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
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.
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
The 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
Pipe Band Sensor Mounting for Area-Velocity Flowmeters
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.
data logging model... Check out the
portable, battery-powered Stingray
Level-Velocity Logger for flow surveys and I&I
studies. It runs for up to 4 years on a set of standard
D-Cell Alkaline batteries.