Greyline Instruments AVFM-6.1 Data sheet

Area-Velocity Flow Meter

Measure Flow in Open Channels and Partially-Filled Pipes

No Flume or Weir Required

Area-Velocity

Flow Meter

Model AVFM 6.1

Display, Transmit and Totalize

Flow in Open Channels and

Partially-Filled Pipes

No Flume or Weir Required

Three 4-20mA Outputs

Two Control Relays

Measures Reverse Flow

Modbus® RTU Optional

Area-Velocity Flow Meter

Submersible Ultrasonic Sensor

Measures Velocity and Level to Monitor Flow

with a single Ultrasonic Sensor

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.

Ultrasonic Flow Monitor for

Partially Filled Pipes & Open Channels

Easy to 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

Submerged Sensor
Measures Level And Velocity

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.

Best possible accuracy will result when the water is not highly turbulent and where velocity is evenly distributed across the
channel. The channel should not have drops or direction changes immediately upstream of the sensor mounting location.
Pipe or channel slope should not exceed 3%. See installation manual for specific installation recommendations.

The AVFM 6.1 can measure forward flow velocity up to 20 ft/sec (6 m/sec) and reverse flow up to 5 ft/sec (1.5 m/sec). The
electronics and software sample and average flow rates continuously to provide stable readings. The submerged
velocity/level sensor will measure flow in partially full and surcharged pipes with pressure up to 10 psi. No special set-up
or adjustment is required. Minimum recommended pipe diameter is 6” (150 mm).

displays flow volume.

The ultrasonic sensor mounts inside the
pipe or on the bottom of a channel with a

Alternate Sensor Configurations

Alternate sensor models are available for special applications: a
separate non-contacting ultrasonic level sensor with a submerged
velocity sensor. Sensor cable can be extended up to 500 ft (150 m).
Use this configuration for pipes or channels with high concentration of
air or suspended solids.

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.

Standard 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.

VELOCITY

LOW PROFILE

NON-CONTACTING

ULTRASONIC

SENSOR

LEVEL

FLOW