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Greyline Instruments, Inc.

Massena, NY 13662   map
Contact Company: 888-473-9546
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Area - Velocity Flow Meter

Item #: AVFM 5.0

For Open Channels and Pipes - No Flume or Weir Required

Display, Transmit and Totalize Flow in Open Channels and Pipes

Simple 5-key Calibration
Three 4-20 mA Outputs
Two Control Relays
Measures Reverse Flow
Works in Irregular Channel Shapes

Measures Velocity + Level with an Ultrasonic Sensor to Monitor Flow with an Ultrasonic Sensor

Area - Velocity Flow Meter

Monitor flow through open channels, partially full sewer pipes and surcharged pipes without a flume or weir. Ideal for municipal stormwater, combined effluent, raw sewage and irrigation water.

Submersible Ultrasonic Sensor

The AVFM 5.0 uses a submerged ultrasonic sensor to continuously measure both Velocity and Level in the channel. The sensor resists fouling, corrosion and abrasion. The flowmeter can be configured with the standard submerged velocity-level sensor, or with submerged velocity plus a separate non-contacting ultrasonic level sensor.

View flowrate and total flow on the large backlit LCD display and connect to external devices with three 4-20 mA outputs and two control relays.

New Open Channel Flow Monitor
Measures Velocity + Level to calculate Flow

The AVFM 5.0 Area -Velocity Flow Meter includes a submerged ultrasonic sensor that is installed at the bottom of an open pipe or channel. Exposed materials are plastic so the sensor resists fouling and corrosion. It has no moving parts and no orifices, ports or electrodes.

The AVFM 5.0 displays and totalizes flow. It includes three 4-20 mA outputs (Flow, Level and Velocity), plus two control relays for level alarms or flow proportionate pulse output for samplers and chlorinators. It is easy to calibrate with the built-in keypad and menu system. A built-in 2-million point data logger with USB output is optional. Intrinsic Safety Barriers for sensor and cable installation in hazardous rated channels is also optional.
Area - Velocity Flow Meter

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Item #: AVFM 5.0
Item #:AVFM 5.0
Item Name:Area - Velocity Flow Meter
Channel Types:Round pipe, Rectangular, trapezoid, egg or custom shapes
Electronics Enclosure:Watertight and dust tight NEMA4X (IP 66) polycarbonate with clear, shatterproof cover
Accuracy:Level: ±0.25% of Range. Velocity: ±2% of Reading. Repeatability and Linearity: ±0.1%
Display:White, Backlit 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
Input Voltage:100 to 240 VAC
Frequency:50 to 60 Hz
Maximum Power:5.28 W
Outputs:3 Isolated 4-20 mA, 1000 ohm, (Flow, Level and Velocity) or 0-5 VDC 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
Electrical Surge Protection:Sensor, 4-20 mA outputs and AC power input
Electronics Operating Temperature:-5 to 140 ºF
-20 to 60 ºC
Approximate Shipping Weight:10 lbs
4.5 kg
Applications Support
Take advantage of Greyline's applications experience. Phone 1-888-473-9546 for advice and information on applications, installation or service for Greyline instruments.
  • Measure flow in pipes and open channels of any shape
  • Ideal where flumes or weirs are difficult to install
  • Works with water level from 1" (25.4 mm) to 15 ft (4.5 m)
  • Auto-detects field installation of options including data logger and control relays

How to Order
Contact a Greyline sales representative in your area or phone one of our sales engineers. Describe your requirements and receive our prompt quotation.
No Risk Appraisal
The Greyline AVFM 5.0 Area - Velocity Flow Meter must meet your requirements. Discuss your application with a Greyline representative to arrange a 30-day trial.
Data Logging:Programmable 2-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
Sensor Cable (Optional):50 ft. (15 m) or 100 ft. (30 m) submersible, continuous from Sensor - or splice up to total of 500 ft (150 m) length
Sensor Cable Junction Box:Watertight NEMA4 steel with connection terminal strip
Input Voltage (Optional):9 to 32 VDC
Minimum Power (Optional):2.5 W
Maximum Power (Optional):6.5 W
Enclosure Heater:Thermostatically controlled - recommended for temperatures below 32ºF (0ºC)
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 6" to 72" (150 to 1800 mm) diameter
QZ02L Sensor
Velocity Measurement Range:0.1 to 20 ft/sec (0.03 to 6.2 m/sec) and reverse flow to -5 ft/sec (-1.5 m/sec)
Level Measurement Range:Minimum Head: 1 in (25.4 mm). Maximum Head: 15 ft. (4.57 m)
Operating Temperature:5 to 150 ºF
-15 to 65 ºC
Exposed Materials:PVC, Epoxy Resin, Polyurethane
Sensor Cable:25 ft. (7.6 m) submersible polyurethane jacket, shielded, 3-coaxial
Sensor Mounting:Includes MB-QZ stainless steel mounting bracket
Temperature Compensation:Automatic, Continuous
Recommended for
  • Sewer Flow Monitoring and Reporting
  • Industrial Effluent
  • Stormwater Monitoring
  • Natural Streams
  • Irrigation Water

The Greyline Guarantee
Quality of Materials and Workmanship - Each instrument manufactured by Greyline is warranted against defects in materials and workmanship for a period of one year from date of purchase. Refer to our limited warranty included with each product.
Ultrasonic Flow Monitor for Partially Filled Pipes & Open Channels
Easy to Use

The AVFM 5.0 Area - Velocity Flow Meter measures both Level and Velocity to calculate flow in an open channel or pipe. Calibration is simple: enter the pipe diameter or channel dimensions and the AVFM 5.0 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.

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%.

The AVFM 5.0 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).

Alternate Sensor Configurations

The standard sensor measures both velocity and level with a single submerged probe. It is installed in the pipe or channel floor with the stainless steel mounting bracket (supplied), or mounted with an optional stainless steel band for round pipes. 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).

Custom Channel Shapes

Calibrate the AVFM 5.0 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.

Optional 2-Million Point Data Logger

Choose the built-in data logger option if you want the AVFM 5.0 to 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 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. Export data to graphic or text file formats, or directly to Microsoft Excel.

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