Tokyo Keiki KRG-10, User Manual

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2-11
2.8 Pipe installation
Microwave can propagate only inside of metal pipe. Following features are for the application for pipe
installation.
･
It can use existing metal pipe without replacement.
･
It will not be affected by any obstacle reflection disturbance outside of the pipe.
･
The deterioration of the signal is much smaller than free space propagation. Thus even low
dielectric constant liquid may have longer measurable range.
･
Pipe can be used as stilling well against turbulence.
NOTE:
･
Antenna should be selected 4” or 2” cone antenna type.
･
Pipe material should be metal.
･
Pipe length should cover all measuring range.
･
The gap between antenna outer diameter and pipe inner diameter should be less than 2 mm.
･
Air vent hole (approx. 5mm-10mm) must be positioned above maximum liquid level.
･
Low dielectric constant liquid may require to attach bottom reflection plate as Fig. 2.2.12.
･
In case target liquid is non-homogeneous characteristic or has multiple layer, some of slits may be
required for mixing each in and out side liquid. Those slits should be less than 5mm and positioned
right-angled against “
E
”.
･
In case target liquid has high viscosity, periodical cleaning maintenance may be required.
･
In case the pipe will have strong stress, pipe should be fixed to wall or protection arm.
･
Inside pipe, between flange connections or welding requires smooth finish.
100 %
0 %
Stirring hole
Air vent hole
Reflector
View A-A
A
A
Air vent hole
Fig. 2.8.1 Pipe installation