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AVFM 6.1

Greyline AVFM 6.1 Area Velocity Flow Meter

The Greyline AVFM 6.1 Area-Velocity Flow Meter uses a submerged ultrasonic sensor measuring both level and velocity to calculate flow in an open channel or pipe. Measure flow through partially filled pipes, channels, canals, and turnouts without a flume or weir. Ideal for wastewater, stormwater, effluent, industrial wastewater, and irrigation water. 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.

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  • No flume or weir required – submersible ultrasonic sensor measures velocity and level simultaneously to calculate flow. No moving parts to wear, foul, or clog.
  • The built-in 5-button keypad, intuitive menu, and large backlit LCD display make the Greyline AVFM 6.1 the most operator-friendly area velocity flow meter on the market.
  • Fast, simple, installation and set-up.
  • Improved performance in a wider range of operating conditions.
  • At a glance, view flow rate, velocity, level, totalizer, relay status, and important diagnostic information on the LCD display.
  • Three isolated 4-20 mA outputs for flow rate, velocity, and level, and two relay outputs for pulse output or alarm.
  • 6.5 million point data logger for greater flexibility of data monitoring, control, and reporting.
  • Min, Max, and Total Flow data from the last 365 days is available on the LCD display, or download directly to a USB for easy reporting.
  • Monitors flow rate, volume total, run hours, and diagnostic information through only two wires with the optional Modbus RTU serial communication output.
General Specifications
Spec name: Description:
Channel Types Round pipe, rectangular, trapezoid, egg, or custom shapes
Electronics Enclosure NEMA4X (IP 66) polycarbonate with clear, shatterproof cover
Accuracy Level: ±0.25% of reading or ±0.08 in, whichever is greater. Repeatability & Linearity 0.1%.
Velocity: ±2% of reading or 0.01 m/s (±0.04 ft/s), whichever is greater. Requires solids or bubbles minimum size of 100 microns, minimum concentration 75 ppm. Repeatability & Linearity 0.5%
Display White, back-lit matrix - displays flow rate, totalizer, relay states, operating mode, and calibration menu
Programming Built-in 5-key calibrator with English, French, or Spanish language selection
Power Input 100-240 V AC 50/60 Hz, 10 VA maximum.
Optional: 9-32 V DC, 10 W maximum
Outputs 3 Isolated 4-20 mA, 1000 ohm, (Flow, Level, and Velocity) or 0-5 V DC by menu selection
Control Relays 2 Relays, form 'C' dry contacts rated 5 amp SPDT; programmable for flow proportional pulse (sampler/totalizer), flow, and/or level alarm
Data Logging Programmable 26 million point data capacity, time and date stamped plus formatted flow reports including Total, Average, Minimum, Maximum, and times of occurrence. Includes USB output to Flash Drives and Windows software
Operating Temperature (Electronics): -20 °C to 60 °C (-5 °F to 140 °F)
Approximate Shipping Weight 4.5 kg (10 lbs)

QZ02L Sensor Specifications
Spec name: Description:
Velocity Measurement Range 0.03 m/s to 6.2 m/s (0.1 ft/s to 20 ft/s) and reverse flow to -1.5 m/s (-5 ft/s) in fluids containing bubbles or solids with a minimum size of 100 microns and a minimum concentration of 75 ppm to act as acoustic reflectors
Level Measurement Range Minimum Head: 25.4 mm (1 in). Maximum Head: 4.57 m (15 ft)
Operating Temperature -15 °C to 80 °C (5 °F to 175 °F)
Exposed Materials 316 stainless steel, epoxy resin, polyurethane
Sensor Cable 7.6 m (25 ft) submersible polyurethane jacket, shielded, 3-coaxial
Sensor Mounting Includes MB-QZ stainless steel mounting bracket
Temperature Compensation Automatic, continuous
Options
Options: Description:
Industrial Automation Protocols Modbus RTU via RS-485
Sensor Cable 15 m (50 ft) or 30 m (100 ft) submersible, continuous from Sensor - or splice up to a total of 150 m (500 ft) length
Sensor Cable Junction Box NEMA4 polycarbonate with connection terminal strip
Enclosure Heater Thermostatically controlled to -40 °C (-40 °F); recommended for temperatures below 0 °C (32 °F)
Intrinsic Safety Barriers For Sensor mounting in Class I,II,III, Div. I,II, Groups C,D,E,F,G hazardous locations
Sensors Separate non-contacting ultrasonic level sensor and submerged velocity sensor
Sensor Mounting Bands Stainless steel sensor mounting bands for pipes 150 mm to 1800 mm (6 in to 72 in) diameter
AVFM 6.1
Product Brochure
Greyline Logger
Software Brochure
AVFM 6.1
Datasheet
AVFM 6.1
Order Form
AVFM 6.1
Installation & Instruction Manual
AVFM 6.1
Engineering Specifications
Greyline Logger
Greyline Logger Software
Irrigation water flow measurement with Greyline AVFM area-velocity flow meter
Case Study: Irrigation water flow measurement at the United Irrigation District.
  • CE
  • CSA
  • UL
  • EN 61010-1

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