Flow transmitter - 4:20 mA output : AV-FLOW TRANSMITTER | MAINSTREAM INSTRUMENTS

The AV-FLOW TRANSMITTER is a high-performance flow transmitter designed for use as a system component in open channel and part-filled pipe applications. It uses the area-velocity method with an immersed ultrasonic velocity probe and level input to determine flow rate. The transmitter is intended for installations requiring reliable hydraulic measurement, simple integration, and PC-based configuration and diagnostics.

Advantages

• Area-velocity measurement for open channels and part-filled pipes
• Quick installation without the need for weirs or flumes
• Velocity measurement from 10 mm/s up to 5 m/s
• High sensitivity ultrasonic sensing suitable for relatively clean water applications
• Real-time signal processing to reduce power consumption
• Smart power saving mode that adapts measurement time to flow and signal quality conditions
• Signal quality monitoring to confirm measurement integrity
• Automatic recording of velocity signals and histograms for performance monitoring
• One configurable 4:20 mA output for system integration
• Up to 500 m distance from system unit to velocity and level sensors

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
• Power supply: external 12 V and 24 V supplies
• Power monitoring: supply voltages viewable through the user interface
• Local communications: RS232 and USB compatible interface with automatic baud rate detection
• Remote communications: optional external SDI or GPRS device
• Software: Mainstream Communicator UI software for configuration, diagnostics, real-time display, and data export
• Analog output: one configurable 4:20 mA output
• Velocity sensor protection: IP68
• System enclosure: IP67 with encapsulated electronics to IP68
• System unit dimensions: 220 x 120 x 80 mm
• System unit weight: 1.65 kg

Typical Applications

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

Why choose AV-FLOW TRANSMITTER

The AV-FLOW TRANSMITTER is a strong choice for users who need a compact and reliable flow transmission component for hydraulic monitoring systems. Its combination of immersed ultrasonic velocity sensing, level-based area calculation, signal quality validation, and straightforward 4:20 mA integration makes it well suited for water and wastewater applications where dependable flow data and simple commissioning are required.