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.