Compact fixed area-velocity flowmeter - 4:20 mA output : Compact Fixed AV-Flowmeter | MAINSTREAM INSTRUMENTS

Compact fixed area-velocity flowmeter with ultrasonic velocity sensor, 4:20 mA output, onboard data logger, and industrial communications for wastewater, sewer, channel, and river flow monitoring.

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The Compact Fixed AV-Flowmeter is a high-performance fixed installation area-velocity flowmeter designed for basic open channel and part-filled pipe applications. It combines an immersed ultrasonic velocity sensor with level measurement to calculate flow rate continuously or by time sample. The system is intended for fixed monitoring points requiring reliable hydraulic measurement, integrated data logging, and straightforward industrial integration.

Advantages

Fixed-installation design for permanent monitoring locations
Area-velocity measurement method for open channels and part-filled pipes
No need for weirs or flumes, simplifying installation
Velocity measurement from 10 mm/s to 5 m/s for low to moderate flow conditions
High sensitivity ultrasonic sensing suitable for relatively clean water applications
Integrated 4 MB flash data logger with long-term retention and rapid retrieval
Smart power saving mode that adapts measurement time to signal and flow conditions
Signal quality monitoring with automatic recording of velocity signals and histograms
One configurable 4:20 mA output for simple process integration
Compact enclosure for constrained installation environments

Main Features

Measurement principle: area-velocity flow measurement
Velocity method: phase coherence time delay measurement
Velocity sensor: submerged ultrasonic sensor with integrated electronics
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 measurements: area, flow rate, and forward, reverse, and total flow quantities
Data logger: 4 MB flash memory, configurable recording from 15 seconds to 1 hour
Data export: spreadsheet-compatible CSV files
Local communications: RS232 and USB compatible interface with automatic baud rate detection
Remote communications: optional external SDI or GPRS device
Analog output: one configurable 4:20 mA output
Switch outputs: two opto-isolated outputs rated at 60 V ac/dc and 200 mA maximum current
Power supply: external 12 V and 24 V supplies
Velocity sensor protection: IP68
System enclosure: IP67 with encapsulated electronics to IP68
System unit dimensions: 220 x 120 x 80 mm
System unit weight: 1.9 kg

Typical Applications

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

Why choose Compact Fixed AV-Flowmeter

The Compact Fixed AV-Flowmeter is a practical solution for users who need reliable permanent flow monitoring without the extended feature set of more advanced systems. Its combination of immersed ultrasonic velocity sensing, level-based area calculation, compact hardware, and integrated data logging makes it well suited for standard hydraulic monitoring points where durability, measurement integrity, and straightforward integration are essential.