Greyline Instruments AVFM 6.1 Area Velocity Flow Meter
Starting at $3,275.00

Not in stock. Usually ships in 2-3 weeks [?]

Need Help? Call a Flow Engineer 1-800-884-4967

We're open Mo-Fr 8:30am to 5:00pm ET


  • No flume or weir required
  • Flow in open channels and partially filled pipes
  • Measures velocity + level to calculate flow
    • 0.1 to 20 ft/sec & reverse flow to -5 ft/sec velocity
    • 1 inch to 15 feet level range
  • Works in partially filled and surcharged pipes
  • Measures forward and reverse flow
  • 3 Isolated 4-20mA outputs (Flow, Level and Velocity)

The Greyline Instruments AVFM 6.1 Area Velocity Flow Meter Measures flow through open channels, partially full pipes and surcharged pipes without a flume or weir. It is 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.


Greyline Instruments VXC Sensor Cable
Submersible, tri-coaxial cable available in lengths up to 500 feet


Greyline Instruments QZ02L-DP Velocity Sensor
Submersible ultrasonic sensor continuously measures stream velocity in the channel
In Stock
Greyline Instruments PZ15-LP Level Sensor
Low profile, non-contacting ultrasonic level sensor ideal for confined spaces and small flumes
Greyline Instruments PZ15 Level Sensor
Non-contacting ultrasonic level sensor is small enough for very small flumes and powerful enough for really large applications.


Please consider these optional accessories.

Greyline Instruments VD Series Pipe Dams
Maintains low flow water level at 1” or higher as required for ultrasonic level measurement.
Greyline Instruments VSJ Series Mounting Bands
Provides easy mounting for submersible sensors inside of round pipes
Greyline Instruments JB2X Sensor Cable Junction Box
NEMA4X/IP66 polycarbonate junction box for extending sensor cable lengths
Greyline Instruments QZ02L-SS-SD Velocity & Level Sensor
316 stainless steel submersible ultrasonic sensor, continuously measures both velocity and level in the channel
Greyline Instruments CHS Spare Electronics Set
Spare set electronics with mounting chassis (standard features)