Portable area-velocity flowmeter - data logger, battery powered: Portable AV-Flowmeter | MAINSTREAM INSTRUMENTS

Portable area-velocity flowmeter with ultrasonic velocity sensor, level input, onboard data logger, battery power, CSV export, and software for wastewater, river, sewer, and channel flow monitoring.

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The Mainstream Portable AV-Flowmeter is a portable area-velocity flow measurement system designed for short-term campaigns and extended field studies. It combines an immersed ultrasonic velocity probe with level measurement to calculate flow rate in open channels and partially filled pipes. The system integrates a high-capacity non-volatile data logger, internal rechargeable battery, and PC software for commissioning, diagnostics, and data retrieval.

Advantages

Portable flow monitoring solution for temporary or extended field deployment
Area-velocity measurement method for continuous or time-sampled flow measurement
No need for weirs or flumes, enabling quick installation
Flow velocity measurement from 10 mm/s to 5 m/s
High sensitivity suitable even for relatively clean water applications
Integrated 4 MB flash data logger with long-term non-volatile retention
Smart power saving mode that adapts measurement time to flow and signal quality conditions
Exchangeable internal 12 V rechargeable battery for autonomous operation
Signal quality monitoring and automatic recording of velocity histograms for measurement validation
PC software interface simplifying setup, diagnostics, visualization, and data export

Main Features

Measurement principle: area-velocity flow measurement using immersed ultrasonic velocity sensing and level measurement
Velocity method: phase coherence time delay measurement
Velocity range: from -5 m/s to -10 mm/s and from 10 mm/s to 5 m/s
Velocity resolution: better than 1 mm/s
Level input: compatible with any 4:20 mA current loop level sensor
Derived values: level, area, flow rate, and forward/reverse/total flow quantities
Data logger capacity: more than one year at one-minute intervals
Recording interval: configurable from 15 seconds to 1 hour
Retrieved data format: spreadsheet-compatible CSV files
Internal battery: 12 V, 7.5 Ah rechargeable battery
Communications: RS232 and USB compatible interface with automatic baud rate detection
Remote communication: optional external SDI or GPRS device
Switch outputs: two opto-isolated switches for alarms, controls, or pulse outputs
Velocity sensor protection: IP68
System enclosure: IP67, with encapsulated electronics capable of submerged operation with lid open
Maximum distance: up to 500 m between system unit and sensors

Typical Applications

Effluent monitoring
Wastewater treatment flow studies
Industrial flow measurement
Irrigation channels and canals
River and stream flow measurement
Water distribution monitoring
Sewer flow measurement including inflow and infiltration and CSO monitoring
Portable and fixed-site flow measurement with weirs and flumes

Why choose Mainstream Portable AV-Flowmeter

The Mainstream Portable AV-Flowmeter is designed for users who need reliable field flow measurements without complex civil works or permanent installations. Its combination of portable deployment, advanced ultrasonic velocity sensing, integrated logging, and battery-powered operation makes it well suited for environmental monitoring, wastewater studies, and temporary hydraulic investigations where flexibility and data integrity are critical.