Figure 3: Typical time series results of transit-time flow
measurement for various bentonite concentrations.
The validation was carried out by a comparison between the measurement
made by the device under test and that by a reference method. In this
study, the reference readings were acquired by the ‘static method’ based
on collecting fluid in a volumetric tank and determining its quantity by
a static measurement (measuring the change in fluid level in tank).
Figure 4 shows a scattered plot for the transit-time ultrasonic flow
meter reading versus the actual flow measured by the volume tank. As
expected, the scattered points show a positive linear pattern as they
move from left to right. Transit-time ultrasonic flow meter exhibits
good linearity, giving a predictable response for a known change in the
flow rate. The Pearson coefficient R is 0.9529 indicating a strong
positive correlation.