Rate of Flow Indicator

Open Channel Flow measurement (based on RF Capacitance)

The Rate of Open Channel Flow indicator is a microprocessor-based instrument that measures the flow of liquid in open channels. The instrument can be configured to measure the level or the flow rate and provides a 4-20mA output corresponding to the selected parameter


  • Indication of flow rate and level in % and in engineering units
  • 4-20 mA output corresponding to flow or level
  • Built-in Diagnostics.
  • 4 Key keyboard for easy configuration
  • Remote Monitoring
  • Available with Differential head Indicator in common housing
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Application Examples

  • Measuring Rate of flow in a  rectangular weir

    Measuring Rate of flow in a rectangular weir

  • Monitoring of filtration plant using RoF Indicator

    Monitoring of filtration plant using RoF Indicator

  • Technical Specifications
  • Applications
  • Operating Principle
  • Literature
  • Mains supply: 230/110 Vac, 50 Hz
  • Output: 4-20 mA, Relay, Local Display
  • Accuracy: ± 2% of probe length
  • Ambient temperature: -20 to 60° C
  • Process temperature: up to 80° C
  • Housing: Cast Aluminium
  • Protection: IP 65
  • Effluent Treatment Plant
  • Water Treatment Plant
  • Irrigation Channels
  • Dams
  • Inlet/Outlet of Filter Beds

The complete measuring system consists of:

The Probe:  The Probe is the active element of the system that goes in the stilling  pipe / channel from top and is in contact with the fluid whose flow rate is to be indicated.

RoF Indicator : The indicator receives voltage signal corresponding to the level/height of  fluid in the channel/pipe and converts it into digital data. The RoF is calculated using the formula:

Q = K*L

Here, Q is Rate of Flow in CuM / Hr, L is Level in Meters, K & n are constants; depending on the hydraulic measuring device.

The flow rate is displayed on the LED display. The constants, display selection & alarm can be entered through the keyboard.