AVFM 5.0 Area Velocity Meter.jpg

Measures Velocity and Level with an Ultrasonic Sensor

Monitor flow through open channels, partially full sewer pipes and surcharged pipes without a flume or weir. Ideal for municipal stormwater, combined effluent, raw sewage and irrigation water.

The AVFM 5.0 uses a submerged ultrasonic sensor to continuously measure both Velocity and Level in the channel. The sensor resists fouling, corrosion and abrasion. The flowmeter can be configured with the standard submerged velocity-level sensor, or with submerged velocity plus a separate non-contacting ultrasonic level sensor.

View flow rate and total flow on the large backlit LCD display and connect to external devices with three 4-20mA outputs and two control relays.

Easy to Use

The AVFM 5.0 Area-Velocity Flow Meter measures both Level and Velocity to calculate flow in an open channel or pipe. Calibration is simple: enter the pipe diameter or channel dimensions and the AVFM 5.0 automatically computes and displays flow volume.

The ultrasonic sensor mounts inside the pipe or on the bottom of a channel with a stainless steel mounting bracket (included) and a single screw into the bottom of the pipe or channel. No special compounds, tools or hardware are required. The sensor is completely sealed with no orifices or ports.

Recommended Pipe or Channel Conditions

Careful selection of sensor mounting location results in best performance and maintenance-free operation. Avoid locations where sediment builds up.


  • No Flume or Weir required

  • Works in partially filled and surcharged pipes

  • Use in pipes and channels of any shape, 6" up to 10 ft

  • Measures forward flows 0.1 to 20 ft/s, reverse flows up to 5 ft/s

  • On-screen flow reports

  • 4-20 mA output / programmable relays

  • Accurate, reliable and verifiable

  • Optional 2 million point data logger with USB output