Ratio of common flow Q3 to minimum flow Q1.
The flow characteristics of ultrasonic water meter are determined by Q1, Q2, Q3 and Q4, according to the common flow rate Q3 (to m3/h is the unit) and the ratio of Q3 to the minimum flow Q1. Q3 ranges from 1, 1.6, 2.5, 4, 6.3, 10, 16, 25, 40, 63, 100, ...
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