 Transducer installation
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method, Z method and N method. The V method is primarily used on small
diameter pipes (DN100~300mm, 4
〞
~12
〞
). The Z method is used in
applications where the V method cannot work due to poor signal or no signal
detected. In addition, the Z method generally works better on larger diameter
pipes (over DN300mm, 12
〞
) or cast iron pipes.
The N method is an uncommonly used method. It is used on smaller diameter
pipes (below DN50mm, 2
〞
).
4.1.3. V method
The V method is considered as the standard method. It usually gives a more
accurate reading and is used on pipe diameters ranging from 25mm to 400mm
(1
＂
~16
〞
) approximately. Also, it is convenient to use, but still requires proper
installation of the transducers, contact on the pipe at the pipe’s centerline and
equal spacing on either side of the centerline.
4.1.4. Z method
The signal transmitted in a Z method installation has less attenuation than a signal
transmitted with the V method when the pipes are too large, there are some
suspended solid in the fluid, or the scaling and liner are too thick .This is because
the Z method utilizes a directly transmitted (rather than reflected) signal which
transverses the liquid only once.
The Z method is able to measure on pipe diameters ranging from 100mm to
800mm (4
〞
~32
〞
) approximately. Therefore, we recommend the Z method for
pipe diameters over 300mm (12
〞
).
