"We have been using Greyline products at
Thurston County, Washington for approximately seven years. We use
both the Stingray portable flow meters and the permanent Area
Velocity Flow Meter (AVFM II) in multiple stormwater applications." Read more...
For Open Channels and Pipes No Flume or Weir Required
Velocity + Level to Calculate Flow
Works in partially filled and
Measures Forward and
Isolated 4-20mA Outputs (Flow, Level and Velocity)
Monitor flow through open
channels, partially full sewer pipes and surcharged pipes
without a flume or weir. Ideal for stormwater, combined
effluent, raw sewage, irrigation water and streams. Calibration is simple: enter the pipe
diameter or channel shape and the AVFM 5.0 computes the flow volume and
displays the flow rate. Measure forward
and reverse flow and calibrate to channels of
The AVFM 5.0 uses a submerged ultrasonic
sensor to measure both Velocity and Level in the channel.
The sensor is completely sealed with no orifices or
ports. It mounts inside a pipe or at the bottom of a channel. More info...
The AVFM 5.0 is recommended for pipe diameters greater than 6" (150
mm). Maximum pipe diameter or channel width should not exceed 10 ft (3 m)
unless flow velocity is evenly distributed across the channel width. Avoid
sensor mounting locations where sediment builds up and locations where
there is an elevation drop or bend immediately upstream from the sensor.
Maximum pipe or channel slope should not exceed 3%.
AVFM 5.0 measures flow velocity from 0.1 to 20 ft/sec (0.03 to 6.2 m/sec)
and reverse flow up to 5 ft/sec (1.5 m/sec). Contact
Greyline Instruments for specific recommendations in your application.
AVFM 5.0 Installation
See the AVFM 5.0 Area-Velocity Flow
Meter in action measuring water flow in a 32-inch corrugated
Pipe Band Sensor Mounting for Area-Velocity Flowmeters
Do it the easy way - use a
stainless steel pipe band for Area-Velocity Flow Meter sensor
mounting. You can install the sensor and tie wrap the cable in
place before you enter the manhole. Then insert the pipe band
into the manhole inlet pipe and tighten the scissor-jack to
expand the band for a friction fit inside the pipe.