Monitor flow through partially filled pipes or large open channels with irregular flow profiles. This AVMS 5.1 flowmeter is designed for municipal storm water, combined effluent, raw sewage and irrigation water. The flowmeter uses three submerged ultrasonic sensors to continuously measure velocity at different points in the channel and provide an average velocity reading for flow monitoring. One of the three sensors can also monitor the water level or a separate non-contacting ultrasonic level sensor can be used in the system. The unit can be calibrated to channels of any shape. The sensors are resistant to fouling and corrosion. It measures forward and reverse flow, includes a backlit flow rate display, totalizer, three 4-20mA outputs and two control relays. A built-in data logger is optional.