Greyline AVFM 6.1 Area Velocity Flow Meter

AVFM 6.1

Measure flow in open channels and partially filled pipes without requiring a flume or weir.

  • No flume or weir required
  • Programmable for custom channel shapes, pipe sizes
  • Submerged ultrasonic sensor measures flow, velocity and level
  • Large backlit LCD display
  • Onboard 26 million point data logger
  • Multiple signal outputs



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Product Details

Greyline AVFM 6.1 Area Velocity Flow Meter

Measure flow through open channels, partially full pipes and surcharged pipes without a flume or weir. Ideal for wastewater stormwater, effluent, industrial wastewater, and irrigation water.

The AVFM 6.1 uses a submerged ultrasonic sensor to continuously measure both Velocity and Level in the channel. The sensor resists fouling, corrosion and abrasion. The flow meter can be configured with the standard submerged velocity-level sensor, or with submerged velocity plus a separate non-contacting ultrasonic level sensor, for highly aerated fluids or those with high concentration of suspended solids.

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. Flow rate, volume, run hours, and diagnostic information available through the optional Modbus® RTU serial communications.

Easy to Install and Use

The AVFM 6.1 Area-Velocity Flow Meter measures both Level and Velocity to calculate flow in an open channel or pipe. Configuration is simple: enter the pipe diameter or channel dimensions and the AVFM 6.1 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.

Custom Channel Shapes

Configure the AVFM 6.1 for installation in irregular or compound channel shapes by entering the channel width at multiple level points through a simple menu. Channels of virtually any shape can be monitored with your choice of measurement units.

Onboard 26 Million Point Data Logger

The AVFM 6.1 will store time and date-stamped flow values at 10 second to 60 minute intervals. Daily flow reports are automatically created where total, minimum, maximum and average flow rates are displayed on the LCD display. Transfer log files and daily flow reports to any USB flash drive just by connecting to the logger's USB output. Windows software is included to display log files in graph and table formats, change measurement units and generate flow reports. Or, download data as .csv file format for import directly to Microsoft Excel.

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