Greyline Mantaray Portable Area-Velocity Flow Meter

Measures Flow in Open Channels with a Hydrodynamic Ultrasonic Sensor

 The Mantaray Portable Area-Velocity Flow Meter measures flow in open channels, partially filled and surcharged pipes using an ultraosnic sensor. The unit displays and datalogs flow rate and total flow and connects to samplers, SCADA and telemetry systems. 

Stingray Portable Level Velocity LoggerCalibration is simple: enter the pipe diameter or channle dimensions and the MantaRay automatically computes and displayes the flow rate and total on its backlit LCD display. Mount the sensor at the bottom of the pipe or channel and hang the IP67 electronics case above the high water level. 

The Mantaray uses a submerged ultrasonic sensor to continuously measure flow or reverse flow in open channels, partially filled or surcharged pipes. The sensor is a completely sealed ultrasonic unit with no orifices or ports. It is hydronamically shaped and designed to shed deposits and stringers for reliable operation in sewage, stormwater and stream flow applications. 

The QZ02L sensor mounts inside the pipe or at the bottome of an open channel. No special compounds, tools or hardware are required. A stainless steel mounting bracket is included and a size of range optional pipe bands are available for sensor installation in manholes. 


Mantaray Features

  • Measures flow in partially filled pipes and open channels
  • No flume or weir required
  • 4-20mA and Relay outputs for connection to Samplers and SCADA
  • Powered with built-in rechargeable NiMH batteries
  • 2 million point data logger with USB output to Flash drives
  • Backlit LCD display for flow rate, totalizer and menu system

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Mantaray Sales Catalogue Mantaray User Guide

MicroFlow liquid flow velocity case studies


  • Sewer Flow Monitoring and Reporting
  • Industrial Effluent
  • Stormwater Monitoring
  • Natural Streams
  • Irrigation Water
Product Photos 

Mantaray installation photo

Mantaray installation photo