Tokyo Keiki UFL-30, Installation & Operation Manual

Page: 157 / 166

III- 48
2.5 Can waste water be measured?
From the standpoint of turbidity, there are no problems with measuring waste water inflows or
discharges. However pipe conditions in selecting measurement location should be carefully
considered as air bubbles are apt to be generated when there are drops or when measuring
locations are directly aft of pump discharge outlets.
2.6 Can measurements be made if solid particles or debris are present in the fluid?
The beam width (radiating width) of acoustic waves are sufficient to enable stable measurement in
the presence of small-sized solid particles in the fluid. In the case of large size debris which can
obstruct acoustic signals, the flowmeter has a discrimination function which can differentiate such
conditions from normal measurement values and ignore such data input. However when there is
continuous flow of fluid containing large volume of solid particles and debris, problems such as
mis-measurements or non-measurable conditions are apt to occur.
III-5-3. Pipes
3.1 What kind of pipe material enables ultrasonic measurement?
We have had numerous experiences with measurements through steel, stainless steel, cast iron,
ductile iron, and resins.
(1) Although we have measured through RC steel pipes, transmission of acoustic signals is difficult
and this type of pipe material is not conducive to ultrasonic measurement.
(2) Measurement through pipes of asbestos material is possible on rare occasions, but for all
practical purposes, measurement is not possible with this material.
(3) Hume pipes cannot be measured with sensors mounted on the outside of the pipe. Special
measurement methods incorporating sensors on the inside of the pipe are employed for this type of
application.
3.2 What are the minimum and maximum measurable pipe sizes?
Measurable diameters are from ø25mm to ø6000mm.
3.3 Is pipe lining a problem?
Mortar, epoxy and other common linings on the inside of pipes do not affect measurement. In
cases where the outside of pipes are wound with jute or similar material, remove this material at
the location where the sensors are to be positioned.