Ultrasonic gas flow meter for upstream applications The innovative FLOWSIC600 DRU gas flow meter for upstream applications based on the FLOWSIC600. With a measuring range of up to 150:11, the FLOWSIC600 DRU also covers flow ranges that previously required several orifice plates. Low manufacturing tolerances and wet-gas tolerant ultrasonic sensors ensure consistently low measurement uncertainty, even under challenging conditions. SICK therefore makes it possible to skip the otherwise common cost-intensive high-pressure flow calibration. The FLOWSIC600 DRU enables real-time diagnostics of devices and processes and is virtually maintenance-free - even with high liquid loads.1 Increasing measurement uncertainty at flow speeds of less than 0.9 m/s.